如何在ReactContextBaseJavaModule中实现onPictureInPictureModeChanged回调

不能直接在ReactContextBaseJavaModule子类中覆写onPictureInPictureModeChanged方法实现对应逻辑，该回调是AppCompatActivity的生命周期方法，原生模块默认不持有该事件的监听能力，你可以通过以下方案实现需求：

实现步骤 #

1. 原生模块注册Activity生命周期监听 #

在你的ReactNativeBitmovinPlayerModule中注册Activity生命周期监听器，持有当前活跃的AppCompatActivity实例，避免后续操作空指针：

public class ReactNativeBitmovinPlayerModule extends ReactContextBaseJavaModule {
    private PlayerView playerView;
    private AppCompatActivity currentActivity;

    public ReactNativeBitmovinPlayerModule(ReactApplicationContext reactContext) {
        super(reactContext);
        // 注册Activity生命周期监听
        reactContext.addActivityLifecycleEventListener(new ActivityLifecycleEventListener() {
            @Override
            public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
                if (activity instanceof AppCompatActivity) {
                    currentActivity = (AppCompatActivity) activity;
                }
            }

            @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 outState) {}

            @Override
            public void onActivityDestroyed(Activity activity) {
                if (currentActivity == activity) {
                    currentActivity = null;
                }
            }
        });
    }
    // 其余原有代码保留
}

2. 宿主Activity转发画中画状态变更事件 #

只有承载播放器的Activity能收到onPictureInPictureModeChanged回调，你需要在Activity的对应回调中把事件转发给原生模块：

@Override
public void onPictureInPictureModeChanged(boolean isInPictureInPictureMode, Configuration newConfig) {
    super.onPictureInPictureModeChanged(isInPictureInPictureMode, newConfig);
    // 拿到原生模块实例转发事件
    ReactInstanceManager reactInstanceManager = getReactNativeHost().getReactInstanceManager();
    ReactContext reactContext = reactInstanceManager.getCurrentReactContext();
    if (reactContext != null) {
        ReactNativeBitmovinPlayerModule playerModule = reactContext.getNativeModule(ReactNativeBitmovinPlayerModule.class);
        if (playerModule != null) {
            playerModule.handlePictureInPictureModeChanged(isInPictureInPictureMode, newConfig);
        }
    }
}

3. 原生模块实现画中画状态处理逻辑 #

在原生模块中新增公开的状态处理方法，写入你需要实现的业务逻辑，也可以根据需要把状态同步给JS层：

public void handlePictureInPictureModeChanged(boolean isInPictureInPictureMode, Configuration newConfig) {
    if (currentActivity == null || playerView == null) {
        return;
    }
    // 原有业务逻辑
    if (isInPictureInPictureMode) {
        currentActivity.getSupportActionBar().hide();
    } else {
        currentActivity.getSupportActionBar().show();
    }
    playerView.onPictureInPictureModeChanged(isInPictureInPictureMode, newConfig);
    
    // 可选：同步状态到JS层
    WritableMap params = Arguments.createMap();
    params.putBoolean("isActive", isInPictureInPictureMode);
    getReactApplicationContext()
        .getJSModule(DeviceEventManagerModule.RCTDeviceEventEmitter.class)
        .emit("pipModeChanged", params);
}

注意事项 #

• 所有操作前都要对currentActivity、playerView等实例做空校验，避免空指针崩溃
• 需在AndroidManifest.xml中给对应Activity添加android:supportsPictureInPicture="true"配置，声明支持画中画能力
• 画中画功能仅支持Android 8.0（API level 26）及以上系统版本，低版本系统要做兼容降级处理

内容的提问来源于stack exchange，提问作者Jonathan Machado