diff --git a/Android.mk b/Android.mk
index 93e658c..1350fba 100644
--- a/Android.mk
+++ b/Android.mk
@@ -47,54 +47,6 @@
 
 LOCAL_CFLAGS := $(recovery_common_cflags)
 
-ifneq ($(TARGET_RECOVERY_UI_MARGIN_HEIGHT),)
-LOCAL_CFLAGS += -DRECOVERY_UI_MARGIN_HEIGHT=$(TARGET_RECOVERY_UI_MARGIN_HEIGHT)
-else
-LOCAL_CFLAGS += -DRECOVERY_UI_MARGIN_HEIGHT=0
-endif
-
-ifneq ($(TARGET_RECOVERY_UI_MARGIN_WIDTH),)
-LOCAL_CFLAGS += -DRECOVERY_UI_MARGIN_WIDTH=$(TARGET_RECOVERY_UI_MARGIN_WIDTH)
-else
-LOCAL_CFLAGS += -DRECOVERY_UI_MARGIN_WIDTH=0
-endif
-
-ifneq ($(TARGET_RECOVERY_UI_TOUCH_LOW_THRESHOLD),)
-LOCAL_CFLAGS += -DRECOVERY_UI_TOUCH_LOW_THRESHOLD=$(TARGET_RECOVERY_UI_TOUCH_LOW_THRESHOLD)
-else
-LOCAL_CFLAGS += -DRECOVERY_UI_TOUCH_LOW_THRESHOLD=50
-endif
-
-ifneq ($(TARGET_RECOVERY_UI_TOUCH_HIGH_THRESHOLD),)
-LOCAL_CFLAGS += -DRECOVERY_UI_TOUCH_HIGH_THRESHOLD=$(TARGET_RECOVERY_UI_TOUCH_HIGH_THRESHOLD)
-else
-LOCAL_CFLAGS += -DRECOVERY_UI_TOUCH_HIGH_THRESHOLD=90
-endif
-
-ifneq ($(TARGET_RECOVERY_UI_PROGRESS_BAR_BASELINE),)
-LOCAL_CFLAGS += -DRECOVERY_UI_PROGRESS_BAR_BASELINE=$(TARGET_RECOVERY_UI_PROGRESS_BAR_BASELINE)
-else
-LOCAL_CFLAGS += -DRECOVERY_UI_PROGRESS_BAR_BASELINE=259
-endif
-
-ifneq ($(TARGET_RECOVERY_UI_ANIMATION_FPS),)
-LOCAL_CFLAGS += -DRECOVERY_UI_ANIMATION_FPS=$(TARGET_RECOVERY_UI_ANIMATION_FPS)
-else
-LOCAL_CFLAGS += -DRECOVERY_UI_ANIMATION_FPS=30
-endif
-
-ifneq ($(TARGET_RECOVERY_UI_MENU_UNUSABLE_ROWS),)
-LOCAL_CFLAGS += -DRECOVERY_UI_MENU_UNUSABLE_ROWS=$(TARGET_RECOVERY_UI_MENU_UNUSABLE_ROWS)
-else
-LOCAL_CFLAGS += -DRECOVERY_UI_MENU_UNUSABLE_ROWS=9
-endif
-
-ifneq ($(TARGET_RECOVERY_UI_VR_STEREO_OFFSET),)
-LOCAL_CFLAGS += -DRECOVERY_UI_VR_STEREO_OFFSET=$(TARGET_RECOVERY_UI_VR_STEREO_OFFSET)
-else
-LOCAL_CFLAGS += -DRECOVERY_UI_VR_STEREO_OFFSET=0
-endif
-
 include $(BUILD_STATIC_LIBRARY)
 
 librecovery_static_libraries := \
diff --git a/screen_ui.cpp b/screen_ui.cpp
index c14f29d..391dedb 100644
--- a/screen_ui.cpp
+++ b/screen_ui.cpp
@@ -142,11 +142,18 @@
 
