3.1 中的 Android 应用程序中的视频流无法在 Google TV 上运行

Question

我是 Android 开发新手，我被要求在 Android 中为 Google TV 创建一个应用程序，该应用程序将向用户显示一些直播频道，并在用户选择一个频道时播放直播。我已经成功做到了并且工作正常。我使用 MediaPlayer 来播放我的流，并且频道在大多数情况下都能正常播放。

我已经重写了 setOnErrorListener 以了解是否有问题。这会捕获大多数错误（如果有），并在显示正确的消息后 finish() 玩家活动。

最初，当流准备就绪时，我在进度栏中向用户显示正在加载消息。在调用 setOnPreparedListener 侦听器后，我 dismiss() 进度条和 start() MediaPlayer 。

我无法运行 rtsp:// 流。玩一会儿后就挂了。

1. 进度条仍然在那里，应用程序有点卡住了。
2. 按 D-Pad 上的 后退 按钮不起作用，
3. 我在 setOnErrorListener 侦听器中根本没有收到任何错误
4. 我无法关闭应用程序，因为每当我单击应用程序的图标时，它就会打开相同的黑色“正在加载”播放器页面。

使用 Android 3.1 (API 12)，所有流 URL 均以 rtsp:// 开头

以下是 xml/java 文件的代码：

注意：I复制并更改了VideoPlayer.java & video_player.xml 文件 MediaPlayer_Demo 示例< /a>.

video_player.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#000000">

    <SurfaceView android:id="@+id/surface"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">
    </SurfaceView>
</LinearLayout>

错误的VideoPlayer.Java如下：

public class VideoPlayer extends Activity implements OnBufferingUpdateListener,
    OnCompletionListener, OnPreparedListener, OnVideoSizeChangedListener,
    SurfaceHolder.Callback, OnErrorListener {

private static final String TAG = "MediaPlayerDemo";
private int mVideoWidth;
private int mVideoHeight;
private MediaPlayer mMediaPlayer;
private SurfaceView mPreview;
private SurfaceHolder holder;
private Bundle extras;
private boolean mIsVideoSizeKnown = false;
private boolean mIsVideoReadyToBePlayed = false;
ProgressDialog progressDialog;

/**
 * 
 * Called when the activity is first created.
 */
@Override
public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.video_player);

    this.extras = getIntent().getExtras();

    mPreview = (SurfaceView) findViewById(R.id.surface);
    holder = mPreview.getHolder();
    holder.addCallback(this);
    holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

}

private void playVideo() {
    doCleanUp();
    try {

        this.progressDialog = ProgressDialog.show(this, "", "Loading...",
                true);

        // Check Internet Status
        if (!AppStatus.isInternetAvailable(this)) {
            showErrorToUser(getResources().getText(R.string.about_net)
                    .toString(),
                    "Internet connection is not available or Wi-Fi is not enabled.");
        } else {
            // Create a new media player and set the listeners
            String videoStreamUrl = extras.getString("streamUrl");

            if (videoStreamUrl != null) {
                mMediaPlayer = new MediaPlayer();
                mMediaPlayer.setDataSource(videoStreamUrl);
                mMediaPlayer.setDisplay(holder);
                mMediaPlayer.setOnBufferingUpdateListener(this);
                mMediaPlayer.setOnCompletionListener(this);
                mMediaPlayer.setOnPreparedListener(this);
                mMediaPlayer.setOnVideoSizeChangedListener(this);
                mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
                mMediaPlayer.setOnErrorListener(this);
                mMediaPlayer.prepareAsync();
            }
            else
            {
                showErrorToUser("Invalid Stream URI",
                        "The Video's URI is not valid. Please provide correct URI.");
            }
        }
    } catch (Exception e) {
        Log.e(TAG, "error: " + e.getMessage(), e);
        errorOccured();
    }
}

public void onBufferingUpdate(MediaPlayer arg0, int percent) {
    Log.d(TAG, "onBufferingUpdate percent:" + percent);

