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：

  1. 07-26 17:58:44.030: D/AndroidRuntime(10889): Shutting down VM
  2. 07-26 17:58:44.030: W/dalvikvm(10889): threadid=1: thread exiting with uncaught exception (group=0x40fca9a8)
  3. 07-26 17:58:44.050: E/AndroidRuntime(10889): FATAL EXCEPTION: main
  4. 07-26 17:58:44.050: E/AndroidRuntime(10889): java.lang.NullPointerException
  5. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.widget.ScrollBarDrawable.setAlpha(ScrollBarDrawable.java:221)
  6. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.onDrawScrollBars(View.java:11439)
  7. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.draw(View.java:13809)
  8. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.widget.FrameLayout.draw(FrameLayout.java:467)
  9. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.widget.ScrollView.draw(ScrollView.java:1579)
  10. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12741)
  11. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12785)
  12. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.draw(View.java:13519)
  13. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.drawChild(ViewGroup.java:3019)
  14. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2883)
  15. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12739)
  16. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12785)
  17. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.draw(View.java:13519)
  18. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.drawChild(ViewGroup.java:3019)
  19. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2883)
  20. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.draw(View.java:13806)
  21. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12741)
  22. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12785)
  23. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.draw(View.java:13519)
  24. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.drawChild(ViewGroup.java:3019)
  25. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.support.v4.widget.DrawerLayout.drawChild(DrawerLayout.java:1089)
  26. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2883)
  27. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12739)
  28. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12785)
  29. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.draw(View.java:13519)
  30. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.drawChild(ViewGroup.java:3019)
  31. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2883)
  32. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12739)
  33. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12785)
  34. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.draw(View.java:13519)
  35. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.drawChild(ViewGroup.java:3019)
  36. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2883)
  37. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12739)
  38. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12785)
  39. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.draw(View.java:13519)
  40. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.drawChild(ViewGroup.java:3019)
  41. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2883)
  42. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.draw(View.java:13806)
  43. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.widget.FrameLayout.draw(FrameLayout.java:467)
  44. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:2240)
  45. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12741)
  46. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.View.getDisplayList(View.java:12785)
  47. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.HardwareRenderer$GlRenderer.draw(HardwareRenderer.java:1249)
  48. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewRootImpl.draw(ViewRootImpl.java:2480)
  49. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2340)
  50. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2142)
  51. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1139)
  52. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4879)
  53. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:776)
  54. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.Choreographer.doCallbacks(Choreographer.java:579)
  55. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.Choreographer.doFrame(Choreographer.java:548)
  56. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:762)
  57. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.os.Handler.handleCallback(Handler.java:725)
  58. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.os.Handler.dispatchMessage(Handler.java:92)
  59. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.os.Looper.loop(Looper.java:153)
  60. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at android.app.ActivityThread.main(ActivityThread.java:5299)
  61. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at java.lang.reflect.Method.invokeNative(Native Method)
  62. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at java.lang.reflect.Method.invoke(Method.java:511)
  63. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
  64. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
  65. 07-26 17:58:44.050: E/AndroidRuntime(10889):     at dalvik.system.NativeStart.main(Native Method)
  66. 07-26 17:58:44.245: I/System.out(10889): [CDS]close[39632]
  67. 07-26 17:58:44.245: I/System.out(10889): close [socket][/0.0.0.0:39632]
  68. 07-26 17:58:44.246: I/System.out(10889): close [socket][/0.0.0.0:39632]
  69. 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）。

  1. <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
  2.     android:id="@+id/layout_home"
  3.     android:layout_width="match_parent"
  4.     android:layout_height="match_parent"
  5.     android:fillViewport="true"
  6.     android:scrollbarSize="2dp"
  7.     android:scrollbarThumbVertical="@null"
  8.     android:scrollbars="vertical" >
  9.  
  10.     <LinearLayout
  11.         android:layout_width="match_parent"
  12.         android:layout_height="wrap_content"
  13.         android:orientation="vertical" >
  14.  
  15.         <!-- 消息/公告区域 -->
  16.         <include layout="@layout/activity_home_message" />
  17.  
  18.         <!-- RecyclerView列表 -->
  19.         <android.support.v7.widget.RecyclerView
  20.             android:id="@+id/home_gridview"
  21.             android:layout_width="match_parent"
  22.             android:layout_height="match_parent"
  23.             android:layout_marginLeft="@dimen/home_grid_margin"
  24.             android:layout_marginRight="@dimen/home_grid_margin"
  25.             android:cacheColorHint="#00000000"
  26.             android:divider="@null"
  27.             android:listSelector="#00000000"
  28.             android:overScrollMode="never"
  29.             android:scrollbars="none" />
  30.     </LinearLayout>
  31.  
  32. </ScrollView>

解决方案：

去掉ScrollView。

  1. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  2.     android:id="@+id/layout_home"
  3.     android:layout_width="match_parent"
  4.     android:layout_height="match_parent"
  5.     android:fillViewport="true"
  6.     android:scrollbarSize="2dp"
  7.     android:scrollbarThumbVertical="@null"
  8.     android:scrollbars="vertical" >
  9.  
  10.     <!-- 消息/公告区域 -->
  11.     <include layout="@layout/activity_home_message" />
  12.  
  13.     <!-- RecyclerView列表 -->
  14.     <android.support.v7.widget.RecyclerView
  15.         android:id="@+id/home_gridview"
  16.         android:layout_width="match_parent"
  17.         android:layout_height="match_parent"
  18.         android:layout_marginLeft="@dimen/home_grid_margin"
  19.         android:layout_marginRight="@dimen/home_grid_margin"
  20.         android:cacheColorHint="#00000000"
  21.         android:divider="@null"
  22.         android:listSelector="#00000000"
  23.         android:overScrollMode="never"
  24.         android:scrollbars="none" />
  25.  
  26. </LinearLayout>

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