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android10 / Android-CleanArchitecture-Kotlin

This is a movies sample app in Kotlin, which is part of a serie of blog posts I have written about architecting android application using different approaches.
https://fernandocejas.com/2018/05/07/architecting-android-reloaded/
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IllegalStateException when no connectivity #16

Closed chronvas closed 6 years ago

chronvas commented 6 years ago

"Unsafe" cast operator should be nullable Extension networkInfo on context should return NetworkInfo?, otherwise causes runtime crash.

This derrives from the abstract getSystemService which is annotated as Nullable

Also, as per Kotlin documentation about "Unsafe" cast operator (can be found here) In order to match Java cast semantics we have to have nullable type at cast right hand side

Ways to reproduce, just launch the app with no network connectivity and it crashes with logcat:

    Process: com.fernandocejas.sample, PID: 6453
    java.lang.IllegalStateException: (this.getSystemService(C…anager).activeNetworkInfo must not be null
        at com.fernandocejas.sample.core.extension.ContextKt.getNetworkInfo(Context.kt:23)
        at com.fernandocejas.sample.core.platform.NetworkHandler.isConnected(NetworkHandler.kt:29)
        at com.fernandocejas.sample.features.movies.MoviesRepository$Network.movies(MoviesRepository.kt:37)
        at com.fernandocejas.sample.features.movies.GetMovies.run(GetMovies.kt:25)
        at com.fernandocejas.sample.features.movies.GetMovies.run(GetMovies.kt:22)
        at com.fernandocejas.sample.core.interactor.UseCase$execute$job$1.doResume(UseCase.kt:38)
        at kotlin.coroutines.experimental.jvm.internal.CoroutineImpl.resume(CoroutineImpl.kt:54)
        at kotlinx.coroutines.experimental.DispatchedTask$DefaultImpls.run(Dispatched.kt:161)
        at kotlinx.coroutines.experimental.DispatchedContinuation.run(Dispatched.kt:25)
        at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1412)
        at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:285)
        at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1152)
        at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1990)
        at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1938)
        at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

Device used: Android Emulator API 26

Solution 1: networkInfo extension should return a nullable type for method named networkInfo, Usages of networkHandler.isConnected should handle null case

Solution 2: Wrap it as an Optional

chronvas commented 6 years ago

I created a pr for fixing this with Solution 1 https://github.com/android10/Android-CleanArchitecture-Kotlin/pull/17

android10 commented 6 years ago

@chronvas merged! Thanks for the contribution! :tada: