1/*
2 * Copyright (C) 2015 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 android.app;
18
19import android.annotation.IdRes;
20import android.annotation.Nullable;
21import android.view.View;
22
23/**
24 * Callbacks to a {@link Fragment}'s container.
25 */
26public abstract class FragmentContainer {
27    /**
28     * Return the view with the given resource ID. May return {@code null} if the
29     * view is not a child of this container.
30     */
31    @Nullable
32    public abstract View onFindViewById(@IdRes int id);
33
34    /**
35     * Return {@code true} if the container holds any view.
36     */
37    public abstract boolean onHasView();
38}
39