android拖动视图平滑 [英] android drag view smooth
本文介绍了android拖动视图平滑的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我必须在屏幕上拖动一些视图.我正在通过从触摸侦听器的 ACTION_MOVE 上的运动事件更改布局参数的左侧和顶部来修改它们的位置.有没有办法更平滑地拖动"项目?因为这种拖拽"一点都不顺畅...这是代码
I have to drag some views on screen. I am modifying their position by changing left and top of their layout parameters from motion event on ACTION_MOVE from touch listener. Is there a way to "drag" items more smooth? Because tis kind of "dragging" is no smooth at all... Here is the code
public boolean onTouch(View view, MotionEvent motionEvent) {
switch (motionEvent.getAction()) {
case MotionEvent.ACTION_DOWN:
dx = (int) motionEvent.getX();
dy = (int) motionEvent.getY();
break;
case MotionEvent.ACTION_MOVE:
int x = (int) motionEvent.getX();
int y = (int) motionEvent.getY();
RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams) view.getLayoutParams();
int left = lp.leftMargin + (x - dx);
int top = lp.topMargin + (y - dy);
lp.leftMargin = left;
lp.topMargin = top;
view.setLayoutParams(lp);
break;
}
return true;
}
推荐答案
尽量使用motionEvent.getRawX()和motionEvent.getRawY()代替getY和getX
Try to use motionEvent.getRawX() and motionEvent.getRawY() instead of getY and getX
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