獲取imageView 的寬高

int lwidth = View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED); 
int rheight = View.MeasureSpec.makeMeasureSpec(0,View.MeasureSpec.UNSPECIFIED); 
imageview.measure(lwidth,rheight); 
final int imageview_width =imageview.getMeasuredWidth();