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int difference = x -(Math.abs(mPreviewText.getMeasuredWidth()-keyView.getMeasuredWidth() ));//如果按键比放大镜pre宽度小,那么得到的是正数 因此往左边偏移这么多,但是应该出2
this.mPopupPreviewX = difference ;
mPopupPreviewY = y - mPreviewText.getHeight() - IJiamiTool.dip2px(keyView.getContext(), 30);