如何在 android 中获取摘要 activity 的生命周期

Question

我有一个视频播放器应用程序，我需要从 Android 中的另一个 class 访问摘要 activity 的生命周期。在我的摘要 activity 中，我尝试使用 LifecycleRegistry，但这让我成为了生命周期所有者，而不是摘要 class 的实际生命周期。如何从另一个 class 访问抽象 activity 的生命周期？

这是我的摘要activity:

abstract public class MainActivity extends AppCompatActivity {

    private LifecycleRegistry lifecycleRegistry;
    VideoPlayer videoPlayer;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        lifecycleRegistry = new LifecycleRegistry(this);
        lifecycleRegistry.setCurrentState(Lifecycle.State.CREATED);
        setContentView(R.layout.activity_main);
        videoPlayer = new VideoPlayer();
        playVideo();
    }

    public void playVideo(){
        videoPlayer.init();
        //calls function in VideoPlayer class
    }

    @Override
    protected void onResume() {
        super.onResume();
        lifecycleRegistry.setCurrentState(Lifecycle.State.RESUMED);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        lifecycleRegistry.setCurrentState(Lifecycle.State.DESTROYED);
    }
}

这是 class 我需要获取抽象 MainActivity 生命周期的地方：

public class VideoPlayer {
    public void init() {
        playVideo();
    }

    public void playVideo() {
        //async call happens here, I need getLifeCycle() from MainActivity
    }
}

Answer 1

不知道你未来的背景，但你可以做某事

public class VideoPlayer {

    private Lifecycle mLifecycle;
    
    public VideoPlayer(Lifecycle lifecycle) {
       mLifecycle = lifecycle;
    }

    public void init() {
        playVideo();
    }

    public void playVideo() {
        //you have mLifecycle now
    }
}

在Activity

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ...
        videoPlayer = new VideoPlayer(getLifecycle());
    }

如何在 android 中获取摘要 activity 的生命周期

how to get lifecycle of abstract activity in android

java

android

activity-lifecycle