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My Activity is getting null object exception when the app resumes after bing in the background

I have an android app that has a second module included in the app when the main activity starts an activity in the module everything is good. The problem is if you go to another app and then resume this app the activity crashes with a null object pointer. My app uses Esri ArcGIS runtime SDK. I have a MapView open in the activity when the crash occurs. I don't have any problem with an open map in the MainActivity and the app goes to the background then back to the current app.
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.thevillages.myfirstapp, PID: 23267
java.lang.RuntimeException: Unable to resume activity {com.thevillages.myfirstapp/com.thevillages.maplib.MapNavActivity}: com.esri.arcgisruntime.ArcGISRuntimeException: Null pointer.: object cannot be null.
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:4205)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:4237)
at android.app.servertransaction.ResumeActivityItem.execute(ResumeActivityItem.java:52)
at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:176)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: com.esri.arcgisruntime.ArcGISRuntimeException: Null pointer.: object cannot be null.
at com.esri.arcgisruntime.internal.jni.CoreGeoView.nativeResume(Native Method)
at com.esri.arcgisruntime.internal.jni.CoreGeoView.b(SourceFile:5)
at com.esri.arcgisruntime.a.i.f.g.d(SourceFile:3)
at com.esri.arcgisruntime.mapping.view.GeoView$RenderingThread.resume(SourceFile:4)
at com.esri.arcgisruntime.mapping.view.MapView.resume(SourceFile:1)
at com.thevillages.maplib.MapNavActivity.onResume(MapNavActivity.java:816)
at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1446)
at android.app.Activity.performResume(Activity.java:7939)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:4195)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:4237) 
at android.app.servertransaction.ResumeActivityItem.execute(ResumeActivityItem.java:52) 
at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:176) 
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016) 
at android.os.Handler.dispatchMessage(Handler.java:107) 
at android.os.Looper.loop(Looper.java:214) 
at android.app.ActivityThread.main(ActivityThread.java:7356) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)

I systematically went through my onCreate() method and added each piece of the code to find where the problem was. I found some code that was suspicious and I could not recall why I added the code. With the code removed the app works fine.

MalformedURLException: unknown protocol: android

I was trying to adapt the code from this: 3D-model-viewer to my app because I want to insert some models from that kind to show human anatomy.
Everything seems fine, I first cloned and tried the original repository, it worked, so I started using that code.
After adapting and checking everything's okay and there are no errors marked, I ran the app, but there seems to be an issue. In the original code, the person saves a url like this:
url = new URL("android://org.andresoviedo.dddmodel2/assets/" + parent.getParamAssetDir() + File.separator + parent.getParamAssetFilename());
I already changed the first part to my project:
url = new URL("android://com.example.ovman.appbotox/assets/" + parent.getParamAssetDir() + File.separator + parent.getParamAssetFilename());
so I don't think is that, algo I inserted some logs to verify the params aren't null.
The class in github is here: SceneLoader.java
So, when I get to that point, the Logcat says "unkown protocol: andorid".
Here's the complete logcat:
06-26 17:34:26.304 26616-26616/com.example.ovman.appbotox E/SceneLoader: unknown protocol: android
java.net.MalformedURLException: unknown protocol: android
at java.net.URL.<init>(URL.java:608)
at java.net.URL.<init>(URL.java:498)
at java.net.URL.<init>(URL.java:447)
at com.example.ovman.appbotox.model3D.services.SceneLoader.init(SceneLoader.java:118)
at com.example.ovman.appbotox.ZonesActivity.onCreate(ZonesActivity.java:108)
at android.app.Activity.performCreate(Activity.java:7131)
at android.app.Activity.performCreate(Activity.java:7122)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2882)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3037)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1797)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6642)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
06-26 17:34:26.533 26616-26616/com.example.ovman.appbotox E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.ovman.appbotox, PID: 26616
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.ovman.appbotox/com.example.ovman.appbotox.ZonesActivity}: java.lang.RuntimeException: java.net.MalformedURLException: unknown protocol: android
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2902)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3037)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1797)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6642)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: java.lang.RuntimeException: java.net.MalformedURLException: unknown protocol: android
at com.example.ovman.appbotox.model3D.services.SceneLoader.init(SceneLoader.java:124)
at com.example.ovman.appbotox.ZonesActivity.onCreate(ZonesActivity.java:108)
at android.app.Activity.performCreate(Activity.java:7131)
at android.app.Activity.performCreate(Activity.java:7122)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2882)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3037) 
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) 
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) 
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1797) 
at android.os.Handler.dispatchMessage(Handler.java:106) 
at android.os.Looper.loop(Looper.java:193) 
at android.app.ActivityThread.main(ActivityThread.java:6642) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) 
Caused by: java.net.MalformedURLException: unknown protocol: android
at java.net.URL.<init>(URL.java:608)
at java.net.URL.<init>(URL.java:498)
at java.net.URL.<init>(URL.java:447)
at com.example.ovman.appbotox.model3D.services.SceneLoader.init(SceneLoader.java:118)
at com.example.ovman.appbotox.ZonesActivity.onCreate(ZonesActivity.java:108) 
at android.app.Activity.performCreate(Activity.java:7131) 
at android.app.Activity.performCreate(Activity.java:7122) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2882) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3037) 
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) 
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) 
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1797) 
at android.os.Handler.dispatchMessage(Handler.java:106) 
at android.os.Looper.loop(Looper.java:193) 
at android.app.ActivityThread.main(ActivityThread.java:6642) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
 
