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33 changes: 33 additions & 0 deletions
33
app/src/main/java/com/github/zsoltk/pokedex/common/Observe.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| package com.github.zsoltk.pokedex.common | ||
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| import androidx.annotation.CheckResult | ||
| import androidx.compose.effectOf | ||
| import androidx.compose.memo | ||
| import androidx.compose.onCommit | ||
| import androidx.compose.state | ||
| import androidx.lifecycle.LiveData | ||
| import androidx.lifecycle.Observer | ||
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| sealed class AsyncState<T> { | ||
| class Initialised<T>: AsyncState<T>() | ||
| class Loading<T>: AsyncState<T>() | ||
| data class Error<T>(val error: Throwable): AsyncState<T>() | ||
| data class Result<T>(val result: T): AsyncState<T>() | ||
| } | ||
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| /** | ||
| * Based on https://medium.com/swlh/android-mvi-with-jetpack-compose-b0890f5156ac | ||
| */ | ||
| @CheckResult(suggest = "+") | ||
| fun <T> observe(data: LiveData<T>) = effectOf<T?> { | ||
| var result by +state { data.value } | ||
| val observer = +memo { Observer<T> { result = it } } | ||
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| +onCommit(data) { | ||
| data.observeForever(observer) | ||
| onDispose { data.removeObserver(observer) } | ||
| } | ||
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| result | ||
| } |
34 changes: 34 additions & 0 deletions
34
app/src/main/java/com/github/zsoltk/pokedex/entity/PokemonApi.kt
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,34 @@ | ||
| package com.github.zsoltk.pokedex.entity | ||
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| import androidx.annotation.FloatRange | ||
| import io.reactivex.Observable | ||
| import io.reactivex.android.schedulers.AndroidSchedulers | ||
| import java.lang.RuntimeException | ||
| import java.util.concurrent.TimeUnit | ||
| import kotlin.random.Random | ||
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| object PokemonApi { | ||
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| /** | ||
| * Just for demonstration purposes. | ||
| * You could do the same with a proper API. | ||
| * You could also do the same with LiveData if you wish. | ||
| */ | ||
| fun loadPokemon(): Observable<List<Pokemon>> = | ||
| Observable | ||
| .just(pokemons) | ||
| .delay(200, TimeUnit.MILLISECONDS, AndroidSchedulers.mainThread()) | ||
| .map { | ||
| if (Random.nextFloat() < randomFailureChance) throw FakeApiException() | ||
| it | ||
| } | ||
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| /** | ||
| * Feel free to try different values to test error screen | ||
| */ | ||
| @FloatRange(from = 0.0, to = 1.0) | ||
| val randomFailureChance: Float = 0.1f | ||
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| class FakeApiException : RuntimeException("Test exception, please ignore") | ||
| } |
26 changes: 26 additions & 0 deletions
26
app/src/main/java/com/github/zsoltk/pokedex/entity/PokemonLiveData.kt
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,26 @@ | ||
| package com.github.zsoltk.pokedex.entity | ||
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| import androidx.lifecycle.MutableLiveData | ||
| import com.github.zsoltk.pokedex.common.AsyncState | ||
| import io.reactivex.android.schedulers.AndroidSchedulers | ||
| import io.reactivex.disposables.Disposable | ||
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| class PokemonLiveData : MutableLiveData<AsyncState<List<Pokemon>>>() { | ||
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| init { | ||
| reload() | ||
| } | ||
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| private var disposable: Disposable? = null | ||
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| fun reload() { | ||
| disposable?.dispose() | ||
| disposable = PokemonApi | ||
| .loadPokemon() | ||
| .observeOn(AndroidSchedulers.mainThread()) | ||
| .map { AsyncState.Result(it) as AsyncState<List<Pokemon>> } | ||
| .startWith(AsyncState.Loading()) | ||
| .onErrorReturn { AsyncState.Error(it) } | ||
| .subscribe { value = it } | ||
| } | ||
| } |
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