App Keeps Stopping on Some Devices (when using Custom WebView)

[drdoof]

Hello, I've launched my first app in google play, (thank you MIT AI2 Devs)
My app works perfect on lots of devices but when I open it with some devices(old,cheap devices)
It keeps stopping while starting.
I am suspecting from my extensions which are;

I tested with 6-7 different phones and it crushed only 2 of them. One of them is android 7. I installed "Hello Cudi" tutorial's apk to this phone and it worked. I don't know the other phones android version but I will post here when I learn. From this extensions which one does not support lower android version devices? Any idea?

I searched my problem in forum and there was similar questions but this one is his phones problem, and this has no solving.

I did not share my aia file because it contains too many blocks to investigate and contains my special information for some sites. I can share it via direct message if needed to solve. But as I said I am suspecting from my extensions since my app works on lots of devices, my codes can not be wrong.

Lastly, I tried my app in firebase test lab > Robo test and phone was "Pixel 5e, API Level 30" and it worked fine, it gave only 1 caution which is;

Non-SDK API Usage Violation

Your app uses 1 non-SDK interfaces, which are incompatible with Android P+.

Landroid/media/AudioManager;->getOutputLatency(I)I

Addition Edit: Just do another test with firebase test and results;

and last text with virtual devices.

[drdoof]

Phone: Nexus 5, API level 23
Error:

java.lang.NoClassDefFoundError: Failed resolution of: Landroid/view/autofill/AutofillManager;
       FATAL EXCEPTION: main
Process: appinventor.ai_hasanonuratac.AnimeKing, PID: 10679
java.lang.NoClassDefFoundError: Failed resolution of: Landroid/view/autofill/AutofillManager;
	at com.sunny.CustomWebView.CustomWebView.resetWebView(Unknown Source)
	at com.sunny.CustomWebView.CustomWebView.<init>(Unknown Source)
	at java.lang.reflect.Constructor.newInstance(Native Method)
	at gnu.expr.PrimProcedure.apply(PrimProcedure.java:272)
	at gnu.mapping.CallContext.runUntilDone(CallContext.java:234)
	at gnu.mapping.CallContext.runUntilValue(CallContext.java:298)
	at gnu.kawa.reflect.Invoke.applyN(Invoke.java:209)
	at gnu.mapping.ProcedureN.apply2(ProcedureN.java:39)
	at appinventor.ai_hasanonuratac.AnimeKing.Screen1.$define(Screen1.yail:10257)
	at com.google.appinventor.components.runtime.Form.onCreateFinish(Form.java:395)
	at com.google.appinventor.components.runtime.Form.onCreate(Form.java:340)
	at appinventor.ai_hasanonuratac.AnimeKing.Screen1.onCreate(Screen1.yail:10003)
	at android.app.Activity.performCreate(Activity.java:6251)
	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
	at android.app.ActivityThread.-wrap11(ActivityThread.java)
	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
	at android.os.Handler.dispatchMessage(Handler.java:102)
	at android.os.Looper.loop(Looper.java:148)
	at android.app.ActivityThread.main(ActivityThread.java:5417)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.ClassNotFoundException: Didn't find class "android.view.autofill.AutofillManager" on path: DexPathList[[zip file "/data/app/appinventor.ai_hasanonuratac.AnimeKing-1/base.apk"],nativeLibraryDirectories=[/data/app/appinventor.ai_hasanonuratac.AnimeKing-1/lib/arm, /vendor/lib, /system/lib]]
	at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
	... 24 more
	Suppressed: java.lang.ClassNotFoundException: android.view.autofill.AutofillManager
		at java.lang.Class.classForName(Native Method)
		at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
		at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
		at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
		... 25 more
	Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available

[Gordon_Lu]

Seems that your project is not working on older phones. Check the extensions used once again. Some extensions do not work on older Android devices like Android 5.

[drdoof]

this is exactly what I am saying
How can I find which extension works in which android version and sdk version?

[Gordon_Lu]

Review the documentations of these extensions once again. Find their minimum supported APIs. Or, if the documentations didn't include a section for minimum APIs, see the Tests sections for tests that have been conducted with which extensions.

[TIMAI2]

Or backtrack through your app, remove one extension at a time and test to see if it crashes.

[dora_paz]

Also make sure that you are using latest versions of the extensions

[drdoof]

I think the reason is customwebview extension. I created a new app which only contains customwebview and it crushs on old phones. I will download lastest version and going to try again. I'll inform here the results.

[dora_paz]

For latest version 11 required Api is 21 see GitHub - vknow360/CustomWebView: An extended form of WebViewer with more customization and flexibility (For MIT AI2 and its distros)

[drdoof]

Yes I downloaded aix from here and I am going to try it as soon as possible.
Interesting part is in my app the version I used is 11 which is last version according to creator.
Anyway we'll see the results soon

[drdoof]

@drdoof

Yes I downloaded aix from here and I am going to try it as soon as possible.

Did not work. Created an issue on github page.

[vknow360]

It is a known issue.
Please use v 12.0beta.

[drdoof]

@vknow360

Please use v 12.0beta.

Thank you I tried and it works, for other's here is beta link.