public class MainActivity extends Activity {  VideoView videoView;  static int pos=1; //靜態整型變量用于標記播放到了第幾段視頻  MediaController mController;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    getWindow().setFormat(PixelFormat.TRANSLUCENT);    setContentView(R.layout.activity_main);    videoView=(VideoView)findViewById(R.id.video);    mController=new MediaController(this);    File video=new File("/mnt/sdcard/Download/video"+pos+".mp4");    if(video.exists())    {      videoView.setVideoPath(video.getAbsolutePath());    /* videoView.setMediaController(mController);      mController.setMediaPlayer(videoView);*/      videoView.requestFocus();      videoView.start();    }    videoView.setOnCompletionListener(new OnCompletionListener() {      @Override      public void onCompletion(MediaPlayer mp) {        // TODO Auto-generated method stub        pos=pos+1; //在這里將視頻地址變為下一個        File video2=new File("/mnt/sdcard/Download/video"+pos+".mp4");        if(video2.exists())        {        try {          videoView.setVideoPath(video2.getAbsolutePath());          /*videoView.setMediaController(mController);          mController.setMediaPlayer(videoView);*/          videoView.requestFocus();          videoView.start();        } catch (Exception e) {          e.printStackTrace();        }        }        else        {Toast.makeText(MainActivity.this,"視頻播放完畢",Toast.LENGTH_SHORT).show();}      }    });  }}