ProcessLifecycleOwner监听应用程序生命周期

ProcessLifecycleOwner监听应用程序生命周期
他是针对整个应用程序的监听，与activity点数量无关。
Lifecycle.Event.ON_CREATE只会调用一次，Lifecycle.Event.ON_DESTROY永远不会调用。

public class MyApplicationObserver implements LifecycleObserver {
    
    

    private static final String TAG = "MyApplicationObserver";

    @OnLifecycleEvent(Lifecycle.Event.ON_CREATE)
    public void onCreate() {
    
    
        Log.d(TAG, "onCreate: Lifecycle.Event.ON_CREATE");
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_START)
    public void onStart() {
    
    
        Log.d(TAG, "onCreate: Lifecycle.Event.ON_START");
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
    public void onStop() {
    
    
        Log.d(TAG, "onCreate: Lifecycle.Event.ON_STOP");
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE)
    public void onPause() {
    
    
        Log.d(TAG, "onCreate: Lifecycle.Event.ON_PAUSE");
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_RESUME)
    public void onResume() {
    
    
        Log.d(TAG, "onCreate: Lifecycle.Event.ON_RESUME");
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
    public void onDestroy() {
    
    
        Log.d(TAG, "onCreate: Lifecycle.Event.ON_DESTROY");
    }
}

public class MyApplication extends Application {
    
    
    @Override
    public void onCreate() {
    
    
        super.onCreate();
        ProcessLifecycleOwner.get().getLifecycle().addObserver(new MyApplicationObserver());
    }

}

我们需要在AndroidManifest文件里添加 android:name=".MyApplication"。