Develop Reference

Unable to resolve superclass of FragmentActivity

I had my environment setup on a previous machine, and I'm on a differnt MacBook. For some strange reason, I keep getting an issue with one of my classes which exend FragmentActivity. It keeps saying it can't find the FragmentActivity class, although I have the support jar in my class path, as per the image:
The detailed error message that I'm seeing is here:
10-23 23:10:16.300 26062-26062/com.testapp W/dalvikvm﹕ Unable to resolve superclass of Lcom/testapp/views/loginregistration/LoginView; (92)
10-23 23:10:16.300 26062-26062/com.testapp W/dalvikvm﹕ Link of class 'Lcom/testapp/views/loginregistration/LoginView;' failed
10-23 23:10:16.300 26062-26062/com.testapp D/AndroidRuntime﹕ Shutting down VM
10-23 23:10:16.300 26062-26062/com.testapp W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x414f8700)
10-23 23:10:16.330 26062-26062/com.testapp E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.testapp/com.testapp.views.loginregistration.LoginView}: java.lang.ClassNotFoundException: Didn't find class "com.testapp.views.loginregistration.LoginView" on path: DexPathList[[zip file "/system/framework/com.google.android.maps.jar", zip file "/data/app/com.testapp-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.testapp-1, /vendor/lib, /system/lib]]
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2137)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
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:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.testapp.views.loginregistration.LoginView" on path: DexPathList[[zip file "/system/framework/com.google.android.maps.jar", zip file "/data/app/com.testapp-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.testapp-1, /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:2128)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
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:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Is there someting else i'm missing?

In your IDE (as shown in your screenshot), check the 'export' box next to the classpath entry that contains the missing class.
I had a similar problem with a class from the Android Support library (Unable to resolve superclass of Lcom ... PagerAdapter). It turned out a library referenced in the .classpath needed to be exported:
From:
<classpathentry
To:
<classpathentry exported="true" ...
For Eclipse users, I fixed the problem by exporting Android Private Libraries in the Java Build Path menu.

Project compiles successfully, but I get exception about missing drawable

I had my project running in Eclipse, I tried converting it to Android Studio. However, I also downloaded (via github) the latest HoloEverywhere library, and updated contrib/ with ActionBarSherlock library ( I use them both ).
Everything compiles successfully, but when starting the first activity, I get the following exceptions:
06-18 10:57:22.611 2190-2190/com.wasp.androidbg E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.wasp.androidbg/com.wasp.androidbg.StartScreen}: android.content.res.Resources$NotFoundException: File res/drawable/list_selector_holo_light.xml from drawable resource ID #0x7f02013f
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5039)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.content.res.Resources$NotFoundException: File res/drawable/list_selector_holo_light.xml from drawable resource ID #0x7f02013f
at org.holoeverywhere.drawable.DrawableCompat.loadDrawable(DrawableCompat.java:138)
at org.holoeverywhere.drawable.DrawableCompat.getDrawable(DrawableCompat.java:107)
at org.holoeverywhere.widget.ListView.setSelector(ListView.java:964)
at com.wasp.androidbg.StartScreen.onCreate(StartScreen.java:76)
at android.app.Activity.performCreate(Activity.java:5104)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
... 11 more
Caused by: android.content.res.Resources$NotFoundException: Resource is not a Drawable (color or path): TypedValue{t=0x1c/d=0x0 a=2 r=0x7f090011}
at org.holoeverywhere.drawable.DrawableCompat.loadDrawable(DrawableCompat.java:128)
at org.holoeverywhere.drawable.DrawableCompat.getDrawable(DrawableCompat.java:107)
at org.holoeverywhere.drawable.StateListDrawable.inflate(StateListDrawable.java:194)
at org.holoeverywhere.drawable.DrawableCompat.createFromXmlInner(DrawableCompat.java:87)
at org.holoeverywhere.drawable.DrawableCompat.createFromXml(DrawableCompat.java:63)
at org.holoeverywhere.drawable.DrawableCompat.loadDrawable(DrawableCompat.java:135)
... 17 more
06-18 11:04:20.118 2257-2257/com.wasp.androidbg D/dalvikvm: Not late-enabling CheckJNI (already on)
06-18 11:04:20.347 2257-2257/com.wasp.androidbg E/Trace: error opening trace file: No such file or directory (2)
I don't have any custom themes (yet). I double checked the .apk file, and the file exists, but is named abs__list_selector_holo_light.xml - it does have prefix abs__.
I searched but there are no configurations in HoloEverywhere, which use this prefix, or any way to configure it.
Any help appreciated!

