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AbsentLiveData.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.example.github.util; import android.arch.lifecycle.LiveData; /** * A LiveData class that has {@code null} value. */ public class AbsentLiveData extends LiveData { private AbsentLiveData() { postValue(null); } public static <T> LiveData<T> create() { //noinspection unchecked return new AbsentLiveData(); } }