百分比布局的使用

1. build.gradle的 dependencies闭包部分

添加compile 'com.android.support:percent:24.2.1'

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:24.2.1'
    compile 'com.android.support:percent:24.2.1'
    testCompile 'junit:junit:4.12'
}

2. 添加 xmlns:app="http://schemas.android.com/apk/res-auto"
3. 使用

        app:layout_widthPercent="50%"
        app:layout_heightPercent="50%"

4. 全代码

<?xml version="1.0" encoding="utf-8"?>
<android.support.percent.PercentFrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <Button
        android:id="@+id/button_p_1"
        android:text="Button1"
        android:layout_gravity="left|top"
        app:layout_widthPercent="50%"
        app:layout_heightPercent="50%"/>
    <Button
        android:id="@+id/button_p_2"
        android:text="Button2"
        android:layout_gravity="end|top"
        app:layout_widthPercent="50%"
        app:layout_heightPercent="50%"/>
    <Button
        android:id="@+id/button_p_3"
        android:text="Button3"
        android:layout_gravity="left|bottom"
        app:layout_widthPercent="50%"
        app:layout_heightPercent="50%"/>
    <Button
        android:id="@+id/button_p_4"
        android:text="Button4"
        android:layout_gravity="bottom|right"
        app:layout_widthPercent="50%"
        app:layout_heightPercent="50%"/>

</android.support.percent.PercentFrameLayout>

效果图