VFY: unable to find class referenced in signature

I have a simple android application which uses a modbus library ("jamod") on its build path. It crashes immediately as i run it. I have basically the same problem in this question: Getting "Caused by: java.lang.VerifyError:"
But i cannot really fix the problem. My application was working fine before, now no matter what i do it doesn't seem to work.
Below is logcat output. Thanks in advance.
08-09 14:36:47.753: W/dalvikvm(396): VFY: unable to find class referenced in signature (Lnet/wimpi/modbus/net/TCPMasterConnection;)
08-09 14:36:47.823: W/dalvikvm(396): VFY: unable to resolve exception class 510 (Lnet/wimpi/modbus/ModbusIOException;)
08-09 14:36:47.823: W/dalvikvm(396): VFY: unable to find exception handler at addr 0x18
08-09 14:36:47.854: W/dalvikvm(396): VFY: rejected Lcom/example/xmlparsertest/JavaModBusTcpDriver;.<init> (Ljava/lang/String;I)V
08-09 14:36:47.854: W/dalvikvm(396): VFY: rejecting opcode 0x0d at 0x0018
08-09 14:36:47.854: W/dalvikvm(396): VFY: rejected Lcom/example/xmlparsertest/JavaModBusTcpDriver;.<init> (Ljava/lang/String;I)V
08-09 14:36:47.854: W/dalvikvm(396): Verifier rejected class Lcom/example/xmlparsertest/JavaModBusTcpDriver;
08-09 14:36:47.854: D/AndroidRuntime(396): Shutting down VM
08-09 14:36:47.854: W/dalvikvm(396): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
08-09 14:36:47.873: E/AndroidRuntime(396): FATAL EXCEPTION: main
08-09 14:36:47.873: E/AndroidRuntime(396): java.lang.VerifyError: com.example.xmlparsertest.JavaModBusTcpDriver
08-09 14:36:47.873: E/AndroidRuntime(396): at com.example.xmlparsertest.MainActivity.<init>(MainActivity.java:13)
08-09 14:36:47.873: E/AndroidRuntime(396): at java.lang.Class.newInstanceImpl(Native Method)
08-09 14:36:47.873: E/AndroidRuntime(396): at java.lang.Class.newInstance(Class.java:1429)
08-09 14:36:47.873: E/AndroidRuntime(396): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
08-09 14:36:47.873: E/AndroidRuntime(396): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577)
08-09 14:36:47.873: E/AndroidRuntime(396): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
08-09 14:36:47.873: E/AndroidRuntime(396): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
08-09 14:36:47.873: E/AndroidRuntime(396): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
08-09 14:36:47.873: E/AndroidRuntime(396): at android.os.Handler.dispatchMessage(Handler.java:99)
08-09 14:36:47.873: E/AndroidRuntime(396): at android.os.Looper.loop(Looper.java:123)
08-09 14:36:47.873: E/AndroidRuntime(396): at android.app.ActivityThread.main(ActivityThread.java:4627)
08-09 14:36:47.873: E/AndroidRuntime(396): at java.lang.reflect.Method.invokeNative(Native Method)
08-09 14:36:47.873: E/AndroidRuntime(396): at java.lang.reflect.Method.invoke(Method.java:521)
08-09 14:36:47.873: E/AndroidRuntime(396): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-09 14:36:47.873: E/AndroidRuntime(396): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-09 14:36:47.873: E/AndroidRuntime(396): at dalvik.system.NativeStart.main(Native Method)

One thing to double check you are doing is that the checkbox is ticked for the jar files in the "Order and Export" tab in the Build path window. That will include the library in the built APK.

Did you put the jamod jar file in the "libs" directory in Eclipse? If not it won't be bundled into your application even if it is on the path during compilation. This is a fairly new change.

