"ScrollView can host only one direct child"问题解决

淩亂°似流年 2023-10-16 20:46 9阅读 0赞

**1. 问题描述：**

**（注意下面的黑体字）。**

ScrollView作为顶层view时报错，直接导致apk崩溃，详细错误信息如下：

12-21 09:12:15.150: D/AndroidRuntime(7726): Shutting down VM  
12-21 09:12:15.150: W/dalvikvm(7726): threadid=1: thread exiting with uncaught exception (group=0x416402a0)  
12-21 09:12:15.160: E/AndroidRuntime(7726): FATAL EXCEPTION: main  
12-21 09:12:15.160: E/AndroidRuntime(7726): java.lang.RuntimeException: **Unable to start activity ComponentInfo\{com.project.fish.app/com.my.act.activity.my.MyFA\}: java.lang.IllegalStateException: ScrollView can host only one direct child**  
12-21 09:12:15.160: E/AndroidRuntime(7726): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2110)  
12-21 09:12:15.160: E/AndroidRuntime(7726): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2135)  
12-21 09:12:15.160: E/AndroidRuntime(7726): at android.app.ActivityThread.access$700(ActivityThread.java:140)  
12-21 09:12:15.160: E/AndroidRuntime(7726): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1237)  
12-21 09:12:15.160: E/AndroidRuntime(7726): at android.os.Handler.dispatchMessage(Handler.java:99)  
12-21 09:12:15.160: E/AndroidRuntime(7726): at android.os.Looper.loop(Looper.java:137)  
12-21 09:12:15.160: E/AndroidRuntime(7726): at android.app.ActivityThread.main(ActivityThread.java:4921)  
12-21 09:12:15.160: E/AndroidRuntime(7726): at java.lang.reflect.Method.invokeNative(Native Method)  
12-21 09:12:15.160: E/AndroidRuntime(7726): at java.lang.reflect.Method.invoke(Method.java:511)  
12-21 09:12:15.160: E/AndroidRuntime(7726): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)  
12-21 09:12:15.160: E/AndroidRuntime(7726): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)  
12-21 09:12:15.160: E/AndroidRuntime(7726): at dalvik.system.NativeStart.main(Native Method)  
12-21 09:12:15.160: E/AndroidRuntime(7726): Caused by: java.lang.IllegalStateException: **ScrollView can host only one direct child**  
12-21 09:12:15.160: E/AndroidRuntime(7726): at android.widget.ScrollView.addView(ScrollView.java:316)  
12-21 09:12:15.160: E/AndroidRuntime(7726): at android.view.LayoutInflater.rInflate(LayoutInflater.java:750)  
12-21 09:12:15.160: E/AndroidRuntime(7726): at android.view.LayoutInflater.inflate(LayoutInflater.java:489)  
12-21 09:12:15.160: E/AndroidRuntime(7726): at android.view.LayoutInflater.inflate(LayoutInflater.java:396)  
12-21 09:12:15.160: E/AndroidRuntime(7726): at android.view.LayoutInflater.inflate(LayoutInflater.java:352)  
12-21 09:12:15.160: E/AndroidRuntime(7726): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:307)  
12-21 09:12:15.160: E/AndroidRuntime(7726): at android.app.Activity.setContentView(Activity.java:1924)  
12-21 09:12:15.160: E/AndroidRuntime(7726): at com.my.act.InitTitlebar(MyFA.java:113)  
12-21 09:12:15.160: E/AndroidRuntime(7726): **at com.ui.activity.base.BaseFA.onCreate(BaseFA.java:29)**  
12-21 09:12:15.160: E/AndroidRuntime(7726): at com.fish.ui.activity.my.MyFA.onCreate(MyFA.java:169)  
12-21 09:12:15.160: E/AndroidRuntime(7726): at android.app.Activity.performCreate(Activity.java:5206)  
12-21 09:12:15.160: E/AndroidRuntime(7726): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)  
12-21 09:12:15.160: E/AndroidRuntime(7726): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2074)  
12-21 09:12:15.160: E/AndroidRuntime(7726): ... 11 more

**2. 分析：**

从错误信息**ScrollView can host only one direct child**  
可见，是xml的错误，下面列出错误的xml文件：

<?xml version="1.0" encoding="utf-8"?>  
<ScrollView xmlns:android="[http://schemas.android.com/apk/res/android][http_schemas.android.com_apk_res_android]"  
xmlns:tools="[http://schemas.android.com/tools][http_schemas.android.com_tools]"  
android:layout\_width="fill\_parent"  
android:layout\_height="fill\_parent"  
android:background="@color/WhiteColor"  
android:scrollbars="vertical" >

</ScrollView>

，这个ScrollView中包含3个LinerLayout。

**3. 解决：**

从错误信息，我们就知道，需要scrollview不能有多个child，所以，我在3个layout外，又加了一个layout，使3个layou成为这个新加的layout的子view，问题解决。下面是正确的xml定义：

<**LinearLayout  
android:layout\_width="fill\_parent"  
android:layout\_height="wrap\_content"  
android:orientation="vertical"  
android:paddingTop="15dip" >**

<TextView  
android:layout\_width="fill\_parent"  
android:layout\_height="2dp"  
android:background="@color/lightgray" />  
</LinearLayout>  
**</LinearLayout>**

</ScrollView>

[http_schemas.android.com_apk_res_android]: http://schemas.android.com/apk/res/android
[http_schemas.android.com_tools]: http://schemas.android.com/tools