1 /*
2  * Copyright (C) 2014 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 com.android.tv.settings.widget;
18 
19 import android.view.View;
20 import android.view.ViewGroup;
21 import android.widget.Adapter;
22 import android.widget.ListAdapter;
23 
24 /**
25  * The adapter for ScrollAdapterView added more features controlling life cycle.
26  */
27 public interface ScrollAdapterBase extends ListAdapter {
28 
29     /**
30      * optional method to be implemented by {@link Adapter}. {@link #viewRemoved(View)} is called
31      * when a view is removed from ScrollAdapterView, this gives Adapter a chance to do some clean
32      * up work: for example release resources, cancel image downloading task. The implementation
33      * should not destroy the view hierarchy because the view might be recycled and passed as
34      * parameter in next {@link Adapter#getView(int, View, ViewGroup)}.
35      */
viewRemoved(View view)36     public abstract void viewRemoved(View view);
37 
38     /**
39      * Creates a scrap view to measure and decide the size of ScrollAdapterView , the difference
40      * from {@link #getView(int, View, ViewGroup)} is that it shouldn't load any runtime data for
41      * efficiency.
42      */
getScrapView(ViewGroup parent)43     public abstract View getScrapView(ViewGroup parent);
44 
45 }
46