Android Question java.lang.AbstractMethodError

[TonyVerberne]

I get the error below when I try to install my app (see attached zip file). I have searched for a solution to no avail.
Any help would be appreciated. This app is just for my personal use at this stage.
I have attached a zip file of the complete project.


Logger connected to: OPPO CPH2145
--------- beginning of main
--------- beginning of system
Copying updated assets files (38)
** Activity (main) Create, isFirst = true **
java.lang.AbstractMethodError: abstract method "void android.support.v4.view.PagerAdapter.startUpdate(android.view.View)"
at android.support.v4.view.ViewPager.populate(ViewPager.java:399)
at android.support.v4.view.ViewPager.onAttachedToWindow(ViewPager.java:563)
at android.view.View.dispatchAttachedToWindow(View.java:20731)
at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3509)
at android.view.ViewGroup.addViewInner(ViewGroup.java:5359)
at android.view.ViewGroup.addView(ViewGroup.java:5137)
at android.view.ViewGroup.addView(ViewGroup.java:5109)
at anywheresoftware.b4a.objects.ActivityWrapper.AddView(ActivityWrapper.java:124)
at b4a.ShoppingList.main._activity_create(main.java:782)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:732)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:351)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:144)
at b4a.ShoppingList.main.afterFirstLayout(main.java:105)
at b4a.ShoppingList.main.access$000(main.java:17)
at b4a.ShoppingList.main$WaitForLayout.run(main.java:83)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:263)
at android.app.ActivityThread.main(ActivityThread.java:8258)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:612)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1006)
** Activity (main) Resume **
--------- beginning of crash
java.lang.AbstractMethodError: abstract method "void android.support.v4.view.PagerAdapter.startUpdate(android.view.View)"
at android.support.v4.view.ViewPager.populate(ViewPager.java:399)
at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:585)
at android.view.View.measure(View.java:25785)
at android.view.ViewGroup.measureChild(ViewGroup.java:7014)
at android.view.ViewGroup.measureChildren(ViewGroup.java:6991)
at anywheresoftware.b4a.BALayout.onMeasure(BALayout.java:81)
at android.view.View.measure(View.java:25785)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:7043)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at android.view.View.measure(View.java:25785)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:7043)
at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:463)
at android.view.View.measure(View.java:25785)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:7043)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at com.android.internal.policy.DecorView.onMeasure(DecorView.java:828)
at android.view.View.measure(View.java:25785)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:3779)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:2537)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2799)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:2257)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:8796)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1140)
at android.view.Choreographer.doCallbacks(Choreographer.java:962)
at android.view.Choreographer.doFrame(Choreographer.java:887)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1125)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:263)
at android.app.ActivityThread.main(ActivityThread.java:8258)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:612)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1006)

 

[Erel]

The fact that you see "android.support.v4.view" means that you are using an old SDK with an old library.

Download the latest version of B4A + SDK. Use TabStripViewPager.

 

[TonyVerberne]

The fact that you see "android.support.v4.view" means that you are using an old SDK with an old library.

Download the latest version of B4A + SDK. Use TabStripViewPager.

Thanks Erel. I will try TabStripViewPager. The example code looks very helpful.