Unable to start activity caused by NullPointerException at ContextImpl.openFileOutput

[Adil Hussain]

I've released an app which uses the Android Compatibility Library for Google Maps and I've received some odd "Unable to start activity" crash reports.

I've pasted a couple of sample stack traces below. Anyone else experienced this or know how I might be able to avoid it?

***** Example stack trace 1 *****

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mycompany.myapp/com.mycompany.myapp.activities.GameActivity}: java.lang.NullPointerException

...

caused by java.lang.NullPointerException

 at android.app.ContextImpl.openFileOutput(ContextImpl.java:430)

 at android.content.ContextWrapper.openFileOutput(ContextWrapper.java:158)

 at com.google.common.io.android.AndroidPersistentStore.writeBlockX(Unknown Source)

 at com.google.common.io.android.AndroidPersistentStore.writeBlock(Unknown Source)

 at com.google.common.io.PreferenceStore.ensurePreferencesLoaded(Unknown Source)

 at com.google.common.io.PreferenceStore.readPreference(Unknown Source)

 at com.google.common.io.BasePersistentStore.readPreference(Unknown Source)

 at com.google.common.StaticUtil.readPreferenceAsDataInput(Unknown Source)

 at com.google.googlenav.datarequest.DataRequestDispatcher.loadOrRequestCookie(Unknown Source)

 at com.google.googlenav.datarequest.DataRequestDispatcher.<init>(Unknown Source)

 at com.google.googlenav.datarequest.DataRequestDispatcher.createInstance(Unknown Source)

 at com.google.android.maps.MapActivity.createMap(MapActivity.java:509)

 at com.google.android.maps.MapActivity.onCreate(MapActivity.java:409)

 at android.support.v4.app.FragmentActivity.onCreate(Unknown Source)

 at com.mycompany.myapp.activities.GameActivity.onCreate(Unknown Source)

 at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)

 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)

*** Example stack trace 2 **

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mycompany.myapp/com.mycompany.myapp.activities.GameActivity}: java.lang.NullPointerException

...

Caused by: java.lang.NullPointerException

 at android.app.ContextImpl.openFileOutput(ContextImpl.java:423)

 at android.content.ContextWrapper.openFileOutput(ContextWrapper.java:158)

 at android_maps_conflict_avoidance.com.google.common.io.android.AndroidPersistentStore.writeBlockX(AndroidPersistentStore.java:140)

 at android_maps_conflict_avoidance.com.google.common.io.android.AndroidPersistentStore.writeBlock(AndroidPersistentStore.java:169)

 at android_maps_conflict_avoidance.com.google.common.io.PreferenceStore.ensurePreferencesLoaded(PreferenceStore.java:178)

 at android_maps_conflict_avoidance.com.google.common.io.PreferenceStore.readPreference(PreferenceStore.java:86)

 at android_maps_conflict_avoidance.com.google.common.io.BasePersistentStore.readPreference(BasePersistentStore.java:41)

 at android_maps_conflict_avoidance.com.google.common.StaticUtil.readPreferenceAsDataInput(StaticUtil.java:271)

 at android_maps_conflict_avoidance.com.google.googlenav.datarequest.DataRequestDispatcher.loadOrRequestCookie(DataRequestDispatcher.java:493)

 at android_maps_conflict_avoidance.com.google.googlenav.datarequest.DataRequestDispatcher.<init>(DataRequestDispatcher.java:390)

 at android_maps_conflict_avoidance.com.google.googlenav.datarequest.DataRequestDispatcher.createInstance(DataRequestDispatcher.java:341)

 at com.google.android.maps.MapActivity.createMap(MapActivity.java:548)

 at com.google.android.maps.MapActivity.onCreate(MapActivity.java:422)

 at android.support.v4.app.FragmentActivity.onCreate(Unknown Source)

 at com.mycompany.myapp.activities.GameActivity.onCreate(Unknown Source)

 at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)

 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1709)

*****

Regards,

Adil

[Adil Hussain]

I've posted this question on StackOverflow just now as well:

http://stackoverflow.com/questions/11055037