diff --git a/Android.mk b/Android.mk
index 214d028..257f776 100644
--- a/Android.mk
+++ b/Android.mk
@@ -207,6 +207,5 @@
     $(LOCAL_PATH)/boot_control/Android.mk \
     $(LOCAL_PATH)/minui/Android.mk \
     $(LOCAL_PATH)/tests/Android.mk \
-    $(LOCAL_PATH)/tools/Android.mk \
     $(LOCAL_PATH)/updater/Android.mk \
     $(LOCAL_PATH)/updater_sample/Android.mk \
diff --git a/tools/Android.mk b/tools/Android.mk
deleted file mode 100644
index 6571161..0000000
--- a/tools/Android.mk
+++ /dev/null
@@ -1 +0,0 @@
-include $(all-subdir-makefiles)
diff --git a/tools/dumpkey/Android.bp b/tools/dumpkey/Android.bp
new file mode 100644
index 0000000..eb45e31
--- /dev/null
+++ b/tools/dumpkey/Android.bp
@@ -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.
+
+java_library_host {
+    name: "dumpkey",
+
+    manifest: "DumpPublicKey.mf",
+
+    srcs: [
+        "DumpPublicKey.java",
+    ],
+
+    static_libs: [
+        "bouncycastle-host",
+    ],
+}
diff --git a/tools/dumpkey/Android.mk b/tools/dumpkey/Android.mk
deleted file mode 100644
index 3154914..0000000
--- a/tools/dumpkey/Android.mk
+++ /dev/null
@@ -1,22 +0,0 @@
-# Copyright (C) 2008 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_MODULE := dumpkey
-LOCAL_SRC_FILES := DumpPublicKey.java
-LOCAL_JAR_MANIFEST := DumpPublicKey.mf
-LOCAL_STATIC_JAVA_LIBRARIES := bouncycastle-host
-include $(BUILD_HOST_JAVA_LIBRARY)
diff --git a/tools/recovery_l10n/Android.bp b/tools/recovery_l10n/Android.bp
new file mode 100644
index 0000000..d0a6d4b
--- /dev/null
+++ b/tools/recovery_l10n/Android.bp
@@ -0,0 +1,23 @@
+// 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.
+
+android_app {
+    name: "RecoveryLocalizer",
+
+    sdk_version: "current",
+
+    srcs: [
+        "src/**/*.java",
+    ],
+}
diff --git a/tools/recovery_l10n/Android.mk b/tools/recovery_l10n/Android.mk
deleted file mode 100644
index 7197c5c..0000000
--- a/tools/recovery_l10n/Android.mk
+++ /dev/null
@@ -1,13 +0,0 @@
-# Copyright 2012 Google Inc. All Rights Reserved.
-
-LOCAL_PATH := $(call my-dir)
-
-include $(CLEAR_VARS)
-
-LOCAL_PACKAGE_NAME := RecoveryLocalizer
-LOCAL_SDK_VERSION := current
-LOCAL_MODULE_TAGS := optional
-
-LOCAL_SRC_FILES := $(call all-java-files-under, src)
-
-include $(BUILD_PACKAGE)