Observer.java revision 936c65df96baaf8c66cdf45a4e1d913e68f24510 
1/*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package androidx.lifecycle;
18
19/**
20 * A simple callback that can receive from {@link LiveData}.
21 *
22 * @param <T> The type of the parameter
23 *
24 * @see LiveData LiveData - for a usage description.
25 */
26public interface Observer<T> {
27    /**
28     * Called when the data is changed.
29     * @param t  The new data
30     */
31    void onChanged(T t);
32}
33