Develop Reference

Unable to destroy activity Android: Google Play Console Error

I am trying to launch my app into Production on Google Playstore. I have used Flutter to create the app. But in the pre-launch report I am getting error:
Stacktrace:
java.lang.RuntimeException: Unable to destroy activity {com.stech.ebox_expenses/com.example.ebox_expenses.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.lifecycle.e.c(androidx.lifecycle.h)' on a null object reference
FATAL EXCEPTION: main
Process: com.stech.ebox_expenses, PID: 12391
java.lang.RuntimeException: Unable to destroy activity {com.stech.ebox_expenses/com.example.ebox_expenses.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.lifecycle.e.c(androidx.lifecycle.h)' on a null object reference
at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:4504)
at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:4522)
at android.app.ActivityThread.-wrap5(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1697)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6647)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:811)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.lifecycle.e.c(androidx.lifecycle.h)' on a null object reference
at com.mr.flutter.plugin.filepicker.FilePickerPlugin.j(Unknown Source:21)
at com.mr.flutter.plugin.filepicker.FilePickerPlugin.e(Unknown Source:0)
at io.flutter.embedding.engine.c.h(Unknown Source:54)
at io.flutter.embedding.android.f.o(Unknown Source:58)
at io.flutter.embedding.android.e.G(Unknown Source:7)
at io.flutter.embedding.android.e.onDestroy(Unknown Source:11)
at android.app.Activity.performDestroy(Activity.java:7241)
at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1271)
at androidx.test.runner.MonitoringInstrumentation.callActivityOnDestroy(MonitoringInstrumentation.java:1)
at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:4491)
... 9 more
I try to find anything discussing this and I found one Stackoverflow question which was recieved badly and downvoted; Here's a ref to the post. I am not to sure why this is happening and I am not sure whether it is external problem which I can fix or an internal bug.
When I downloaded the app from the Playstore when it was production, it displayed a white screen when I opened it and stayed like this. I am not sure if me getting this error is a result of that or not either.
Any help on the matter will be appreciated!

I have managed to fix both problems which I was having. I fixed the first problem of this error by updating file_picker library to version 2.10. The issue was fixed in version 2.0.12. I also fixed the second issue of the white screen in the app when it started by downgrading to: classpath 'com.android.tools.build:gradle:3.4.3'. Here's the reference to the post which helped me.

System UI has stopped emulator when requesting permissions

When request permissions, the system show an error message, "System UI has stopped" and keeps restarting until you give the permissions;
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.android.systemui, PID: 3910
java.lang.NullPointerException: Attempt to invoke virtual method 'void com.android.systemui.statusbar.phone.NavigationBarFragment.onKeyguardOccludedChanged(boolean)' on a null object reference
at com.android.systemui.statusbar.phone.StatusBar.onKeyguardOccludedChanged(StatusBar.java:3843)
at com.android.systemui.statusbar.phone.StatusBarKeyguardViewManager.setOccluded(StatusBarKeyguardViewManager.java:277)
at com.android.systemui.keyguard.KeyguardViewMediator.handleSetOccluded(KeyguardViewMediator.java:1176)
at com.android.systemui.keyguard.KeyguardViewMediator.-wrap14(Unknown Source:0)
at com.android.systemui.keyguard.KeyguardViewMediator$4.handleMessage(KeyguardViewMediator.java:1531)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
I've tried those answers[1][2], none of them solved my problem.
This is happening only in the emulator, on physical devices it's OK;
[1] Unfortunately System UI has stopped
[2] Android Studio gradle Error: your emulator is out of date

May be its too late but this might help others, its a bug on the emulator's soft buttons, the workaround is to increase the resolution of the emulator and don't forget to add soft-button.
This helped me out

NullPointer on toLowerCase but I don't use that method anywhere

I'm getting the following crash dump in Firebase Crash Reports:
Exception java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.String.toLowerCase(java.util.Locale)' on a null object reference
bnp.run (bnp.java:56)
java.lang.Thread.run (Thread.java:818)
The problem is that I don't use the String.toLowerCase() method anywhere in the project. In Android Studio, I did Edit->Find In Path for the method and got no results, however, it does appear 100+ times if I search in the libraries. But I cannot find the "bnp.java" anywhere.
Thanks for your help!
Edit: A previous crash report was not proguard-affected and revealed it may be due to google-play-services or Firebase. I only use gms:play-services-places and gms:play-services-auth in my app, along with many Firebase dependencies.
Exception java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.String.toLowerCase(java.util.Locale)' on a null object reference
bnp.run (:com.google.android.gms.DynamiteModulesC:56)
java.lang.Thread.run (Thread.java:818)

I can't comment yet, so I will post this as a possible solution, but this seems like an error on Google's side. Multiple people are reporting this crash on the exact same device with the exact same region. So it seems Google runs your app on a virtual or automated device and then that device crashes. This device seems to be a Nexus 5x with local us-US and API level 23.
Source: https://code.google.com/p/android/issues/detail?id=233549

I got this error when my code was trying to create a connection to certain amqp service using an invalid URL. Once I modified it to the proper value, the exception is gone. So check your code.

