ChannelsRow.java revision 633eb826b8c97731dfc5ef12c7bf78a63734275d 
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
17package com.android.tv.menu;
18
19import android.content.Context;
20
21import com.android.tv.R;
22import com.android.tv.data.ProgramDataManager;
23import com.android.tv.recommendation.RecentChannelEvaluator;
24import com.android.tv.recommendation.Recommender;
25
26public class ChannelsRow extends ItemListRow {
27    public static final String ID = ChannelsRow.class.getName();
28
29    /**
30     * Minimum count for recent channels.
31     */
32    public static final int MIN_COUNT_FOR_RECENT_CHANNELS = 5;
33    /**
34     * Maximum count for recent channels.
35     */
36    public static final int MAX_COUNT_FOR_RECENT_CHANNELS = 10;
37
38    private Recommender mTvRecommendation;
39    private ChannelsRowAdapter mChannelsAdapter;
40    private ChannelsPosterPrefetcher mChannelsPosterPrefetcher;
41
42    public ChannelsRow(Context context, Menu menu, ProgramDataManager programDataManager) {
43        super(context, menu, R.string.menu_title_channels, R.dimen.card_layout_height, null);
44        mTvRecommendation = new Recommender(getContext(), new Recommender.Listener() {
45            @Override
46            public void onRecommenderReady() {
47                mChannelsAdapter.update();
48                mChannelsPosterPrefetcher.prefetch();
49            }
50
51            @Override
52            public void onRecommendationChanged() {
53                mChannelsAdapter.update();
54                mChannelsPosterPrefetcher.prefetch();
55            }
56        }, true);
57        mTvRecommendation.registerEvaluator(new RecentChannelEvaluator());
58        mChannelsAdapter = new ChannelsRowAdapter(context, mTvRecommendation,
59                MIN_COUNT_FOR_RECENT_CHANNELS, MAX_COUNT_FOR_RECENT_CHANNELS);
60        setAdapter(mChannelsAdapter);
61        mChannelsPosterPrefetcher = new ChannelsPosterPrefetcher(context, programDataManager,
62                mChannelsAdapter);
63    }
64
65    @Override
66    public void release() {
67        super.release();
68        if (mTvRecommendation != null) {
69            mTvRecommendation.release();
70            mTvRecommendation = null;
71        }
72        mChannelsPosterPrefetcher.cancel();
73    }
74
75    /**
76     * Handle the update event of the recent channel.
77     */
78    @Override
79    public void onRecentChannelsChanged() {
80        mChannelsPosterPrefetcher.prefetch();
81    }
82
83    @Override
84    public String getId() {
85        return ID;
86    }
87}
88