diff --git a/Android.bp b/Android.bp
index f8c6a4b..6c04504 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1,8 +1,143 @@
-subdirs = [
-    "applypatch",
-    "bootloader_message",
-    "edify",
-    "otafault",
-    "otautil",
-    "uncrypt",
-]
+// Copyright (C) 2018 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+cc_defaults {
+    name: "recovery_defaults",
+
+    cflags: [
+        "-Wall",
+        "-Werror",
+    ],
+}
+
+// Generic device that uses ScreenRecoveryUI.
+cc_library_static {
+    name: "librecovery_ui_default",
+
+    defaults: [
+        "recovery_defaults",
+    ],
+
+    srcs: [
+        "default_device.cpp",
+    ],
+}
+
+// The default wear device that uses WearRecoveryUI.
+cc_library_static {
+    name: "librecovery_ui_wear",
+
+    defaults: [
+        "recovery_defaults",
+    ],
+
+    srcs: [
+        "wear_device.cpp",
+    ],
+}
+
+// The default VR device that uses VrRecoveryUI.
+cc_library_static {
+    name: "librecovery_ui_vr",
+
+    defaults: [
+        "recovery_defaults",
+    ],
+
+    srcs: [
+        "vr_device.cpp",
+    ],
+}
+
+cc_library_static {
+    name: "libmounts",
+
+    defaults: [
+        "recovery_defaults",
+    ],
+
+    srcs: [
+        "mounts.cpp",
+    ],
+
+    static_libs: [
+        "libbase",
+    ],
+}
+
+cc_library_static {
+    name: "libverifier",
+
+    defaults: [
+        "recovery_defaults",
+    ],
+
+    srcs: [
+        "asn1_decoder.cpp",
+        "verifier.cpp",
+    ],
+
+    static_libs: [
+        "libbase",
+        "libcrypto",
+        "libcrypto_utils",
+        "libotautil",
+    ],
+}
+
+// The dynamic executable that runs after /data mounts.
+cc_binary {
+    name: "recovery-persist",
+
+    defaults: [
+        "recovery_defaults",
+    ],
+
+    srcs: [
+        "recovery-persist.cpp",
+        "rotate_logs.cpp",
+    ],
+
+    shared_libs: [
+        "libbase",
+        "liblog",
+    ],
+
+    init_rc: [
+        "recovery-persist.rc",
+    ],
+}
+
+// The dynamic executable that runs at init.
+cc_binary {
+    name: "recovery-refresh",
+
+    defaults: [
+        "recovery_defaults",
+    ],
+
+    srcs: [
+        "recovery-refresh.cpp",
+        "rotate_logs.cpp",
+    ],
+
+    shared_libs: [
+        "libbase",
+        "liblog",
+    ],
+
+    init_rc: [
+        "recovery-refresh.rc",
+    ],
+}
diff --git a/Android.mk b/Android.mk
index 7e0ad12..ed09b49 100644
--- a/Android.mk
+++ b/Android.mk
@@ -18,34 +18,18 @@
 RECOVERY_API_VERSION := 3
 RECOVERY_FSTAB_VERSION := 2
 
-# libfusesideload (static library)
-# ===============================
-include $(CLEAR_VARS)
-LOCAL_SRC_FILES := fuse_sideload.cpp
-LOCAL_CFLAGS := -Wall -Werror
-LOCAL_CFLAGS += -D_XOPEN_SOURCE -D_GNU_SOURCE
-LOCAL_MODULE := libfusesideload
-LOCAL_STATIC_LIBRARIES := \
-    libcrypto \
-    libbase
-include $(BUILD_STATIC_LIBRARY)
-
-# libmounts (static library)
-# ===============================
-include $(CLEAR_VARS)
-LOCAL_SRC_FILES := mounts.cpp
-LOCAL_CFLAGS := \
-    -Wall \
-    -Werror
-LOCAL_MODULE := libmounts
-LOCAL_STATIC_LIBRARIES := libbase
-include $(BUILD_STATIC_LIBRARY)
+# TARGET_RECOVERY_UI_LIB should be one of librecovery_ui_{default,wear,vr} or a device-specific
+# module that defines make_device() and the exact RecoveryUI class for the target. It defaults to
+# librecovery_ui_default, which uses ScreenRecoveryUI.
+TARGET_RECOVERY_UI_LIB ?= librecovery_ui_default
 
 # librecovery (static library)
 # ===============================
 include $(CLEAR_VARS)
+
 LOCAL_SRC_FILES := \
     install.cpp
+
 LOCAL_CFLAGS := -Wall -Werror
 LOCAL_CFLAGS += -DRECOVERY_API_VERSION=$(RECOVERY_API_VERSION)
 
@@ -54,6 +38,7 @@
 endif
 
 LOCAL_MODULE := librecovery
+
 LOCAL_STATIC_LIBRARIES := \
     libminui \
     libotautil \
@@ -65,36 +50,22 @@
 
 include $(BUILD_STATIC_LIBRARY)
 
-# recovery (static executable)
+# librecovery_ui (static library)
 # ===============================
 include $(CLEAR_VARS)
-
 LOCAL_SRC_FILES := \
-    adb_install.cpp \
-    device.cpp \
-    fuse_sdcard_provider.cpp \
-    recovery.cpp \
-    roots.cpp \
-    rotate_logs.cpp \
     screen_ui.cpp \
     ui.cpp \
     vr_ui.cpp \
-    wear_ui.cpp \
+    wear_ui.cpp
 
-LOCAL_MODULE := recovery
+LOCAL_CFLAGS := -Wall -Werror
 
-LOCAL_FORCE_STATIC_EXECUTABLE := true
+LOCAL_MODULE := librecovery_ui
 
-LOCAL_REQUIRED_MODULES := e2fsdroid_static mke2fs_static mke2fs.conf
-
-ifeq ($(TARGET_USERIMAGES_USE_F2FS),true)
-ifeq ($(HOST_OS),linux)
-LOCAL_REQUIRED_MODULES += sload.f2fs mkfs.f2fs
-endif
-endif
-
-LOCAL_CFLAGS += -DRECOVERY_API_VERSION=$(RECOVERY_API_VERSION)
-LOCAL_CFLAGS += -Wall -Werror
+LOCAL_STATIC_LIBRARIES := \
+    libminui \
+    libbase
 
 ifneq ($(TARGET_RECOVERY_UI_MARGIN_HEIGHT),)
 LOCAL_CFLAGS += -DRECOVERY_UI_MARGIN_HEIGHT=$(TARGET_RECOVERY_UI_MARGIN_HEIGHT)
@@ -144,6 +115,35 @@
 LOCAL_CFLAGS += -DRECOVERY_UI_VR_STEREO_OFFSET=0
 endif
 
+include $(BUILD_STATIC_LIBRARY)
+
+# recovery (static executable)
+# ===============================
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES := \
+    adb_install.cpp \
+    device.cpp \
+    fuse_sdcard_provider.cpp \
+    recovery.cpp \
+    roots.cpp \
+    rotate_logs.cpp \
+
+LOCAL_MODULE := recovery
+
+LOCAL_FORCE_STATIC_EXECUTABLE := true
+
+LOCAL_REQUIRED_MODULES := e2fsdroid_static mke2fs_static mke2fs.conf
+
+ifeq ($(TARGET_USERIMAGES_USE_F2FS),true)
+ifeq ($(HOST_OS),linux)
+LOCAL_REQUIRED_MODULES += sload.f2fs mkfs.f2fs
+endif
+endif
+
+LOCAL_CFLAGS += -DRECOVERY_API_VERSION=$(RECOVERY_API_VERSION)
+LOCAL_CFLAGS += -Wall -Werror
+
 LOCAL_C_INCLUDES += \
     system/vold \
 
@@ -162,6 +162,7 @@
 
 LOCAL_STATIC_LIBRARIES += \
     librecovery \
+    $(TARGET_RECOVERY_UI_LIB) \
     libverifier \
     libbootloader_message \
     libfs_mgr \
@@ -173,6 +174,7 @@
     libminadbd \
     libasyncio \
     libfusesideload \
+    librecovery_ui \
     libminui \
     libpng \
     libcrypto_utils \
@@ -196,84 +198,16 @@
 
 LOCAL_MODULE_PATH := $(TARGET_RECOVERY_ROOT_OUT)/sbin
 
-ifeq ($(TARGET_RECOVERY_UI_LIB),)
-  LOCAL_SRC_FILES += default_device.cpp
-else
-  LOCAL_STATIC_LIBRARIES += $(TARGET_RECOVERY_UI_LIB)
-endif
-
 ifeq ($(BOARD_CACHEIMAGE_PARTITION_SIZE),)
 LOCAL_REQUIRED_MODULES += recovery-persist recovery-refresh
 endif
 
 include $(BUILD_EXECUTABLE)
 