I had a similar VFY, link and class def not found errors even though all of my libraries were in "LIB" folder and had added them in build path as well and ECLIPSE could find them easily in compile time, but when they were deployed on a real device, it gave problems.
Solution: Make sure your library files are placed in "libs" folder and not in "lib" or "library" in the ECLIPSE project.

This error (java.lang.VerifyError) comes when there are incompatible resources like interfaces/class/libs files, improper inheritances/encapsulation of static/instance level identifiers as variables/methods/arguments/class/files.
This issue is coming by simply violation of OOP design principles in the code. So the code rejected by verification process of jvm and throws verification error on runtime. If you closely look at the Error stacktrace, Instance of class-A(com.example.xmlparsertest.MainActivity) is being created by jvm stack [java.lang.Class.newInstanceImpl(Native Method)... java.lang.Class.newInstance...]. This class is referring or being reffered by other classes with violation of design principles which is causing the class to fail to get instantiated.
08-09 14:36:47.854: W/dalvikvm(396): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
08-09 14:36:47.873: E/AndroidRuntime(396): FATAL EXCEPTION: main
08-09 14:36:47.873: E/AndroidRuntime(396): java.lang.VerifyError: com.example.xmlparsertest.JavaModBusTcpDriver
08-09 14:36:47.873: E/AndroidRuntime(396): at com.example.xmlparsertest.MainActivity.<init>(MainActivity.java:13)
08-09 14:36:47.873: E/AndroidRuntime(396): at java.lang.Class.newInstanceImpl(Native Method)
08-09 14:36:47.873: E/AndroidRuntime(396): at java.lang.Class.newInstance(Class.java:1429)
08-09 14:36:47.873: E/AndroidRuntime(396): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
08-09 14:36:47.873: E/AndroidRuntime(396): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577)
08-09 14:36:47.873: E/AndroidRuntime(396): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
08-09 14:36:47.873: E/AndroidRuntime(396): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
08-09 14:36:47.873: E/AndroidRuntime(396): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
08-09 14:36:47.873: E/AndroidRuntime(396): at android.os.Handler.dispatchMessage(Handler.java:99)
08-09 14:36:47.873: E/AndroidRuntime(396): at android.os.Looper.loop(Looper.java:123)
08-09 14:36:47.873: E/AndroidRuntime(396): at android.app.ActivityThread.main(ActivityThread.java:4627)
08-09 14:36:47.873: E/AndroidRuntime(396): at java.lang.reflect.Method.invokeNative(Native Method)
08-09 14:36:47.873: E/AndroidRuntime(396): at java.lang.reflect.Method.invoke(Method.java:521)
08-09 14:36:47.873: E/AndroidRuntime(396): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-09 14:36:47.873: E/AndroidRuntime(396): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-09 14:36:47.873: E/AndroidRuntime(396): at dalvik.system.NativeStart.main(Native Method)
These warnings cannot be ignored because these warnings are causing the FATAL EXCEPTIONS. Dalvikvm Engineers have implemented the OOP principles as Sun Engineers Done. There are various blogs/forum where people says to ignore these warning. So do not ignore these warning and correct them especially for medical/banking/security field applications or that warning is causing to break the Application.
Do recheck your implemented OOP design principles (e.g. inheritances/encapsulation/polymorphism etc.) in the code. I was being asked to check and eliminate such errors on a big multi-module android application and i found many design violations.
First trigger to solve such issues make public/non-final everything related to class which is getting into FATAL ERROR. Once you solved, then implement your design principles one-by-one and you will get an error free appplication.
Thanks,
Vinod Bherwal (Android Architect).

How to resolve java.lang.ClassNotFoundException in ActivityThread.performLaunchActivity?

For my Android application, I get the following error in Google Play's developer console:
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{PACKAGE_NAME/PACKAGE_NAME.MainActivity}: java.lang.ClassNotFoundException: PACKAGE_NAME.MainActivity in loader dalvik.system.PathClassLoader[/mnt/asec/PACKAGE_NAME-1/pkg.apk]
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1573)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
at android.app.ActivityThread.access$1500(ActivityThread.java:117)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3693)
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:907)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:665)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: PACKAGE_NAME.MainActivity in loader dalvik.system.PathClassLoader[/mnt/asec/PACKAGE_NAME-1/pkg.apk]
at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1565)
Although this error appears extremely rarely (and can probably be neglected), I find it cleaner to have a error-free developer console :) And furthermore, I would just like to know the causes for this error.
Yes, it seems as if there was a class that could not be found. But why? How can I prevent this?

