Android fill_parent和wrap_content理解

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fill_parent设置一个顶部布局或控件强制性让它布满整个屏幕。

wrap_content布局指根据视图内部内容自动扩展以适应其大小。

1. wrap_content

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >

<Button
android:id="@+id/btnButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button CJP"/>

</RelativeLayout>

2. fill_parent – width

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >

<Button
android:id="@+id/btnButton1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Button CJP"/>

</RelativeLayout>

3. fill_parent – height

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >

<Button
android:id="@+id/btnButton1"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:text="Button CJP"/>

</RelativeLayout>

4. fill_parent – width, height

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >

<Button
android:id="@+id/btnButton1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="Button CJP"/>

</RelativeLayout>

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