如何检测服务中的 keyup 和 keydown 事件

Question

我有一个扩展 LinearLayout 的 CustomView，我使用 WindowManager.addView() 方法将其添加到屏幕，以使用以下布局参数标志检测我服务中的关键事件

  LinearLayout mLinear = new LinearLayout(getApplicationContext()) {
        @Override
        public boolean dispatchKeyEvent(KeyEvent event) {
            super.dispatchKeyEvent(event);
            Log.i(TAG, "event");

            int action = event.getAction();
            int keyCode = event.getKeyCode();
            switch (keyCode) {

                case KeyEvent.KEYCODE_VOLUME_UP:
                    Log.i("Key", "VolumeUp");

                    return true;
                case KeyEvent.KEYCODE_VOLUME_DOWN:
                   Log.i("Key", "VolumeDown");
                    return true;

                case KeyEvent.KEYCODE_BACK:
                    Log.d(TAG, " " + "KEYCODE_BACK");

                    return false;

                default:
                    return true;
            }

        }

    };

    mView = LayoutInflater.from(this).inflate(R.layout.volume_service_layout, mLinear);
    wm = (WindowManager) getSystemService(WINDOW_SERVICE);


    if (mView.getVisibility() == View.VISIBLE)
        flag =  WindowManager.LayoutParams.SOFT_INPUT_ADJUST_NOTHING ;


    //params
    params = new WindowManager.LayoutParams(
            100,
            100,
            WindowManager.LayoutParams.TYPE_SYSTEM_ALERT,
            WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL,
            PixelFormat.TRANSLUCENT);
    params.gravity = Gravity.LEFT | Gravity.CENTER_VERTICAL;
    wm.addView(mView, params);

}

dispatchKeyEvent() 在 customview class 中被覆盖，但在将其添加到 windows 后按 Button 而不是 working.When 我正在添加WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE 标记 backpress 按钮工作正常，我无法检测到 keyup 和 keydown 事件。

我想在服务 class 中检测 keyup 或 keydown 事件。请为这个问题提出任何解决方案。

Answer 1

我猜你是通过 BroadcastReceiver

实现的

试试这个，

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"...>
    //code, like activities, etc

    <receiver android:name="com.example.test.VolumeBroadcast" >
        <intent-filter>
           <action android:name="android.intent.action.MEDIA_BUTTON" />
        </intent-filter>
</application>

接收者示例：

  public class VolumeBroadcast extends BroadcastReceiver{

      public void onReceive(Context context, Intent intent) {
           //check the intent something like:
           if (Intent.ACTION_MEDIA_BUTTON.equals(intent.getAction())) {
              KeyEvent event = (KeyEvent)intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
              if (KeyEvent.KEYCODE_MEDIA_PLAY == event.getKeyCode()) {
                 // Handle key press.
              }
           }
      }
  }

你的注册方式是这样的：

 AudioManager am = mContext.getSystemService(Context.AUDIO_SERVICE);
// Start listening for button presses
am.registerMediaButtonEventReceiver(RemoteControlReceiver); 
// Stop listening for button presses
am.unregisterMediaButtonEventReceiver(RemoteControlReceiver);

Audio Playback

Answer 2

在这种情况下，

Android 没有记录与 volume buttons 交互的 API。所以我think.Its不可能

Answer 3

要从服务中检测音量键按下尝试 AccessibilityService 并覆盖 onkeyEvent()
然后你在被覆盖的事件中做剩下的计算

如何检测服务中的 keyup 和 keydown 事件

How to detect keyup and keydown event in service

android

android-windowmanager

onbackpressed