Android笔记:测量控件宽高和动态设置控件宽高

1.测算控件宽高

 初始化UI时,无法直接通过getWidth()或getHeight()获取到控件的宽度或高度。可采用定时测算去获取控件的宽度/高度,方法如下:

//每隔10毫秒测算一次宽度,直到测算完毕
mMeasureAction =  new  Runnable()
{
    @Override
    public  void  run()
    {
        if  (mLayout_map.getWidth() !=  0 )
        {
            Log.i( "w" , mLayout_map.getWidth() +  "" );
            Log.i( "h" , mLayout_map.getHeight() +  "" );
       }
        else
        {
            mLayout_map.postDelayed(mMeasureAction,  10 );
        }
    }
};
mLayout_map.postDelayed(mMeasureAction,  10 );

参考资料：http://blog.163.com/zhaolin53636848@126/blog/static/490866682012065373798/

2.动态修改控件的宽高

  比如，将imageview的宽度改为200，高度改为宽度的3/4。其中RelativeLayout是imageview的父布局，方法如下:

import  android.widget.RelativeLayout.LayoutParams;

int  imgWeight =  200 ;
RelativeLayout.LayoutParams sp_params =  new  RelativeLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
sp_params.width = imgWeight;
sp_params.height = imgWeight *  3  / 4  ;
imageView.setLayoutParams(sp_params);

本文转自 glblong 51CTO博客，原文链接：http://blog.51cto.com/glblong/1358564，如需转载请自行联系原作者