-# recovery-persist (system partition dynamic executable run after /data mounts)
-# ===============================
-include $(CLEAR_VARS)
-LOCAL_SRC_FILES := \
-    recovery-persist.cpp \
-    rotate_logs.cpp
-LOCAL_MODULE := recovery-persist
-LOCAL_SHARED_LIBRARIES := liblog libbase
-LOCAL_CFLAGS := -Wall -Werror
-LOCAL_INIT_RC := recovery-persist.rc
-include $(BUILD_EXECUTABLE)
-
-# recovery-refresh (system partition dynamic executable run at init)
-# ===============================
-include $(CLEAR_VARS)
-LOCAL_SRC_FILES := \
-    recovery-refresh.cpp \
-    rotate_logs.cpp
-LOCAL_MODULE := recovery-refresh
-LOCAL_SHARED_LIBRARIES := liblog libbase
-LOCAL_CFLAGS := -Wall -Werror
-LOCAL_INIT_RC := recovery-refresh.rc
-include $(BUILD_EXECUTABLE)
-
-# libverifier (static library)
-# ===============================
-include $(CLEAR_VARS)
-LOCAL_MODULE := libverifier
-LOCAL_SRC_FILES := \
-    asn1_decoder.cpp \
-    verifier.cpp
-LOCAL_STATIC_LIBRARIES := \
-    libotautil \
-    libcrypto_utils \
-    libcrypto \
-    libbase
-LOCAL_CFLAGS := -Wall -Werror
-include $(BUILD_STATIC_LIBRARY)
-
-# Wear default device
-# ===============================
-include $(CLEAR_VARS)
-LOCAL_SRC_FILES := wear_device.cpp
-LOCAL_CFLAGS := -Wall -Werror
-
-# Should match TARGET_RECOVERY_UI_LIB in BoardConfig.mk.
-LOCAL_MODULE := librecovery_ui_wear
-
-include $(BUILD_STATIC_LIBRARY)
-
-# vr headset default device
-# ===============================
-include $(CLEAR_VARS)
-
-LOCAL_SRC_FILES := vr_device.cpp
-LOCAL_CFLAGS := -Wall -Werror
-
-# should match TARGET_RECOVERY_UI_LIB set in BoardConfig.mk
-LOCAL_MODULE := librecovery_ui_vr
-
-include $(BUILD_STATIC_LIBRARY)
-
 include \
     $(LOCAL_PATH)/boot_control/Android.mk \
-    $(LOCAL_PATH)/minadbd/Android.mk \
     $(LOCAL_PATH)/minui/Android.mk \
+    $(LOCAL_PATH)/sample_updater/Android.mk \
     $(LOCAL_PATH)/tests/Android.mk \
     $(LOCAL_PATH)/tools/Android.mk \
     $(LOCAL_PATH)/updater/Android.mk \
diff --git a/fuse_sideload/Android.bp b/fuse_sideload/Android.bp
new file mode 100644
index 0000000..76bc16d
--- /dev/null
+++ b/fuse_sideload/Android.bp
@@ -0,0 +1,37 @@
+// Copyright (C) 2018 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+cc_library_static {
+    name: "libfusesideload",
+
+    cflags: [
+        "-D_XOPEN_SOURCE",
+        "-D_GNU_SOURCE",
+        "-Wall",
+        "-Werror",
+    ],
+
+    srcs: [
+        "fuse_sideload.cpp",
+    ],
+
+    export_include_dirs: [
+        "include",
+    ],
+
+    static_libs: [
+        "libbase",
+        "libcrypto",
+    ],
+}
diff --git a/fuse_sideload.cpp b/fuse_sideload/fuse_sideload.cpp
similarity index 100%
rename from fuse_sideload.cpp
rename to fuse_sideload/fuse_sideload.cpp
diff --git a/fuse_sideload.h b/fuse_sideload/include/fuse_sideload.h
similarity index 100%
rename from fuse_sideload.h
rename to fuse_sideload/include/fuse_sideload.h
diff --git a/minadbd/Android.bp b/minadbd/Android.bp
new file mode 100644
index 0000000..432b2f0
--- /dev/null
+++ b/minadbd/Android.bp
@@ -0,0 +1,78 @@
+// Copyright (C) 2018 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+cc_defaults {
+    name: "minadbd_defaults",
+
+    cflags: [
+        "-DADB_HOST=0",
+        "-Wall",
+        "-Werror",
+    ],
+
+    include_dirs: [
+        "system/core/adb",
+    ],
+}
+
+cc_library_static {
+    name: "libminadbd",
+
+    defaults: [
+        "minadbd_defaults",
+    ],
+
+    srcs: [
+        "fuse_adb_provider.cpp",
+        "minadbd.cpp",
+        "minadbd_services.cpp",
+    ],
+
+    static_libs: [
+        "libfusesideload",
+        "libbase",
+        "libcrypto",
+    ],
+
+    whole_static_libs: [
+        "libadbd",
+    ],
+}
+
+cc_test {
+    name: "minadbd_test",
+
+    defaults: [
+        "minadbd_defaults",
+    ],
+
+    srcs: [
+        "fuse_adb_provider_test.cpp",
+    ],
+
+    static_libs: [
+        "libBionicGtestMain",
+        "libminadbd",
+    ],
+
+    shared_libs: [
+        "libbase",
+        "libcutils",
+        "liblog",
+    ],
+
+    test_suites: [
+        "device-tests",
+    ],
+}
diff --git a/minadbd/Android.mk b/minadbd/Android.mk
deleted file mode 100644
index 50e3b34..0000000
--- a/minadbd/Android.mk
+++ /dev/null
@@ -1,55 +0,0 @@
-# Copyright 2005 The Android Open Source Project
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-LOCAL_PATH:= $(call my-dir)
-
-minadbd_cflags := \
-    -Wall -Werror \
-    -DADB_HOST=0 \
-
-# libminadbd (static library)
-# ===============================
-include $(CLEAR_VARS)
-
-LOCAL_SRC_FILES := \
-    fuse_adb_provider.cpp \
-    minadbd.cpp \
-    minadbd_services.cpp \
-
-LOCAL_MODULE := libminadbd
-LOCAL_CFLAGS := $(minadbd_cflags)
-LOCAL_C_INCLUDES := bootable/recovery system/core/adb
-LOCAL_WHOLE_STATIC_LIBRARIES := libadbd
-LOCAL_STATIC_LIBRARIES := libcrypto libbase
-
-include $(BUILD_STATIC_LIBRARY)
-
-# minadbd_test (native test)
-# ===============================
-include $(CLEAR_VARS)
-
-LOCAL_MODULE := minadbd_test
-LOCAL_COMPATIBILITY_SUITE := device-tests
-LOCAL_SRC_FILES := fuse_adb_provider_test.cpp
-LOCAL_CFLAGS := $(minadbd_cflags)
-LOCAL_C_INCLUDES := $(LOCAL_PATH) system/core/adb
-LOCAL_STATIC_LIBRARIES := \
-    libBionicGtestMain \
-    libminadbd
-LOCAL_SHARED_LIBRARIES := \
-    liblog \
-    libbase \
-    libcutils
-
-include $(BUILD_NATIVE_TEST)
diff --git a/minui/font_10x18.h b/minui/font_10x18.h
deleted file mode 100644
index 30dfb9c..0000000
--- a/minui/font_10x18.h
+++ /dev/null
@@ -1,214 +0,0 @@
-struct {
-  unsigned width;
-  unsigned height;
-  unsigned char_width;
-  unsigned char_height;
-  unsigned char rundata[2973];
-} font = {
-  .width = 960,
-  .height = 18,
-  .char_width = 10,
-  .char_height = 18,
-  .rundata = {
-0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x55,0x82,0x06,0x82,0x02,0x82,0x10,0x82,
-0x11,0x83,0x08,0x82,0x0a,0x82,0x04,0x82,0x46,0x82,0x08,0x82,0x07,0x84,0x06,
-0x84,0x0a,0x81,0x03,0x88,0x04,0x84,0x04,0x88,0x04,0x84,0x06,0x84,0x1e,0x81,
-0x0e,0x81,0x0a,0x84,0x06,0x84,0x07,0x82,0x05,0x85,0x07,0x84,0x04,0x86,0x04,
-0x88,0x02,0x88,0x04,0x84,0x04,0x82,0x04,0x82,0x02,0x88,0x05,0x86,0x01,0x82,
-0x04,0x82,0x02,0x82,0x08,0x82,0x04,0x82,0x02,0x82,0x04,0x82,0x04,0x84,0x04,
-0x86,0x06,0x84,0x04,0x86,0x06,0x84,0x04,0x88,0x02,0x82,0x04,0x82,0x02,0x82,
-0x04,0x82,0x02,0x82,0x04,0x82,0x02,0x82,0x04,0x82,0x02,0x82,0x04,0x82,0x02,
-0x88,0x03,0x86,0x0e,0x86,0x06,0x82,0x11,0x82,0x10,0x82,0x18,0x82,0x0f,0x84,
-0x0d,0x82,0x1c,0x82,0x09,0x84,0x7f,0x16,0x84,0x05,0x82,0x05,0x84,0x07,0x83,
-0x02,0x82,0x19,0x82,0x06,0x82,0x02,0x82,0x06,0x82,0x01,0x82,0x03,0x86,0x04,
-0x83,0x02,0x82,0x03,0x82,0x01,0x82,0x07,0x82,0x09,0x82,0x06,0x82,0x3e,0x82,
-0x04,0x84,0x06,0x83,0x06,0x82,0x02,0x82,0x04,0x82,0x02,0x82,0x08,0x82,0x03,
-0x82,0x09,0x82,0x02,0x82,0x09,0x82,0x03,0x82,0x02,0x82,0x04,0x82,0x02,0x82,
-0x1c,0x82,0x0e,0x82,0x08,0x82,0x02,0x82,0x04,0x82,0x02,0x82,0x05,0x84,0x04,
-0x82,0x02,0x82,0x05,0x82,0x02,0x82,0x03,0x82,0x03,0x82,0x03,0x82,0x08,0x82,
-0x09,0x82,0x02,0x82,0x03,0x82,0x04,0x82,0x05,0x82,0x0a,0x82,0x03,0x82,0x04,
-0x82,0x02,0x82,0x08,0x82,0x04,0x82,0x02,0x83,0x03,0x82,0x03,0x82,0x02,0x82,
-0x03,0x82,0x03,0x82,0x04,0x82,0x02,0x82,0x03,0x82,0x03,0x82,0x04,0x82,0x02,
-0x82,0x06,0x82,0x05,0x82,0x04,0x82,0x02,0x82,0x04,0x82,0x02,0x82,0x04,0x82,
-0x02,0x82,0x04,0x82,0x02,0x82,0x04,0x82,0x08,0x82,0x03,0x82,0x08,0x82,0x0c,
-0x82,0x05,0x84,0x11,0x82,0x0f,0x82,0x18,0x82,0x0e,0x82,0x02,0x82,0x0c,0x82,
-0x1c,0x82,0x0b,0x82,0x7f,0x15,0x82,0x08,0x82,0x08,0x82,0x05,0x82,0x01,0x82,
-0x01,0x82,0x19,0x82,0x06,0x82,0x02,0x82,0x06,0x82,0x01,0x82,0x02,0x82,0x01,
-0x82,0x01,0x82,0x02,0x82,0x01,0x82,0x01,0x82,0x03,0x82,0x01,0x82,0x07,0x82,
-0x08,0x82,0x08,0x82,0x3d,0x82,0x03,0x82,0x02,0x82,0x04,0x84,0x05,0x82,0x04,
-0x82,0x02,0x82,0x04,0x82,0x06,0x83,0x03,0x82,0x08,0x82,0x04,0x81,0x09,0x82,
-0x02,0x82,0x04,0x82,0x02,0x82,0x04,0x82,0x1a,0x82,0x10,0x82,0x06,0x82,0x04,
-0x82,0x02,0x82,0x04,0x82,0x03,0x82,0x02,0x82,0x03,0x82,0x03,0x82,0x03,0x82,
-0x04,0x82,0x02,0x82,0x04,0x82,0x02,0x82,0x08,0x82,0x08,0x82,0x04,0x82,0x02,
-0x82,0x04,0x82,0x05,0x82,0x0a,0x82,0x03,0x82,0x03,0x82,0x03,0x82,0x08,0x83,
-0x02,0x83,0x02,0x83,0x03,0x82,0x02,0x82,0x04,0x82,0x02,0x82,0x04,0x82,0x02,
-0x82,0x04,0x82,0x02,0x82,0x04,0x82,0x02,0x82,0x04,0x82,0x05,0x82,0x05,0x82,
-0x04,0x82,0x02,0x82,0x04,0x82,0x02,0x82,0x04,0x82,0x03,0x82,0x02,0x82,0x04,
-0x82,0x02,0x82,0x09,0x82,0x03,0x82,0x08,0x82,0x0c,0x82,0x04,0x82,0x02,0x82,
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-0x09,0x82,0x02,0x82,0x08,0x82,0x04,0x82,0x02,0x82,0x04,0x82,0x02,0x82,0x04,
-0x82,0x08,0x82,0x02,0x82,0x04,0x82,0x02,0x82,0x06,0x83,0x07,0x83,0x09,0x82,
-0x0e,0x82,0x0a,0x82,0x06,0x82,0x03,0x82,0x02,0x82,0x04,0x82,0x02,0x82,0x03,
-0x82,0x04,0x82,0x02,0x82,0x03,0x82,0x03,0x82,0x03,0x82,0x08,0x82,0x09,0x82,
-0x02,0x83,0x02,0x82,0x04,0x82,0x05,0x82,0x06,0x82,0x01,0x82,0x04,0x82,0x04,
-0x82,0x02,0x82,0x08,0x82,0x04,0x82,0x02,0x82,0x04,0x82,0x03,0x82,0x02,0x82,
-0x03,0x82,0x09,0x82,0x02,0x82,0x03,0x82,0x04,0x82,0x03,0x82,0x02,0x82,0x06,
-0x82,0x06,0x82,0x02,0x82,0x06,0x82,0x05,0x82,0x04,0x82,0x02,0x82,0x04,0x82,
-0x05,0x82,0x05,0x82,0x09,0x82,0x0d,0x82,0x07,0x82,0x21,0x82,0x04,0x82,0x02,
-0x83,0x02,0x82,0x04,0x82,0x03,0x82,0x03,0x82,0x02,0x83,0x03,0x82,0x03,0x82,
-0x04,0x82,0x06,0x82,0x08,0x82,0x04,0x82,0x05,0x82,0x0b,0x82,0x02,0x82,0x03,
-0x82,0x06,0x82,0x05,0x82,0x01,0x82,0x01,0x82,0x02,0x82,0x04,0x82,0x03,0x82,
-0x02,0x82,0x03,0x83,0x02,0x82,0x04,0x82,0x02,0x83,0x03,0x82,0x07,0x82,0x04,
-0x82,0x04,0x82,0x02,0x82,0x03,0x82,0x02,0x83,0x05,0x82,0x05,0x88,0x03,0x82,
-0x02,0x82,0x04,0x82,0x02,0x83,0x03,0x82,0x0a,0x82,0x08,0x82,0x08,0x82,0x26,
-0x82,0x1c,0x82,0x06,0x82,0x02,0x83,0x03,0x84,0x02,0x82,0x10,0x82,0x04,0x82,
-0x1e,0x83,0x11,0x83,0x05,0x82,0x0a,0x82,0x05,0x88,0x02,0x88,0x04,0x84,0x09,
-0x82,0x05,0x84,0x06,0x84,0x05,0x82,0x09,0x84,0x06,0x84,0x07,0x83,0x07,0x83,
-0x0a,0x81,0x0e,0x81,0x0b,0x82,0x07,0x85,0x03,0x82,0x04,0x82,0x02,0x86,0x06,
-0x84,0x04,0x86,0x04,0x88,0x02,0x82,0x0a,0x84,0x01,0x81,0x02,0x82,0x04,0x82,
-0x02,0x88,0x04,0x83,0x05,0x82,0x04,0x82,0x02,0x88,0x02,0x82,0x04,0x82,0x02,
-0x82,0x04,0x82,0x04,0x84,0x04,0x82,0x0a,0x85,0x03,0x82,0x04,0x82,0x04,0x84,
-0x07,0x82,0x07,0x84,0x07,0x82,0x05,0x82,0x04,0x82,0x02,0x82,0x04,0x82,0x05,
-0x82,0x05,0x88,0x03,0x86,0x09,0x82,0x03,0x86,0x22,0x85,0x01,0x81,0x02,0x82,
-0x01,0x83,0x06,0x85,0x05,0x83,0x01,0x82,0x04,0x85,0x05,0x82,0x07,0x86,0x03,
-0x82,0x04,0x82,0x02,0x88,0x08,0x82,0x02,0x82,0x04,0x82,0x02,0x88,0x02,0x82,
-0x01,0x82,0x01,0x82,0x02,0x82,0x04,0x82,0x04,0x84,0x04,0x82,0x01,0x83,0x06,
-0x83,0x01,0x82,0x03,0x82,0x08,0x86,0x06,0x84,0x05,0x83,0x01,0x82,0x05,0x82,
-0x06,0x82,0x02,0x82,0x03,0x82,0x04,0x82,0x04,0x83,0x01,0x82,0x03,0x87,0x06,
-0x84,0x05,0x82,0x05,0x84,0x7f,0x15,0x83,0x7f,0x14,0x83,0x7f,0x5e,0x82,0x7f,
-0x05,0x89,0x47,0x82,0x04,0x82,0x17,0x82,0x03,0x82,0x34,0x82,0x0e,0x82,0x4e,
-0x82,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x0a,0x82,0x04,0x82,0x17,0x82,0x03,0x82,
-0x34,0x82,0x0e,0x82,0x48,0x82,0x04,0x82,0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x0a,
-0x82,0x04,0x82,0x17,0x82,0x03,0x82,0x34,0x82,0x0e,0x82,0x49,0x82,0x02,0x82,
-0x7f,0x7f,0x7f,0x7f,0x7f,0x7f,0x0c,0x86,0x19,0x85,0x35,0x82,0x0e,0x82,0x4a,
-0x84,0x3f,
-0x00,
-  }
-};
diff --git a/minui/graphics.cpp b/minui/graphics.cpp
index 56f471b..202ce71 100644
--- a/minui/graphics.cpp
+++ b/minui/graphics.cpp
@@ -23,7 +23,6 @@
 
