Kotlin，proguard，Android体系结构组件

Question

I have a view model with a live data variable in there.

My activity observes it in order to update the UI.

In debug, it is all working nicely. When I enable proguard, it does not observe anymore the livedata changes.

I have checked that the live data is properly updated. However, the observer callback is never called.

Any hints on how to configure Proguard and what could be wrong?

I tried keeping classes of my package without success:

-keep class com.example.myapp.** { *; }

Here is the ViewModel:

class SplashViewModelImpl : JapetViewModel(), SplashViewModel {    
    private val isTimeUp = MutableLiveData<Boolean>()

    init {
        isTimeUp.value = false
        Observable.timer(2000L, TimeUnit.MILLISECONDS)
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe { isTimeUp.postValue(true) }

    }

    override fun isTimeUp(): LiveData<Boolean> = isTimeUp
}

And the activity:

class SplashActivity : MyBaseActivity() {

    lateinit var viewModel: SplashViewModel

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_splash)

        viewModel = kodein.with(this).instance()

        // Working in debug
        // viewModel.isTimeUp().observe(this, Observer(this::transitionIfTimeUp))

        // Working in debug too, tried this way of writing it too
        viewModel.isTimeUp().observe(this, Observer<Boolean> { t -> transitionIfTimeUp(t) })

        // Also tried doing it with an object : Observer... without success either
    }

    private fun transitionIfTimeUp(isTimeUp: Boolean?) {
        if (isTimeUp == null || !isTimeUp) return

        startActivity<LoginActivity>()
        finish()
    }
}

---

Edited: dependencies

testCompile "android.arch.persistence.room:testing:1.0.0-alpha3"
androidTestCompile "android.arch.persistence.room:testing:1.0.0-alpha3"

compile "android.arch.lifecycle:extensions:1.0.0-alpha3"
compile "android.arch.lifecycle:reactivestreams:1.0.0-alpha3"
kapt "android.arch.lifecycle:compiler:1.0.0-alpha3"

compile "android.arch.persistence.room:runtime:1.0.0-alpha3"
compile "android.arch.persistence.room:rxjava2:1.0.0-alpha3"
kapt "android.arch.persistence.room:compiler:1.0.0-alpha3"

Answer 1

You must upgrade to alpha4 to get the appropriate ProGuard configuration.

alpha3 had a issue in that it did not include the appropriate ProGuard configuration. As per the alpha4 release notes , this has been fixed.

Answer 2

I guess you are looking for the operator Observable.interval and not Observable.timer

The one you are using emits ONLY ONCE after the specified time. However Observable.interval emits continuously every the specified interval.