 ScreenRecoveryUI::ScreenRecoveryUI() : ScreenRecoveryUI(false) {}
 
+constexpr int kDefaultMarginHeight = 0;
+constexpr int kDefaultMarginWidth = 0;
+constexpr int kDefaultAnimationFps = 30;
+
 ScreenRecoveryUI::ScreenRecoveryUI(bool scrollable_menu)
-    : kMarginWidth(RECOVERY_UI_MARGIN_WIDTH),
-      kMarginHeight(RECOVERY_UI_MARGIN_HEIGHT),
-      kAnimationFps(RECOVERY_UI_ANIMATION_FPS),
-      kDensity(static_cast<float>(android::base::GetIntProperty("ro.sf.lcd_density", 160)) / 160.f),
+    : margin_width_(
+          android::base::GetIntProperty("ro.recovery.ui.margin_width", kDefaultMarginWidth)),
+      margin_height_(
+          android::base::GetIntProperty("ro.recovery.ui.margin_height", kDefaultMarginHeight)),
+      animation_fps_(
+          android::base::GetIntProperty("ro.recovery.ui.animation_fps", kDefaultAnimationFps)),
+      density_(static_cast<float>(android::base::GetIntProperty("ro.sf.lcd_density", 160)) / 160.f),
       currentIcon(NONE),
       progressBarType(EMPTY),
       progressScopeStart(0),
@@ -203,7 +210,7 @@
 }
 
 int ScreenRecoveryUI::PixelsFromDp(int dp) const {
-  return dp * kDensity;
+  return dp * density_;
 }
 
 // Here's the intended layout:
@@ -258,7 +265,7 @@
       int stage_height = gr_get_height(stageMarkerEmpty);
       int stage_width = gr_get_width(stageMarkerEmpty);
       int x = (ScreenWidth() - max_stage * gr_get_width(stageMarkerEmpty)) / 2;
-      int y = ScreenHeight() - stage_height - kMarginHeight;
+      int y = ScreenHeight() - stage_height - margin_height_;
       for (int i = 0; i < max_stage; ++i) {
         GRSurface* stage_surface = (i < stage) ? stageMarkerFill : stageMarkerEmpty;
         DrawSurface(stage_surface, 0, 0, stage_width, stage_height, x, y);
@@ -373,8 +380,8 @@
   gr_color(0, 0, 0, 255);
   gr_clear();
 
-  int text_y = kMarginHeight;
-  int text_x = kMarginWidth;
+  int text_y = margin_height_;
+  int text_x = margin_width_;
   int line_spacing = gr_sys_font()->char_height;  // Put some extra space between images.
   // Write the header and descriptive texts.
   SetColor(INFO);
@@ -535,10 +542,10 @@
 // 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 std::vector<std::string>& help_message) {
-  int y = kMarginHeight;
+  int y = margin_height_;
   if (menu_) {
     static constexpr int kMenuIndent = 4;
-    int x = kMarginWidth + kMenuIndent;
+    int x = margin_width_ + kMenuIndent;
 
     SetColor(INFO);
 
@@ -594,9 +601,9 @@
   SetColor(LOG);
   int row = text_row_;
   size_t count = 0;
-  for (int ty = ScreenHeight() - kMarginHeight - char_height_; ty >= y && count < text_rows_;
+  for (int ty = ScreenHeight() - margin_height_ - char_height_; ty >= y && count < text_rows_;
        ty -= char_height_, ++count) {
-    DrawTextLine(kMarginWidth, ty, text_[row], false);
+    DrawTextLine(margin_width_, ty, text_[row], false);
     --row;
     if (row < 0) row = text_rows_ - 1;
   }
@@ -622,7 +629,7 @@
 }
 