 #include <memory>
 
-#include "font_10x18.h"
 #include "graphics_adf.h"
 #include "graphics_drm.h"
 #include "graphics_fbdev.h"
@@ -313,42 +312,16 @@
   return 0;
 }
 
-static void gr_init_font(void) {
-  int res = gr_init_font("font", &gr_font);
-  if (res == 0) {
-    return;
-  }
-
-  printf("failed to read font: res=%d\n", res);
-
-  // fall back to the compiled-in font.
-  gr_font = static_cast<GRFont*>(calloc(1, sizeof(*gr_font)));
-  gr_font->texture = static_cast<GRSurface*>(malloc(sizeof(*gr_font->texture)));
-  gr_font->texture->width = font.width;
-  gr_font->texture->height = font.height;
-  gr_font->texture->row_bytes = font.width;
-  gr_font->texture->pixel_bytes = 1;
-
-  unsigned char* bits = static_cast<unsigned char*>(malloc(font.width * font.height));
-  gr_font->texture->data = bits;
-
-  unsigned char data;
-  unsigned char* in = font.rundata;
-  while ((data = *in++)) {
-    memset(bits, (data & 0x80) ? 255 : 0, data & 0x7f);
-    bits += (data & 0x7f);
-  }
-
-  gr_font->char_width = font.char_width;
-  gr_font->char_height = font.char_height;
-}
-
 void gr_flip() {
   gr_draw = gr_backend->Flip();
 }
 
 int gr_init() {
-  gr_init_font();
+  int ret = gr_init_font("font", &gr_font);
+  if (ret != 0) {
+    printf("Failed to init font: %d\n", ret);
+    return -1;
+  }
 
   auto backend = std::unique_ptr<MinuiBackend>{ std::make_unique<MinuiBackendAdf>() };
   gr_draw = backend->Init();
diff --git a/minui/mkfont.c b/minui/mkfont.c
deleted file mode 100644
index 61a5ede..0000000
--- a/minui/mkfont.c
+++ /dev/null
@@ -1,54 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-
-int main(int argc, char *argv)
-{
-    unsigned n;
-    unsigned char *x;
-    unsigned m;
-    unsigned run_val;
-    unsigned run_count;
- 
-    n = gimp_image.width * gimp_image.height;
-    m = 0;
-    x = gimp_image.pixel_data;
-
-    printf("struct {\n");
-    printf("  unsigned width;\n");
-    printf("  unsigned height;\n");
-    printf("  unsigned cwidth;\n");
-    printf("  unsigned cheight;\n");
-    printf("  unsigned char rundata[];\n");
-    printf("} font = {\n");
-    printf("  .width = %d,\n  .height = %d,\n  .cwidth = %d,\n  .cheight = %d,\n", gimp_image.width, gimp_image.height,
-           gimp_image.width / 96, gimp_image.height);
-    printf("  .rundata = {\n");
-   
-    run_val = (*x ? 0 : 255);
-    run_count = 1;
-    n--;
-    x+=3;
-
-    while(n-- > 0) {
-        unsigned val = (*x ? 0 : 255);
-        x+=3;
-        if((val == run_val) && (run_count < 127)) {
-            run_count++;
-        } else {
-eject:
-            printf("0x%02x,",run_count | (run_val ? 0x80 : 0x00));
-            run_val = val;
-            run_count = 1;
-            m += 5;
-            if(m >= 75) {
-                printf("\n");
-                m = 0;
-            }
-        }
-    }
-    printf("0x%02x,",run_count | (run_val ? 0x80 : 0x00));
-    printf("\n0x00,");
-    printf("\n");
-    printf("  }\n};\n");
-    return 0;
-}
diff --git a/recovery.cpp b/recovery.cpp
index d887d07..e266d93 100644
--- a/recovery.cpp
+++ b/recovery.cpp
@@ -1557,14 +1557,14 @@
     // to log the update attempt since update_package is non-NULL.
     modified_flash = true;
 
