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 17 package androidx.fragment.app; 18 19 import android.content.Context; 20 import android.os.Bundle; 21 import android.view.View; 22 23 import androidx.annotation.IdRes; 24 import androidx.annotation.Nullable; 25 26 27 /** 28 * Callbacks to a {@link Fragment}'s container. 29 */ 30 public 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 onFindViewById(@dRes int id)36 public abstract View onFindViewById(@IdRes int id); 37 38 /** 39 * Return {@code true} if the container holds any view. 40 */ onHasView()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 */ instantiate(Context context, String className, Bundle arguments)49 public Fragment instantiate(Context context, String className, Bundle arguments) { 50 return Fragment.instantiate(context, className, arguments); 51 } 52 } 53