 void ScreenRecoveryUI::ProgressThreadLoop() {
-  double interval = 1.0 / kAnimationFps;
+  double interval = 1.0 / animation_fps_;
   while (!progress_thread_stopped_) {
     double start = now();
     bool redraw = false;
@@ -708,8 +715,8 @@
     return false;
   }
   gr_font_size(gr_sys_font(), &char_width_, &char_height_);
-  text_rows_ = (ScreenHeight() - kMarginHeight * 2) / char_height_;
-  text_cols_ = (ScreenWidth() - kMarginWidth * 2) / char_width_;
+  text_rows_ = (ScreenHeight() - margin_height_ * 2) / char_height_;
+  text_cols_ = (ScreenWidth() - margin_width_ * 2) / char_width_;
   return true;
 }
 
diff --git a/screen_ui.h b/screen_ui.h
index b76d470..f08f4f4 100644
--- a/screen_ui.h
+++ b/screen_ui.h
@@ -158,14 +158,14 @@
  protected:
   // The margin that we don't want to use for showing texts (e.g. round screen, or screen with
   // rounded corners).
-  const int kMarginWidth;
-  const int kMarginHeight;
+  const int margin_width_;
+  const int margin_height_;
 
   // Number of frames per sec (default: 30) for both parts of the animation.
-  const int kAnimationFps;
+  const int animation_fps_;
 
   // The scale factor from dp to pixels. 1.0 for mdpi, 4.0 for xxxhdpi.
-  const float kDensity;
+  const float density_;
 
   virtual bool InitTextParams();
 
diff --git a/ui.cpp b/ui.cpp
index a2c160f..f1e30f5 100644
--- a/ui.cpp
+++ b/ui.cpp
@@ -34,6 +34,7 @@
 #include <android-base/file.h>
 #include <android-base/logging.h>
 #include <android-base/parseint.h>
+#include <android-base/properties.h>
 #include <android-base/strings.h>
 
 #include "minui/minui.h"
@@ -42,22 +43,26 @@
 
 using namespace std::chrono_literals;
 
-static constexpr int UI_WAIT_KEY_TIMEOUT_SEC = 120;
-static constexpr const char* BRIGHTNESS_FILE = "/sys/class/leds/lcd-backlight/brightness";
-static constexpr const char* MAX_BRIGHTNESS_FILE = "/sys/class/leds/lcd-backlight/max_brightness";
-static constexpr const char* BRIGHTNESS_FILE_SDM =
-    "/sys/class/backlight/panel0-backlight/brightness";
-static constexpr const char* MAX_BRIGHTNESS_FILE_SDM =
+constexpr int UI_WAIT_KEY_TIMEOUT_SEC = 120;
+constexpr const char* BRIGHTNESS_FILE = "/sys/class/leds/lcd-backlight/brightness";
+constexpr const char* MAX_BRIGHTNESS_FILE = "/sys/class/leds/lcd-backlight/max_brightness";
+constexpr const char* BRIGHTNESS_FILE_SDM = "/sys/class/backlight/panel0-backlight/brightness";
+constexpr const char* MAX_BRIGHTNESS_FILE_SDM =
     "/sys/class/backlight/panel0-backlight/max_brightness";
 
+constexpr int kDefaultTouchLowThreshold = 50;
+constexpr int kDefaultTouchHighThreshold = 90;
+
 RecoveryUI::RecoveryUI()
     : brightness_normal_(50),
       brightness_dimmed_(25),
       brightness_file_(BRIGHTNESS_FILE),
       max_brightness_file_(MAX_BRIGHTNESS_FILE),
       touch_screen_allowed_(false),
-      kTouchLowThreshold(RECOVERY_UI_TOUCH_LOW_THRESHOLD),
-      kTouchHighThreshold(RECOVERY_UI_TOUCH_HIGH_THRESHOLD),
+      touch_low_threshold_(android::base::GetIntProperty("ro.recovery.ui.touch_low_threshold",
+                                                         kDefaultTouchLowThreshold)),
+      touch_high_threshold_(android::base::GetIntProperty("ro.recovery.ui.touch_high_threshold",
+                                                          kDefaultTouchHighThreshold)),
       key_interrupted_(false),
       key_queue_len(0),
       key_last_down(-1),
@@ -178,15 +183,15 @@
   enum SwipeDirection { UP, DOWN, RIGHT, LEFT } direction;
 
