android - 屏幕锁定时使用音量键

Question

此代码不起作用将屏幕锁定。如果我想在屏幕锁定时使用音量键怎么办？

我的代码是：

@Override
public boolean dispatchKeyEvent(KeyEvent event) {
    int action = event.getAction();
    int keyCode = event.getKeyCode();
        switch (keyCode) {
        case KeyEvent.KEYCODE_VOLUME_UP:
            if (action == KeyEvent.ACTION_UP) {
                //TODO
            }
            return true;
        case KeyEvent.KEYCODE_VOLUME_DOWN:
            if (action == KeyEvent.ACTION_DOWN) {
                //TODO
            }
            return true;
        default:
            return super.dispatchKeyEvent(event);
        }
    }

Answer 1

您可以注册BroadcastReceiver操作“android.media.VOLUME_CHANGED_ACTION”：

android.media.VOLUME_CHANGED_ACTION

其他方法是： Android 上的音量键。

Answer 2

在服务中执行此操作：

public class MyService extends Service {

@Override
public void onCreate() {
    super.onCreate();
    final BroadcastReceiver vReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
             //your code here
        }
    };
    registerReceiver(vReceiver, new IntentFilter("android.media.VOLUME_CHANGED_ACTION"));
}

}

然后注册 BroadcastReceiver 与动作Intent.ACTION_SCREEN_OFF，当屏幕关闭时连续播放无声的声音，并Intent.ACTION_SCREEN_ON在屏幕打开时停止音乐的动作。音量按钮仅在播放音乐时激活。