1 package android.support.v4.app;
2 
3 import android.support.annotation.IdRes;
4 import android.support.annotation.Nullable;
5 import android.view.View;
6 
7 
8 /**
9  * Callbacks to a {@link Fragment}'s container.
10  */
11 public abstract class FragmentContainer {
12     /**
13      * Return the view with the given resource ID. May return {@code null} if the
14      * view is not a child of this container.
15      */
16     @Nullable
onFindViewById(@dRes int id)17     public abstract View onFindViewById(@IdRes int id);
18 
19     /**
20      * Return {@code true} if the container holds any view.
21      */
onHasView()22     public abstract boolean onHasView();
23 }
24