   // We only consider a valid swipe if:
-  // - the delta along one axis is below kTouchLowThreshold;
-  // - and the delta along the other axis is beyond kTouchHighThreshold.
-  if (abs(dy) < kTouchLowThreshold && abs(dx) > kTouchHighThreshold) {
+  // - the delta along one axis is below touch_low_threshold_;
+  // - and the delta along the other axis is beyond touch_high_threshold_.
+  if (abs(dy) < touch_low_threshold_ && abs(dx) > touch_high_threshold_) {
     direction = dx < 0 ? SwipeDirection::LEFT : SwipeDirection::RIGHT;
-  } else if (abs(dx) < kTouchLowThreshold && abs(dy) > kTouchHighThreshold) {
+  } else if (abs(dx) < touch_low_threshold_ && abs(dy) > touch_high_threshold_) {
     direction = dy < 0 ? SwipeDirection::UP : SwipeDirection::DOWN;
   } else {
-    LOG(DEBUG) << "Ignored " << dx << " " << dy << " (low: " << kTouchLowThreshold
-               << ", high: " << kTouchHighThreshold << ")";
+    LOG(DEBUG) << "Ignored " << dx << " " << dy << " (low: " << touch_low_threshold_
+               << ", high: " << touch_high_threshold_ << ")";
     return;
   }
 
diff --git a/ui.h b/ui.h
index a1e18cc..e0fb13e 100644
--- a/ui.h
+++ b/ui.h
@@ -195,8 +195,8 @@
   };
 
   // The sensitivity when detecting a swipe.
-  const int kTouchLowThreshold;
-  const int kTouchHighThreshold;
+  const int touch_low_threshold_;
+  const int touch_high_threshold_;
 
   void OnKeyDetected(int key_code);
   void OnTouchDetected(int dx, int dy);
diff --git a/updater_sample/README.md b/updater_sample/README.md
index f6a2a04..306e71e 100644
--- a/updater_sample/README.md
+++ b/updater_sample/README.md
@@ -1,9 +1,8 @@
 # SystemUpdaterSample
 
 This app demonstrates how to use Android system updates APIs to install
-[OTA updates](https://source.android.com/devices/tech/ota/). It contains a sample
-client for `update_engine` to install A/B (seamless) updates and a sample of
-applying non-A/B updates using `recovery`.
+[OTA updates](https://source.android.com/devices/tech/ota/). It contains a
+sample client for `update_engine` to install A/B (seamless) updates.
 
 A/B (seamless) update is available since Android Nougat (API 24), but this sample
 targets the latest android.
@@ -180,7 +179,8 @@
 `update_engine` service as well as OTA package files. Detailed steps are as follows:
 
 1. [Prepare to build](https://source.android.com/setup/build/building)
-2. Add the module (SystemUpdaterSample) to the `PRODUCT_PACKAGES` list for the lunch target.
+2. Add the module (SystemUpdaterSample) to the `PRODUCT_PACKAGES` list for the
+   lunch target.
    e.g. add a line containing `PRODUCT_PACKAGES += SystemUpdaterSample`
    to `device/google/marlin/device-common.mk`.
 3. [Whitelist the sample app](https://source.android.com/devices/tech/config/perms-whitelist)
@@ -221,7 +221,6 @@
 - [x] Add smart update completion detection using onStatusUpdate
 - [x] Add pause/resume demo
 - [ ] Verify system partition checksum for package
-- [?] Add non-A/B updates demo
 
 
 ## Running tests
@@ -243,7 +242,8 @@
 
 ## Accessing `android.os.UpdateEngine` API
 
-`android.os.UpdateEngine`` APIs are marked as `@SystemApi`, meaning only system apps can access them.
+`android.os.UpdateEngine` APIs are marked as `@SystemApi`, meaning only system
+apps can access them.
 
