Android 开发之音乐播放之进度条

核心提示：// TODO Auto-generated method stub}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stubint dest = seekBar.getProgress()

// TODO Auto-generated method stub

}

@Override

public void onStopTrackingTouch(SeekBar seekBar) {

// TODO Auto-generated method stub

int dest = seekBar.getProgress();

int mMax = mPlayer.getDuration();

int sMax = sBar.getMax();

mPlayer.seekTo(mMax*dest/sMax);

}

});

4. 刷新播放位置 且使其实时变化

//因为MediaPlayer没有播放进度的回调函数 所以只能:开辟一个Thread 定时通知其刷新

Java代码

1. public void startProgressUpdate(){

2. //开辟Thread 用于定期刷新SeekBar

3. DelayThread dThread = new DelayThread(100);

4. dThread.start();

5. }

public void startProgressUpdate(){

//开辟Thread 用于定期刷新SeekBar

DelayThread dThread = new DelayThread(100);

dThread.start();

}

而该Thread 具体实现为：

Java代码

1. private Handler mHandle = new Handler(){

2. @Override

3. public void handleMessage(Message msg){

4. int position = mPlayer.getCurrentPosition();

5.

6. int mMax = mPlayer.getDuration();

7. int sMax = sBar.getMax();

8.

9. sBar.setProgress(position*sMax/mMax);

10. }

11. };

12.

13. public class DelayThread extends Thread {

14. int milliseconds;

15.

16. public DelayThread(int i){

17. milliseconds = i;

18. }

19. public void run() {

20. while(true){

21. try {

22. sleep(milliseconds);

23. } catch (InterruptedException e) {

24. // TODO Auto-generated catch block

25. e.printStackTrace();

26. }

27.

28. mHandle.sendEmptyMessage(0);

29. }

30. }

31. }

5. emulator 运行截图：