在触摸事件的Andr​​oid移动视图 [英] Android move view on touch event

问题描述

我想移动两种不同的观点为我的布局，这样的用户可以显示它喜欢他的愿望。

I would like to move two different views into my layout, so that an user can display it like his wishes.

到目前为止，我已经做了如下code来处理触摸事件：

So far I've made the following code to handle the touch event:

this.viewEvent.setOnTouchListener(new OnTouchListener() {
    @Override
    public boolean onTouch(View view, MotionEvent event)
    {           
        final int y = (int) event.getRawY();

        RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) view.getLayoutParams();
        switch (event.getAction() & MotionEvent.ACTION_MASK)
        {
            case MotionEvent.ACTION_DOWN:
                element.setEventY(y - params.topMargin);
                break;

            case MotionEvent.ACTION_UP:
                viewGroup.invalidate();
                break;

            case MotionEvent.ACTION_POINTER_DOWN:
            case MotionEvent.ACTION_POINTER_UP:
                break;

            case MotionEvent.ACTION_MOVE:
                params.topMargin = y - element.getEventY();
                params.bottomMargin = screenHeight - view.getHeight() - params.topMargin;

                // Avoid out of screen
                if (params.topMargin < 0) return true;

                // Apply changes
                view.setLayoutParams(params);
                break;
        }

        return true;
    }
});

元素是一个自定义对象来处理的位置的一个实例。 screenHeight 是由显示给定屏幕高度类。

element is an instance of a custom object to handle the position. screenHeight is the screen height given by the Display class.

我能够移动元素，但和它的闪烁，当我抚摸它，一旦我把我的手指了，认为只是disapear。我甚至无法找回它，它只是在屏幕中。

I'm able to move the element but it's blinking when I touch it and once I put my finger up, the view just disapear. I can't even retrieve it, it's just out of the screen.

我都做什么了吗？

感谢您的帮助

推荐答案

使用下面的code进行简单的按移动：

USe the following code to perform a simple Touch to move:

layout_counter.setOnTouchListener(new OnTouchListener() {
        @Override
        public boolean onTouch(View view, MotionEvent event)
        {
            if (currentState != State.EDIT_MOVE) return false;

            FrameLayout.LayoutParams params = (FrameLayout.LayoutParams) view.getLayoutParams();
            if (view.getId() != R.id.layout_counter) return false;

            switch (event.getAction())
            {
                case MotionEvent.ACTION_MOVE:
                    params.topMargin = (int) event.getRawY() - view.getHeight();
                    params.leftMargin = (int) event.getRawX() - (view.getWidth() / 2);
                    view.setLayoutParams(params);
                    break;

                case MotionEvent.ACTION_UP:
                    params.topMargin = (int) event.getRawY() - view.getHeight();
                    params.leftMargin = (int) event.getRawX() - (view.getWidth() / 2);
                    view.setLayoutParams(params);
                    break;

                case MotionEvent.ACTION_DOWN:
                    view.setLayoutParams(params);
                    break;
            }

            return true;
        }
    });

其中， layout_counter 是要移动的观点。

不要忘记把你的运动元素融入到一个的FrameLayout

Don't forget to put your movable elements into a FrameLayout

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