android PopupWindow 自适应宽度

PopupWindow弹出的菜单随内容的宽度决定，目前找到自认为比较好的办法是，重写ListView的onMeasure()方法。然后就可以实现了，在此mark一下。

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
     int maxWidth = meathureWidthByChilds() + getPaddingLeft() + getPaddingRight(); super.onMeasure(MeasureSpec.makeMeasureSpec(maxWidth,MeasureSpec.EXACTLY),heightMeasureSpec);
}
   public int meathureWidthByChilds() {
      int maxWidth = 0;
      View view = null;
      for (int i = 0; i < getAdapter().getCount(); i++) {
           view = getAdapter().getView(i, view, this);
           view.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
      if (view.getMeasuredWidth() > maxWidth){
         maxWidth = view.getMeasuredWidth();
      }
  }
   return maxWidth;
}