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海蘭，我有一個視頻播放器下面的代碼，現在我已經看過了這個互聯網上的錯誤，並在計算器上，有的人說這個錯誤，是因爲路徑不正確。但我已經嘗試過多個鏈接，而且都沒有工作。 這是我的應用中的活動代碼：視頻播放器不能播放，只有黑屏
public class VideoPlayerActivity extends Activity implements Callback, OnBufferingUpdateListener, OnPreparedListener, OnCompletionListener, OnVideoSizeChangedListener, OnErrorListener, OnSeekCompleteListener {
MediaPlayer mMediaPlayer;
Button startButton;
Button stopButton;
SurfaceView mPreview;
private SurfaceHolder holder;
public String TAG = "VideoPlayerActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.video_player_layout);
startButton = (Button) findViewById(R.id.start);
stopButton = (Button) findViewById(R.id.stop);
mMediaPlayer = new MediaPlayer();
startButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (mMediaPlayer != null) {
if (mMediaPlayer.isPlaying()) {
Log.d(TAG, "pause");
mMediaPlayer.pause();
startButton.setText("Start");
} else {
Log.d(TAG, "Start");
setVideoPlayback();
}
}
}
});
}
@Override
protected void onDestroy() {
Log.d(TAG, "Ondestroy");
releaseMediaPlayer();
super.onDestroy();
}
private void releaseMediaPlayer() {
Log.d(TAG, "releasemediaplayer");
if (mMediaPlayer != null) {
mMediaPlayer.release();
mMediaPlayer = null;
}
}
private void startVideoPlayback() {
Log.d(TAG, "StartVideoPlayback");
if (holder.getSurface() == null) {
Log.d(TAG, "holder sufrace null");
setSurfaceHolder();
}
if (mMediaPlayer.isPlaying()) {
mMediaPlayer.pause();
} else {
mMediaPlayer.start();
startButton.setText("Pause");
}
}
private void playVideo(Uri path_to_play) {
Log.d(TAG, "playvideo");
if ((path_to_play == null) || path_to_play.equals("")) {
Log.d(TAG, "pathtoplay is null");
return;
}
releaseMediaPlayer();
mMediaPlayer = new MediaPlayer();
// mMediaPlayer = MediaPlayer.create(this, path_to_play);
try {
setSurfaceHolder();
try {
Log.d(TAG, "pathtoplay is " + path_to_play);
mMediaPlayer.setDataSource(path_to_play.toString());
if ((holder != null) && (holder.getClass() != null) && holder.getSurface().isValid()) {
Log.d(TAG, "set holder to mediaplayer");
mMediaPlayer.setDisplay(holder);
} else {
setSurfaceHolder();
Log.d(TAG, "setsurface holder from play video");
}
mMediaPlayer.setOnBufferingUpdateListener(this);
mMediaPlayer.setOnPreparedListener(this);
mMediaPlayer.setOnCompletionListener(this);
mMediaPlayer.setOnVideoSizeChangedListener(this);
mMediaPlayer.setOnErrorListener(this);
mMediaPlayer.setOnSeekCompleteListener(this);
mMediaPlayer.prepareAsync();
} catch (Exception e) {
Log.e(TAG, "playvideo exception:" + e);
}
try {
mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
} catch (NullPointerException e) {
Log.e(TAG, "playvideo exception2:" + e);
}
} catch (Exception e) {
Log.e(TAG, "playvideo exception3:" + e);
}
}
@Override
public void onSeekComplete(MediaPlayer arg0) {
Log.d(TAG, "@onSeekComplete");
try {
if (holder.getSurface().isValid()) {
Log.d("error", "@onSeekComplete is valid");
if (mMediaPlayer != null) {
mMediaPlayer.setDisplay(holder);
}
} else {
Log.d(TAG, "@onSeekComplete else");
setSurfaceHolder();
if (mMediaPlayer != null) {
mMediaPlayer.setDisplay(holder);
}
}
mMediaPlayer.start();
} catch (Exception e) {
Log.e(TAG, e.getMessage(), e);
}
}
@SuppressLint("NewApi")
private void setSurfaceHolder() {
Log.d(TAG, "set surface holder");
mPreview = (SurfaceView) findViewById(R.id.surface);
mPreview.setVisibility(View.INVISIBLE);
mPreview.setFitsSystemWindows(true);
setDisplayForHolder();
}
public void setDisplayForHolder() {
Log.d(TAG, "set displat for surface holder");
if (mPreview == null) {
Log.d(TAG, "mpreview null");
return;
} else if (mPreview.getHolder() == null) {
Log.d(TAG, "mpreview.getholder = null");
return;
}
mPreview.getHolder().setFixedSize(720, 480);
holder = mPreview.getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
mPreview.setVisibility(View.VISIBLE);
}
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
Log.e(TAG, "MediaPlayer.onError() WHAT: " + what + "EXTRA: " + extra);
if (what == MediaPlayer.MEDIA_ERROR_SERVER_DIED) {
mMediaPlayer.release();
mMediaPlayer = null;
Log.e(TAG, "Media Error, Server Died " + extra);
} else if (what == MediaPlayer.MEDIA_ERROR_UNKNOWN) {
Log.e(TAG, "Media Error, Error Unknown " + extra);
}
return false;
}
@Override
public void onVideoSizeChanged(MediaPlayer mp, int width, int height) {
Log.d(TAG, "onvideoChanged");
if ((width == 0) || (height == 0)) {
mp.release();
setVideoPlayback();
startVideoPlayback();
return;
}
}
@Override
public void onCompletion(MediaPlayer arg0) {
// TODO Auto-generated method stub
}
@Override
public void onPrepared(MediaPlayer arg0) {
Log.d(TAG, "onprepared");
startVideoPlayback();
}
@Override
public void onBufferingUpdate(MediaPlayer arg0, int arg1) {
// TODO Auto-generated method stub
}
@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
Log.d(TAG, "surface changed");
Handler han = new Handler();
han.postDelayed(new Runnable() {
@Override
public void run() {
setVideoPlayback();
}
}, 1000);
}
@Override
public void surfaceCreated(SurfaceHolder arg0) {
// TODO Auto-generated method stub
}
@Override
public void surfaceDestroyed(SurfaceHolder arg0) {
// TODO Auto-generated method stub
}
private void setVideoPlayback() {
Log.d(TAG, "set video playback");
releaseMediaPlayer();
String path = "http://www.youtube.com/watch?v=U4dK9yodrsk";
Uri url = Uri.parse(path);
playVideo(url);
startButton.setText("Pause");
}
}
現在的logcat說以下內容：
06-26 14:31:45.528: D/VideoPlayerActivity(15678): Start
06-26 14:31:45.528: D/VideoPlayerActivity(15678): set video playback
06-26 14:31:45.528: D/VideoPlayerActivity(15678): releasemediaplayer
06-26 14:31:45.528: D/MediaPlayer(15678): release() in
06-26 14:31:45.538: D/MediaPlayer(15678): release() out
06-26 14:31:45.538: D/VideoPlayerActivity(15678): playvideo
06-26 14:31:45.538: D/VideoPlayerActivity(15678): releasemediaplayer
06-26 14:31:45.538: D/VideoPlayerActivity(15678): set surface holder
06-26 14:31:45.538: D/VideoPlayerActivity(15678): set displat for surface holder
06-26 14:31:45.548: D/VideoPlayerActivity(15678): surface changed
06-26 14:31:45.548: D/VideoPlayerActivity(15678): pathtoplay is http://www.youtube.com/watch?v=U4dK9yodrsk
06-26 14:31:45.548: I/MediaPlayer(15678): This is not a sprint project
06-26 14:31:45.548: D/MediaPlayer(15678): [DLNA]AP force disable DLNA: FALSE
06-26 14:31:45.558: D/MediaPlayer(15678): [DLNA]Force disable DLNA:
06-26 14:31:45.568: D/VideoPlayerActivity(15678): set holder to mediaplayer
06-26 14:31:45.568: D/MediaPlayer(15678): [DLNA]setDisplay
06-26 14:31:45.568: I/MediaPlayer(15678): setLPAflag() in
06-26 14:31:45.568: I/MediaPlayer(15678): mContext is null, can't getMirrorDisplayStatus!!!
06-26 14:31:45.568: I/MediaPlayer(15678): setLPAflag() out
06-26 14:31:46.409: E/MediaPlayer(15678): error (1, -2147483648)
06-26 14:31:46.409: D/MediaPlayer(15678): Mediaplayer receives message, message type: 100
06-26 14:31:46.409: E/MediaPlayer(15678): Error (1,-2147483648)
06-26 14:31:46.419: E/VideoPlayerActivity(15678): MediaPlayer.onError() WHAT: 1EXTRA: -2147483648
06-26 14:31:46.419: E/VideoPlayerActivity(15678): Media Error, Error Unknown -2147483648
EDIT: For videos that are not from youtube, it does not crash, with that, error, it just does not show the video.What can be wrong?
這對於非YouTube視頻的logcat的：
06-26 14:50:09.536: D/VideoPlayerActivity(18860): Start
06-26 14:50:09.536: D/VideoPlayerActivity(18860): set video playback
06-26 14:50:09.536: D/VideoPlayerActivity(18860): releasemediaplayer
06-26 14:50:09.536: D/MediaPlayer(18860): release() in
06-26 14:50:09.536: D/MediaPlayer(18860): release() out
06-26 14:50:09.536: D/VideoPlayerActivity(18860): playvideo
06-26 14:50:09.536: D/VideoPlayerActivity(18860): releasemediaplayer
06-26 14:50:09.536: D/VideoPlayerActivity(18860): set surface holder
06-26 14:50:09.546: D/VideoPlayerActivity(18860): set displat for surface holder
06-26 14:50:09.556: D/VideoPlayerActivity(18860): surface changed
06-26 14:50:09.556: D/VideoPlayerActivity(18860): pathtoplay is http://new.ineed.com/uploads/video/file/11426/Capture_113_1372246928119.mp4
06-26 14:50:09.556: I/MediaPlayer(18860): This is not a sprint project
06-26 14:50:09.556: D/MediaPlayer(18860): [DLNA]AP force disable DLNA: FALSE
06-26 14:50:09.566: D/MediaPlayer(18860): [DLNA]Force disable DLNA:
06-26 14:50:09.576: D/VideoPlayerActivity(18860): set holder to mediaplayer
06-26 14:50:09.576: D/MediaPlayer(18860): [DLNA]setDisplay
06-26 14:50:09.576: I/MediaPlayer(18860): setLPAflag() in
06-26 14:50:09.576: I/MediaPlayer(18860): mContext is null, can't getMirrorDisplayStatus!!!
06-26 14:50:09.576: I/MediaPlayer(18860): setLPAflag() out