1/*
2 * Copyright 2018 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.fragment.app;
18
19import android.content.Context;
20import android.os.Bundle;
21import android.view.View;
22
23import androidx.annotation.IdRes;
24import androidx.annotation.Nullable;
25
26
27/**
28 * Callbacks to a {@link Fragment}'s container.
29 */
30public abstract class FragmentContainer {
31    /**
32     * Return the view with the given resource ID. May return {@code null} if the
33     * view is not a child of this container.
34     */
35    @Nullable
36    public abstract View onFindViewById(@IdRes int id);
37
38    /**
39     * Return {@code true} if the container holds any view.
40     */
41    public abstract boolean onHasView();
42
43
44    /**
45     * Creates an instance of the specified fragment, can be overridden to construct fragments
46     * with dependencies, or change the fragment being constructed. By default just calls
47     * {@link Fragment#instantiate(Context, String, Bundle)}.
48     */
49    public Fragment instantiate(Context context, String className, Bundle arguments) {
50        return Fragment.instantiate(context, className, arguments);
51    }
52}
53