-    if (!is_battery_ok()) {
+    if (retry_count == 0 && !is_battery_ok()) {
       ui->Print("battery capacity is not enough for installing package, needed is %d%%\n",
                 BATTERY_OK_PERCENTAGE);
       // Log the error code to last_install when installation skips due to
       // low battery.
       log_failure_code(kLowBattery, update_package);
       status = INSTALL_SKIPPED;
-    } else if (bootreason_in_blacklist()) {
+    } else if (retry_count == 0 && bootreason_in_blacklist()) {
       // Skip update-on-reboot when bootreason is kernel_panic or similar
       ui->Print("bootreason is in the blacklist; skip OTA installation\n");
       log_failure_code(kBootreasonInBlacklist, update_package);
diff --git a/sample_updater/Android.mk b/sample_updater/Android.mk
new file mode 100644
index 0000000..2b0fcbe
--- /dev/null
+++ b/sample_updater/Android.mk
@@ -0,0 +1,27 @@
+#
+# Copyright (C) 2018 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_PACKAGE_NAME := SystemUpdateApp
+LOCAL_SDK_VERSION := system_current
+LOCAL_MODULE_TAGS := optional
+
+LOCAL_SRC_FILES := $(call all-java-files-under, src)
+
+include $(BUILD_PACKAGE)
diff --git a/sample_updater/AndroidManifest.xml b/sample_updater/AndroidManifest.xml
new file mode 100644
index 0000000..66414b5
--- /dev/null
+++ b/sample_updater/AndroidManifest.xml
@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright (C) 2018 The Android Open Source Project
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="com.android.update">
+
+  <application android:label="Sample Updater">
+    <activity android:name=".ui.SystemUpdateActivity"
+              android:label="Sample Updater">
+      <intent-filter>
+        <action android:name="android.intent.action.MAIN" />
+        <category android:name="android.intent.category.LAUNCHER" />
+      </intent-filter>
+    </activity>
+  </application>
+
+</manifest>
+
diff --git a/sample_updater/README.md b/sample_updater/README.md
new file mode 100644
index 0000000..a06c52d
--- /dev/null
+++ b/sample_updater/README.md
@@ -0,0 +1 @@
+# System update sample app.
diff --git a/sample_updater/res/layout/activity_main.xml b/sample_updater/res/layout/activity_main.xml
new file mode 100644
index 0000000..bd7d686
--- /dev/null
+++ b/sample_updater/res/layout/activity_main.xml
@@ -0,0 +1,20 @@
+<!--
+  Copyright (C) 2018 The Android Open Source Project
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  -->
+
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+</LinearLayout>
diff --git a/sample_updater/src/com/android/update/ui/SystemUpdateActivity.java b/sample_updater/src/com/android/update/ui/SystemUpdateActivity.java
new file mode 100644
index 0000000..e57b167
--- /dev/null
+++ b/sample_updater/src/com/android/update/ui/SystemUpdateActivity.java
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.update.ui;
+
+import android.app.Activity;
+import android.os.UpdateEngine;
+import android.os.UpdateEngineCallback;
+
+/** Main update activity. */
+public class SystemUpdateActivity extends Activity {
+
+  private UpdateEngine updateEngine;
+  private UpdateEngineCallbackImpl updateEngineCallbackImpl = new UpdateEngineCallbackImpl(this);
+
+  @Override
+  public void onResume() {
+    super.onResume();
+    updateEngine = new UpdateEngine();
+    updateEngine.bind(updateEngineCallbackImpl);
+  }
+
+  @Override
+  public void onPause() {
+    updateEngine.unbind();
+    super.onPause();
+  }
+
+  void onStatusUpdate(int i, float v) {
+    // Handle update engine status update
+  }
+
+  void onPayloadApplicationComplete(int i) {
+    // Handle apply payload completion
+  }
+
+  private static class UpdateEngineCallbackImpl extends UpdateEngineCallback {
+
+    private final SystemUpdateActivity activity;
+
+    public UpdateEngineCallbackImpl(SystemUpdateActivity activity) {
+      this.activity = activity;
+    }
+
+    @Override
+    public void onStatusUpdate(int i, float v) {
+      activity.onStatusUpdate(i, v);
+    }
+
+    @Override
+    public void onPayloadApplicationComplete(int i) {
+      activity.onPayloadApplicationComplete(i);
+    }
+  }
+}
diff --git a/screen_ui.cpp b/screen_ui.cpp
index c8fb5aa..317e552 100644
--- a/screen_ui.cpp
+++ b/screen_ui.cpp
@@ -53,7 +53,98 @@
   return tv.tv_sec + tv.tv_usec / 1000000.0;
 }
 
-ScreenRecoveryUI::ScreenRecoveryUI()
+Menu::Menu(bool scrollable, size_t max_items, size_t max_length)
+    : scrollable_(scrollable),
+      max_display_items_(max_items),
+      max_item_length_(max_length),
+      text_headers_(nullptr),
+      menu_start_(0),
+      selection_(0) {
+  CHECK_LE(max_items, static_cast<size_t>(std::numeric_limits<int>::max()));
+}
+
+const char* const* Menu::text_headers() const {
+  return text_headers_;
+}
+
+std::string Menu::TextItem(size_t index) const {
+  CHECK_LT(index, text_items_.size());
+
+  return text_items_[index];
+}
+
+size_t Menu::MenuStart() const {
+  return menu_start_;
+}
+
+size_t Menu::MenuEnd() const {
+  return std::min(ItemsCount(), menu_start_ + max_display_items_);
+}
+
+size_t Menu::ItemsCount() const {
+  return text_items_.size();
+}
+
+bool Menu::ItemsOverflow(std::string* cur_selection_str) const {
+  if (!scrollable_ || static_cast<size_t>(ItemsCount()) <= max_display_items_) {
+    return false;
+  }
+
+  *cur_selection_str =
+      android::base::StringPrintf("Current item: %d/%zu", selection_ + 1, ItemsCount());
+  return true;
+}
+
+void Menu::Start(const char* const* headers, const char* const* items, int initial_selection) {
+  text_headers_ = headers;
+
+  // It's fine to have more entries than text_rows_ if scrollable menu is supported.
+  size_t max_items_count = scrollable_ ? std::numeric_limits<int>::max() : max_display_items_;
+  for (size_t i = 0; i < max_items_count && items[i] != nullptr; ++i) {
+    text_items_.emplace_back(items[i], strnlen(items[i], max_item_length_));
+  }
+
+  CHECK(!text_items_.empty());
+  selection_ = initial_selection;
+}
+
+// TODO(xunchang) modify the function parameters to button up & down.
+int Menu::Select(int sel) {
+  CHECK_LE(ItemsCount(), static_cast<size_t>(std::numeric_limits<int>::max()));
+  int count = ItemsCount();
+
+  // Wraps the selection at boundary if the menu is not scrollable.
+  if (!scrollable_) {
+    if (sel < 0) {
+      selection_ = count - 1;
+    } else if (sel >= count) {
+      selection_ = 0;
+    } else {
+      selection_ = sel;
+    }
+
+    return selection_;
+  }
+
+  if (sel < 0) {
+    selection_ = 0;
+  } else if (sel >= count) {
+    selection_ = count - 1;
+  } else {
+    if (static_cast<size_t>(sel) < menu_start_) {
+      menu_start_--;
+    } else if (static_cast<size_t>(sel) >= MenuEnd()) {
+      menu_start_++;
+    }
+    selection_ = sel;
+  }
+
+  return selection_;
+}
+
+ScreenRecoveryUI::ScreenRecoveryUI() : ScreenRecoveryUI(false) {}
+
+ScreenRecoveryUI::ScreenRecoveryUI(bool scrollable_menu)
     : kMarginWidth(RECOVERY_UI_MARGIN_WIDTH),
       kMarginHeight(RECOVERY_UI_MARGIN_HEIGHT),
       kAnimationFps(RECOVERY_UI_ANIMATION_FPS),
@@ -71,10 +162,7 @@
       text_row_(0),
       show_text(false),
       show_text_ever(false),
-      menu_headers_(nullptr),
-      show_menu(false),
-      menu_items(0),
-      menu_sel(0),
+      scrollable_menu_(scrollable_menu),
       file_viewer_text_(nullptr),
       intro_frames(0),
       loop_frames(0),
@@ -407,13 +495,13 @@
 
 static const char* REGULAR_HELP[] = {
   "Use volume up/down and power.",
-  NULL
+  nullptr,
 };
 
 static const char* LONG_PRESS_HELP[] = {
   "Any button cycles highlight.",
   "Long-press activates.",
-  NULL
+  nullptr,
 };
 
 // Redraws everything on the screen. Does not flip pages. Should only be called with updateMutex
@@ -428,8 +516,13 @@
   gr_color(0, 0, 0, 255);
   gr_clear();
 
+  draw_menu_and_text_buffer_locked(HasThreeButtons() ? REGULAR_HELP : LONG_PRESS_HELP);
+}
+
+// Draws the menu and text buffer on the screen. Should only be called with updateMutex locked.
+void ScreenRecoveryUI::draw_menu_and_text_buffer_locked(const char* const* help_message) {
   int y = kMarginHeight;
-  if (show_menu) {
+  if (menu_) {
     static constexpr int kMenuIndent = 4;
     int x = kMarginWidth + kMenuIndent;
 
@@ -440,26 +533,46 @@
     for (const auto& chunk : android::base::Split(recovery_fingerprint, ":")) {
       y += DrawTextLine(x, y, chunk.c_str(), false);
     }
-    y += DrawTextLines(x, y, HasThreeButtons() ? REGULAR_HELP : LONG_PRESS_HELP);
 
+    y += DrawTextLines(x, y, help_message);
+
+    // Draw menu header.
     SetColor(HEADER);
-    // Ignore kMenuIndent, which is not taken into account by text_cols_.
-    y += DrawWrappedTextLines(kMarginWidth, y, menu_headers_);
+    if (!menu_->scrollable()) {
+      y += DrawWrappedTextLines(x, y, menu_->text_headers());
+    } else {
+      y += DrawTextLines(x, y, menu_->text_headers());
+      // Show the current menu item number in relation to total number if items don't fit on the
+      // screen.
+      std::string cur_selection_str;
+      if (menu_->ItemsOverflow(&cur_selection_str)) {
+        y += DrawTextLine(x, y, cur_selection_str.c_str(), true);
+      }
+    }
 
