FATAL EXCEPTION: main
   Process: com.android.phone, PID: 2026
   java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.Object.toString()' on a null object reference
   	at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:453)
   	at android.widget.ArrayAdapter.getView(ArrayAdapter.java:415)
   	at android.widget.AbsListView.obtainView(AbsListView.java:2399)
   	at android.widget.ListView.measureHeightOfChildren(ListView.java:1484)
   	at android.widget.ListView.onMeasure(ListView.java:1391)
   	at android.view.View.measure(View.java:23230)
   	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6749)
   	at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
   	at android.view.View.measure(View.java:23230)
   	at com.android.internal.widget.AlertDialogLayout.tryOnMeasure(AlertDialogLayout.java:144)
   	at com.android.internal.widget.AlertDialogLayout.onMeasure(AlertDialogLayout.java:69)
   	at android.view.View.measure(View.java:23230)
   	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6749)
   	at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
   	at android.view.View.measure(View.java:23230)
   	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6749)
   	at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
   	at android.view.View.measure(View.java:23230)
   	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6749)
   	at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
   	at com.android.internal.policy.DecorView.onMeasure(DecorView.java:716)
   	at android.view.View.measure(View.java:23230)
   	at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2775)
   	at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1561)
   	at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1884)
   	at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1476)
   	at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7295)
   	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1004)
   	at android.view.Choreographer.doCallbacks(Choreographer.java:816)
   	at android.view.Choreographer.doFrame(Choreographer.java:751)
   	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:990)
   	at android.os.Handler.handleCallback(Handler.java:873)
   	at android.os.Handler.dispatchMessage(Handler.java:99)
   	at android.os.Looper.loop(Looper.java:217)
   	at android.app.ActivityThread.main(ActivityThread.java:6868)
   	at java.lang.reflect.Method.invoke(Native Method)
   	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
   	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

对应代码如下。数据源为getItem。说明adapter对应的ListItem位置的数据是空。

所以根本原因是将空数据放入了ListItem，或者ListItem数据改变，但是没有及时告知adapter，导致adapter认为对应位置还有数据。要找到当时什么应用工作在phone进程来进行优化。

网上找到两个相关的链接，也放在下面。

NullPointerException at android widget ArrayAdapter createViewFromResource - Stack Overflow
https://stackoverflow.com/questions/20170322/nullpointerexception-at-android-widget-arrayadapter-createviewfromresource

--》链接中建议如下：

It would be better if you check if any item is null before adding it to ListView .

int count = persons.getCount();
         Log.d(TAG, String.valueOf(count));
         for (int i = 0; i < count; i++) {
             /*====== this is where listView is populated =====*/
             if(persons.get(i).getDisplayName() != null) {
             sListItems.add(persons.get(i).getDisplayName());
惊现RecyclerView内部Bug？？？别急，我们慢慢解决它~
 http://www.apkbus.com/blog-898535-67963.html
 
这个链接是定义自己的LayoutManaer，然后onLayoutChildren时try catch异常。
                                    1   import java.util.ArrayList;
  2 import java.util.List;
  4 import android.content.Context;
  5 import android.view.LayoutInflater;
  6 import android.view.View;
  7 import android.vi...
                                    今年遇到的简单错误及解决办法汇总，用有道笔记写的，挺好用的，在遇到错误的过程中，简单记录，既可以方便下次解决问题，又可以给他人带来方便，是很好的习惯；1.Android Studio 添加assert目录 
在配置文件XXX.iml中写入 
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ArrayAdapter.createFromResource中的数组是放在xml的   arrays.xml中的
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at android.widget.ArrayAdapter.createViewFromResource(ArrayA