今天在项目开发中碰到了这样一个问题：

　　项目在Nexus5【Android 6.0】上面运行正常，在华为荣耀6【Android 4.4.2】上面运行到指定activity崩溃（不是应用启动崩溃）；然后后台日志报错：

07-26 17:58:44.030: D/AndroidRuntime(10889): Shutting down VM

07-26 17:58:44.030: W/dalvikvm(10889): threadid=1: thread exiting with uncaught exception (group=0x40fca9a8)

07-26 17:58:44.050: E/AndroidRuntime(10889): FATAL EXCEPTION: main

07-26 17:58:44.050: E/AndroidRuntime(10889): java.lang.NullPointerException

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.widget.ScrollBarDrawable.setAlpha(ScrollBarDrawable.java:221)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.onDrawScrollBars(View.java:11439)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.draw(View.java:13809)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.widget.FrameLayout.draw(FrameLayout.java:467)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.widget.ScrollView.draw(ScrollView.java:1579)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12741)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12785)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.draw(View.java:13519)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.drawChild(ViewGroup.java:3019)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2883)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12739)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12785)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.draw(View.java:13519)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.drawChild(ViewGroup.java:3019)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2883)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.draw(View.java:13806)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12741)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12785)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.draw(View.java:13519)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.drawChild(ViewGroup.java:3019)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.support.v4.widget.DrawerLayout.drawChild(DrawerLayout.java:1089)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2883)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12739)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12785)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.draw(View.java:13519)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.drawChild(ViewGroup.java:3019)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2883)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12739)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12785)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.draw(View.java:13519)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.drawChild(ViewGroup.java:3019)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2883)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12739)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12785)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.draw(View.java:13519)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.drawChild(ViewGroup.java:3019)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2883)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.draw(View.java:13806)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.widget.FrameLayout.draw(FrameLayout.java:467)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:2240)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12741)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12785)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.HardwareRenderer$GlRenderer.draw(HardwareRenderer.java:1249)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewRootImpl.draw(ViewRootImpl.java:2480)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2340)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2142)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1139)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4879)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:776)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.Choreographer.doCallbacks(Choreographer.java:579)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.Choreographer.doFrame(Choreographer.java:548)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:762)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.os.Handler.handleCallback(Handler.java:725)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.os.Handler.dispatchMessage(Handler.java:92)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.os.Looper.loop(Looper.java:153)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.app.ActivityThread.main(ActivityThread.java:5299)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at java.lang.reflect.Method.invokeNative(Native Method)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at java.lang.reflect.Method.invoke(Method.java:511)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)

07-26 17:58:44.050: E/AndroidRuntime(10889):     at dalvik.system.NativeStart.main(Native Method)

07-26 17:58:44.245: I/System.out(10889): [CDS]close[39632]

07-26 17:58:44.245: I/System.out(10889): close [socket][/0.0.0.0:39632]

07-26 17:58:44.246: I/System.out(10889): close [socket][/0.0.0.0:39632]

07-26 17:58:44.712: D/dalvikvm(10889): threadid=20: interp stack at 0x54535000

问题原因：

scrollView中嵌套RecyclerView导致的。（为什么要在scrollView中嵌套RecyclerView，因为想要实现RecyclerVIew和上面的消息区域一块滑动）。

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

    android:id="@+id/layout_home"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:fillViewport="true"

    android:scrollbarSize="2dp"

    android:scrollbarThumbVertical="@null"

    android:scrollbars="vertical" >

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:orientation="vertical" >

        <!-- 消息/公告区域 -->

        <include layout="@layout/activity_home_message" />

        <!-- RecyclerView列表 -->

        <android.support.v7.widget.RecyclerView

            android:id="@+id/home_gridview"

            android:layout_width="match_parent"

            android:layout_height="match_parent"

            android:layout_marginLeft="@dimen/home_grid_margin"

            android:layout_marginRight="@dimen/home_grid_margin"

            android:cacheColorHint="#00000000"

            android:divider="@null"

            android:listSelector="#00000000"

            android:overScrollMode="never"

            android:scrollbars="none" />

    </LinearLayout>

</ScrollView>

解决方案：

去掉ScrollView。

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

    android:id="@+id/layout_home"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:fillViewport="true"

    android:scrollbarSize="2dp"

    android:scrollbarThumbVertical="@null"

    android:scrollbars="vertical" >

    <!-- 消息/公告区域 -->

    <include layout="@layout/activity_home_message" />

    <!-- RecyclerView列表 -->

    <android.support.v7.widget.RecyclerView

        android:id="@+id/home_gridview"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:layout_marginLeft="@dimen/home_grid_margin"

        android:layout_marginRight="@dimen/home_grid_margin"

        android:cacheColorHint="#00000000"

        android:divider="@null"

        android:listSelector="#00000000"

        android:overScrollMode="never"

        android:scrollbars="none" />

</LinearLayout>

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