是否可以从子 xml 元素截获触摸事件

Question

我有一个视图寻呼机，我想拦截其父容器上的触摸事件。xml如下所示

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
 android:id="@+id/layoutContainer"
android:layout_height="match_parent" >

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginBottom="0dp" >

    <android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </android.support.v4.view.ViewPager>
</RelativeLayout>
</RelativeLayout>

由于视图寻呼机占据了整个屏幕，如果尝试将onTouchListener附加到id为“layoutContainer”的容器上，则不会触发任何操作。

我希望能够检测屏幕上的垂直滑动手势

private class MyGesture extends GestureDetector.SimpleOnGestureListener {

    @Override
    public boolean onSingleTapConfirmed(MotionEvent e) {

        return super.onSingleTapConfirmed(e);
    }

    @Override
    public boolean onSingleTapUp(MotionEvent e) {

        Snap snap = snaps.get(targetPosition);

        return super.onSingleTapUp(e);
    }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {

        float deltaX = e2.getX() - e1.getX();
        float deltaY = e2.getY() - e1.getY();

        if ((Math.abs(deltaX) < SWIPE_MIN_DISTANCE) || (Math.abs(velocityX) < SWIPE_THRESHOLD_VELOCITY)) {

        }
        else {

        }

        if ((Math.abs(deltaY) < SWIPE_MIN_DISTANCE) || (Math.abs(velocityY) < SWIPE_THRESHOLD_VELOCITY)) {

        }
        else {
            app.log("swipe up");
            //execute some code here
        }
        return true;
    }

}

我尝试做的另一件事是将触摸监听器连接到视图寻呼机，然后手动将运动事件传递给手势检测器，但这也不起作用。

Answer 1

您可以创建containerview extends RelativeLayout，并覆盖此视图组中的onInterceptTouchEvent。这样地：

@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
    switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
            mDownX = event.getX();
            mDownY = event.getY();
            return false;
        case MotionEvent.ACTION_MOVE:
            if (Math.abs(event.getX() - mDownX) < Math.abs(event.getY() - mDownY)) { // Up and down around sliding distance is greater than sliding distance;
                return true;
            }
            return false;
        default:
            break;
    }
    return false;
}