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。