My repository is this, the app runs, there are no errors marked, just when selecting the 3rd option in my menu (it's the first screen) it crashes.
I kept the url line like that since I didn't know if the "android://" part was really important or not.
What do you think I should change or do you know what that error means? Do I need to import anything? I checked the original project (manifest, folder structure, gradle) and everything is similar, so I don't know where the mistake lies.
At the end, what I want is to access my assets folder to show some .obj files. And for the URL, I know that for links you should put a protocol, but I don't get why the protocol android isn't working for getting something in one of my project paths.
EDIT:
In my repository I made some changes to get the obj file, still, if someone could tell me (as the modification hadn't anything to do with the url) how to manage that about the android protocol. I checked this link: URL but I couldn't find much.

The "android" protocol is handled by a custom handler.
// Custom handler: org/andresoviedo/app/util/url/android/Handler.class
System.setProperty("java.protocol.handler.pkgs", "org.andresoviedo.app.util.url");
It is possible that for some reason, the System property that registers the custom handler is not working. So to force java to handle custom protocol, you can do it like this:
URL.setURLStreamHandlerFactory(new URLStreamHandlerFactory() {
#Override
public URLStreamHandler createURLStreamHandler(String protocol) {
if ("android".equals(protocol)){
return new Handler();
}
return null;
}
});

Just use java.net.URI instead of java.net.URL
UPDATE
Consider this

Quickblox: Android Video Calling Shows java.lang.NoSuchMethodError: No static method registerComplexPropertyParser

Used native-libs.jar. Following the same method as given in the sample. Currently using quickblox-android-sdk-videochat-webrtc-2.4. Trying using the sample code QBRTCClient shows the below error message:
java.lang.NoSuchMethodError: No static method registerComplexPropertyParser(Ljava/lang/String;Lcom/quickblox/chat/propertyparsers/MessagePropertyParser;)V in class Lcom/quickblox/chat/model/QBChatMessageExtension; or its super classes (declaration of 'com.quickblox.chat.model.QBChatMessageExtension' appears in /data/app/xxx.xxx.xxx/base.apk)
at com.quickblox.videochat.webrtc.RTCSignallingMessageProcessor.<clinit>(RTCSignallingMessageProcessor.java:38)
at com.quickblox.videochat.webrtc.QBRTCClient.<init>(QBRTCClient.java:93)
at com.quickblox.videochat.webrtc.QBRTCClient.getInstance(QBRTCClient.java:124)
at xxx.xxx.xxx.Activity.CallActivity.initQBRTCClient(CallActivity.java:125)
at xxx.xxx.xxx..Activity.CallActivity.onCreate(CallActivity.java:119)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2312)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2421)
at android.app.ActivityThread.access$900(ActivityThread.java:154)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1324)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5329)
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:904)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)

I was using multiple version of library for chat, video and core, so i contacted Quickblox and they told me to use the same version of library for all. Hope this helps.
Thank You

ClassCastException: class can not be case to itself on android using dagger

Recently I started to observe a lot of exceptions of this kind.
The classes that can not be casted to itself are injected by dagger.
By the way, I'm using multidex build in gradle.
Log look like the following:
FATAL EXCEPTION: main
Process: com.ui.client.debug, PID: 22087
java.lang.ClassCastException: com.logic.feed.FeedManager cannot be cast
to com.logic.feed.FeedManager
at com.logic.topic.TopicHandler$$InjectAdapter.get(TopicHandler$$InjectAdapter.java:73)
at com.logic.topic.TopicHandler$$InjectAdapter.get(TopicHandler$$InjectAdapter.java:19)
at com.ui.client.module.MainActivityModule$$ModuleAdapter$ProvideTopicHandlerProvidesAdapter.get(MainActivityModule$$ModuleAdapter.java:1244)
at com.ui.client.module.MainActivityModule$$ModuleAdapter$ProvideTopicHandlerProvidesAdapter.get(MainActivityModule$$ModuleAdapter.java:1208)
at com.ui.topic.TopicScene$$InjectAdapter.injectMembers(TopicScene$$InjectAdapter.java:73)
at com.ui.topic.TopicScene$$InjectAdapter.injectMembers(TopicScene$$InjectAdapter.java:23)
at dagger.ObjectGraph$DaggerObjectGraph.inject(ObjectGraph.java:281)
at com.ui.core.base.BaseActivity.inject(BaseActivity.java:35)
at com.ui.core.base.BaseFragment.onActivityCreated(BaseFragment.java:54)
at android.app.Fragment.performActivityCreated(Fragment.java:2122)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:927)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1082)
at android.app.BackStackRecord.run(BackStackRecord.java:833)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467)
at android.app.FragmentManagerImpl$1.run(FragmentManager.java:452)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5834)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1388)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1183)

