[英]How to create UseCase for MVVM Clean architecture in android
RepositoryClass存储库类
public Observable<Weather> requestWeather (String location,String unit,String appId){
return weatherAPI.requestWeather(location, unit,appId);
}
GetUseCase获取用例
public interface GetUseCase {
void execute(String location,String unit,String appId);
}
GetUseCaseImpl获取用例实现
public class GetUseCaseImpl implements GetUseCase {
private WeatherRepositorty weatherRepositorty;
private CompositeDisposable disposable = new CompositeDisposable();
private MutableLiveData<WeatherViewStated> mutableLiveData = new MutableLiveData<>();
public GetUseCaseImpl() {
weatherRepositorty = WeatherRepositorty.getInstance();
}
@Override
public void execute(String location, String unit, String appId) {
disposable.add(weatherRepositorty.requestWeather(location, unit, appId).subscribeOn(Schedulers.io()).doOnSubscribe((newsList) -> onLoading())
.subscribe(this::onSuccess,
this::onError));
}
private void onSuccess(Weather weather) {
WeatherViewStated.SUCCESS_STATE.setData(weather);
mutableLiveData.postValue(WeatherViewStated.SUCCESS_STATE);
}
private void onError(Throwable error) {
WeatherViewStated.ERROR_STATE.setError(error);
mutableLiveData.postValue(WeatherViewStated.ERROR_STATE);
}
private void onLoading() {
mutableLiveData.postValue(WeatherViewStated.LOADING_STATE);
}
}
WeatherViewStated WeatherViewStated
public class WeatherViewStated extends WeatherViewState<Weather> {
private WeatherViewStated(Weather data, int currentState, Throwable error) {
this.data = data;
this.error = error;
this.currentState = currentState;
}
public static WeatherViewStated ERROR_STATE = new WeatherViewStated(null, WeatherViewState.State.FAILED.value, new Throwable());
public static WeatherViewStated LOADING_STATE = new WeatherViewStated(null, State.LOADING.value, null);
public static WeatherViewStated SUCCESS_STATE = new WeatherViewStated(new Weather(), State.SUCCESS.value, null);
}
WeatherViewModel天气视图模型
public class WeatherViewModel extends ViewModel {
private MutableLiveData<Weather> mutableWeatherLiveData;
private WeatherRepositorty weatherRepositorty;
public void init(String location,String unit,String appID) {
}
}
This is my code i am trying to write code using mvvm clean architecture but i am unable to add code in GetUseCase and GetUseCaseImpl so that i can get MutableLiveDta success and failure state in viewmodel class so that i can use it in MainActvitiy please suggest me how to call and how to get data in View Model .这是我的代码,我正在尝试使用 mvvm clean 架构编写代码,但我无法在 GetUseCase 和 GetUseCaseImpl 中添加代码,以便我可以在 viewmodel 类中获得 MutableLiveDta 成功和失败状态,以便我可以在 MainActvitiy 中使用它,请建议我如何调用以及如何在 View Model 中获取数据。
Change UseCase更改用例
public interface GetUseCase {
void execute(String location,String unit,String appId);
}
To到
public interface GetUseCase {
Observable<Weather> execute(String location,String unit,String appId);
}
GetUseCaseImpl To GetUseCaseImpl 到
public class GetUseCaseImpl implements GetUseCase {
private WeatherRepositorty weatherRepositorty;
public GetUseCaseImpl() {
weatherRepositorty = WeatherRepositorty.getInstance();
}
@Override
public Observable<Weather> execute(String location, String unit, String appId) {
return weatherRepositorty.requestWeather(location, unit, appId)
}
}
ViewModel视图模型
public class WeatherViewModel extends ViewModel {
private CompositeDisposable disposable = new CompositeDisposable();
private MutableLiveData<WeatherViewStated> mutableLiveData = new
MutableLiveData<>();
private GetUseCaseImpl useCaseImpl = new GetUseCaseImpl()
public void init(String location,String unit,String appID) {
disposable.add(useCaseImpl.execute(location, unit, appId).subscribeOn(Schedulers.io()).doOnSubscribe((newsList) -> onLoading())
.subscribe(this::onSuccess,
this::onError));
}
private void onSuccess(Weather weather) {
WeatherViewStated.SUCCESS_STATE.setData(weather);
mutableLiveData.postValue(WeatherViewStated.SUCCESS_STATE);
}
private void onError(Throwable error) {
WeatherViewStated.ERROR_STATE.setError(error);
mutableLiveData.postValue(WeatherViewStated.ERROR_STATE);
}
private void onLoading() {
mutableLiveData.postValue(WeatherViewStated.LOADING_STATE);
}
override fun onCleared() {
disposable.clear()
}
}
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