java - 所有 Activity 开始之前和所有 Activity 停止之后的监听器？

Question

如果我想在任何 Activity 开始之前和所有 Activity 停止之后运行一些脚本，我应该在android中哪里放置这样的监听器？

我考虑过将其放入 Android Application 类中，并简单地将方法放入其 onCreate 和 onSaveInstanceState 中 - 但我不确定他们在所有 Activity 之前和之后都会接到电话

Answer 1

不幸的是，在应用程序类中，当应用程序停止时没有回调，但我认为您可以尝试以下代码:

<<这是旧>

更新:Application类代码:

public class MyApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();
        startService(new Intent(this, Monitor.class));
    }
}

后台服务代码:

public class Monitor extends Service implements Application.ActivityLifecycleCallbacks {

    private static final String TAG = "Monitor";

    int mActivitiesCount = 1; // At the moment when service started, the main Activity is already opened

    public Monitor() {
    }

    @Override
    public void onCreate() {
        super.onCreate();
        getApplication().registerActivityLifecycleCallbacks(this);
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        return START_STICKY;
    }

    @Override
    public void onDestroy() {
        getApplication().unregisterActivityLifecycleCallbacks(this);
        super.onDestroy();
    }

    @Override
    public void onActivityCreated(Activity activity, Bundle bundle) {
        mActivitiesCount++;
        Log.d(TAG, "onActivityCreated: count: " + mActivitiesCount);
    }

    @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 bundle) {

    }

    @Override
    public void onActivityDestroyed(Activity activity) {
        mActivitiesCount--;
        Log.d(TAG, "onActivityDestroyed: count: " + mActivitiesCount);
        if (mActivitiesCount == 0) {
            Log.d(TAG, "All activities was destroyed");
            // do something
        }
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
}