使用ActivityLifecycleCallbacks自动记录Android生命周期事件？

Question

我正在尝试使用ActivityLifecycleCallbacks自动捕获和记录Android生命周期事件，但是至少可以说，有关此问题的文档非常少：

    public void registerActivityLifecycleCallbacks (Application.ActivityLifecycleCallbacks callback)

我不想扩展Activity类或重写现有的生命周期方法（onCreate，onResume等）。我希望有一个单独的类来监听这些事件并采取相应的行动。

有没有人在这方面有任何经验，或者有链接到有效的可靠文档或教程？具体来说，如何注册ActivityLifecycleCallbacks，以及如何处理它们？

Answer 1

我对做了自己的实现Application.ActivityLifecycleCallbacks。我正在使用SherlockActivity，但对于正常的Activity类可能有效。

首先，我正在创建一个接口，该接口具有用于跟踪活动生命周期的所有方法：

public interface ActivityLifecycleCallbacks{
    public void onActivityStopped(Activity activity);
    public void onActivityStarted(Activity activity);
    public void onActivitySaveInstanceState(Activity activity, Bundle outState);
    public void onActivityResumed(Activity activity);
    public void onActivityPaused(Activity activity);
    public void onActivityDestroyed(Activity activity);
    public void onActivityCreated(Activity activity, Bundle savedInstanceState);
}

其次，我在应用程序的类中实现了此接口：

public class MyApplication extends Application implements my.package.ActivityLifecycleCallbacks{

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

    @Override
    public void onActivityStopped(Activity activity) {
        Log.i("Tracking Activity Stopped", activity.getLocalClassName());

    }

    @Override
    public void onActivityStarted(Activity activity) {
        Log.i("Tracking Activity Started", activity.getLocalClassName());

    }

    @Override
    public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
        Log.i("Tracking Activity SaveInstanceState", activity.getLocalClassName());
    }

    @Override
    public void onActivityResumed(Activity activity) {
        Log.i("Tracking Activity Resumed", activity.getLocalClassName());
    }

    @Override
    public void onActivityPaused(Activity activity) {
        Log.i("Tracking Activity Paused", activity.getLocalClassName());
    }

    @Override
    public void onActivityDestroyed(Activity activity) {
        Log.i("Tracking Activity Destroyed", activity.getLocalClassName());
    }

    @Override
    public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
        Log.i("Tracking Activity Created", activity.getLocalClassName());
    }
}

第三，我正在创建一个继承自SherlockActivity的类：

public class MySherlockActivity extends SherlockActivity {

    protected MyApplication nMyApplication;

    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        nMyApplication = (MyApplication) getApplication();
        nMyApplication.onActivityCreated(this, savedInstanceState);
    }

    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        nMyApplication.onActivityResumed(this);
    }

    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
        nMyApplication.onActivityPaused(this);
    }

    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        nMyApplication.onActivityDestroyed(this);
    }

    @Override
    protected void onStart() {
        super.onStart();
        nMyApplication.onActivityStarted(this);
    }

    @Override
    protected void onStop() {
        super.onStop();
        nMyApplication.onActivityStopped(this);
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        nMyApplication.onActivitySaveInstanceState(this, outState);
    }   
}

第四，所有从SherlockActivity扩展的类，我都替换为MySherlockActivity：

public class MainActivity extends MySherlockActivity{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }

}

现在，在logcat中，您将看到My​​Application中实现的Interface实现中编程的日志。

更新

此实现已通过API级别9（姜饼），API级别12（蜂窝）和API级别17（果冻豆）进行了测试，并且运行良好。可能适用于Android的旧版本。