+    // Draw menu items.
     SetColor(MENU);
-    y += DrawHorizontalRule(y) + 4;
-    for (int i = 0; i < menu_items; ++i) {
-      if (i == menu_sel) {
+    // Do not draw the horizontal rule for wear devices.
+    if (!menu_->scrollable()) {
+      y += DrawHorizontalRule(y) + 4;
+    }
+    for (size_t i = menu_->MenuStart(); i < menu_->MenuEnd(); ++i) {
+      bool bold = false;
+      if (i == static_cast<size_t>(menu_->selection())) {
         // Draw the highlight bar.
         SetColor(IsLongPress() ? MENU_SEL_BG_ACTIVE : MENU_SEL_BG);
-        DrawHighlightBar(0, y - 2, ScreenWidth(), char_height_ + 4);
+
+        int bar_height = char_height_ + 4;
+        DrawHighlightBar(0, y - 2, ScreenWidth(), bar_height);
+
         // Bold white text for the selected item.
         SetColor(MENU_SEL_FG);
-        y += DrawTextLine(x, y, menu_[i].c_str(), true);
-        SetColor(MENU);
-      } else {
-        y += DrawTextLine(x, y, menu_[i].c_str(), false);
+        bold = true;
       }
+
+      y += DrawTextLine(x, y, menu_->TextItem(i).c_str(), bold);
+
+      SetColor(MENU);
     }
     y += DrawHorizontalRule(y);
   }
@@ -864,15 +977,10 @@
 void ScreenRecoveryUI::StartMenu(const char* const* headers, const char* const* items,
                                  int initial_selection) {
   pthread_mutex_lock(&updateMutex);
-  if (text_rows_ > 0 && text_cols_ > 0) {
-    menu_headers_ = headers;
-    menu_.clear();
-    for (size_t i = 0; i < text_rows_ && items[i] != nullptr; ++i) {
-      menu_.emplace_back(std::string(items[i], strnlen(items[i], text_cols_ - 1)));
-    }
-    menu_items = static_cast<int>(menu_.size());
-    show_menu = true;
-    menu_sel = initial_selection;
+  if (text_rows_ > 0 && text_cols_ > 1) {
+    menu_ = std::make_unique<Menu>(scrollable_menu_, text_rows_, text_cols_ - 1);
+    menu_->Start(headers, items, initial_selection);
+
     update_screen_locked();
   }
   pthread_mutex_unlock(&updateMutex);
@@ -880,16 +988,13 @@
 
 int ScreenRecoveryUI::SelectMenu(int sel) {
   pthread_mutex_lock(&updateMutex);
-  if (show_menu) {
-    int old_sel = menu_sel;
-    menu_sel = sel;
+  if (menu_) {
+    int old_sel = menu_->selection();
+    sel = menu_->Select(sel);
 
-    // Wrap at top and bottom.
-    if (menu_sel < 0) menu_sel = menu_items - 1;
-    if (menu_sel >= menu_items) menu_sel = 0;
-
-    sel = menu_sel;
-    if (menu_sel != old_sel) update_screen_locked();
+    if (sel != old_sel) {
+      update_screen_locked();
+    }
   }
   pthread_mutex_unlock(&updateMutex);
   return sel;
@@ -897,8 +1002,8 @@
 
 void ScreenRecoveryUI::EndMenu() {
   pthread_mutex_lock(&updateMutex);
-  if (show_menu && text_rows_ > 0 && text_cols_ > 0) {
-    show_menu = false;
+  if (menu_) {
+    menu_.reset();
     update_screen_locked();
   }
   pthread_mutex_unlock(&updateMutex);
diff --git a/screen_ui.h b/screen_ui.h
index f05761c..c1222a5 100644
--- a/screen_ui.h
+++ b/screen_ui.h
@@ -20,6 +20,7 @@
 #include <pthread.h>
 #include <stdio.h>
 
+#include <memory>
 #include <string>
 #include <vector>
 
@@ -28,6 +29,70 @@
 // From minui/minui.h.
 struct GRSurface;
 
+// This class maintains the menu selection and display of the screen ui.
+class Menu {
+ public:
+  Menu(bool scrollable, size_t max_items, size_t max_length);
+
+  bool scrollable() const {
+    return scrollable_;
+  }
+
+  int selection() const {
+    return selection_;
+  }
+
+  // Returns count of menu items.
+  size_t ItemsCount() const;
+  // Returns the index of the first menu item.
+  size_t MenuStart() const;
+  // Returns the index of the last menu item + 1.
+  size_t MenuEnd() const;
+
+  // Menu example:
+  // info:                           Android Recovery
+  //                                 ....
+  // help messages:                  Swipe up/down to move
+  //                                 Swipe left/right to select
+  // empty line (horizontal rule):
+  // menu headers:                   Select file to view
+  // menu items:                     /cache/recovery/last_log
+  //                                 /cache/recovery/last_log.1
+  //                                 /cache/recovery/last_log.2
+  //                                 ...
+  const char* const* text_headers() const;
+  std::string TextItem(size_t index) const;
+
+  // Checks if the menu items fit vertically on the screen. Returns true and set the
+  // |cur_selection_str| if the items exceed the screen limit.
+  bool ItemsOverflow(std::string* cur_selection_str) const;
+
+  // Starts the menu with |headers| and |items| in text. Sets the default selection to
+  // |initial_selection|.
+  void Start(const char* const* headers, const char* const* items, int initial_selection);
+
+  // Sets the current selection to |sel|. Handle the overflow cases depending on if the menu is
+  // scrollable.
+  int Select(int sel);
+
+ private:
+  // The menu is scrollable to display more items. Used on wear devices who have smaller screens.
+  const bool scrollable_;
+  // The max number of menu items to fit vertically on a screen.
+  const size_t max_display_items_;
+  // The length of each item to fit horizontally on a screen.
+  const size_t max_item_length_;
+
+  // Internal storage for the menu headers and items in text.
+  const char* const* text_headers_;
+  std::vector<std::string> text_items_;
+
+  // The first item to display on the screen.
+  size_t menu_start_;
+  // Current menu selection.
+  int selection_;
+};
+
 // Implementation of RecoveryUI appropriate for devices with a screen
 // (shows an icon + a progress bar, text logging, menu, etc.)
 class ScreenRecoveryUI : public RecoveryUI {
@@ -44,6 +109,7 @@
   };
 
   ScreenRecoveryUI();
+  explicit ScreenRecoveryUI(bool scrollable_menu);
 
   bool Init(const std::string& locale) override;
 
@@ -101,6 +167,7 @@
   virtual void draw_background_locked();
   virtual void draw_foreground_locked();
   virtual void draw_screen_locked();
+  virtual void draw_menu_and_text_buffer_locked(const char* const* help_message);
   virtual void update_screen_locked();
   virtual void update_progress_locked();
 
@@ -184,10 +251,8 @@
   bool show_text;
   bool show_text_ever;  // has show_text ever been true?
 
-  std::vector<std::string> menu_;
-  const char* const* menu_headers_;
-  bool show_menu;
-  int menu_items, menu_sel;
+  bool scrollable_menu_;
+  std::unique_ptr<Menu> menu_;
 
   // An alternate text screen, swapped with 'text_' when we're viewing a log file.
   char** file_viewer_text_;
diff --git a/tests/Android.mk b/tests/Android.mk
index b3584fe..58cefd2 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -23,6 +23,7 @@
 LOCAL_COMPATIBILITY_SUITE := device-tests
 LOCAL_STATIC_LIBRARIES := \
     libverifier \
+    librecovery_ui \
     libminui \
     libotautil \
     libupdater \
@@ -38,11 +39,14 @@
     unit/dirutil_test.cpp \
     unit/locale_test.cpp \
     unit/rangeset_test.cpp \
+    unit/screen_ui_test.cpp \
     unit/sysutil_test.cpp \
-    unit/zip_test.cpp \
+    unit/zip_test.cpp
 
 LOCAL_C_INCLUDES := bootable/recovery
 LOCAL_SHARED_LIBRARIES := liblog
+LOCAL_TEST_DATA := \
+    $(call find-test-data-in-subdirs, $(LOCAL_PATH), "*", testdata)
 include $(BUILD_NATIVE_TEST)
 
 # Manual tests
@@ -59,25 +63,8 @@
     liblog \
     libpng
 
-resource_files := $(call find-files-in-subdirs, bootable/recovery, \
-    "*_text.png", \
-    res-mdpi/images \
-    res-hdpi/images \
-    res-xhdpi/images \
-    res-xxhdpi/images \
-    res-xxxhdpi/images \
-    )
-
-# The resource image files that will go to $OUT/data/nativetest/recovery.
-testimage_out_path := $(TARGET_OUT_DATA)/nativetest/recovery
-GEN := $(addprefix $(testimage_out_path)/, $(resource_files))
-
-$(GEN): PRIVATE_PATH := $(LOCAL_PATH)
-$(GEN): PRIVATE_CUSTOM_TOOL = cp $< $@
-$(GEN): $(testimage_out_path)/% : bootable/recovery/%
-	$(transform-generated-source)
-LOCAL_GENERATED_SOURCES += $(GEN)
-
+LOCAL_TEST_DATA := \
+    $(call find-test-data-in-subdirs, bootable/recovery, "*_text.png", res-*)
 include $(BUILD_NATIVE_TEST)
 
 # Component tests
@@ -169,29 +156,8 @@
     libBionicGtestMain \
     $(tune2fs_static_libraries)
 
-testdata_files := $(call find-subdir-files, testdata/*)
-
-# The testdata files that will go to $OUT/data/nativetest/recovery.
-testdata_out_path := $(TARGET_OUT_DATA)/nativetest/recovery
-GEN := $(addprefix $(testdata_out_path)/, $(testdata_files))
-$(GEN): PRIVATE_PATH := $(LOCAL_PATH)
-$(GEN): PRIVATE_CUSTOM_TOOL = cp $< $@
-$(GEN): $(testdata_out_path)/% : $(LOCAL_PATH)/%
-	$(transform-generated-source)
-LOCAL_GENERATED_SOURCES += $(GEN)
-
-# A copy of the testdata to be packed into continuous_native_tests.zip.
-testdata_continuous_zip_prefix := \
-    $(call intermediates-dir-for,PACKAGING,recovery_component_test)/DATA
-testdata_continuous_zip_path := $(testdata_continuous_zip_prefix)/nativetest/recovery
-GEN := $(addprefix $(testdata_continuous_zip_path)/, $(testdata_files))
-$(GEN): PRIVATE_PATH := $(LOCAL_PATH)
-$(GEN): PRIVATE_CUSTOM_TOOL = cp $< $@
-$(GEN): $(testdata_continuous_zip_path)/% : $(LOCAL_PATH)/%
-	$(transform-generated-source)
-LOCAL_GENERATED_SOURCES += $(GEN)
-LOCAL_PICKUP_FILES := $(testdata_continuous_zip_prefix)
-
+LOCAL_TEST_DATA := \
+    $(call find-test-data-in-subdirs, $(LOCAL_PATH), "*", testdata)
 include $(BUILD_NATIVE_TEST)
 