 
 ## Getting read/write access to `/data/ota_package/`
diff --git a/vr_ui.cpp b/vr_ui.cpp
index b1ef646..a131a27 100644
--- a/vr_ui.cpp
+++ b/vr_ui.cpp
@@ -16,9 +16,15 @@
 
 #include "vr_ui.h"
 
-#include <minui/minui.h>
+#include <android-base/properties.h>
 
-VrRecoveryUI::VrRecoveryUI() : kStereoOffset(RECOVERY_UI_VR_STEREO_OFFSET) {}
+#include "minui/minui.h"
+
+constexpr int kDefaultStereoOffset = 0;
+
+VrRecoveryUI::VrRecoveryUI()
+    : stereo_offset_(
+          android::base::GetIntProperty("ro.recovery.ui.stereo_offset", kDefaultStereoOffset)) {}
 
 int VrRecoveryUI::ScreenWidth() const {
   return gr_fb_width() / 2;
@@ -30,36 +36,37 @@
 
 void VrRecoveryUI::DrawSurface(GRSurface* surface, int sx, int sy, int w, int h, int dx,
                                int dy) const {
-  gr_blit(surface, sx, sy, w, h, dx + kStereoOffset, dy);
-  gr_blit(surface, sx, sy, w, h, dx - kStereoOffset + ScreenWidth(), dy);
+  gr_blit(surface, sx, sy, w, h, dx + stereo_offset_, dy);
+  gr_blit(surface, sx, sy, w, h, dx - stereo_offset_ + ScreenWidth(), dy);
 }
 
 void VrRecoveryUI::DrawTextIcon(int x, int y, GRSurface* surface) const {
-  gr_texticon(x + kStereoOffset, y, surface);
-  gr_texticon(x - kStereoOffset + ScreenWidth(), y, surface);
+  gr_texticon(x + stereo_offset_, y, surface);
+  gr_texticon(x - stereo_offset_ + ScreenWidth(), y, surface);
 }
 
 int VrRecoveryUI::DrawTextLine(int x, int y, const std::string& line, bool bold) const {
-  gr_text(gr_sys_font(), x + kStereoOffset, y, line.c_str(), bold);
-  gr_text(gr_sys_font(), x - kStereoOffset + ScreenWidth(), y, line.c_str(), bold);
+  gr_text(gr_sys_font(), x + stereo_offset_, y, line.c_str(), bold);
+  gr_text(gr_sys_font(), x - stereo_offset_ + ScreenWidth(), y, line.c_str(), bold);
   return char_height_ + 4;
 }
 
 int VrRecoveryUI::DrawHorizontalRule(int y) const {
   y += 4;
-  gr_fill(kMarginWidth + kStereoOffset, y, ScreenWidth() - kMarginWidth + kStereoOffset, y + 2);
-  gr_fill(ScreenWidth() + kMarginWidth - kStereoOffset, y,
-          gr_fb_width() - kMarginWidth - kStereoOffset, y + 2);
+  gr_fill(margin_width_ + stereo_offset_, y, ScreenWidth() - margin_width_ + stereo_offset_, y + 2);
+  gr_fill(ScreenWidth() + margin_width_ - stereo_offset_, y,
+          gr_fb_width() - margin_width_ - stereo_offset_, y + 2);
   return y + 4;
 }
 
