Call Blocker not working on Marshmallow and Below. NoClassDefFoundError for CallScreeningService about applocker HOT 1 CLOSED

OK, I myself came up with a little modification to code. This might not be the right way but it does the job for me.

The Reason the No Class Def Found error occurs is because the CallScreeningService was introduced in Android N and hence the version below gets the runtime exception @https://developer.android.com/reference/kotlin/android/telecom/CallScreeningService

for Solution to this you have to create 2 different AppComponent's and ServiceBuilderModule's

• This ServiceBuilderModule1 module is for Android N and above which has both abstract funtions i.e applockerService() & callBlockerService()

ServiceBuilderModule1

@Module
abstract class ServiceBuilderModule1 {

    @ContributesAndroidInjector
    abstract fun appLockerService(): AppLockerService

    @ContributesAndroidInjector
    abstract fun callBlockerService(): CallBlockerScreeningService

}

• Now we have to create a second Module ServiceBuilderModule2 that will hold only appLocker() method. and this will be used when the API level < Android N. As CallScreeningService was introduced in AndroidN so we cannot use it below N.

ServiceBuilderModule2

@Module
abstract class ServiceBuilderModule2 {

    @ContributesAndroidInjector
    abstract fun appLockerService(): AppLockerService

}

• Now create a copy of AppComponent. The only difference will be the replacement of ServiceBuilderModule1 & 2.

AppComponent

@Singleton
@Component(
    modules = [
        AndroidSupportInjectionModule::class,
        ActivityBuilderModule::class,
        ServiceBuilderModule1::class, <--- Replace ServiceBuilderModule2 in other i.e AppComponent2
        BroadcastReceiverBuilderModule::class,
        AppModule::class,
        DatabaseModule::class]
)
interface AppComponent2 : AndroidInjector<AppLockerApplication> {

    @Component.Builder
    abstract class Builder : AndroidInjector.Builder<AppLockerApplication>()

}

• Now for the final touch Change the Override method androidInjector() in AppLockerApplication class like below.

override fun applicationInjector(): AndroidInjector<out DaggerApplication> {

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
            return DaggerAppComponent.builder().create(this)
        return DaggerAppComponent2.builder().create(this)
    }

I hope this helps someone in someway and if i am wrong at this kindly do suggest a valid solution to this problem. for me i have tested this on Android 5.0 till Android 9 and it works just fine with this solution so i thought i should share it here

from applocker.