Android实战之Scrollbar Activity

Android中几个常用的Layout虽然有scrollbar属性，但是并不能实现当其中内容太多时自动在Activity上出现Scrollbar，后来发现对于这种情况其实是需要使用ScrollView来处理的，具体配置可以如下：

 <? 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 = "wrap_content"   >
         < ScrollView
             android:layout_width = "fill_parent"
             android:layout_height = "wrap_content"   >
             < LinearLayout
                 android:id = "@+id_scrollbar/layout1"
                 android:orientation = "vertical"
                 android:layout_width = "fill_parent"
                 android:layout_height = "wrap_content"   >
                 ...
             </ LinearLayout >
     </ ScrollView >
 </ LinearLayout >

<?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="wrap_content" > <ScrollView android:layout_width="fill_parent" android:layout_height="wrap_content" > <LinearLayout android:id="@+id_scrollbar/layout1" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="wrap_content" > ... </LinearLayout> </ScrollView> </LinearLayout>

 

或者

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

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

 

其中需要注意的是ScrollView内部只能有一个子元素，所以需要把所有的子元素放到一个LinearLayout内部。