Develop Reference

Issues running obfuscated DEX modules - AbstractMethodError

I'm developing an Android application based on a main APK installed on the mobile device, and some android modules that are compiled to a .dex file. These files are loaded at runtime by the main application and the classes inside the .dex files are instantiated via Dynamic Dex Loading.
I'm facing some issues related to proguard, as even if I use the #Keep annotation on exposed methods in the modules and the main APK and I tell to proguard to keep interfaces methods, when I call one of the methods implemented in a module i get:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.android.myproject, PID: 13893
java.lang.AbstractMethodError: abstract method "z.a com.android.myproject.MyClass.mymethod()"
at com.android.myproject.MainService.H(:784)
at com.android.myproject.MainService.M(:258)
at com.android.myproject.MainService.a0(:198)
at com.android.myproject.MainService.U(:148)
at com.android.myproject.MainService.C(:133)
at com.android.myproject.MainService.onServiceConnected(:90)...
If i try to debug, and i place a breakpoint right on the method call, using the "Evaluate Expression" tool in Android Studio I'm able to call the method with success, but if I let it execute on its own it crashes with the previous exception.
Can someone help me please? Thank you very much

Cannot use Data Binding in other package(library/sdk) except enabling dataBinding in main app gradle module

Well, I'm working on a library/SDK that has activities/fragments and I want to use data binding instead of the findViewById() method.
But i got this error message when I enabled dataBinding-> enabled = true in library gradle module but not enabled in the app:gradle module.
This is the error I got:
Failed resolution of: Landroidx/databinding/DataBinderMapperImpl;
Didn't find class "androidx.databinding.DataBinderMapperImpl" on path: DexPathList[[zip file "/data/app/io.raychat.raychat_sdk-eNdusNjUCa3sHWzKRK-iqw==/base.apk"],nativeLibraryDirectories=[/data/app/io.raychat.raychat_sdk-eNdusNjUCa3sHWzKRK-iqw==/lib/x86, /system/lib, /system/vendor/lib]]
The user of this library is different and I can't tell all of them to enable data binding in app:gradle module. what should I do?

As of Data Binding Library - Get Started
You must configure data binding for app modules that depend on libraries that use data binding, even if the app module doesn't directly use data binding.
So when you develop a library and you can not force your library clients to enable data binding, you simply should not use it.
Have you considered using View Binding instead?

Failed to find code-generated model provider - AWS Amplify

I'm getting the below error:
Failed to find a code-generated model provider.
AWS amplify code which throwing this error:
Amplify.addPlugin(new AWSApiPlugin());
Amplify.addPlugin(new AWSDataStorePlugin());
Amplify.configure(context);
I am following the below tutorials:
https://docs.amplify.aws/start/getting-started/generate-model/q/integration/android
https://docs.amplify.aws/cli/graphql-transformer/overview
I have tried generating models and models get generated successfully but still while running the app I am getting above exception.

When you generate models, you should expect to find various code-generated files in your application project. One of them will be app/src/main/java/com/amplifyframework/datastore/generated/model/AmplifyModelProvider.java.
When you build your app, Android Studio will compile that java file into a class file, and include it into your binary.
At runtime, on the phone, the AWSDataStorePlugin() constructor will attempt to find that same AmplifyModelProvider by means of reflection.
I would verify that:
You do actually have the code-generated AmplifyModelProvider;
It is being built successfully;
It is not being stripped out by ProGuard/R8 minification.
If you're still not able to get it working, just use the one-argument version of the AWSDataStorePlugin(...) constructor, instead. That version allows you to explicitly specify the model provider, and does not use runtime reflection.
Amplify.addPlugin(AWSDataStorePlugin(AmplifyModelProvider.getInstance()))

Your datasource needs to be updated:
Try running modelGen, then amplifyPush tasks:
Category
Resource name
Operation
Provider plugin
Api
amplifyDatasource
Update
awscloudformation

Error binding JNA to Xamarin.Android Binding library

I am trying to bind JNA-3.0.9 jar to binding library as EmbeddedReferenceJar as it is required by one of the other JARs i am using.
I am facing the error binding a jna-3.0.9 jar file. The error message is :
Error CS0121 The call is ambiguous between the following methods or properties: 'IFromNativeConverter.NativeType()' and 'IToNativeConverter.NativeType()' EDCBinding1 ****\obj\Debug\generated\src\Com.Sun.Jna.ITypeConverter.cs 108 Active
Is it really required to bind JNA jar seperately? or is it already part of Microsoft OpenJDK?
Any help is much appreciated.

Android NoClassDefFound when referencing class from external libraries (IntelliJ IDEA 12)

I'm having an issue with IntelliJ's dependency handling in regards to external modules. Here's some context:
I'm writing an Android app which implements Google Maps. For my current feature set, I require two external libraries-- Google's Play Services Library and mapex (A third party google map extension library located here https://code.google.com/p/mapex/). I actually built most of this project in Android Studio before I was recommended to move to IntelliJ due to the easier dependency handling. But now I'm here and still having problems.
My Error
When trying to build an object from a class located in the mapex package (com.androidnatic.maps), I get this error when starting the activity the view is contained in (object has not been created yet):
07-03 11:40:35.837: ERROR/dalvikvm(3585): Could not find class 'com.androidnatic.maps.SimpleMapView', referenced from method com.example.myproject.MapActivity.showHeatMap
And then, upon creation, my app force closes and leaves this behind in logcat:
7-03 11:40:45.467: ERROR/AndroidRuntime(3585): FATAL EXCEPTION: main
java.lang.NoClassDefFoundError: com.androidnatic.maps.SimpleMapView
at com.example.myproject.MapActivity.showHeatMap(MapActivity.java:492)
Yet I'm completely stumped because my IDE gives me no sign that anything is wrong! Classes are auto-filled in when trying to access them from MyProject.
ide-fill-in http://www.tonyandrys.com/img/fillin.jpg
No build errors about missing classes, missing modules, class definitions, or anything related.
I get the same results if I try to access the class via its full package name as well.
// No dice.
final SimpleMapView mapView = new SimpleMapView(this, "apikey");
final com.androidnatic.maps.SimpleMapView mapView = new com.androidnatic.maps.SimpleMapView(this, "apikey");
It seems that there's only an issue when the application is running on my phone, as far as my IDE is concerned.
Here's the structure of MyProject:
main-project-structure http://www.tonyandrys.com/img/mainstructure.jpg
Here's my main project's dependency settings (where I assume I screwed up somewhere):
project-structure http://www.tonyandrys.com/img/projectstructure.jpg
And here is the structure of the mapex library module:
mapex-lib http://www.tonyandrys.com/img/mapexstructure.jpg
The class files that I'm trying to access live in MapExLib/gen and MapExLib/src, which are currently marked as source directories (blue).
Does anyone have any ideas on how to proceed from here?

Try to do this :
Android, IntelliJ Idea, changing module type
I had the same error "Could not find class XXX from referenced method XXX" with Intellij, involving an Android Test Module and a test which could not find the Activity class anywhere.
I set inside the Project Structure the main Module's Facet Android to Library Module (checkbox) and it worked...
Let us know