}

public void onCompletion(MediaPlayer arg0) {
    Log.d(TAG, "onCompletion called");
}

public void onVideoSizeChanged(MediaPlayer mp, int width, int height) {
    Log.v(TAG, "onVideoSizeChanged called");
    if (width == 0 || height == 0) {
        Log.e(TAG, "invalid video width(" + width + ") or height(" + height
                + ")");
        return;
    }
    mIsVideoSizeKnown = true;
    mVideoWidth = width;
    mVideoHeight = height;
    if (mIsVideoReadyToBePlayed && mIsVideoSizeKnown) {
        startVideoPlayback();
    }
}

public void onPrepared(MediaPlayer mediaplayer) {
    Log.d(TAG, "onPrepared called");
    mIsVideoReadyToBePlayed = true;
    if (mIsVideoReadyToBePlayed && mIsVideoSizeKnown) {
        startVideoPlayback();
    }
}

public void surfaceChanged(SurfaceHolder surfaceholder, int i, int j, int k) {
    Log.d(TAG, "surfaceChanged called");

}

public void surfaceDestroyed(SurfaceHolder surfaceholder) {
    Log.d(TAG, "surfaceDestroyed called");
}

public void surfaceCreated(SurfaceHolder holder) {
    Log.d(TAG, "surfaceCreated called");
    playVideo();
}

@Override
protected void onPause() {
    super.onPause();
    releaseMediaPlayer();
    doCleanUp();
}

@Override
protected void onStop() {
    super.onStop();
    releaseMediaPlayer();
    doCleanUp();
}

@Override
protected void onDestroy() {
    super.onDestroy();
    releaseMediaPlayer();
    doCleanUp();
}

private void releaseMediaPlayer() {
    if (mMediaPlayer != null) {
        mMediaPlayer.release();
        mMediaPlayer = null;
    }
}

private void doCleanUp() {
    mVideoWidth = 0;
    mVideoHeight = 0;
    mIsVideoReadyToBePlayed = false;
    mIsVideoSizeKnown = false;
}

private void startVideoPlayback() {
    Log.v(TAG, "startVideoPlayback");
    holder.setFixedSize(mVideoWidth, mVideoHeight);

    this.progressDialog.dismiss();

    mMediaPlayer.start();
}

public boolean onError(MediaPlayer arg0, int arg1, int arg2) {
    errorOccured();
    return true;
}

private void errorOccured() {
    UserMessage
            .showPopup(
                    this,
                    "Channel not available",
                    "We are sorry for the inconvenience but this channel is not available right now. Please try later.");
}

private void showErrorToUser(String title, String message) {
    // Hide Progress Bar
    this.progressDialog.dismiss();
    releaseMediaPlayer();
    doCleanUp();

    UserMessage.showPopup(this, title, message);
    }
}

我创建了UserMessage & AppStatus 类用于加快开发速度，我从 SO 那里学到了它们。这些课程很好，根据我的知识和经验，这些课程很好。理解，不会造成任何错误。我提供它们只是为了分享并更好地理解 VideoPlayer.java。

这些类如下只是为了分享，以便任何其他人都可以使用它们：

UserMessage.Java

public class UserMessage {
public static void showPopup(final Activity activity, String title, String message) {

    View view = View.inflate(activity, R.layout.about, null);
    TextView textView = (TextView) view.findViewById(R.id.message);
    textView.setMovementMethod(LinkMovementMethod.getInstance());
    textView.setText(message);
    new AlertDialog.Builder(activity)
            .setTitle(title)
            .setView(view)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    activity.finish();
                }
            }).show();
    }
}

AppStatus.Java

public class AppStatus {

public static boolean isInternetAvailable(Context context)  {               

    ConnectivityManager mgr = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo netInfo = mgr.getActiveNetworkInfo();

    return (netInfo != null && netInfo.isConnected() && netInfo.isAvailable());
    }
}

非常感谢任何帮助，因为我即将完成我的工作应用程序。

感谢您的阅读和思考，即使您无法回答我。

Answer 1

您的问题的答案是，虽然我们确实支持 RTSP，但它是通过软件而不是硬件完成的。当您需要重新缩放它时，这也可以在软件中完成。当您提供相当大的尺寸（例如您的尺寸）并且需要缩放时，它会运行不足。让你看到的行为。 MP4 是更好的解决方案。