LinearLayout中的layout_weight属性

 

布局LinearLayout代码

 

 xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:orientation="vertical"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     >
 <Button
       android:layout_width="fill_parent"
       android:layout_height="fill_parent"
       android:text="Button1"
       android:background="#008000"
       android:layout_weight="0"
 />
 <Button
       android:layout_width="fill_parent"
       android:layout_height="fill_parent"
       android:text="Button2"
       android:background="#FFFF00"
       android:layout_weight="0"
 />
 LinearLayout>

 

layout_weight属性如果没有设置，则默认为0.

 

 

按钮1：button1,绿色

按钮2：button2,黄色

 

下面以按钮1和按钮2的weight属性（layout_weight）的变化，分别进行记录。

 

 

这里测试的是垂直布局android:orientation="vertical"，所以针对组件的 android:layout_height属性；如果测试的水平布局，则需针对组件的 android:layout_width属性。

 

 

（一） android:layout_height = "fill_parent"

 

 

button1(weight=0) button2(weight=0)	button1(weight=0) button2(weight=1)
button1(weight=1) button2(weight=1) button1占1/2，button2占1/2	button1(weight=1) button2(weight=2) button1占2/3，button2占1/3
button1(weight=1) button2(weight=9) button1占9/10，button2占1/10	button1(weight=1) button2(weight=30) button1占30/31，button2占1/31

 

 

（二） android:layout_height = "wrap_content"

 

button1(weight=0) button2(weight=0)	button1(weight=0) button2(weight=1)
button1(weight=1) button2(weight=1) button1占1/2，button2占1/2	button1(weight=1) button2(weight=2) button1占1/3，button2占2/3
button1(weight=1) button2(weight=9)	button1(weight=1) button2(weight=30)

 

通过以上实验可知：

（一） android:layout_height = "fill_parent"

（二） android:layout_height = "wrap_content"

在（一）、（二）2种情况在相同的weight属性下呈现出正好相反的情况。