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);

参考资料:http://www.linuxidc.com/Linux/2011-09/43132p2.htm,

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Android笔记:测量控件宽高和动态设置控件宽高