 # Host tests
@@ -220,4 +186,6 @@
     libBionicGtestMain
 LOCAL_SHARED_LIBRARIES := \
     liblog
+LOCAL_TEST_DATA := \
+    $(call find-test-data-in-subdirs, $(LOCAL_PATH), "*", testdata)
 include $(BUILD_HOST_NATIVE_TEST)
diff --git a/tests/AndroidTest.xml b/tests/AndroidTest.xml
index 3999aa5..6b86085 100644
--- a/tests/AndroidTest.xml
+++ b/tests/AndroidTest.xml
@@ -16,16 +16,18 @@
 <configuration description="Config for recovery_component_test and recovery_unit_test">
     <target_preparer class="com.android.tradefed.targetprep.PushFilePreparer">
         <option name="cleanup" value="true" />
-        <option name="push" value="recovery_component_test->/data/local/tmp/recovery_component_test" />
-        <option name="push" value="recovery_unit_test->/data/local/tmp/recovery_unit_test" />
+        <option name="push" value="recovery_component_test->/data/local/tmp/recovery_component_test/recovery_component_test" />
+        <option name="push" value="testdata->/data/local/tmp/recovery_component_test/testdata" />
+        <option name="push" value="recovery_unit_test->/data/local/tmp/recovery_unit_test/recovery_unit_test" />
+        <option name="push" value="testdata->/data/local/tmp/recovery_unit_test/testdata" />
     </target_preparer>
     <option name="test-suite-tag" value="apct" />
     <test class="com.android.tradefed.testtype.GTest" >
-        <option name="native-test-device-path" value="/data/local/tmp" />
+        <option name="native-test-device-path" value="/data/local/tmp/recovery_component_test" />
         <option name="module-name" value="recovery_component_test" />
     </test>
     <test class="com.android.tradefed.testtype.GTest" >
-        <option name="native-test-device-path" value="/data/local/tmp" />
+        <option name="native-test-device-path" value="/data/local/tmp/recovery_unit_test" />
         <option name="module-name" value="recovery_unit_test" />
     </test>
 </configuration>
diff --git a/tests/common/test_constants.h b/tests/common/test_constants.h
index 514818e..b6c27a7 100644
--- a/tests/common/test_constants.h
+++ b/tests/common/test_constants.h
@@ -17,10 +17,10 @@
 #ifndef _OTA_TEST_CONSTANTS_H
 #define _OTA_TEST_CONSTANTS_H
 
-#include <stdlib.h>
-
 #include <string>
 
+#include <android-base/file.h>
+
 // Zip entries in ziptest_valid.zip.
 static const std::string kATxtContents("abcdefghabcdefgh\n");
 static const std::string kBTxtContents("abcdefgh\n");
@@ -32,14 +32,9 @@
 // echo -n -e "abcdefgh\n" | sha1sum
 static const std::string kBTxtSha1Sum("e414af7161c9554089f4106d6f1797ef14a73666");
 
-static std::string from_testdata_base(const std::string& fname) {
-#ifdef __ANDROID__
-  static std::string data_root = getenv("ANDROID_DATA");
-#else
-  static std::string data_root = std::string(getenv("ANDROID_PRODUCT_OUT")) + "/data";
-#endif
-
-  return data_root + "/nativetest/recovery/testdata/" + fname;
+[[maybe_unused]] static std::string from_testdata_base(const std::string& fname) {
+  static std::string exec_dir = android::base::GetExecutableDirectory();
+  return exec_dir + "/testdata/" + fname;
 }
 
 #endif  // _OTA_TEST_CONSTANTS_H
diff --git a/tests/component/applypatch_test.cpp b/tests/component/applypatch_test.cpp
index 61e06ad..9160285 100644
--- a/tests/component/applypatch_test.cpp
+++ b/tests/component/applypatch_test.cpp
@@ -205,67 +205,96 @@
   sha1sum(boot_img, &boot_img_sha1, &boot_img_size);
 
   std::string recovery_img = from_testdata_base("recovery.img");
-  size_t size;
+  size_t recovery_img_size;
   std::string recovery_img_sha1;
-  sha1sum(recovery_img, &recovery_img_sha1, &size);
-  std::string recovery_img_size = std::to_string(size);
+  sha1sum(recovery_img, &recovery_img_sha1, &recovery_img_size);
+  std::string recovery_img_size_arg = std::to_string(recovery_img_size);
 
   std::string bonus_file = from_testdata_base("bonus.file");
 
   // applypatch -b <bonus-file> <src-file> <tgt-file> <tgt-sha1> <tgt-size> <src-sha1>:<patch>
-  TemporaryFile tmp1;
-  std::string src_file =
+  std::string src_file_arg =
       "EMMC:" + boot_img + ":" + std::to_string(boot_img_size) + ":" + boot_img_sha1;
-  std::string tgt_file = "EMMC:" + std::string(tmp1.path);
-  std::string patch = boot_img_sha1 + ":" + from_testdata_base("recovery-from-boot.p");
-  std::vector<const char*> args = {
-    "applypatch",
-    "-b",
-    bonus_file.c_str(),
-    src_file.c_str(),
-    tgt_file.c_str(),
-    recovery_img_sha1.c_str(),
-    recovery_img_size.c_str(),
-    patch.c_str()
-  };
+  TemporaryFile tgt_file;
+  std::string tgt_file_arg = "EMMC:"s + tgt_file.path;
+  std::string patch_arg = boot_img_sha1 + ":" + from_testdata_base("recovery-from-boot.p");
+  std::vector<const char*> args = { "applypatch",
+                                    "-b",
+                                    bonus_file.c_str(),
+                                    src_file_arg.c_str(),
+                                    tgt_file_arg.c_str(),
+                                    recovery_img_sha1.c_str(),
+                                    recovery_img_size_arg.c_str(),
+                                    patch_arg.c_str() };
   ASSERT_EQ(0, applypatch_modes(args.size(), args.data()));
+}
+
+// Tests patching the EMMC target without a separate bonus file (i.e. recovery-from-boot patch has
+// everything).
+TEST_F(ApplyPatchModesTest, PatchModeEmmcTargetWithoutBonusFile) {
+  std::string boot_img = from_testdata_base("boot.img");
+  size_t boot_img_size;
+  std::string boot_img_sha1;
+  sha1sum(boot_img, &boot_img_sha1, &boot_img_size);
+
+  std::string recovery_img = from_testdata_base("recovery.img");
+  size_t recovery_img_size;
+  std::string recovery_img_sha1;
+  sha1sum(recovery_img, &recovery_img_sha1, &recovery_img_size);
+  std::string recovery_img_size_arg = std::to_string(recovery_img_size);
 
   // applypatch <src-file> <tgt-file> <tgt-sha1> <tgt-size> <src-sha1>:<patch>
-  TemporaryFile tmp2;
-  patch = boot_img_sha1 + ":" + from_testdata_base("recovery-from-boot-with-bonus.p");
-  tgt_file = "EMMC:" + std::string(tmp2.path);
-  std::vector<const char*> args2 = {
-    "applypatch",
-    src_file.c_str(),
-    tgt_file.c_str(),
-    recovery_img_sha1.c_str(),
-    recovery_img_size.c_str(),
-    patch.c_str()
-  };
-  ASSERT_EQ(0, applypatch_modes(args2.size(), args2.data()));
+  std::string src_file_arg =
+      "EMMC:" + boot_img + ":" + std::to_string(boot_img_size) + ":" + boot_img_sha1;
+  TemporaryFile tgt_file;
+  std::string tgt_file_arg = "EMMC:"s + tgt_file.path;
+  std::string patch_arg =
+      boot_img_sha1 + ":" + from_testdata_base("recovery-from-boot-with-bonus.p");
+  std::vector<const char*> args = { "applypatch",
+                                    src_file_arg.c_str(),
+                                    tgt_file_arg.c_str(),
+                                    recovery_img_sha1.c_str(),
+                                    recovery_img_size_arg.c_str(),
+                                    patch_arg.c_str() };
+  ASSERT_EQ(0, applypatch_modes(args.size(), args.data()));
+}
+
+TEST_F(ApplyPatchModesTest, PatchModeEmmcTargetWithMultiplePatches) {
+  std::string boot_img = from_testdata_base("boot.img");
+  size_t boot_img_size;
+  std::string boot_img_sha1;
+  sha1sum(boot_img, &boot_img_sha1, &boot_img_size);
+
+  std::string recovery_img = from_testdata_base("recovery.img");
+  size_t recovery_img_size;
+  std::string recovery_img_sha1;
+  sha1sum(recovery_img, &recovery_img_sha1, &recovery_img_size);
+  std::string recovery_img_size_arg = std::to_string(recovery_img_size);
+
+  std::string bonus_file = from_testdata_base("bonus.file");
 
