Bug? TabStrip java.lang.NoClassDefFoundError: Failed resolution of:

NamR

Member
Licensed User
Hi,

After upgrading to B4A Version 10.2, I encountered error in TabStrip.

Below is the error log.

java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/viewpager/widget/ViewPager$OnPageChangeListener;
at anywheresoftware.b4a.objects.TabStripViewPager.DesignerCreateView(TabStripViewPager.java:59)
at anywheresoftware.b4a.objects.CustomViewWrapper.AfterDesignerScript(CustomViewWrapper.java:70)
at anywheresoftware.b4a.keywords.LayoutBuilder.loadLayout(LayoutBuilder.java:162)
at anywheresoftware.b4a.objects.PanelWrapper.LoadLayout(PanelWrapper.java:134)
at rtm.demo.nfc.client2.ewallet._vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv6(ewallet.java:1639)
at rtm.demo.nfc.client2.ewallet._selecttran_click(ewallet.java:1769)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:213)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:197)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:193)
at anywheresoftware.b4a.objects.ViewWrapper$1.onClick(ViewWrapper.java:80)
at android.view.View.performClick(View.java:6205)
at android.view.View$PerformClick.run(View.java:23653)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6682)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)
Caused by: java.lang.ClassNotFoundException: Didn't find class "androidx.viewpager.widget.ViewPager$OnPageChangeListener" on path: DexPathList[[zip file "/data/app/rtm.demo.nfc.client2-1/base.apk"],nativeLibraryDirectories=[/data/app/rtm.demo.nfc.client2-1/lib/arm64, /system/lib64, /vendor/lib64]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)


Thank you in advance.
 

NamR

Member
Licensed User
Hi Erel,

It was working before I upgraded into Version 10.2. How can I update the Android Support Library? Do I have to reinstall everything?

I follow the installation instruction, but I still get the error.

Thank you,

This is not a bug. You are probably using the old Android Support Library SDK. Follow the installation instructions and it will work: https://www.b4x.com/b4a.html
 
Last edited:
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