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:
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//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
);
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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:
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import
android.widget.RelativeLayout.LayoutParams;
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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);
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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