If you still haven't figured a solution, it might be Samsung's faulty implementation of MultiDex on theEuropean variant of the Galaxy S5 on 5.0:
https://stackoverflow.com/a/29008480/477243
I've had plenty of similar crashes reported (ClassCastException on casting a class to itself).
Upon reading the linked answer I've checked the devices which were generating the crash, all of them were SM G900F on Android 5.0, which is a shame since my App is available only on UK and Netherlands and the GS5 is one of our top devices (11.5% of the users).

Google Maps API Android - NullPointerException - setBoundsInParent

In our Android mobile application (compatible with Android versions 4.0 and upper), we use Google Maps API V2.
We get some bug reports from users on some kinds of devices (Android versions 4.3, 4.4 and 5.0) with a NullPointerException in setBoundsInParent method of android.view.accessibility.AccessibilityNodeInfo class.
The application crashes when the user tries to move or to zoom on the map.
The problem only appears for some users - devices. Most of our customers do not have that problem.
The problem seems to come from the use of the setPadding method of Google Maps API to position the Google logo so that it is always clearly visible on the map :
#Override
protected void onCreate(Bundle savedInstanceState)
{
...
// Initialize map
...
// Sets the padding for the map
if(mMap!=null)
{
mMap.setPadding(0, DPI.toPixels(100), 0, DPI.toPixels(100));
}
...
}
Removing the call to the setPadding method seems to resolve the problem for affected users but it is not a valid solution for us because we need to position the Google logo with this method.
We cannot reproduce this problem on our development devices, so it's difficult for us to find the real origin of this problem.
You will find the full stacktraces of the bug below.
Does someone have an idea?
Thanks a lot in advance for your answer.
Best regards.
Stacktrace on Android 4.3 - 4.4
java.lang.NullPointerException
at android.view.accessibility.AccessibilityNodeInfo.setBoundsInParent(AccessibilityNodeInfo.java:1012)
at android.support.v4.view.a.k.c(SourceFile:819)
at android.support.v4.view.a.i.b(SourceFile:1850)
at com.google.maps.api.android.lib6.c.et.a(Unknown Source)
at android.support.v4.widget.ab.a(SourceFile:56)
at android.support.v4.widget.ac.a(SourceFile:717)
at android.support.v4.view.a.x.a(SourceFile:112)
at android.support.v4.view.a.ad.createAccessibilityNodeInfo(SourceFile:42)
at android.view.AccessibilityInteractionController$AccessibilityNodePrefetcher.prefetchAccessibilityNodeInfos(AccessibilityInteractionController.java:724)
at android.view.AccessibilityInteractionController.findAccessibilityNodeInfoByAccessibilityIdUiThread(AccessibilityInteractionController.java:147)
at android.view.AccessibilityInteractionController.access$300(AccessibilityInteractionController.java:49)
at android.view.AccessibilityInteractionController$PrivateHandler.handleMessage(AccessibilityInteractionController.java:971)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5212)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
at dalvik.system.NativeStart.main(Native Method)
Stacktrace on Android 5.0
java.lang.NullPointerException: Attempt to read from field 'int android.graphics.Rect.left' on a null object reference
at android.view.accessibility.AccessibilityNodeInfo.setBoundsInParent(AccessibilityNodeInfo.java:1316)
at android.support.v4.view.a.k.c(SourceFile:819)
at android.support.v4.view.a.i.b(SourceFile:1850)
at com.google.maps.api.android.lib6.c.et.a(Unknown Source)
at android.support.v4.widget.ab.a(SourceFile:56)
at android.support.v4.widget.ac.a(SourceFile:717)
at android.support.v4.view.a.x.a(SourceFile:112)
at android.support.v4.view.a.ad.createAccessibilityNodeInfo(SourceFile:42)
at android.view.AccessibilityInteractionController$AccessibilityNodePrefetcher.prefetchAccessibilityNodeInfos(AccessibilityInteractionController.java:894)
at android.view.AccessibilityInteractionController.findAccessibilityNodeInfoByAccessibilityIdUiThread(AccessibilityInteractionController.java:155)
at android.view.AccessibilityInteractionController.access$400(AccessibilityInteractionController.java:53)
at android.view.AccessibilityInteractionController$PrivateHandler.handleMessage(AccessibilityInteractionController.java:1236)
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)

The bug has been confirmed by Google : http://code.google.com/p/gmaps-api-issues/issues/detail?id=7619
Best regards.