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我正在编写其中一项活动能够播放视频文件的应用程序。我录制了视频，但是当尝试播放时开始出现问题。活动开始并第一次正常播放视频。然后我按后退按钮，返回上一个活动，选择视频（相同或其他），视频播放活动再次进入，所有视图（按钮，搜索栏等）显示，但视频不显示。我再次返回，选择视频，打开视频播放活动，视频再次正常播放。所以它每秒钟播放一次。我试图调试但找不到问题所在，任何帮助将不胜感激。活动代码在下面，eclipse 的 logCat 输出也在下面。

public class FightPlayerActivity extends Activity implements OnSeekBarChangeListener, SurfaceHolder.Callback, OnPreparedListener {

    private MediaPlayer mp=null;
    private SeekBar seekBar;

    private String filePath;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        Toast.makeText(this,"Create ", 2000).show();

        setContentView(R.layout.fight_player);

        filePath=getIntent().getStringExtra("filename");
        filePath=Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM)+"/FightAll_BJJ_Scoring/"+filePath;

        Toast.makeText(this,filePath, 2000).show();
        // seek bar

        seekBar=(SeekBar) findViewById(R.id.seek_bar);
        seekBar.setOnSeekBarChangeListener(this);
        try {
            SurfaceView sv=(SurfaceView) findViewById(id.video_preview);

            SurfaceHolder sh=sv.getHolder();
            sh.addCallback(this);

            sh.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

        } catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SecurityException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalStateException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }      
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {
        // TODO Auto-generated method stub

    }

    public void onStop(View view)
    {
        super.onStop();

        mp.stop();
        mp.reset();
        mp.release();
    }

    public void onStart(View view)
    {
        super.onStart();

    }

    public void stop(View view)
    {
        mp.stop();
    }

    public void pause(View view)
    {
        mp.pause();
    }

    public void play(View view)
    {
        mp.start();
    }

    public void surfaceCreated(SurfaceHolder holder) {

        try {
            mp=new MediaPlayer();
            mp.setDataSource(filePath);
            mp.setDisplay(holder);  
            mp.setOnPreparedListener(this);
            mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
            mp.prepare();

        } catch (IllegalStateException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } 
    }


    public void surfaceDestroyed(SurfaceHolder holder) {
        // TODO Auto-generated method stub

    }

    public void onPrepared(MediaPlayer mediaplayer) {
         mp.start(); 
         seekBar.setMax(mp.getDuration());
    }

    public void onProgressChanged(SeekBar sb,int progress,boolean fromUser)
    {
        //Toast.makeText(this, progress, 2000).show();
        mp.seekTo(progress);
    }

    public void onStartTrackingTouch(SeekBar seekBar) {
        // TODO Auto-generated method stub
        onProgressChanged(seekBar,seekBar.getProgress(),true);
    }

    public void onStopTrackingTouch(SeekBar seekBar) {
        // TODO Auto-generated method stub

 }

并在下面登录：

08-19 18:26:39.325: E/MediaPlayer(7057): message received msg=200, ext1=1, ext2=44
08-19 18:26:39.325: W/MediaPlayer(7057): info/warning (1, 44)
08-19 18:26:39.325: E/MediaPlayer(7057): callback application
08-19 18:26:39.325: E/MediaPlayer(7057): back from callback
08-19 18:26:39.325: E/MediaPlayer(7057): message received msg=1, ext1=0, ext2=0
08-19 18:26:39.325: E/MediaPlayer(7057): callback application
08-19 18:26:39.325: E/MediaPlayer(7057): back from callback
08-19 18:26:39.361: E/MediaPlayer(7057): message received msg=5, ext1=176, ext2=144
08-19 18:26:39.361: E/MediaPlayer(7057): callback application
08-19 18:26:39.365: E/MediaPlayer(7057): back from callback
08-19 18:26:39.380: I/MediaPlayer(7057): Info (1,44)
08-19 18:26:45.661: E/MediaPlayer(7057): message received msg=200, ext1=1, ext2=44
08-19 18:26:45.661: W/MediaPlayer(7057): info/warning (1, 44)
08-19 18:26:45.661: E/MediaPlayer(7057): callback application
08-19 18:26:45.661: E/MediaPlayer(7057): back from callback
08-19 18:26:45.661: E/MediaPlayer(7057): message received msg=1, ext1=0, ext2=0
08-19 18:26:45.661: E/MediaPlayer(7057): callback application
08-19 18:26:45.661: E/MediaPlayer(7057): back from callback
08-19 18:26:45.708: I/MediaPlayer(7057): Info (1,44)
08-19 18:26:45.779: W/IMediaDeathNotifier(7057): media server died
08-19 18:26:45.779: E/MediaPlayer(7057): message received msg=100, ext1=100, ext2=0
08-19 18:26:45.779: E/MediaPlayer(7057): error (100, 0)
08-19 18:26:45.779: E/MediaPlayer(7057): callback application
08-19 18:26:45.779: E/MediaPlayer(7057): back from callback
08-19 18:26:45.779: E/MediaPlayer(7057): message received msg=100, ext1=100, ext2=0
08-19 18:26:45.779: E/MediaPlayer(7057): error (100, 0)
08-19 18:26:45.779: E/MediaPlayer(7057): callback application
08-19 18:26:45.779: E/MediaPlayer(7057): back from callback
08-19 18:26:45.779: W/Camera(7057): Camera server died!
08-19 18:26:45.786: E/MediaPlayer(7057): Error (100,0)
08-19 18:26:45.790: E/MediaPlayer(7057): Error (100,0)
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1 回答 1

0

已解决.. 必须将初始化代码从 onCreate() 移动到 onStart() 并从 onStart() 中删除“查看视图”。

于 2012-08-19T09:08:40.503 回答