Develop Reference

Android NullPointerException in $Proxy0.equals

I've recently published a couple android games based in libgdx, both of them have reported an error I have no idea where to begin with debugging. This is the stacktrace.-
java.lang.NullPointerException: null result when primitive expected
at $Proxy0.equals(Native Method)
at com.google.android.gms.internal.dw$g.equals(Unknown Source)
at java.util.ArrayList.contains(ArrayList.java:342)
at com.google.android.gms.internal.dx.a(Unknown Source)
at com.google.android.gms.internal.dw$h.b(Unknown Source)
at com.google.android.gms.internal.dw$h.b(Unknown Source)
at com.google.android.gms.internal.dw$b.bR(Unknown Source)
at com.google.android.gms.internal.dw$a.handleMessage(Unknown Source)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3687)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
at dalvik.system.NativeStart.main(Native Method)
I know the problem is something related with Google Play Game Services, but can't figure out what can be causing it. In both cases, the android version seems to be 2.3.3. Anyone who faced the same issue?

Try going on properties on your android project , and under the android tag check to see if your google library is there . If it is there try removing it and add it again .
This is how i solved this problem and worked for me . (i still get this error sometimes when i start the eclipse ). Good luck !

What could be causing a ClassNotFoundException?

So I've been working on an app lately which runs fine on most devices. However, sometimes the app crashes at start up with the following error:
java.lang.RuntimeException: Unable to instantiate activity
ComponentInfo{com.mypackage.app/com.mypackage.app.activities.MainPager}:
java.lang.ClassNotFoundException: com.mypackage.app.activities.MainPager
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1995)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2096)
at android.app.ActivityThread.access$600(ActivityThread.java:138)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1207)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:213)
at android.app.ActivityThread.main(ActivityThread.java:4787)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:809)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:576)
at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:115)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException:
com.mypackage.app.activities.MainPager
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
at android.app.Instrumentation.newActivity(Instrumentation.java:1053)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1986)
... 12 more
I get that this is because it can't find the class called MainPager. But how is that even possible? I mean, the class should be there.. I put it there myself :) . Why on earth is it not finding it?
EDIT: I think the cause may be that in my manifest I have android:package="com.mypackage.app" defined, but that my launch activity is in the package com.mypackage.app.activities. Currently testing this theory. Still weird that it only happens on some devices, though.
This solution won't work, since I then can't update the APK in Google Play (has to be the same package name in the manifest).

Since ADT update to revision 22 (May 2013) you have to check "Android Private Libraries" check box in Project -> Properties -> Java Build Path -> Order and Export in Eclipse for your older projects to get rid of this exception ...

in the manifest you add Activity name like this
android:name=".activities.MainPager"
because you have given package name
android:package="com.mypackage.app"

Now I am using ART runtime on Nexus 5, and I am getting ClassNotFound for some apps.
You can safely ignore those if that's the case for your users.

Classnotfound exception for working app

I have a strange issue.I developed an android application with scan functionality.I reused some zxing code code for the scanning section. My app is working fine for all the device and emulater too.But after I uploaded it in market I am getting error on scan portion.My error report is
java.lang.IllegalStateException: Could not execute method of the activity
at android.view.View$1.onClick(View.java:2191)
at android.view.View.performClick(View.java:2532)
at android.view.View$PerformClick.run(View.java:9291)
at android.os.Handler.handleCallback(Handler.java:587)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:150)
at android.app.ActivityThread.main(ActivityThread.java:4293)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:607)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at android.view.View$1.onClick(View.java:2186)
... 11 more
Caused by: java.lang.ExceptionInInitializerError
at com.imotiva.Menu1.points(Menu1.java:46)
... 14 more
Caused by: java.lang.NoClassDefFoundError: com.qr.decoding.ResultMetadataType
at com.qr.scanning.CaptureActivity.<clinit>(CaptureActivity.java:92)
... 15 more
Still my code code is working in device but the same app in the market don't. Please help me friends...

At last I found the solution for my problem.gtumca-MAC's solution Android update 17 seems incompatible with external Jars worked for me.Created one folder named libs and add my core.jar .Now it's working fine.Thanks all.

Why would I receive a webkit.WebView error when I do not use WebView?

I received this error twice in the last three days on different devices. I do not use WebView at all in my app so I am a bit confused.
The only thing I can think of is AdMob but wouldn't that show up in the stack trace?
Here is the stack trace:
java.lang.NullPointerException at
android.webkit.WebView.stopLoading(WebView.java:1842) at
c$a.run(Unknown Source) at
android.os.Handler.handleCallback(Handler.java:587) at
android.os.Handler.dispatchMessage(Handler.java:92) at
android.os.Looper.loop(Looper.java:143) at
android.app.ActivityThread.main(ActivityThread.java:4914) at
java.lang.reflect.Method.invokeNative(Native Method) at
java.lang.reflect.Method.invoke(Method.java:521) at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) at
dalvik.system.NativeStart.main(Native Method)
Update: In addition to the link Arhimed provided here is a link where an AdMob rep is discussing this as well
https://groups.google.com/forum/#!topic/google-admob-ads-sdk/H3lkDEmburw

From what you said I am pretty sure this is an AdMob issue. The reason you don't see any "AdMob" occurrencies in the log is that AdMob comes as an obfuscated library jar. So c$a.run(Unknown Source) is a log enrty produced by an obfuscated code.
UPDATE:
This IS really related to AdMob. There is a related SO question: Android uncatchable NullPointerException

Android force-close on Google maps: java.lang.NoSuchFieldException: loading_tile_android

One of my Android users is getting a force-close when launching Google Map (MapActivity class) inside my application. He gets a MissingResourceException. He's the only one complaining so far, and he is using Vanilla Tazz phone. The Google maps application itself works well on his device. It looks like it's something specific to Vanilla Tazz. I tried to find a fix online but have not been successful. Here's the Android error log:
java.lang.ExceptionInInitializerError
at ...
at android.view.View.performClick(View.java:2449)
at android.view.View$PerformClick.run(View.java:9027)
at android.os.Handler.handleCallback(Handler.java:587)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4627)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ExceptionInInitializerError
at com.google.android.maps.MapActivity.<clinit>(MapActivity.java:295)
... 14 more
Caused by: java.util.MissingResourceException: Could not find required resource
com.android.internal.R$drawable.loading_tile_android (java.lang.NoSuchFieldException: loading_tile_android)
at com.google.android.maps.InternalR.getField(InternalR.java:65)
at com.google.android.maps.InternalR.get(InternalR.java:39)
at com.google.android.maps.InternalR.access$000(InternalR.java:28)
at com.google.android.maps.InternalR$drawable.get(InternalR.java:112)
at com.google.android.maps.InternalR$drawable.<clinit>(InternalR.java:119)
... 15 more
I would appreciate if anyone can suggest anything to fix this.

Not sure you'll find a fix for this: it sounds like the ROM was built without that resource as part of the OS image. They'll probably need a new ROM to get around that.