Android fill_parent和wrap_content分析

(?)[+]
1 wrap_content
2 fill_parent width
3 fill_parent height
4 fill_parent width height

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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