android 获取View组件宽和高

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();
}