我有一种布局，如下所示
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<android.support.v4.widget.NestedScrollView
android:id="@+id/upperSroll"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:nestedScrollingEnabled="true"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<ScrollView
android:id="@+id/innerSroll"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<LinearLayout
android:id="@+id/up"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="50dp"
android:text="csdsbfsfbsdf sfjdsfjdsfhjsd" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="50dp"
android:text="csdsbfsfbsdf sfjdsfjdsfhjsd" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="50dp"
android:text="csdsbfsfbsdf sfjdsfjdsfhjsd" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="50dp"
android:text="csdsbfsfbsdf sfjdsfjdsfhjsd" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="50dp"
android:text="csdsbfsfbsdf sfjdsfjdsfhjsd" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="50dp"
android:text="csdsbfsfbsdf sfjdsfjdsfhjsd" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="50dp"
android:text="csdsbfsfbsdf sfjdsfjdsfhjsd" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="50dp"
android:text="csdsbfsfbsdf sfjdsfjdsfhjsd" />
</LinearLayout>
</ScrollView>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@id/innerSroll"
android:layout_weight="1"
android:background="@color/colorAccent"
android:orientation="vertical">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/ic_launcher_background" />
</RelativeLayout>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
</RelativeLayout>
它在不添加android:nestedScrollingEnabled="true"的情况下运行良好。如果在布局中添加此行，则会在Fragment中出现以下异常
07-22 12:07:33.694 13199-13199/com.example.mukesh.nestedscrollsample E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.mukesh.nestedscrollsample, PID: 13199
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mukesh.nestedscrollsample/com.example.mukesh.nestedscrollsample.MainActivity}: android.view.InflateException: Binary XML file line #8: Binary XML file line #8: Error inflating class android.support.v4.widget.NestedScrollView
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3003)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3064)
at android.app.ActivityThread.-wrap14(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1659)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6823)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1563)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1451)
Caused by: android.view.InflateException: Binary XML file line #8: Binary XML file line #8: Error inflating class android.support.v4.widget.NestedScrollView
Caused by: android.view.InflateException: Binary XML file line #8: Error inflating class android.support.v4.widget.NestedScrollView
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:430)
at android.view.LayoutInflater.createView(LayoutInflater.java:652)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:794)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:734)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:865)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:828)
at android.view.LayoutInflater.inflate(LayoutInflater.java:525)
at android.view.LayoutInflater.inflate(LayoutInflater.java:427)
at com.example.mukesh.nestedscrollsample.BlankFragment.onCreateView(BlankFragment.java:67)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:2425)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1460)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1784)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1852)
at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:802)
at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2623)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2410)
at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2365)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2272)
at android.support.v4.app.FragmentManagerImpl.dispatchStateChange(FragmentManager.java:3271)
at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:3227)
at android.support.v4.app.FragmentController.dispatchActivityCreated(FragmentController.java:201)
at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:610)
at android.support.v7.app.AppCompatActivity.onStart(AppCompatActivity.java:178)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1256)
at android.app.Activity.performStart(Activity.java:6994)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2956)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3064)
at android.app.ActivityThread.-wrap14(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1659)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6823)
at java.lang.reflect.Method.invoke(Native Method)
07-22 12:07:33.695 13199-13199/com.example.mukesh.nestedscrollsample E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1563)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1451)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.view.NestedScrollingChildHelper.setNestedScrollingEnabled(boolean)' on a null object reference
at android.support.v4.widget.NestedScrollView.setNestedScrollingEnabled(NestedScrollView.java:251)
at android.view.View.<init>(View.java:4877)
at android.view.ViewGroup.<init>(ViewGroup.java:582)
at android.widget.FrameLayout.<init>(FrameLayout.java:92)
at android.widget.FrameLayout.<init>(FrameLayout.java:87)
at android.support.v4.widget.NestedScrollView.<init>(NestedScrollView.java:198)
at android.support.v4.widget.NestedScrollView.<init>(NestedScrollView.java:193)
... 36 more
我需要什么： 在普通模式下，内部滚动条应该起作用，而在多窗口模式下，内部滚动条应该露出所有项目，而外部滚动条应该起作用。
我尝试在代码中将NestedScrollEnable设置为false，但无法正常工作。
答案 0 :(得分：0)
将嵌套的ScrollView替换为NestedScrollView。
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<ScrollView <-- This should be android.support.v4.widget.NestedScrollView -->
android:id="@+id/innerSroll"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
并使用app作为命名空间：app:nestedScrollingEnabled="true"。