   // applypatch -b <bonus-file> <src-file> <tgt-file> <tgt-sha1> <tgt-size> \
-  //               <src-sha1-fake>:<patch1> <src-sha1>:<patch2>
-  TemporaryFile tmp3;
-  tgt_file = "EMMC:" + std::string(tmp3.path);
+  //            <src-sha1-fake1>:<patch1> <src-sha1>:<patch2> <src-sha1-fake2>:<patch3>
+  std::string src_file_arg =
+      "EMMC:" + boot_img + ":" + std::to_string(boot_img_size) + ":" + boot_img_sha1;
+  TemporaryFile tgt_file;
+  std::string tgt_file_arg = "EMMC:"s + tgt_file.path;
   std::string bad_sha1_a = android::base::StringPrintf("%040x", rand());
   std::string bad_sha1_b = android::base::StringPrintf("%040x", rand());
   std::string patch1 = bad_sha1_a + ":" + from_testdata_base("recovery-from-boot.p");
   std::string patch2 = boot_img_sha1 + ":" + from_testdata_base("recovery-from-boot.p");
   std::string patch3 = bad_sha1_b + ":" + from_testdata_base("recovery-from-boot.p");
-  std::vector<const char*> args3 = {
-    "applypatch",
-    "-b",
-    bonus_file.c_str(),
-    src_file.c_str(),
-    tgt_file.c_str(),
-    recovery_img_sha1.c_str(),
-    recovery_img_size.c_str(),
-    patch1.c_str(),
-    patch2.c_str(),
-    patch3.c_str()
-  };
-  ASSERT_EQ(0, applypatch_modes(args3.size(), args3.data()));
+  std::vector<const char*> args = { "applypatch",
+                                    "-b",
+                                    bonus_file.c_str(),
+                                    src_file_arg.c_str(),
+                                    tgt_file_arg.c_str(),
+                                    recovery_img_sha1.c_str(),
+                                    recovery_img_size_arg.c_str(),
+                                    patch1.c_str(),
+                                    patch2.c_str(),
+                                    patch3.c_str() };
+  ASSERT_EQ(0, applypatch_modes(args.size(), args.data()));
 }
 
 // Ensures that applypatch works with a bsdiff based recovery-from-boot.p.
diff --git a/tests/manual/recovery_test.cpp b/tests/manual/recovery_test.cpp
index 64e3b59..224ed5b 100644
--- a/tests/manual/recovery_test.cpp
+++ b/tests/manual/recovery_test.cpp
@@ -34,7 +34,6 @@
 static const std::string myFilename = "/data/misc/recovery/inject.txt";
 static const std::string myContent = "Hello World\nWelcome to my recovery\n";
 static const std::string kLocale = "zu";
-static const std::string kResourceTestDir = "/data/nativetest/recovery/";
 
 // Failure is expected on systems that do not deliver either the
 // recovery-persist or recovery-refresh executables. Tests also require
@@ -108,19 +107,20 @@
   return 1;
 }
 
-// Find out all png files to test under /data/nativetest/recovery/.
+// Find out all the PNG files to test, which stay under the same dir with the executable.
 static std::vector<std::string> add_files() {
+  std::string exec_dir = android::base::GetExecutableDirectory();
   std::vector<std::string> files;
-  for (const std::string& str : image_dir) {
-    std::string dir_path = kResourceTestDir + str;
+  for (const std::string& image : image_dir) {
+    std::string dir_path = exec_dir + "/" + image;
     dirent** namelist;
     int n = scandir(dir_path.c_str(), &namelist, png_filter, alphasort);
     if (n == -1) {
-      printf("Failed to scan dir %s: %s\n", kResourceTestDir.c_str(), strerror(errno));
+      printf("Failed to scan dir %s: %s\n", exec_dir.c_str(), strerror(errno));
       return files;
     }
     if (n == 0) {
-      printf("No file is added for test in %s\n", kResourceTestDir.c_str());
+      printf("No file is added for test in %s\n", exec_dir.c_str());
     }
 
     while (n--) {
diff --git a/tests/unit/screen_ui_test.cpp b/tests/unit/screen_ui_test.cpp
new file mode 100644
index 0000000..be6799f
--- /dev/null
+++ b/tests/unit/screen_ui_test.cpp
@@ -0,0 +1,198 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "screen_ui.h"
+
+#include <string>
+
+#include <gtest/gtest.h>
+
+constexpr const char* HEADER[] = { "header", nullptr };
+constexpr const char* ITEMS[] = { "items1", "items2", "items3", "items4", "1234567890", nullptr };
+
+TEST(ScreenUITest, StartPhoneMenuSmoke) {
+  Menu menu(false, 10, 20);
+  ASSERT_FALSE(menu.scrollable());
+
+  menu.Start(HEADER, ITEMS, 0);
+  ASSERT_EQ(HEADER[0], menu.text_headers()[0]);
+  ASSERT_EQ(5u, menu.ItemsCount());
+
+  std::string message;
+  ASSERT_FALSE(menu.ItemsOverflow(&message));
+  for (size_t i = 0; i < menu.ItemsCount(); i++) {
+    ASSERT_EQ(ITEMS[i], menu.TextItem(i));
+  }
+
+  ASSERT_EQ(0, menu.selection());
+}
+
+TEST(ScreenUITest, StartWearMenuSmoke) {
+  Menu menu(true, 10, 8);
+  ASSERT_TRUE(menu.scrollable());
+
+  menu.Start(HEADER, ITEMS, 1);
+  ASSERT_EQ(HEADER[0], menu.text_headers()[0]);
+  ASSERT_EQ(5u, menu.ItemsCount());
+
+  std::string message;
+  ASSERT_FALSE(menu.ItemsOverflow(&message));
+  for (size_t i = 0; i < menu.ItemsCount() - 1; i++) {
+    ASSERT_EQ(ITEMS[i], menu.TextItem(i));
+  }
+  // Test of the last item is truncated
+  ASSERT_EQ("12345678", menu.TextItem(4));
+  ASSERT_EQ(1, menu.selection());
+}
+
+TEST(ScreenUITest, StartPhoneMenuItemsOverflow) {
+  Menu menu(false, 1, 20);
+  ASSERT_FALSE(menu.scrollable());
+
+  menu.Start(HEADER, ITEMS, 0);
+  ASSERT_EQ(1u, menu.ItemsCount());
+
+  std::string message;
+  ASSERT_FALSE(menu.ItemsOverflow(&message));
+  for (size_t i = 0; i < menu.ItemsCount(); i++) {
+    ASSERT_EQ(ITEMS[i], menu.TextItem(i));
+  }
+
+  ASSERT_EQ(0u, menu.MenuStart());
+  ASSERT_EQ(1u, menu.MenuEnd());
+}
+
+TEST(ScreenUITest, StartWearMenuItemsOverflow) {
+  Menu menu(true, 1, 20);
+  ASSERT_TRUE(menu.scrollable());
+
+  menu.Start(HEADER, ITEMS, 0);
+  ASSERT_EQ(5u, menu.ItemsCount());
+
+  std::string message;
+  ASSERT_TRUE(menu.ItemsOverflow(&message));
+  ASSERT_EQ("Current item: 1/5", message);
+
+  for (size_t i = 0; i < menu.ItemsCount(); i++) {
+    ASSERT_EQ(ITEMS[i], menu.TextItem(i));
+  }
+
+  ASSERT_EQ(0u, menu.MenuStart());
+  ASSERT_EQ(1u, menu.MenuEnd());
+}
+
+TEST(ScreenUITest, PhoneMenuSelectSmoke) {
+  Menu menu(false, 10, 20);
+
+  int sel = 0;
+  menu.Start(HEADER, ITEMS, sel);
+  // Mimic down button 10 times (2 * items size)
+  for (int i = 0; i < 10; i++) {
+    sel = menu.Select(++sel);
+    ASSERT_EQ(sel, menu.selection());
+
+    // Wraps the selection for unscrollable menu when it reaches the boundary.
+    int expected = (i + 1) % 5;
+    ASSERT_EQ(expected, menu.selection());
+
+    ASSERT_EQ(0u, menu.MenuStart());
+    ASSERT_EQ(5u, menu.MenuEnd());
+  }
+
+  // Mimic up button 10 times
+  for (int i = 0; i < 10; i++) {
+    sel = menu.Select(--sel);
+    ASSERT_EQ(sel, menu.selection());
+
+    int expected = (9 - i) % 5;
+    ASSERT_EQ(expected, menu.selection());
+
+    ASSERT_EQ(0u, menu.MenuStart());
+    ASSERT_EQ(5u, menu.MenuEnd());
+  }
+}
+
+TEST(ScreenUITest, WearMenuSelectSmoke) {
+  Menu menu(true, 10, 20);
+
+  int sel = 0;
+  menu.Start(HEADER, ITEMS, sel);
+  // Mimic pressing down button 10 times (2 * items size)
+  for (int i = 0; i < 10; i++) {
+    sel = menu.Select(++sel);
+    ASSERT_EQ(sel, menu.selection());
+
+    // Stops the selection at the boundary if the menu is scrollable.
+    int expected = std::min(i + 1, 4);
+    ASSERT_EQ(expected, menu.selection());
+
+    ASSERT_EQ(0u, menu.MenuStart());
+    ASSERT_EQ(5u, menu.MenuEnd());
+  }
+
+  // Mimic pressing up button 10 times
+  for (int i = 0; i < 10; i++) {
+    sel = menu.Select(--sel);
+    ASSERT_EQ(sel, menu.selection());
+
+    int expected = std::max(3 - i, 0);
+    ASSERT_EQ(expected, menu.selection());
+
+    ASSERT_EQ(0u, menu.MenuStart());
+    ASSERT_EQ(5u, menu.MenuEnd());
+  }
+}
+
+TEST(ScreenUITest, WearMenuSelectItemsOverflow) {
+  Menu menu(true, 3, 20);
+
+  int sel = 1;
+  menu.Start(HEADER, ITEMS, sel);
+  ASSERT_EQ(5u, menu.ItemsCount());
+
+  // Scroll the menu to the end, and check the start & end of menu.
+  for (int i = 0; i < 3; i++) {
+    sel = menu.Select(++sel);
+    ASSERT_EQ(i + 2, sel);
+    ASSERT_EQ(static_cast<size_t>(i), menu.MenuStart());
+    ASSERT_EQ(static_cast<size_t>(i + 3), menu.MenuEnd());
+  }
+
+  // Press down button one more time won't change the MenuStart() and MenuEnd().
+  sel = menu.Select(++sel);
+  ASSERT_EQ(4, sel);
+  ASSERT_EQ(2u, menu.MenuStart());
+  ASSERT_EQ(5u, menu.MenuEnd());
+
+  // Scroll the menu to the top.
+  // The expected menu sel, start & ends are:
+  // sel 3, start 2, end 5
+  // sel 2, start 2, end 5
+  // sel 1, start 1, end 4
+  // sel 0, start 0, end 3
+  for (int i = 0; i < 4; i++) {
+    sel = menu.Select(--sel);
+    ASSERT_EQ(3 - i, sel);
+    ASSERT_EQ(static_cast<size_t>(std::min(3 - i, 2)), menu.MenuStart());
+    ASSERT_EQ(static_cast<size_t>(std::min(6 - i, 5)), menu.MenuEnd());
+  }
+
+  // Press up button one more time won't change the MenuStart() and MenuEnd().
+  sel = menu.Select(--sel);
+  ASSERT_EQ(0, sel);
+  ASSERT_EQ(0u, menu.MenuStart());
+  ASSERT_EQ(3u, menu.MenuEnd());
+}
diff --git a/uncrypt/uncrypt.cpp b/uncrypt/uncrypt.cpp
index bb43c2c..16036f9 100644
--- a/uncrypt/uncrypt.cpp
+++ b/uncrypt/uncrypt.cpp
@@ -172,14 +172,15 @@
     return fstab;
 }
 
-static const char* find_block_device(const char* path, bool* encryptable, bool* encrypted, bool *f2fs_fs) {
+static const char* find_block_device(const char* path, bool* encryptable,
+                                     bool* encrypted, bool* f2fs_fs) {
     // Look for a volume whose mount point is the prefix of path and
     // return its block device.  Set encrypted if it's currently
     // encrypted.
 