 void VrRecoveryUI::DrawHighlightBar(int /* x */, int y, int /* width */, int height) const {
-  gr_fill(kMarginWidth + kStereoOffset, y, ScreenWidth() - kMarginWidth + kStereoOffset, y + height);
-  gr_fill(ScreenWidth() + kMarginWidth - kStereoOffset, y,
-          gr_fb_width() - kMarginWidth - kStereoOffset, y + height);
+  gr_fill(margin_width_ + stereo_offset_, y, ScreenWidth() - margin_width_ + stereo_offset_,
+          y + height);
+  gr_fill(ScreenWidth() + margin_width_ - stereo_offset_, y,
+          gr_fb_width() - margin_width_ - stereo_offset_, y + height);
 }
 
 void VrRecoveryUI::DrawFill(int x, int y, int w, int h) const {
-  gr_fill(x + kStereoOffset, y, w, h);
-  gr_fill(x - kStereoOffset + ScreenWidth(), y, w, h);
+  gr_fill(x + stereo_offset_, y, w, h);
+  gr_fill(x - stereo_offset_ + ScreenWidth(), y, w, h);
 }
diff --git a/vr_ui.h b/vr_ui.h
index 08384ce..63c0f24 100644
--- a/vr_ui.h
+++ b/vr_ui.h
@@ -28,7 +28,7 @@
  protected:
   // Pixel offsets to move drawing functions to visible range.
   // Can vary per device depending on screen size and lens distortion.
-  const int kStereoOffset;
+  const int stereo_offset_;
 
   int ScreenWidth() const override;
   int ScreenHeight() const override;
diff --git a/wear_ui.cpp b/wear_ui.cpp
index f508236..3b057b7 100644
--- a/wear_ui.cpp
+++ b/wear_ui.cpp
@@ -25,17 +25,22 @@
 #include <android-base/strings.h>
 #include <minui/minui.h>
 
+constexpr int kDefaultProgressBarBaseline = 259;
+constexpr int kDefaultMenuUnusableRows = 9;
+
 WearRecoveryUI::WearRecoveryUI()
     : 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().
+      progress_bar_baseline_(android::base::GetIntProperty("ro.recovery.ui.progress_bar_baseline",
+                                                           kDefaultProgressBarBaseline)),
+      menu_unusable_rows_(android::base::GetIntProperty("ro.recovery.ui.menu_unusable_rows",
+                                                        kDefaultMenuUnusableRows)) {
+  // TODO: menu_unusable_rows_ should be computed based on the lines in draw_screen_locked().
 
   touch_screen_allowed_ = true;
 }
 
 int WearRecoveryUI::GetProgressBaseline() const {
-  return kProgressBarBaseline;
+  return progress_bar_baseline_;
 }
 
 // Draw background frame on the screen.  Does not flip pages.
@@ -94,7 +99,7 @@
                                const std::vector<std::string>& items, size_t initial_selection) {
   std::lock_guard<std::mutex> lg(updateMutex);
   if (text_rows_ > 0 && text_cols_ > 0) {
-    menu_ = std::make_unique<Menu>(scrollable_menu_, text_rows_ - kMenuUnusableRows - 1,
+    menu_ = std::make_unique<Menu>(scrollable_menu_, text_rows_ - menu_unusable_rows_ - 1,
                                    text_cols_ - 1, headers, items, initial_selection);
     update_screen_locked();
   }
diff --git a/wear_ui.h b/wear_ui.h
index c9a9f0e..b80cfd7 100644
--- a/wear_ui.h
+++ b/wear_ui.h
@@ -30,11 +30,11 @@
 
  protected:
   // progress bar vertical position, it's centered horizontally
-  const int kProgressBarBaseline;
+  const int progress_bar_baseline_;
 
   // Unusable rows when displaying the recovery menu, including the lines for headers (Android
   // Recovery, build id and etc) and the bottom lines that may otherwise go out of the screen.
-  const int kMenuUnusableRows;
+  const int menu_unusable_rows_;
 
   void StartMenu(const std::vector<std::string>& headers, const std::vector<std::string>& items,
                  size_t initial_selection) override;