在CardScrollView上接收触摸事件

Question

我有一个CardScrollView，其中有多个项目，我希望能够在一个项目上拉出一个菜单，类似于内置的时间轴。

我知道Card不能附加特定的菜单，所以我在活动级别准备了菜单。

然而，似乎有什么东西正在吞噬所有的onKeyDown事件。

public class HostsView extends CardScrollView {
  private String TAG = "HostsView";
  private HostsCardScrollAdapter cards;
  private Activity parent;

  public HostsView(Activity parent, HostDatabase hostDb) {
    super(parent);
    cards = new HostsCardScrollAdapter(parent);
            //populates the cards and what not
    this.setAdapter(cards);
    this.activate();
  }

  @Override
  public boolean onKeyDown(int keyCode, KeyEvent event) {
                  //I never see this log
    Log.d(TAG, "Key event " + event.toString());
    if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {
        parent.openOptionsMenu();
        return true;
    }
    return super.onKeyDown(keyCode, event);
  }
}

Answer 1

如果你只需要在CardScrollView中简单地轻敲一张卡，你可以调用setOnItemClickListener来附加一个AdapterView.OnItemClickListener，就像你使用标准的安卓ListView一样。对于这种基本用例，这通常比使用GestureDetector简单得多。

Answer 2

昨天我遇到了同样的问题。我用GestureDetector解决了这个问题，正如GDK文档所建议的那样。下面是我使用的代码：

private GestureDetector mGestureDetector;

@Override
public void onCreate(Bundle savedInstanceState) {
mGestureDetector = createGestureDetector(this);
}


private GestureDetector createGestureDetector(Context context) {
    GestureDetector gestureDetector = new GestureDetector(context);
    gestureDetector.setBaseListener( new GestureDetector.BaseListener() {
        @Override
        public boolean onGesture(Gesture gesture) {
            if (gesture == Gesture.LONG_PRESS || gesture == Gesture.TAP) {
                Log.d(MainActivity.TAG, "Tap"); //When I tap the touch panel, I only get LONG_PRESS
                openOptionsMenu();
                return true;
            } else if (gesture == Gesture.TWO_TAP) {

                return true;
            } else if (gesture == Gesture.SWIPE_RIGHT) {

                return true;
            } else if (gesture == Gesture.SWIPE_LEFT) {

                return true;
            }
            return false;
        }
    });
    return gestureDetector;
}

@Override
public boolean onGenericMotionEvent(MotionEvent event) {
    if (mGestureDetector != null) {
        return mGestureDetector.onMotionEvent(event);
    }
    return false;
}

您的菜单现在应该打开了！