-    // ensure f2fs_fs is set to 0 first.
-    if (f2fs_fs)
-        *f2fs_fs = false;
+    // ensure f2fs_fs is set to false first.
+    *f2fs_fs = false;
+
     for (int i = 0; i < fstab->num_entries; ++i) {
         struct fstab_rec* v = &fstab->recs[i];
         if (!v->mount_point) {
@@ -196,8 +197,9 @@
                     *encrypted = true;
                 }
             }
-            if (f2fs_fs && strcmp(v->fs_type, "f2fs") == 0)
+            if (strcmp(v->fs_type, "f2fs") == 0) {
                 *f2fs_fs = true;
+            }
             return v->blk_device;
         }
     }
@@ -313,15 +315,29 @@
         }
     }
 
-#ifndef F2FS_IOC_SET_DONTMOVE
+// F2FS-specific ioctl
+// It requires the below kernel commit merged in v4.16-rc1.
+//   1ad71a27124c ("f2fs: add an ioctl to disable GC for specific file")
+// In android-4.4,
+//   56ee1e817908 ("f2fs: updates on v4.16-rc1")
+// In android-4.9,
+//   2f17e34672a8 ("f2fs: updates on v4.16-rc1")
+// In android-4.14,
+//   ce767d9a55bc ("f2fs: updates on v4.16-rc1")
+#ifndef F2FS_IOC_SET_PIN_FILE
 #ifndef F2FS_IOCTL_MAGIC
 #define F2FS_IOCTL_MAGIC		0xf5
 #endif
-#define F2FS_IOC_SET_DONTMOVE		_IO(F2FS_IOCTL_MAGIC, 13)
+#define F2FS_IOC_SET_PIN_FILE	_IOW(F2FS_IOCTL_MAGIC, 13, __u32)
+#define F2FS_IOC_GET_PIN_FILE	_IOW(F2FS_IOCTL_MAGIC, 14, __u32)
 #endif
-    if (f2fs_fs && ioctl(fd, F2FS_IOC_SET_DONTMOVE) < 0) {
-        PLOG(ERROR) << "Failed to set non-movable file for f2fs: " << path << " on " << blk_dev;
-        return kUncryptIoctlError;
+    if (f2fs_fs) {
+        int error = ioctl(fd, F2FS_IOC_SET_PIN_FILE);
+        // Don't break the old kernels which don't support it.
+        if (error && errno != ENOTTY && errno != ENOTSUP) {
+            PLOG(ERROR) << "Failed to set pin_file for f2fs: " << path << " on " << blk_dev;
+            return kUncryptIoctlError;
+        }
     }
 
     off64_t pos = 0;
diff --git a/wear_ui.cpp b/wear_ui.cpp
index ca6b1b1..118e435 100644
--- a/wear_ui.cpp
+++ b/wear_ui.cpp
@@ -17,7 +17,6 @@
 #include "wear_ui.h"
 
 #include <pthread.h>
-#include <stdio.h>  // TODO: Remove after killing the call to sprintf().
 #include <string.h>
 
 #include <string>
@@ -27,7 +26,8 @@
 #include <minui/minui.h>
 
 WearRecoveryUI::WearRecoveryUI()
-    : kProgressBarBaseline(RECOVERY_UI_PROGRESS_BAR_BASELINE),
+    : ScreenRecoveryUI(true),
+      kProgressBarBaseline(RECOVERY_UI_PROGRESS_BAR_BASELINE),
       kMenuUnusableRows(RECOVERY_UI_MENU_UNUSABLE_ROWS) {
   // TODO: kMenuUnusableRows should be computed based on the lines in draw_screen_locked().
 
@@ -65,13 +65,10 @@
   "Swipe up/down to move.",
   "Swipe left/right to select.",
   "",
-  NULL
+  nullptr,
 };
 
-// TODO merge drawing routines with screen_ui
 void WearRecoveryUI::draw_screen_locked() {
-  char cur_selection_str[50];
-
   draw_background_locked();
   if (!show_text) {
     draw_foreground_locked();
@@ -79,68 +76,7 @@
     SetColor(TEXT_FILL);
     gr_fill(0, 0, gr_fb_width(), gr_fb_height());
 
-    int y = kMarginHeight;
-    int x = kMarginWidth;
-    if (show_menu) {
-      std::string recovery_fingerprint =
-          android::base::GetProperty("ro.bootimage.build.fingerprint", "");
-      SetColor(HEADER);
-      y += DrawTextLine(x + 4, y, "Android Recovery", true);
-      for (auto& chunk : android::base::Split(recovery_fingerprint, ":")) {
-        y += DrawTextLine(x + 4, y, chunk.c_str(), false);
-      }
-
-      // This is actually the help strings.
-      y += DrawTextLines(x + 4, y, SWIPE_HELP);
-      SetColor(HEADER);
-      y += DrawTextLines(x + 4, y, menu_headers_);
-
-      // Show the current menu item number in relation to total number if
-      // items don't fit on the screen.
-      if (menu_items > menu_end - menu_start) {
-        sprintf(cur_selection_str, "Current item: %d/%d", menu_sel + 1, menu_items);
-        gr_text(gr_sys_font(), x + 4, y, cur_selection_str, 1);
-        y += char_height_ + 4;
-      }
-
-      // Menu begins here
-      SetColor(MENU);
-
-      for (int i = menu_start; i < menu_end; ++i) {
-        if (i == menu_sel) {
-          // draw the highlight bar
-          SetColor(MENU_SEL_BG);
-          gr_fill(x, y - 2, gr_fb_width() - x, y + char_height_ + 2);
-          // white text of selected item
-          SetColor(MENU_SEL_FG);
-          if (menu_[i][0]) {
-            gr_text(gr_sys_font(), x + 4, y, menu_[i].c_str(), 1);
-          }
-          SetColor(MENU);
-        } else if (menu_[i][0]) {
-          gr_text(gr_sys_font(), x + 4, y, menu_[i].c_str(), 0);
-        }
-        y += char_height_ + 4;
-      }
-      SetColor(MENU);
-      y += 4;
-      gr_fill(0, y, gr_fb_width(), y + 2);
-      y += 4;
-    }
-
-    SetColor(LOG);
-
-    // display from the bottom up, until we hit the top of the
-    // screen, the bottom of the menu, or we've displayed the
-    // entire text buffer.
-    int row = text_row_;
-    size_t count = 0;
-    for (int ty = gr_fb_height() - char_height_ - kMarginHeight; ty > y + 2 && count < text_rows_;
-         ty -= char_height_, ++count) {
-      gr_text(gr_sys_font(), x + 4, ty, text_[row], 0);
-      --row;
-      if (row < 0) row = text_rows_ - 1;
-    }
+    draw_menu_and_text_buffer_locked(SWIPE_HELP);
   }
 }
 
@@ -156,45 +92,11 @@
                                int initial_selection) {
   pthread_mutex_lock(&updateMutex);
   if (text_rows_ > 0 && text_cols_ > 0) {
-    menu_headers_ = headers;
-    menu_.clear();
-    // "i < text_rows_" is removed from the loop termination condition,
-    // which is different from the one in ScreenRecoveryUI::StartMenu().
-    // Because WearRecoveryUI supports scrollable menu, it's fine to have
-    // more entries than text_rows_. The menu may be truncated otherwise.
-    // Bug: 23752519
-    for (size_t i = 0; items[i] != nullptr; i++) {
-      menu_.emplace_back(std::string(items[i], strnlen(items[i], text_cols_ - 1)));
-    }
-    menu_items = static_cast<int>(menu_.size());
-    show_menu = true;
-    menu_sel = initial_selection;
-    menu_start = 0;
-    menu_end = text_rows_ - 1 - kMenuUnusableRows;
-    if (menu_items <= menu_end) menu_end = menu_items;
+    menu_ = std::make_unique<Menu>(scrollable_menu_, text_rows_ - kMenuUnusableRows - 1,
+                                   text_cols_ - 1);
+    menu_->Start(headers, items, initial_selection);
+
     update_screen_locked();
   }
   pthread_mutex_unlock(&updateMutex);
-}
-
-int WearRecoveryUI::SelectMenu(int sel) {
-  int old_sel;
-  pthread_mutex_lock(&updateMutex);
-  if (show_menu) {
-    old_sel = menu_sel;
-    menu_sel = sel;
-    if (menu_sel < 0) menu_sel = 0;
-    if (menu_sel >= menu_items) menu_sel = menu_items - 1;
-    if (menu_sel < menu_start) {
-      menu_start--;
-      menu_end--;
-    } else if (menu_sel >= menu_end && menu_sel < menu_items) {
-      menu_end++;
-      menu_start++;
-    }
-    sel = menu_sel;
-    if (menu_sel != old_sel) update_screen_locked();
-  }
-  pthread_mutex_unlock(&updateMutex);
-  return sel;
-}
+}
\ No newline at end of file
diff --git a/wear_ui.h b/wear_ui.h
index 739b4cb..8b24cb7 100644
--- a/wear_ui.h
+++ b/wear_ui.h
@@ -25,10 +25,8 @@
 
   void SetStage(int current, int max) override;
 
-  // menu display
   void StartMenu(const char* const* headers, const char* const* items,
                  int initial_selection) override;
-  int SelectMenu(int sel) override;
 
  protected:
   // progress bar vertical position, it's centered horizontally
@@ -45,8 +43,6 @@
  private:
   void draw_background_locked() override;
   void draw_screen_locked() override;
-
-  int menu_start, menu_end;
 };
 
 #endif  // RECOVERY_WEAR_UI_H