xml

android:id="@+id/mVolume"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="音量"

android:textSize="18sp"/>

android:id="@+id/sound"

android:layout_width="400px"

android:layout_height="50dp"

android:layout_gravity="center"

android:max="100"

android:progress="10"

android:progressDrawable="@drawable/seekbar_style"

android:thumb="@drawable/thumb" />

Activity

private TextView mVolume; //显示当前音量

public SeekBar soundBar;

private int maxVolume, currentVolume;

final SeekBar soundBar = (SeekBar) findViewById(R.id.sound); //音量设置

mVolume = (TextView) findViewById(R.id.mVolume);

audiomanage = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

maxVolume = audiomanage.getStreamMaxVolume(AudioManager.STREAM_MUSIC); //获取系统最大音量

soundBar.setMax(maxVolume); //拖动条最高值与系统最大声匹配

currentVolume = audiomanage.getStreamVolume(AudioManager.STREAM_MUSIC); //获取当前值

soundBar.setProgress(currentVolume);

mVolume.setText(currentVolume * 100 / maxVolume + " %");

soundBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {//调音监听器

public void onProgressChanged(SeekBar arg0, int progress, boolean fromUser) {

audiomanage.setStreamVolume(AudioManager.STREAM_MUSIC, progress, 0);

currentVolume = audiomanage.getStreamVolume(AudioManager.STREAM_MUSIC); //获取当前值

soundBar.setProgress(currentVolume);

mVolume.setText(currentVolume * 100 / maxVolume + " %");

}

@Override

public void onStartTrackingTouch(SeekBar seekBar) {

// TODO Auto-generated method stub

}

@Override

public void onStopTrackingTouch(SeekBar seekBar) {

// TODO Auto-generated method stub

}

});