My app ran into a similar issue.
When launched in Stock android devices(Mi A1), the App crashed with " keeps stopping popup". The Crashlytics in Fabric reported it as the
Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.String.toLowerCase(java.util.Locale)' on a null object reference
at bfx.run(:com.google.android.gms.dynamite_dynamitemodulesc#13452060#13.4.52 (040708-202483333):80)
at java.lang.Thread.run(Thread.java:818)
But when I checked the Pre-launch report of the Release management in Google Play Console, it showed that the app was crashing for Pixel & Pixel 2 for an entirely different reason. The issue shown was
FATAL EXCEPTION: main Process: in.quickall.quickall, PID: 8345
java.lang.RuntimeException: Unable to start activity ComponentInfo{in.quickall.quickall/in.quickall.quickall.Main.MainActivity}: android.content.res.Resources$NotFoundException: Drawable in.quickall.quickall:drawable/splash_screen with resource ID #0x7f0700c0
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
And the issue started from the APK version were I implemented the code (given below) to remove the white screen on launch.
<style name="SplashTheme" parent="AppTheme">
<item name="android:windowBackground">#drawable/splash_screen</item>
</style>
I removed this piece of code and now the Pre-launch report shows it as working fine in the Pixel devices.
Now the app launches correctly, but has to have the white screen at launch.

NULL pointer error in production only on first start

I currently have an issue when I deploy my Titanium alloy application to the play store, when I launch it for the first time it crashes. This only happens in production.
When I reported the issue the following is what I found in the developer console:
java.lang.NullPointerException: Attempt to invoke virtual method
'android.content.res.Resources android.content.Context.getResources()'
on a null object reference at
android.view.ViewConfiguration.get(ViewConfiguration.java:359) at
android.view.View.(View.java:3663) at
android.view.View.(View.java:3758) at
android.widget.TextView.(TextView.java:650) at
android.widget.TextView.(TextView.java:645) at
android.widget.TextView.(TextView.java:641) at
android.widget.TextView.(TextView.java:637) at
ti.modules.titanium.ui.widget.TiUILabel$1.(TiUILabel.java:58)
at ti.modules.titanium.ui.widget.TiUILabel.(TiUILabel.java:57)
at ti.modules.titanium.ui.LabelProxy.createView(LabelProxy.java:63)
at
org.appcelerator.titanium.proxy.TiViewProxy.handleGetView(TiViewProxy.java:490)
at
org.appcelerator.titanium.proxy.TiViewProxy.getOrCreateView(TiViewProxy.java:476)
at
org.appcelerator.titanium.proxy.TiViewProxy.handleToImage(TiViewProxy.java:965)
at
org.appcelerator.titanium.proxy.TiViewProxy.handleMessage(TiViewProxy.java:280)
at android.os.Handler.dispatchMessage(Handler.java:98) at
android.os.Looper.loop(Looper.java:211) at
android.app.ActivityThread.main(ActivityThread.java:5373) at
java.lang.reflect.Method.invoke(Native Method) at
java.lang.reflect.Method.invoke(Method.java:372) at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)
Since I don't know where excalty it went wrong since it is in production I don't know what code to supply. I understand it is a null reference error, but nowhere in my application I use a getResources() function, or something like that.
The second time I run it it just works
Titanium Version: 6.0.1.GA
Mac OS X: 10.12.3
Target android SDK: 23
Android version: 5.1
Any help would be appriciated!

App generating java.lang.NullPointerException when compiled on different developer machine

I have an application that compiles and runs fine when run on a machine X.
We check the code out compile and run it on machine Y and it generates a null pointer exception.
The Null pointer exception is listed below the main body.
I have investigated and the code is failing when a findViewById() call is executed on an edit text box.
The call has an id (integer) but returns a null in the place of the view.
We have tried cleaning and rebuilding the project but this does not seem to resolve the problem.
I believe the problem may some how be related to R.java identifiers being corrupted on the new install.
09-08 15:50:10.186 28278-28278/ca.client.crmlogon E/ACRA: ACRA caught a RuntimeException for ca.client.crmlogon
java.lang.RuntimeException: Unable to start activity ComponentInfo{ca.client.crmlogon/ca.client.crmlogon.Activities.WorkOrderActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setVisibility(int)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2790)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2855)
at android.app.ActivityThread.access$900(ActivityThread.java:181)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1474)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6117)
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:1399)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setVisibility(int)' on a null object reference
at ca.client.crmlogon.Activities.GUIFormActivity.hideFieldById(GUIFormActivity.java:690)
at ca.client.crmlogon.Activities.GUIFormActivity.hideFieldByName(GUIFormActivity.java:697)
at ca.client.crmlogon.Activities.WorkOrderActivity.hideAgreementSection(WorkOrderActivity.java:1604)
at ca.client.crmlogon.Activities.WorkOrderActivity.loadServiceAppointment(WorkOrderActivity.java:2026)
at ca.client.crmlogon.Activities.WorkOrderActivity.onCreate(WorkOrderActivity.java:515)
at android.app.Activity.performCreate(Activity.java:6374)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2743)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2855)�
at android.app.ActivityThread.access$900(ActivityThread.java:181)�
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1474)�
at android.os.Handler.dispatchMessage(Handler.java:102)�
at android.os.Looper.loop(Looper.java:145)�
at android.app.ActivityThread.main(ActivityThread.java:6117)�
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:1399)�
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)

You may be missing some files. If you transfered it using Git, make sure all your files were added before your last commit/push.
If you transfered it over a USB stick, etc. you may have accidentally removed the device before the transfer was complete.
My first suggestion is to try the transfer again, making sure you didn't miss any files.