private Button mButton;
//当视图加载完成之后，才能取得组件的宽和高
@Override
public void onWindowFocusChanged(boolean hasFocus) {
//
TODO Auto-generated method
stub
super.onWindowFocusChanged(hasFocus);
int width =
mButton.getWidth();
}
原文：http://www.cnblogs.com/manbu/p/3540674.html