Android build v1.1.5

android/app/build.gradle

@@ -7,8 +7,8 @@ android {
         applicationId "com.warren.iwanttoheal"
         minSdkVersion rootProject.ext.minSdkVersion
         targetSdkVersion rootProject.ext.targetSdkVersion
-        versionCode 83
-        versionName "1.1.4"
+        versionCode 84
+        versionName "1.1.5"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         aaptOptions {
              // Files and dirs to omit from the packaged assets dir, modified to accommodate modern web apps.

android/app/src/main/java/com/warren/iwanttoheal/AndroidDisplayPerformance.java

@@ -0,0 +1,51 @@
+package com.warren.iwanttoheal;
+
+import android.view.Display;
+import android.view.Window;
+import android.view.WindowManager;
+
+final class AndroidDisplayPerformance {
+
+    private static final float TARGET_REFRESH_RATE = 60.0f;
+
+    private AndroidDisplayPerformance() {}
+
+    static void preferBatteryRefreshRate(Window window, Display display) {
+        if (window == null || display == null) return;
+        Display.Mode currentMode = display.getMode();
+        Display.Mode selectedMode = closestBatteryMode(display, currentMode);
+        if (selectedMode == null) return;
+
+        WindowManager.LayoutParams attributes = window.getAttributes();
+        if (attributes.preferredDisplayModeId == selectedMode.getModeId()) return;
+        attributes.preferredDisplayModeId = selectedMode.getModeId();
+        window.setAttributes(attributes);
+    }
+
+    private static Display.Mode closestBatteryMode(Display display, Display.Mode currentMode) {
+        Display.Mode selectedMode = null;
+        float selectedScore = Float.MAX_VALUE;
+
+        for (Display.Mode mode : display.getSupportedModes()) {
+            if (
+                currentMode != null
+                    && (
+                        mode.getPhysicalWidth() != currentMode.getPhysicalWidth()
+                            || mode.getPhysicalHeight() != currentMode.getPhysicalHeight()
+                    )
+            ) {
+                continue;
+            }
+
+            float refreshRate = mode.getRefreshRate();
+            float score = Math.abs(refreshRate - TARGET_REFRESH_RATE);
+            if (refreshRate > TARGET_REFRESH_RATE + 0.5f) score += 1000.0f;
+            if (score < selectedScore) {
+                selectedMode = mode;
+                selectedScore = score;
+            }
+        }
+
+        return selectedMode;
+    }
+}

android/app/src/main/java/com/warren/iwanttoheal/ControllerBridgeActivity.java

@@ -1,6 +1,10 @@
 package com.warren.iwanttoheal;
 
 import android.content.Intent;
+import android.content.SharedPreferences;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
+import android.os.Build;
 import android.os.Bundle;
 import android.os.SystemClock;
 import android.view.KeyEvent;
@@ -12,15 +16,22 @@ import java.io.File;
 public abstract class ControllerBridgeActivity extends BridgeActivity {
 
     public static final String EXTRA_INITIAL_URL = "com.warren.iwanttoheal.INITIAL_URL";
+    private static final String PREFS_NAME = "com.warren.iwanttoheal.performance";
+    private static final String CACHE_CLEARED_VERSION_KEY = "webview_cache_cleared_version";
     private static final long DPAD_THROTTLE_MS = 220;
     private long lastDpadDispatchAt = 0;
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
-        clearWebViewServiceWorkers();
+        boolean shouldClearWebViewCache = shouldClearWebViewCacheForCurrentVersion();
+        if (shouldClearWebViewCache) clearWebViewServiceWorkers();
         super.onCreate(savedInstanceState);
+        AndroidDisplayPerformance.preferBatteryRefreshRate(getWindow(), getWindowManager().getDefaultDisplay());
         if (bridge != null) {
-            bridge.getWebView().clearCache(true);
+            if (shouldClearWebViewCache) {
+                bridge.getWebView().clearCache(true);
+                markWebViewCacheClearedForCurrentVersion();
+            }
         }
         loadIntentUrl();
     }
@@ -35,7 +46,13 @@ public abstract class ControllerBridgeActivity extends BridgeActivity {
     @Override
     public void onWindowFocusChanged(boolean hasFocus) {
         super.onWindowFocusChanged(hasFocus);
-        if (hasFocus) enableImmersiveMode();
+        if (hasFocus) {
+            enableImmersiveMode();
+            AndroidDisplayPerformance.preferBatteryRefreshRate(
+                getWindow(),
+                getWindowManager().getDefaultDisplay()
+            );
+        }
     }
 
     @Override
@@ -74,6 +91,34 @@ public abstract class ControllerBridgeActivity extends BridgeActivity {
         deleteIfExists(new File(webViewData, "Service Worker"));
     }
 
+    private boolean shouldClearWebViewCacheForCurrentVersion() {
+        return performancePreferences().getLong(CACHE_CLEARED_VERSION_KEY, -1L)
+            != currentVersionCode();
+    }
+
+    private void markWebViewCacheClearedForCurrentVersion() {
+        performancePreferences()
+            .edit()
+            .putLong(CACHE_CLEARED_VERSION_KEY, currentVersionCode())
+            .apply();
+    }
+
+    private SharedPreferences performancePreferences() {
+        return getSharedPreferences(PREFS_NAME, MODE_PRIVATE);
+    }
+
+    private long currentVersionCode() {
+        try {
+            PackageInfo packageInfo = getPackageManager().getPackageInfo(getPackageName(), 0);
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
+                return packageInfo.getLongVersionCode();
+            }
+            return packageInfo.versionCode;
+        } catch (PackageManager.NameNotFoundException exception) {
+            return -1L;
+        }
+    }
+
     private void deleteIfExists(File file) {
         if (!file.exists()) return;
         if (file.isDirectory()) {

android/app/src/main/java/com/warren/iwanttoheal/DualScreenPlugin.java

@@ -259,9 +259,11 @@ public class DualScreenPlugin extends Plugin {
     private final class TopDisplayPresentation extends Presentation {
 
         private final String initialUrl;
+        private final Display display;
 
         TopDisplayPresentation(Context context, Display display, String initialUrl) {
             super(context, display);
+            this.display = display;
             this.initialUrl = initialUrl;
         }
 
@@ -277,6 +279,7 @@ public class DualScreenPlugin extends Plugin {
                     | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                     | View.SYSTEM_UI_FLAG_LAYOUT_STABLE
             );
+            AndroidDisplayPerformance.preferBatteryRefreshRate(getWindow(), display);
 
             FrameLayout container = new FrameLayout(getContext());
             container.setBackgroundColor(Color.BLACK);