Update(4/26/15):
After further research I believe you are right in the fact that its definitely a user error. The [/mnt/asec/PACKAGE_NAME-1/pkg.apk] most likely means they are trying to move your app to the SD card. Please read here:
Android intermittent class not found run time exception
"Unable to instantiate activity" error
Android: Unable to instantiate activity / ClassNotFoundException
Original:
This is a Java RuntimeException as seen by Logcat. I've seen this happen many times before when I have not added the Activity to manifest correctly.
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{PACKAGE_NAME/PACKAGE_NAME.MainActivity}: java.lang.ClassNotFoundException: PACKAGE_NAME.MainActivity in loader dalvik.system.PathClassLoader[/mnt/asec/PACKAGE_NAME-1/pkg.apk]

MonoDevelop default M4A application "has stopped unexpectedly"

When I try running the default "Mono for Android Application", I get an error that the application has stopped unexpectedly.
After, (sometimes) I would get an exception in MonoDevelop: System.IO.IOException: DWP Handshake failed.
I'm not sure what could be wrong - I haven't made any changes to the application. Any help would be greatly appreciated - I've been trying to get this running all day.
TIA
Stacktrace:
D/AndroidRuntime( 2066): Shutting down VM
E/AndroidRuntime( 2066): FATAL EXCEPTION: main
E/AndroidRuntime( 2066): java.lang.UnsatisfiedLinkError: Couldn't load monodroid: findLibrary returned null
E/AndroidRuntime( 2066): at java.lang.Runtime.loadLibrary(Runtime.java:429)
E/AndroidRuntime( 2066): at java.lang.System.loadLibrary(System.java:554)
E/AndroidRuntime( 2066): at mono.MonoPackageManager.LoadApplication(MonoPackageManager.java:24)
E/AndroidRuntime( 2066): at mono.MonoRuntimeProvider.attachInfo(MonoRuntimeProvider.java:25)
E/AndroidRuntime( 2066): at android.app.ActivityThread.installProvider(ActivityThread.java:3554)
E/AndroidRuntime( 2066): at android.app.ActivityThread.installContentProviders(ActivityThread.java:3309)
E/AndroidRuntime( 2066): at android.app.ActivityThread.handleBindApplication(ActivityThread.java:3265)
E/AndroidRuntime( 2066): at android.app.ActivityThread.access$2200(ActivityThread.java:117)
E/AndroidRuntime( 2066): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:969)
E/AndroidRuntime( 2066): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 2066): at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime( 2066): at android.app.ActivityThread.main(ActivityThread.java:3683)
E/AndroidRuntime( 2066): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 2066): at java.lang.reflect.Method.invoke(Method.java:507)
E/AndroidRuntime( 2066): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
E/AndroidRuntime( 2066): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
E/AndroidRuntime( 2066): at dalvik.system.NativeStart.main(Native Method)
I/Process ( 2066): Sending signal. PID: 2066 SIG: 9

I had a similar problem not long after going with the paid version. Simply clean and rebuild to update the references to the new monodroid library.
See also: http://www.mail-archive.com/monodroid#lists.ximian.com/msg00531.html

This is very probably Android bug 21670: sometimes native libraries are not extracted from the .apk, but the installation is still reported as successful:
W/NativeHelper( 98): Failed to cache package shared libs
W/NativeHelper( 98): java.io.IOException: Couldn't create cached binary /data/data/Mono.Android.DebugRuntime/lib/libmonosgen-2.0.so in /data/data/Mono.Android.DebugRuntime/lib
W/NativeHelper( 98): at com.android.internal.content.NativeLibraryHelper.copyNativeBinaryLI(NativeLibraryHelper.java:289)
Check your Android Debug Logs for a message similar to the above to confirm that this is the case.
If you see the above, you need to uninstall your app and as many other packages as possible to free up storage space, then reinstall your app.