I get "Program has stopped " when running my java code

Question

The following is the error:

I get this when. I Attempt to invoke virtual method void android.widget.ListView.setAdapter(android.widget.ListAdapter) on a null object reference

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.kerempc.odev, PID: 8573
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.kerempc.odev/com.example.kerempc.odev.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2778)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
        at android.app.ActivityThread.-wrap11(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6494)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference
        at com.example.kerempc.odev.MainFragment.onCreateView(MainFragment.java:25)
        at android.support.v4.app.Fragment.performCreateView(Fragment.java:2439)
        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:2625)
        at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2411)
        at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2366)
        at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2273)
        at android.support.v4.app.FragmentManagerImpl.dispatchStateChange(FragmentManager.java:3273)
        at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:3229)
        at android.support.v4.app.FragmentController.dispatchActivityCreated(FragmentController.java:201)
        at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:620)
        at android.support.v7.app.AppCompatActivity.onStart(AppCompatActivity.java:178)
        at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1334)
        at android.app.Activity.performStart(Activity.java:7029)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2741)

What should I do?

You should fix up your question so its readable and people will want to answer. make sure to provide all relavent info — , Dec 01 '18 at 22:45
I added edits try and inlcude mire info cuz nobody knwos what you are doing and how we can help — , Dec 01 '18 at 22:49
press command F then type edit and teh button will be highlighted... It is right bellow the tags you added to your question — , Dec 01 '18 at 22:55
This is your problem 'java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference'... NullPointerException. You need to share your code which is responsible for this functionality. — Nero, Dec 01 '18 at 23:00
I am trying to add my codes but it says "It looks like your post is mostly code; please add some more details." — Rauf Kerem Sarı, Dec 01 '18 at 23:19
@RaufKeremSarı - Well just post the **relevant** part of your code. — Stephen C, Dec 02 '18 at 02:37
Alternatively, read https://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it ... and debug your code yourself based on the advice given. — Stephen C, Dec 02 '18 at 02:39

score -1 · Answer 1 · answered Dec 01 '18 at 23:13

I suggest your ListAdapter object (somewhere in your code) is not instantiated right. As you can read the ListAdapter is null when you try to pass it to the setAdapter() method, that's why you get a NullPointerException.

It would be nice to post the code involving the adapter and the methods around it, so we can provide a more meaningful answer that solves your provlem.

I get "Program has stopped " when running my java code

1 Answers1