android8.0 反射Application 启动过程

private void proxy(){        try{            //获取当前ActivityThread            Class ClassActivityThread=Class.forName("android.app.ActivityThread");            Method methodCurrentActivityThread=ClassActivityThread.getDeclaredMethod("currentActivityThread");            Object activityThread=methodCurrentActivityThread.invoke(null);            //获取当前ActivityThread的mInstrumentation字段            Field fieldmInstrumentation=ClassActivityThread.getDeclaredField("mInstrumentation");            fieldmInstrumentation.setAccessible(true);            Object mInstrumentation=fieldmInstrumentation.get(activityThread);            //构造LoadAPK 调用LoadedApk(ActivityThread, ApplicationInfo,            //                    CompatibilityInfo,ClassLoader,boolean,boolean,boolean)构造函数            Class ClassInstrumentation=Class.forName("android.app.Instrumentation");            Class ClassContextImpl= Class.forName("android.app.ContextImpl");            //loadAPK packageInfo            Class classLoadedApk= Class.forName("android.app.LoadedApk");            Class classCompatibilityInfo=Class.forName("android.content.res.CompatibilityInfo");            Field fieldDEFAULT_COMPATIBILITY_INFO=classCompatibilityInfo.getDeclaredField("DEFAULT_COMPATIBILITY_INFO");            Object DEFAULT_COMPATIBILITY_INFO=fieldDEFAULT_COMPATIBILITY_INFO.get(null);            UserHandle.class.getDeclaredMethod("myUserId").invoke(null);            Constructor constructor=classLoadedApk.getConstructor(ClassActivityThread, ApplicationInfo.class,                    classCompatibilityInfo,ClassLoader.class,boolean.class,boolean.class,boolean.class);            ApplicationInfo applicationInfo=this.getApplicationInfo();            applicationInfo.className="com.xx.xx.CustomApp";            Object loadAPK=constructor.newInstance(activityThread,applicationInfo,                    DEFAULT_COMPATIBILITY_INFO,this.getClassLoader(),false,true,false);            //执行创建Application            Method methodCreateAppContext=ClassContextImpl.getDeclaredMethod("createAppContext",ClassActivityThread,classLoadedApk);            methodCreateAppContext.setAccessible(true);            Object appContext =methodCreateAppContext.invoke(null,activityThread,loadAPK);            CustomApp globalApp= (CustomApp) ClassInstrumentation.getDeclaredMethod("newApplication",ClassLoader.class,String.class,                    Context.class).invoke(mInstrumentation,this.getClassLoader(),"com.xx.xx.CustomApp",appContext);            Field fieldAppication=classLoadedApk.getDeclaredField("mApplication");            fieldAppication.setAccessible(true);            fieldAppication.set(loadAPK,globalApp);            //调用onCreate()             globalApp.onCreate();            globalApp.setAttached(true);                    }catch (Exception e){            e.printStackTrace();        }        //globalApp.onCreate();    }
代码没有经过考验，仅供学习参考
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