Support Android 9.0, API 28

Author: galenlin

Android/DevSample/small/src/main/java/net/wequick/small/ApkBundleLauncher.java

@@ -163,6 +163,11 @@ public boolean handleMessage(Message msg) {
         }
 
         private void redirectActivityForP(Message msg) {
+            if (Build.VERSION.SDK_INT >= 28) {
+                // Following APIs cannot be called again since android 9.0.
+                return;
+            }
+
             Object/*android.app.servertransaction.ClientTransaction*/ t = msg.obj;
             List callbacks = ReflectAccelerator.getLaunchActivityItems(t);
             if (callbacks == null) return;
@@ -189,7 +194,7 @@ public void replace(ActivityInfo targetInfo) {
             });
         }
 
-        private void tryReplaceActivityInfo(Intent intent, ActivityInfoReplacer replacer) {
+        static void tryReplaceActivityInfo(Intent intent, ActivityInfoReplacer replacer) {
             if (intent == null) return;
 
             String targetClass = unwrapIntent(intent);
@@ -338,6 +343,20 @@ public ActivityResult execStartActivity(
                     who, contextThread, token, target, intent, requestCode);
         }
 
+        @Override
+        public Activity newActivity(ClassLoader cl, final String className, Intent intent) throws InstantiationException, IllegalAccessException, ClassNotFoundException {
+            final String[] targetClassName = {className};
+            if (Build.VERSION.SDK_INT >= 28) {
+                ActivityThreadHandlerCallback.tryReplaceActivityInfo(intent, new ActivityThreadHandlerCallback.ActivityInfoReplacer() {
+                    @Override
+                    public void replace(ActivityInfo info) {
+                        targetClassName[0] = info.targetActivity; // Redirect to the plugin activity
+                    }
+                });
+            }
+            return mBase.newActivity(cl, targetClassName[0], intent);
+        }
+
         @Override
         /** Prepare resources for REAL */
         public void callActivityOnCreate(Activity activity, android.os.Bundle icicle) {
@@ -1046,6 +1065,11 @@ public <T> T createObject(Bundle bundle, Context context, String type) {
      * @param ai
      */
     private static void applyActivityInfo(Activity activity, ActivityInfo ai) {
+        // Apply theme (9.0 only)
+        if (Build.VERSION.SDK_INT >= 28) {
+            ReflectAccelerator.resetResourcesAndTheme(activity, ai.getThemeResource());
+        }
+
         // Apply window attributes
         Window window = activity.getWindow();
         window.setSoftInputMode(ai.softInputMode);

Android/DevSample/small/src/main/java/net/wequick/small/util/ReflectAccelerator.java

@@ -30,6 +30,7 @@
 import android.os.Bundle;
 import android.os.IBinder;
 import android.util.ArrayMap;
+import android.view.ContextThemeWrapper;
 
 import java.io.File;
 import java.io.IOException;
@@ -187,7 +188,7 @@ private static Object makeDexElement(File pkg, boolean isDirectory, DexFile dexF
             }
             if (sDexElementConstructor == null) {
                 if (Build.VERSION.SDK_INT >= 26) {
-                    sDexElementConstructor = sDexElementClass.getConstructors()[1]; // (DexFile, File)
+                    sDexElementConstructor = sDexElementClass.getConstructor(new Class[]{DexFile.class, File.class});
                 } else {
                     sDexElementConstructor = sDexElementClass.getConstructors()[0];
                 }
@@ -465,12 +466,23 @@ public static int addAssetPath(AssetManager assets, String path) {
     }
 
     public static int[] addAssetPaths(AssetManager assets, String[] paths) {
-        if (sAssetManager_addAssetPaths_method == null) {
-            sAssetManager_addAssetPaths_method = getMethod(AssetManager.class,
-                    "addAssetPaths", new Class[]{String[].class});
+        if (Build.VERSION.SDK_INT < 28) {
+            if (sAssetManager_addAssetPaths_method == null) {
+                sAssetManager_addAssetPaths_method = getMethod(AssetManager.class,
+                        "addAssetPaths", new Class[]{String[].class});
+            }
+            if (sAssetManager_addAssetPaths_method == null) return null;
+            return invoke(sAssetManager_addAssetPaths_method, assets, new Object[]{paths});
+        } else {
+            // `AssetManager#addAssetPaths` becomes unavailable since android 9.0,
+            // use recursively `addAssetPath` instead.
+            int N = paths.length;
+            int[] ids = new int[N];
+            for (int i = 0; i < N; i++) {
+                ids[i] = addAssetPath(assets, paths[i]);
+            }
+            return ids;
         }
-        if (sAssetManager_addAssetPaths_method == null) return null;
-        return invoke(sAssetManager_addAssetPaths_method, assets, new Object[]{paths});
     }
 
     public static void mergeResources(Application app, Object activityThread, String[] assetPaths) {
@@ -484,9 +496,13 @@ public static void mergeResources(Application app, Object activityThread, String
         addAssetPaths(newAssetManager, assetPaths);
 
         try {
-            Method mEnsureStringBlocks = AssetManager.class.getDeclaredMethod("ensureStringBlocks", new Class[0]);
-            mEnsureStringBlocks.setAccessible(true);
-            mEnsureStringBlocks.invoke(newAssetManager, new Object[0]);
+            if (Build.VERSION.SDK_INT < 28) {
+                Method mEnsureStringBlocks = AssetManager.class.getDeclaredMethod("ensureStringBlocks", new Class[0]);
+                mEnsureStringBlocks.setAccessible(true);
+                mEnsureStringBlocks.invoke(newAssetManager, new Object[0]);
+            } else {
+                // `AssetManager#ensureStringBlocks` becomes unavailable since android 9.0
+            }
 
             Collection<WeakReference<Resources>> references;
 
@@ -737,6 +753,34 @@ public static Intent getIntentOfLaunchActivityItem(Object item) {
         return getValue(f, item);
     }
 
+    public static void resetResourcesAndTheme(Activity activity, int themeId) {
+        AssetManager newAssetManager = activity.getApplication().getAssets();
+        Resources resources = activity.getResources();
+
+        // Set the activity resources assets to the application one
+        try {
+            Field mResourcesImpl = Resources.class.getDeclaredField("mResourcesImpl");
+            mResourcesImpl.setAccessible(true);
+            Object resourceImpl = mResourcesImpl.get(resources);
+            Field implAssets = resourceImpl.getClass().getDeclaredField("mAssets");
+            implAssets.setAccessible(true);
+            implAssets.set(resourceImpl, newAssetManager);
+        } catch (Throwable e) {
+            android.util.Log.e("Small", "Failed to update resources for activity " + activity, e);
+        }
+
+        // Reset the theme
+        try {
+            Field mt = ContextThemeWrapper.class.getDeclaredField("mTheme");
+            mt.setAccessible(true);
+            mt.set(activity, null);
+        } catch (Throwable e) {
+            android.util.Log.e("Small", "Failed to update existing theme for activity " + activity, e);
+        }
+
+        activity.setTheme(themeId);
+    }
+
     //______________________________________________________________________________________________
     // Private