コード例 #1
0
 @Override
 protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
   final int width = getMeasuredWidth();
   final int height = getMeasuredHeight();
   if (getChildCount() == 0) {
     return;
   }
   if (mTarget == null) {
     ensureTarget();
   }
   if (mTarget == null) {
     return;
   }
   final View child = mTarget;
   final int childLeft = getPaddingLeft();
   final int childTop = getPaddingTop();
   final int childWidth = width - getPaddingLeft() - getPaddingRight();
   final int childHeight = height - getPaddingTop() - getPaddingBottom();
   child.layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight);
   int circleWidth = mCircleView.getMeasuredWidth();
   int circleHeight = mCircleView.getMeasuredHeight();
   mCircleView.layout(
       (width / 2 - circleWidth / 2),
       mCurrentTargetOffsetTop,
       (width / 2 + circleWidth / 2),
       mCurrentTargetOffsetTop + circleHeight);
 }