設(shè)置LoadedApk中的mResDir
創(chuàng)建AssetManager, 設(shè)置資源包路徑
替換AssetManager

AssetManager newAssetManager = (AssetManager) AssetManager.class.getConstructor(new Class[0]).newInstance(new Object[0]); Method mAddAssetPath = AssetManager.class.getDeclaredMethod("addAssetPath",new Class[] {String.class}); mAddAssetPath.setAccessible(true); if (((Integer) mAddAssetPath.invoke(newAssetManager, new Object[] {externalResourceFile })).intValue() == 0) {throw new IllegalStateException("Could not create new AssetManager"); }Method mEnsureStringBlocks = AssetManager.class.getDeclaredMethod("ensureStringBlocks",new Class[0]); mEnsureStringBlocks.setAccessible(true); mEnsureStringBlocks.invoke(newAssetManager, new Object[0]);if (activities != null)for (Activity activity : activities) {Resources resources = activity.getResources();try {Field mAssets = Resources.class.getDeclaredField("mAssets");mAssets.setAccessible(true);mAssets.set(resources, newAssetManager);} catch (Throwable ignore) {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);}Resources.Theme theme = activity.getTheme();try {try {Field ma = Resources.Theme.class.getDeclaredField("mAssets");ma.setAccessible(true);ma.set(theme, newAssetManager);} catch (NoSuchFieldException ignore) {Field themeField = Resources.Theme.class.getDeclaredField("mThemeImpl");themeField.setAccessible(true);Object impl = themeField.get(theme);Field ma = impl.getClass().getDeclaredField("mAssets");ma.setAccessible(true);ma.set(impl, newAssetManager);}Field mt = ContextThemeWrapper.class.getDeclaredField("mTheme");mt.setAccessible(true);mt.set(activity, null);Method mtm = ContextThemeWrapper.class.getDeclaredMethod("initializeTheme",new Class[0]);mtm.setAccessible(true);mtm.invoke(activity, new Object[0]);Method mCreateTheme = AssetManager.class.getDeclaredMethod("createTheme",new Class[0]);mCreateTheme.setAccessible(true);Object internalTheme = mCreateTheme.invoke(newAssetManager, new Object[0]);Field mTheme = Resources.Theme.class.getDeclaredField("mTheme");mTheme.setAccessible(true);mTheme.set(theme, internalTheme);} catch (Throwable e) {Log.e("InstantRun","Failed to update existing theme for activity " + activity, e);}pruneResourceCaches(resources);}Collection references; if (Build.VERSION.SDK_INT >= 19) {Class resourcesManagerClass = Class.forName("android.app.ResourcesManager");Method mGetInstance = resourcesManagerClass.getDeclaredMethod("getInstance",new Class[0]);mGetInstance.setAccessible(true);Object resourcesManager = mGetInstance.invoke(null, new Object[0]);try {Field fMActiveResources = resourcesManagerClass.getDeclaredField("mActiveResources");fMActiveResources.setAccessible(true);ArrayMap arrayMap = (ArrayMap) fMActiveResources.get(resourcesManager);references = arrayMap.values();} catch (NoSuchFieldException ignore) {Field mResourceReferences = resourcesManagerClass.getDeclaredField("mResourceReferences");mResourceReferences.setAccessible(true);Collection references = (Collection) mResourceReferences.get(resourcesManager);} } else {Class activityThread = Class.forName("android.app.ActivityThread");Field fMActiveResources = activityThread.getDeclaredField("mActiveResources");fMActiveResources.setAccessible(true);Object thread = getActivityThread(context, activityThread);HashMap map = (HashMap) fMActiveResources.get(thread);references = map.values(); }for (WeakReference wr : references) {Resources resources = (Resources) wr.get();if (resources != null) {try {Field mAssets = Resources.class.getDeclaredField("mAssets");mAssets.setAccessible(true);mAssets.set(resources, newAssetManager);} catch (Throwable ignore) {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);}resources.updateConfiguration(resources.getConfiguration(),resources.getDisplayMetrics());} }

總結(jié)

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