ActivityLifecycleCallbacks 实现app中所有Activity实例查找

在Application中的onCreate()方法中进行注册
app.registerActivityLifecycleCallbacks(activityLifecycleCallbacks);

    public static void addActivityLifecyclerCallBacks(final HSPIndonesiaApplication app) {
        activityLifecycleCallbacks = new Application.ActivityLifecycleCallbacks() {
            @Override
            public void onActivityCreated(Activity activity, Bundle bundle) {

            }

            @Override
            public void onActivityStarted(Activity activity) {

            }

            @Override
            public void onActivityResumed(final Activity activity) {
                if (activity instanceof AdActivity) {
                    adActivity = activity;
                    handler.postDelayed(new Runnable() {
                        @Override
                        public void run() {
                            activity.finish();
                            handler.removeCallbacksAndMessages(null);
                            app.unregisterActivityLifecycleCallbacks(activityLifecycleCallbacks);

                        }
                    }, 4000);
                }
            }

            @Override
            public void onActivityPaused(Activity activity) {

            }

            @Override
            public void onActivityStopped(Activity activity) {

            }

            @Override
            public void onActivitySaveInstanceState(Activity activity, Bundle bundle) {

            }

            @Override
            public void onActivityDestroyed(Activity activity) {

            }
        };
        app.registerActivityLifecycleCallbacks(activityLifecycleCallbacks);
    }