Develop Reference

Error ClassNotFoundException when downloaded from Google Play store on some devices

I have got a problem involving ClassNotFoundException. When i "Run as
android application" from eclipse it works fine, but when i download
it from Google Play (same source code but "Exported as signed app") it
crashes with the following stacktrace:
java.lang.RuntimeException: Unable to instantiate activity
ComponentInfo{com.xxxx.xxxxxx./com.xxxx.xxxxxx..SplashActivity}:
java.lang.ClassNotFoundException: Didn't find class
"com.xxxx.xxxxxx..SplashActivity" on path: DexPathList[[zip
file
"/mnt/asec/com.xxxx.xxxxxx.-1/pkg.apk"],nativeLibraryDirectories=[/vendor/lib,
/system/lib]] at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2277)
at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2403)
at android.app.ActivityThread.access$600(ActivityThread.java:165) at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1373)
at android.os.Handler.dispatchMessage(Handler.java:107) at
android.os.Looper.loop(Looper.java:194) at
android.app.ActivityThread.main(ActivityThread.java:5391) at
java.lang.reflect.Method.invokeNative(Native Method) at
java.lang.reflect.Method.invoke(Method.java:525) at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600) at
dalvik.system.NativeStart.main(Native Method) Caused by:
java.lang.ClassNotFoundException: Didn't find class
"com.xxxx.xxxxxx..SplashActivity" on path: DexPathList[[zip
file
"/mnt/asec/com.xxxx.xxxxxx.-1/pkg.apk"],nativeLibraryDirectories=[/vendor/lib,
/system/lib]] at
dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:53)
at java.lang.ClassLoader.loadClass(ClassLoader.java:501) at
java.lang.ClassLoader.loadClass(ClassLoader.java:461) at
android.app.Instrumentation.newActivity(Instrumentation.java:1123) at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2268)
... 11 more

Try Cleaning the project and export it once more to google play.

Android Navigation Drawer with Page Sliding tab Strip

I'm trying to use Android Navigation Drawer with Page (Pager) Sliding tab Strip (https://github.com/Balaji-K13/Navigation-drawer-page-sliding-tab-strip), but i couldn't make it work. I'm using android studio. I made the imports in main project, and doesn't show any error, but when i run into a device (virtual or real) get this error:
05-22 10:38:20.200 1434-1434/com.webileapps.navdrawer E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.webileapps.navdrawer, PID: 1434
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.webileapps.navdrawer/com.webileapps.navdrawer.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.webileapps.navdrawer.MainActivity" on path: DexPathList[[zip file "/data/app/com.webileapps.navdrawer-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.webileapps.navdrawer-1, /system/lib]]
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2102)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2226)
at android.app.ActivityThread.access$700(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1397)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4998)
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:777)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.webileapps.navdrawer.MainActivity" on path: DexPathList[[zip file "/data/app/com.webileapps.navdrawer-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.webileapps.navdrawer-1, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2093)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2226)
            at android.app.ActivityThread.access$700(ActivityThread.java:135)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1397)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4998)
            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:777)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
            at dalvik.system.NativeStart.main(Native Method)
So, thoughts?

I was also trying to implement it and got the same error .After lot of effort I was able to run it but received the similar error as you have received .
I resolved the issue by
1:Close and start your eclipse .
2: copying the v4 jar of main project in all the library projects and deleting the existing ones .
The error comes due to mismatch of supportv4jar. Make all the supportv4jar of same version
3:after that Delete the gen and bin folder and clean the project and run .

Error only in exported APK: Unable to instantiate activity ComponentInfo

When I run my app directly from Android Developer Tools (ADT), it works fine. However, when I export it to an APK file and install it, I get the following error:
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{my.app/my.app.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "my.app.MainActivity" on path: DexPathList[[zip file "/data/app/my.app-2.apk"],nativeLibraryDirectories=[/data/app-lib/my.app-2, /vendor/lib, /system/lib]]
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2187)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2311)
at android.app.ActivityThread.access$600(ActivityThread.java:149)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1293)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5214)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: Didn't find class "my.app.MainActivity" on path: DexPathList[[zip file "/data/app/my.app-2.apk"],nativeLibraryDirectories=[/data/app-lib/my.app-2, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:53)
at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2178)
... 11 more

The problem seemed to be a bug in ADT. Manually doing a clean via Project -> Clean and then re-exporting the APK fixed the problem.

java.lang.ClassNotFoundException: Didn't find class after updating Android studio (Local)

I've been getting java.lang.ClassNotFoundException errors ever since I updated to 21.
My apk crashes on install every time and throws the following error:
java.lang.RuntimeException: Unable to instantiate application mypackage.class:
java.lang.ClassNotFoundException: Didn't find class "mypackage.class" on path:
at android.app.LoadedApk.makeApplication(LoadedApk.java:507)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4301)
at android.app.ActivityThread.access$1500(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
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:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
It seems people have had similar problems like this in the past and this solution has worked for them.
I'm using android studio not Eclipse so I don't what steps to reproduce.
Libraries do not get added to APK anymore after upgrade to ADT 22

ClassNotFoundException inside Google-Analytics from inside Google-Play-Services

I got a strange crash in my app and the new Analytics from inside Google-Play-Services - this bug seems to be really rare, but I really would like to know what is going on there.
java.lang.RuntimeException: Unable to instantiate receiver com.google.analytics.tracking.android.AnalyticsReceiver: java.lang.ClassNotFoundException: Didn't find class "com.google.analytics.tracking.android.AnalyticsReceiver" on path: /mnt/asec/org.ligi.passandroid-1/pkg.apk
at android.app.ActivityThread.handleReceiver(ActivityThread.java:2375)
at android.app.ActivityThread.access$1500(ActivityThread.java:145)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1322)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5095)
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:898)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:665)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.analytics.tracking.android.AnalyticsReceiver" on path: /mnt/asec/org.ligi.passandroid-1/pkg.apk
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:65)
at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
at android.app.ActivityThread.handleReceiver(ActivityThread.java:2370)
... 10 more