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      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 
     17 package android.app;
     18 
     19 import android.annotation.IdRes;
     20 import android.annotation.Nullable;
     21 import android.view.View;
     22 
     23 /**
     24  * Callbacks to a {@link Fragment}'s container.
     25  */
     26 public 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