1 有源码给app添加水印

使用java可以适配更多的apk，如果使用koltin一些老的apk就会有适配问题
通过registerActivityLifecycleCallbacks拿到activity对象设置水印
在application里面registerActivityLifecycleCallbacks就行

static class MyActivityLifecycleCallbacks implements Application.ActivityLifecycleCallbacks {@Overridepublic void onActivityCreated(@NonNull Activity activity, @Nullable Bundle savedInstanceState) {android.util.Log.e("MyAppComponentFactory","onActivityCreated--------" + activity.getComponentName());activity.getWindow().getDecorView().postDelayed(new Runnable() {@Overridepublic void run() {showWatermarkView(activity);}}, 300);}@Overridepublic void onActivityStarted(@NonNull Activity activity) {}@Overridepublic void onActivityResumed(@NonNull Activity activity) {}@Overridepublic void onActivityPaused(@NonNull Activity activity) {}@Overridepublic void onActivityStopped(@NonNull Activity activity) {}@Overridepublic void onActivitySaveInstanceState(@NonNull Activity activity, @NonNull Bundle outState) {}@Overridepublic void onActivityDestroyed(@NonNull Activity activity) {}private void showWatermarkView(Activity activity) {ViewGroup decorView = activity.getWindow().getDecorView().findViewById(android.R.id.content);if (decorView.findViewWithTag("TOP_BG") == null) {ImageView topBg = new ImageView(activity);topBg.setTag("TOP_BG");topBg.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.MATCH_PARENT));topBg.setScaleType(ImageView.ScaleType.CENTER_CROP);
//                topBg.setBackground(new WaterMarkBgView(activity, Arrays.asList("Test"), -30, 14));topBg.setClickable(false);topBg.setFocusable(false);topBg.setFocusableInTouchMode(false);decorView.addView(topBg);}}}
}

无源码给apk添加

自定义AppComponentFactory并拿到application对象并调用registerActivityLifecycleCallbacks,

public class MyAppComponentFactory extends android.app.AppComponentFactory{@NonNullpublic Application instantiateApplication(ClassLoader cl, String className) throws InstantiationException, IllegalAccessException, ClassNotFoundException {Class<?> c = cl.loadClass(className);Application app = (Application) c.newInstance();app.registerActivityLifecycleCallbacks(new MyActivityLifecycleCallbacks());return app;}static class MyActivityLifecycleCallbacks implements Application.ActivityLifecycleCallbacks {@Overridepublic void onActivityCreated(@NonNull Activity activity, @Nullable Bundle savedInstanceState) {android.util.Log.e("MyAppComponentFactory","onActivityCreated--------" + activity.getComponentName());activity.getWindow().getDecorView().postDelayed(new Runnable() {@Overridepublic void run() {showWatermarkView(activity);}}, 300);}@Overridepublic void onActivityStarted(@NonNull Activity activity) {}@Overridepublic void onActivityResumed(@NonNull Activity activity) {}@Overridepublic void onActivityPaused(@NonNull Activity activity) {}@Overridepublic void onActivityStopped(@NonNull Activity activity) {}@Overridepublic void onActivitySaveInstanceState(@NonNull Activity activity, @NonNull Bundle outState) {}@Overridepublic void onActivityDestroyed(@NonNull Activity activity) {}private void showWatermarkView(Activity activity) {ViewGroup decorView = activity.getWindow().getDecorView().findViewById(android.R.id.content);if (decorView.findViewWithTag("TOP_BG") == null) {ImageView topBg = new ImageView(activity);topBg.setTag("TOP_BG");topBg.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.MATCH_PARENT));topBg.setScaleType(ImageView.ScaleType.CENTER_CROP);
//                topBg.setBackground(new WaterMarkBgView(activity, Arrays.asList("Test"), -30, 14));topBg.setClickable(false);topBg.setFocusable(false);topBg.setFocusableInTouchMode(false);decorView.addView(topBg);}}}
}

修改AndroidManifest application标签
android:appComponentFactory=".MyAppComponentFactory"回编译

直接修改smali文件

先把添加水印功能写到一个java文件中，然后编译得到.smali文件，把文件放到需要添加的apk翻遍后的代码中，找到Application类并在onCreate()中调用添加水印功能，这些步骤可以通过python完成