Question

如果我想在任何活动开始之前运行一些脚本，并且在所有活动停止之后，我会在android中放置这样的监听器吗？

我考虑过把它放在Android Application类中，只需将方法放在onCreate和onSaveInstanceState中 - 但我不确定它们会在所有活动之前和之后被调用< / p>

Answer 1

不幸的是，在Application类中，当应用程序停止时没有回调，但我认为你可以试试这段代码：

＆LT;＆LT;这里是旧代码＆gt;＆gt;

<强>更新：应用程序类代码：

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;
    }
}

在所有活动开始之前以及所有活动停止之后的监听器？

1 个答案: