Android：如何创建视频播放器？

概述我正在创建一个录像机,并希望创建视频播放器来预览录制的视频.修改代码fromthispage我已经通过以下方式创建了一个MediaPreview类：publicclassMediaPreviewextendsActivityimplementsOnErrorListener,OnBufferingUpdateListener,OnCompletionListener,OnPreparedList

我正在创建一个录像机,并希望创建视频播放器来预览录制的视频.修改代码from this page我已经通过以下方式创建了一个MediaPrevIEw类：

public class MediaPrevIEw extends Activity implements one rrorListener, OnBufferingUpdateListener,OnCompletionListener, OnPreparedListener, SurfaceHolder.Callback{private static final String TAG = "MediaPrevIEw";private MediaPlayer mp;private SurfaceVIEw mPrevIEw;private SurfaceHolder holder;private button btnPlay;private button btnPause;private button btnreset;private button btnStop;private String mPath;@OverrIDeprotected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.media_prevIEw);    mPrevIEw = (SurfaceVIEw)findVIEwByID(R.ID.mPrevIEw);    btnPlay = (button)findVIEwByID(R.ID.btnPlay);    btnPause = (button)findVIEwByID(R.ID.btnPause);    btnreset = (button)findVIEwByID(R.ID.btnreset);    btnStop = (button)findVIEwByID(R.ID.btnStop);    getPathFromParentDialog();    btnPlay.setonClickListener(new VIEw.OnClickListener(){        @OverrIDe        public voID onClick(VIEw v) {            playVIDeo();        }    });    btnPause.setonClickListener(new VIEw.OnClickListener(){        @OverrIDe        public voID onClick(VIEw v) {            // Todo auto-generated method stub            if(mp != null){                mp.pause();            }        }    });    btnreset.setonClickListener(new VIEw.OnClickListener(){        @OverrIDe        public voID onClick(VIEw v) {            if(mp != null){                mp.seekTo(0);            }        }    });    btnStop.setonClickListener(new VIEw.OnClickListener(){        @OverrIDe        public voID onClick(VIEw v) {            if(mp != null){                mp.stop();                mp.release();            }        }    });    getwindow().setFormat(PixelFormat.transparent);    holder = mPrevIEw.getHolder();    holder.addCallback(this);    holder.setFixedSize(400, 300);}@OverrIDeprotected voID onResume() {    setRequestedOrIEntation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);    super.onResume();}@OverrIDepublic boolean one rror(MediaPlayer mp, int what, int extra) {    if(mp != null){        mp.stop();        mp.release();    }    return false;}@OverrIDepublic voID onBufferingUpdate(MediaPlayer mp, int percent) {    // Todo auto-generated method stub}@OverrIDepublic voID onCompletion(MediaPlayer mp) {    // Todo auto-generated method stub}@OverrIDepublic voID onPrepared(MediaPlayer mp) {    // Todo auto-generated method stub}@OverrIDepublic voID surfaceChanged(SurfaceHolder holder, int format, int wIDth,        int height) {    // Todo auto-generated method stub}@OverrIDepublic voID surfaceCreated(SurfaceHolder holder) {    // Todo auto-generated method stub}@OverrIDepublic voID surfaceDestroyed(SurfaceHolder holder) {    // Todo auto-generated method stub}private voID playVIDeo() {    try{        mp = new MediaPlayer();        mp.setonErrorListener(this);        mp.setonBufferingUpdateListener(this);        mp.setonCompletionListener(this);        mp.setonPreparedListener(this);        mp.setAudioStreamType(2);        mp.setdisplay(mPrevIEw.getHolder());        Runnable r = new Runnable(){            @OverrIDe            public voID run() {                try{                    setDataSource(mPath);                }                catch(Exception ex){                    Log.e(TAG, ex.getMessage());                }                try {                    mp.prepare();                    Log.v(TAG, "Duration: ===> " + mp.getDuration());                } catch (IllegalStateException e) {                    // Todo auto-generated catch block                    e.printstacktrace();                } catch (IOException e) {                    // Todo auto-generated catch block                    e.printstacktrace();                    Log.e(TAG, e.getMessage());                }                mp.start();            }        };        new Thread(r).start();    }    catch(Exception ex){        String sDummy = ex.toString();        if(mp != null){            mp.stop();            mp.release();        }    }}private voID setDataSource(String path) throws IOException {    if(!URLUtil.isNetworkUrl(mPath)){        mp.setDataSource(mPath);    }    else{        URL url = new URL(mPath);        URLConnection cn = url.openConnection();        cn.connect();        inputStream stream = cn.getinputStream();        if(stream == null){            throw new RuntimeException("stream is null");        }        file fileTemp = file.createTempfile("mediaplayerTmp", "dat");        String tempPath = fileTemp.getabsolutePath();        fileOutputStream out = new fileOutputStream(fileTemp);        byte buf[] = new byte[128];        do{            int numRead = stream.read(buf);            if(numRead <= 0){                break;            }            out.write(buf, 0, numRead);        }while(true);        mp.setDataSource(tempPath);        try{            stream.close();        }        catch(Exception ex){            String sDummy = ex.toString();        }    }}private voID getPathFromParentDialog(){    Intent intent = getIntent();    mPath = intent.getExtras().getString(Medialibrary.filename);}}

代码成功执行(没有任何例外),直到mp.start();,但屏幕为空(屏幕上只有按钮).

有谁知道上面的代码中可能有什么问题,或者是否有任何可用于网络的例子？

我将衷心感谢您的帮助

解决方法:

关闭袖口,我认为你的一些回调方法需要更多的逻辑,比如surfaceCreated().

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