samples-flatfoot/ApiReviewDemo/app/src/main/java/com/android/flatfoot/apireviewdemo/lifecycle_03_viewmodel/AccountViewModel.java

/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.flatfoot.apireviewdemo.lifecycle_03_viewmodel;

import android.arch.lifecycle.MutableLiveData;
import android.arch.lifecycle.ViewModel;
import android.support.annotation.NonNull;

import com.android.flatfoot.apireviewdemo.common.entity.Person;

public class AccountViewModel extends ViewModel {

    static class PersonDataWithStatus {
        final Person person;
        final String errorMsg;
        final boolean loading;

        PersonDataWithStatus(Person person, String errorMsg, boolean loading) {
            this.person = person;
            this.errorMsg = errorMsg;
            this.loading = loading;
        }
    }

    public final MutableLiveData<PersonDataWithStatus> personData = new MutableLiveData<>();

    public AccountViewModel() {
        personData.setValue(new PersonDataWithStatus(null, null, true));
        DataManagement.getInstance().requestPersonData("jakewharton",
                new DataManagement.Callback() {
                    @Override
                    public void success(@NonNull Person person) {
                        personData.setValue(new PersonDataWithStatus(person, null, false));
                    }

                    @Override
                    public void failure(String errorMsg) {
                        personData.setValue(new PersonDataWithStatus(null, errorMsg, false));
                    }
                });
    }
}