android - 滑动以从 FrameLayout 中关闭 TextView

Question

我想使用下面的代码从 FrameLayout 中关闭 TextView。

目前，当方法触发时，我正在获取日志，这太棒了!

但我如何执行滑动以关闭？

SwipeDismissTouchListener.java

public class SwipeDismissTouchListener implements View.OnTouchListener {

static final String logTag = "ActivitySwipeDetector";
private Activity activity;
static final int MIN_DISTANCE = 100;
private float downX, upX;

public SwipeDismissTouchListener(GameActivity gameActivity) {
    activity = gameActivity;
}

public void onRightToLeftSwipe() {
    Log.i(logTag, "RightToLeftSwipe!");
    Toast.makeText(activity, "RightToLeftSwipe", Toast.LENGTH_SHORT).show();
    // activity.doSomething();
}

public void onLeftToRightSwipe() {
    Log.i(logTag, "LeftToRightSwipe!");
    Toast.makeText(activity, "LeftToRightSwipe", Toast.LENGTH_SHORT).show();
    // activity.doSomething();
}

public boolean onTouch(View v, MotionEvent event) {
    switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN: {
            downX = event.getX();
            return true;
        }
        case MotionEvent.ACTION_UP: {
            upX = event.getX();

            float deltaX = downX - upX;

            if (Math.abs(deltaX) > MIN_DISTANCE) {
                if (deltaX < 0) {
                    this.onLeftToRightSwipe();
                    return true;
                }
                if (deltaX > 0) {
                    this.onRightToLeftSwipe();
                    return true;
                }
            } else {
                Log.i(logTag, "Swipe was only " + Math.abs(deltaX) + " long horizontally, need at least " + MIN_DISTANCE);
                // return false; // We don't consume the event
            }

            return false; // no swipe horizontally and no swipe vertically
        }// case MotionEvent.ACTION_UP:
    }
    return false;
}
}

MyActivity.java

 SwipeDismissTouchListener swipeListener = new SwipeDismissTouchListener(this);
 frameLayout.setOnTouchListener(swipeListener);

这里有一些链接，但我不确定如何实现它们 Foo Bar

Answer 1

Bar链接是一个很好的起点。

您通常做的是设置 TextView 的 translateX 和 alpha 属性 ... Roman Nurik 还添加了一个速度跟踪器来检测“滑动手势”并启动一个动画，该动画还将为 translateX 和 alpha 属性设置动画

在 SwipeDismiss 之后，您只需调用 framelayout.removeView(textView)

您还可以考虑覆盖您的 FrameLayout(FrameLayout 的子类)的 onTouch 方法，如下所述:

http://developer.android.com/training/gestures/viewgroup.html