任意移动的ImageView, 可以根据速率来判断是移动还是点击_imageview 判断是点击还是滑动-优快云博客

本文链接：https://blog.youkuaiyun.com/woshimiaoxingren/article/details/52038130

本文介绍了一个自定义的Android视图MyView，该视图继承自ImageView并重写了onTouchEvent方法来处理触摸事件。文章详细展示了如何使用MotionEvent的不同状态来实现点击和移动效果，并利用VelocityTracker来计算触摸移动的速度。

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public class MyView extends ImageView {

    float downX, downY;
    float moveX, moveY;

    Context mContext;

    //速度追踪器
    VelocityTracker velocityTracker;

    public MyView(Context context) {
        super(context);
        mContext = context;
    }

    public MyView(Context context, AttributeSet attrs) {
        super(context, attrs);
        mContext = context;
        setImageResource(R.mipmap.shopping_cart);

    }


    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()){
            case MotionEvent.ACTION_DOWN:
                downX = event.getRawX();
                downY = event.getRawY();
                if (velocityTracker==null){
                    velocityTracker = VelocityTracker.obtain();
                }else{
                    velocityTracker.clear();
                }

                velocityTracker.addMovement(event);
                break;
            case MotionEvent.ACTION_MOVE:
                moveX = event.getRawX();
                moveY = event.getRawY();

                this.setX(getX() + (moveX - downX));
                this.setY(getY() + (moveY - downY));
                downX = moveX;
                downY = moveY;

                velocityTracker.addMovement(event);
                velocityTracker.computeCurrentVelocity(1000);// 用于计算速度   1000 为毫秒

                break;
            case MotionEvent.ACTION_UP:


                if (velocityTracker.getXVelocity()==0 && velocityTracker.getYVelocity()==0){
                    Toast.makeText(mContext,"OnClick...",Toast.LENGTH_SHORT).show();
                }else{
                    Toast.makeText(mContext,"Move...",Toast.LENGTH_SHORT).show();
                }

                Log.i("msg","velocityTracker.getXVelocity()==="+velocityTracker.getXVelocity());
                Log.i("msg","velocityTracker.getYVelocity()==="+velocityTracker.getYVelocity());
                break;
        }
        return true;
    }
}