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

1. 问题叙述性说明：

（请注意以下几点大胆）。

ScrollView作为顶层view时报错，直接导致apk崩溃。具体错误信息例如以下：

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。以下列出错误的xml文件：

<?xml version="1.0" encoding="utf-8"?

>

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:background="@color/WhiteColor"

    android:scrollbars="vertical" >

<!-- =================1. image ========================= -->

<LinearLayout

            android:layout_width="fill_parent"

            android:layout_height="fill_parent"

            android:orientation="horizontal"

            android:paddingTop="15dip" >

<ImageView

                android:id="@+id/imageView_pic"

                android:layout_width="fill_parent"

                android:layout_height="wrap_content"

                android:contentDescription="text"

                android:scaleType="fitCenter"

                android:src="@drawable/empty_photo" />

        </LinearLayout>

<!-- ========================= 2. detail ================= -->

<LinearLayout

            android:layout_width="fill_parent"

            android:layout_height="32dp"

            android:layout_marginTop="10dp"

            android:orientation="vertical" >

<TextView

                android:id="@+id/text_prompt"

                android:layout_width="wrap_content"

                android:layout_height="fill_parent"

                android:layout_marginLeft="5dp"

                android:gravity="center"

                android:text="@string/text_detail"

                android:textSize="15dip" />

        </LinearLayout>

       

        <!-- ========================= 3. line ================= -->

       

        <LinearLayout

            android:layout_width="fill_parent"

            android:layout_height="32dp"

            android:layout_marginTop="4dp"

            android:orientation="vertical" >

<TextView

                android:layout_width="fill_parent"

                android:layout_height="2dp"

                android:background="@color/lightgray" />

        </LinearLayout>

</ScrollView>

，这个ScrollView中包括3个LinerLayout。

3. 解决：

从错误信息，我们就知道，须要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。

以下是正确的xml定义：

<?

xml version="1.0" encoding="utf-8"?

>

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:background="@color/WhiteColor"

    android:scrollbars="vertical" >

<LinearLayout

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:orientation="vertical"

        android:paddingTop="15dip" >

<!-- =================1. image ========================= -->

<LinearLayout

            android:layout_width="fill_parent"

            android:layout_height="fill_parent"

            android:orientation="horizontal"

            android:paddingTop="15dip" >

<ImageView

                android:id="@+id/imageView_pic"

                android:layout_width="fill_parent"

                android:layout_height="wrap_content"

                android:contentDescription="text"

                android:scaleType="fitCenter"

                android:src="@drawable/empty_photo" />

        </LinearLayout>

<!-- ========================= 2. detail ================= -->

<LinearLayout

            android:layout_width="fill_parent"

            android:layout_height="32dp"

            android:layout_marginTop="10dp"

            android:orientation="vertical" >

<TextView

                android:id="@+id/text_prompt"

                android:layout_width="wrap_content"

                android:layout_height="fill_parent"

                android:layout_marginLeft="5dp"

                android:gravity="center"

                android:text="@string/text_detail"

                android:textSize="15dip" />

        </LinearLayout>

       

        <!-- ========================= 3. line ================= -->

       

        <LinearLayout

            android:layout_width="fill_parent"

            android:layout_height="32dp"

            android:layout_marginTop="4dp"

            android:orientation="vertical" >

<TextView

                android:layout_width="fill_parent"

                android:layout_height="2dp"

                android:background="@color/lightgray" />

        </LinearLayout>

</LinearLayout>

</ScrollView>

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