给Android的音量按钮添加监听事件

@Override

public boolean onKeyDown (int keyCode, KeyEvent event) {

// 获取手机当前音量值

int i = getCurrentRingValue ();

switch (keyCode) {

// 音量减小

case KeyEvent.KEYCODE_VOLUME_DOWN:

Toast.makeText (Activity03.this, "当前音量值： " + i, Toast.LENGTH_SHORT).show ();

return true;

// 音量增大

case KeyEvent.KEYCODE_VOLUME_UP:

Toast.makeText (Activity03.this, "当前音量值： " + i, Toast.LENGTH_SHORT).show ();

return true;

}

return super.onKeyDown (keyCode, event);

}