如何实现使用SeekBar设置音量大小？

Question

拖动拖动条可调节音量大小，该怎样实现？
具体点，最好贴出源代码来。

Answer 1

public class MusicSound_SeekBar extends Activity {
    /** Called when the activity is first created. */
private SeekBar soundBar;
private MediaPlayer mediaPlayer;
private AudioManager audioManager;
@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        soundBar = (SeekBar)findViewById(R.id.soundBar);
        audioManager = (AudioManager)getSystemService(AUDIO_SERVICE);
        mediaPlayer = MediaPlayer.create(this, R.raw.example);
        mediaPlayer.start();
        soundBar.setMax(audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC));
        soundBar.setProgress(audioManager.getStreamVolume(AudioManager.STREAM_MUSIC));
        
        soundBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {@Override
public void onStopTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub}@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub}@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
// TODO Auto-generated method stub
if(fromUser){
audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC, progress, 0);
}
}
});
    }
}
这是我编写的代码，可是老出现错误，拖动滑块时就程序就意外停止，该怎样修改呀？

Answer 2

http://www.eoeandroid.com/thread-8133-1-1.html

Answer 3

http://www.eoeandroid.com/thread-83845-1-1.html