NullPointerException: int android.support.v4.app.FragmentManagerImpl.mCurState null object reference

Question

I updated my application with Android L, and I have this exception, which I cannot understand:

NullPointerException: attempt to read from the field 'int android.support.v4.app.FragmentManagerImpl.mCurState' in relation to a reference to a null object

Can anybody help me?

in the build.gradle file:

dependencies { compile files('libs/libGoogleAnalyticsServices.jar') compile 'com.android.support:support-v4:21.0.3' compile 'com.android.support:appcompat-v7:21.0.3' compile 'com.google.android.gms:play-services:6.5.87' } 

Stacktrace:

 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.lucagrillo.myapp/com.lucagrillo.myapp.MainActivity}: android.view.InflateException: Binary XML file line #23: Error inflating class fragment at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360) at android.app.ActivityThread.access$800(ActivityThread.java:144) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278) at android.os.Handler.dispatchMessage(Handler.java:102) 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) Caused by: android.view.InflateException: Binary XML file line #23: Error inflating class fragment at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:763) at android.view.LayoutInflater.rInflate(LayoutInflater.java:806) at android.view.LayoutInflater.inflate(LayoutInflater.java:511) at android.view.LayoutInflater.inflate(LayoutInflater.java:414) at android.view.LayoutInflater.inflate(LayoutInflater.java:365) at android.support.v7.app.ActionBarActivityDelegateBase.setContentView(ActionBarActivityDelegateBase.java:229) at android.support.v7.app.ActionBarActivity.setContentView(ActionBarActivity.java:103) at com.lucagrillo.myapp.MainActivity.onCreate(MainActivity.java:153) at android.app.Activity.performCreate(Activity.java:5933) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251) ... 10 more Caused by: java.lang.NullPointerException: Attempt to read from field 'int android.support.v4.app.FragmentManagerImpl.mCurState' on a null object reference at android.support.v4.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2182) at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:297) at android.support.v7.app.ActionBarActivity.onCreateView(ActionBarActivity.java:547) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:727) ... 20 more 

Thank you very much

Answer 1

Your problem is probably in the action bar. but you must also publish your XML file and MainActivity so that we can understand the problem.