可拖动的View

使用动画实现View的拖动

@Override
    public boolean onTouchEvent(MotionEvent event) {

        int x = (int) event.getRawX();
        int y = (int) event.getRawY();
        switch (event.getAction()){
            case MotionEvent.ACTION_DOWN:
                break;
            case MotionEvent.ACTION_MOVE:
                int deltaX = x - mLastX;
                int deltaY = y - mLastY;
                int translationX = (int) (ViewHelper.getTranslationX(this) + deltaX);
                int translationY = (int) (ViewHelper.getTranslationY(this) + deltaY);
                ViewHelper.setTranslationX(this,translationX);
                ViewHelper.setTranslationY(this,translationY);
                break;
            case MotionEvent.ACTION_UP:
                break;
            default:
                break;
        }
        mLastX = x;
        mLastY = y;
        return true;
    }

重写View中onTouchEvent方法，通过getRawX()和getRawY()获取手指当前坐标。
使用动画兼容库NineOldAndroids中的ViewHelper类所提供的setTranslationX()和setTranslationY()进行View的移动