android 监听每个activity的状态

在application 调用registerActivityLifecycleCallbacks()方法

//下面就是对应的生命周期
每个回调都有一个activity，这个activity就是当前的activity

registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks(){
        @Override
        public void onActivityCreated(Activity activity, Bundle savedInstanceState) {

        }

        @Override
        public void onActivityStarted(Activity activity) {
    
        }

        @Override
        public void onActivityResumed(Activity activity) {

        }

        @Override
        public void onActivityPaused(Activity activity) {

        }

        @Override
        public void onActivityStopped(Activity activity) {
          
        }

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

        }

        @Override
        public void onActivityDestroyed(Activity activity) {

        }

})