在Android TV中,由于系统UI较为复杂,需要对音量控制进行特殊处理。可采用以下方法来获取音量键事件:
1.注册广播接收器
public class VolumeReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals("android.media.VOLUME_CHANGED_ACTION")) {
int volume = intent.getIntExtra("android.media.EXTRA_VOLUME_STREAM_VALUE", -1);
int maxVolume = intent.getIntExtra("android.media.EXTRA_VOLUME_STREAM_MAX_VOLUME", -1);
// 处理音量改变事件
}
}
}
2.在Activity或Fragment中注册广播接收器
VolumeReceiver volumeReceiver = new VolumeReceiver(); registerReceiver(volumeReceiver, new IntentFilter("android.media.VOLUME_CHANGED_ACTION"));
3.如果需要获取硬件按键事件,则需要重载Activity的dispatchKeyEvent(KeyEvent event)函数,并在其中检测音量键事件
@Override
public boolean dispatchKeyEvent(KeyEvent event) {
int keyCode = event.getKeyCode();
if (keyCode == KeyEvent.KEYCODE_VOLUME_UP || keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
// 处理音量键事件
return true;
}
return super.dispatchKeyEvent(event);
}
通过以上方法,即可在Android TV 9上获取到音量键事件。