这里是带错误处理的mvvm的完整实现代码。首先创建一个包含UI状态和资源的类。
public class Resource<T> {
@NonNull public final Status status;
@Nullable public final T data;
@Nullable public final String message;
private Resource(@NonNull Status status, @Nullable T data,
@Nullable String message) {
this.status = status;
this.data = data;
this.message = message;
}
public static <T> Resource<T> success(@NonNull T data) {
return new Resource<>(Status.SUCCESS, data, null);
}
public static <T> Resource<T> error(String msg, @Nullable T data) {
return new Resource<>(Status.ERROR, data, msg);
}
public static <T> Resource<T> loading(@Nullable T data) {
return new Resource<>(Status.LOADING, data, null);
}
public enum Status { SUCCESS, ERROR, LOADING }
}
在您的仓库类上执行以下操作:
public LiveData<Resource<MyBeanClass>> getDetail(String movieId) {
final MutableLiveData<Resource<MyBeanClass>> myBeanClass = new MutableLiveData<>();
ApiInterface apiInterface = new ApiClient().getClient().create(ApiInterface.class);
Call<MyBeanClass> call = apiInterface.getData(id);
call.enqueue(new Callback<MyBeanClass>() {
@Override
public void onResponse(Call<MyBeanClass> call, Response<MyBeanClass> response) {
if (response.body() != null) {
MyBeanClass body = response.body();
myBeanClass.setValue(Resource.success(body));
}
}
@Override
public void onFailure(Call<MyBeanClass> call, Throwable t) {
myBeanClass.setValue(Resource.error(t.getMessage(),null));
}
});
return myBeanClass;
}
在你的viewModel类中:
public class MyViewModel extends ViewModel {
private LiveData<Resource<MyBeanClass>> myLiveData;
public void init(String id) {
movieLiveData = new MyRepository().getInstance().getDetail(id);
}
public LiveData<Resource<MyBeanClass>> getMyLiveData() {
return myLiveData;
}
}
在您的Activity类上
final MyViewModel viewModel =
ViewModelProviders.of(this).get(MyViewModel.class);
viewModel.init(id);
viewModel.getMyLiveData().observe(this, finalData -> {
switch (finalData.status) {
case SUCCESS:
loadDetail(finalData.data);
break;
case LOADING:
break;
case ERROR:
Toast.makeText(this, "no Internet", Toast.LENGTH_SHORT).show();
break;
}
});
如果有帮助的话,请别忘了给个赞。祝编码愉快。