Android NullPointerException in a View or in an Adapter or

Question

I don't know where else to look, I'm getting crazy with this error. It's not coming from using a null variable and it appeared just restarting an app without changing any of the code. Anyone knows?

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:394)
        at android.widget.ArrayAdapter.getView(ArrayAdapter.java:362)
        at android.widget.AbsListView.obtainView(AbsListView.java:2344)
        at android.widget.ListView.makeAndAddView(ListView.java:1864)
        at android.widget.ListView.fillDown(ListView.java:698)
        at android.widget.ListView.fillFromTop(ListView.java:759)
        at android.widget.ListView.layoutChildren(ListView.java:1673)
        at android.widget.AbsListView.onLayout(AbsListView.java:2148)
        at android.view.View.layout(View.java:15596)
        at android.view.ViewGroup.layout(ViewGroup.java:4966)
        at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:911)
        at android.view.View.layout(View.java:15596)
        at android.view.ViewGroup.layout(ViewGroup.java:4966)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
        at android.view.View.layout(View.java:15596)
        at android.view.ViewGroup.layout(ViewGroup.java:4966)
        at com.android.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:494)
        at android.view.View.layout(View.java:15596)
        at android.view.ViewGroup.layout(ViewGroup.java:4966)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
        at android.view.View.layout(View.java:15596)
        at android.view.ViewGroup.layout(ViewGroup.java:4966)
        at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2072)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1829)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1054)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5779)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
        at android.view.Choreographer.doCallbacks(Choreographer.java:580)
        at android.view.Choreographer.doFrame(Choreographer.java:550)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
        at android.os.Handler.handleCallback(Handler.java:739)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5221)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

The lines where it happens

ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, android.R.id.text1, values);
    mDrawerList.setAdapter(adapter);

You should pot your adapter code, the line where this happens. — Leonardo, Dec 28 '14 at 16:21
Check this http://stackoverflow.com/questions/24706170/nullpointerexception-with-string-array-in-spinner — Ganesh AB, Dec 28 '14 at 16:23
I think you are triyng to call *toString()* method of a null object. Please post your code. — Rami, Dec 28 '14 at 16:28
`java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.Object.toString()' on a null object reference` - **It's not coming from using a null variable** - yes it is! You are adding a null object to your listview. — Simon, Dec 28 '14 at 16:31
values is null. Post the test of your code and we can tell you why. — iheanyi, Dec 28 '14 at 20:39

score 5 · Answer 1 · answered Sep 06 '16 at 18:26

5

Although the question is years old, I want to post my answer, it can help other people in the future with this problem because there are no answers yet.

Check if there are null objects invalues. For example, String[5] with only 4 set elements will cause this error, because ArrayAdapter is calling toString() internally on all elements.

answered Sep 06 '16 at 18:26

SapuSeven

1,473
17
30

eg i was adding a list(100 size but just one vale, rest all were null) to adapter the null were giving error toString internal function of adapter. Hope this helps someone else ( i was stuck for 8 hours on silly non explanatory error) – Lakhwinder Singh Dhillon Jan 09 '17 at 06:14

Android NullPointerException in a View or in an Adapter or

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