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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 package com.example.android.supportv4.media;
     17 
     18 import android.content.ComponentName;
     19 import android.content.Context;
     20 import android.os.Bundle;
     21 import android.os.RemoteException;
     22 import android.support.v4.app.Fragment;
     23 import android.support.v4.content.ContextCompat;
     24 import android.support.v4.media.MediaBrowserCompat;
     25 import android.support.v4.media.session.MediaControllerCompat;
     26 import android.util.Log;
     27 import android.view.LayoutInflater;
     28 import android.view.View;
     29 import android.view.ViewGroup;
     30 import android.widget.AbsListView;
     31 import android.widget.AdapterView;
     32 import android.widget.ArrayAdapter;
     33 import android.widget.ImageView;
     34 import android.widget.ListView;
     35 import android.widget.TextView;
     36 import android.widget.Toast;
     37 
     38 import com.example.android.supportv4.R;
     39 
     40 import java.util.ArrayList;
     41 import java.util.HashSet;
     42 import java.util.List;
     43 import java.util.Set;
     44 
     45 /**
     46  * A Fragment that lists all the various browsable queues available
     47  * from a {@link android.service.media.MediaBrowserService}.
     48  * <p/>
     49  * It uses a {@link MediaBrowserCompat} to connect to the {@link MediaBrowserServiceSupport}.
     50  * Once connected, the fragment subscribes to get all the children. All
     51  * {@link MediaBrowserCompat.MediaItem} objects that can be browsed are shown in a ListView.
     52  */
     53 public class BrowseFragment extends Fragment {
     54 
     55     private static final String TAG = "BrowseFragment";
     56 
     57     public static final String ARG_MEDIA_ID = "media_id";
     58 
     59     // The number of media items per page.
     60     private static final int PAGE_SIZE = 6;
     61 
     62     public static interface FragmentDataHelper {
     63         void onMediaItemSelected(MediaBrowserCompat.MediaItem item);
     64     }
     65 
     66     // The mediaId to be used for subscribing for children using the MediaBrowser.
     67     private String mMediaId;
     68     private final List<MediaBrowserCompat.MediaItem> mMediaItems = new ArrayList<>();
     69 
     70     private boolean mCanLoadNewPage;
     71     private final Set<Integer> mSubscribedPages = new HashSet<Integer>();
     72     private MediaBrowserCompat mMediaBrowser;
     73     private BrowseAdapter mBrowserAdapter;
     74 
     75     private MediaBrowserCompat.SubscriptionCallback mSubscriptionCallback =
     76             new MediaBrowserCompat.SubscriptionCallback() {
     77         @Override
     78         public void onChildrenLoaded(String parentId, List<MediaBrowserCompat.MediaItem> children,
     79                 Bundle options) {
     80             int page = options.getInt(MediaBrowserCompat.EXTRA_PAGE, -1);
     81             int pageSize = options.getInt(MediaBrowserCompat.EXTRA_PAGE_SIZE, -1);
     82             if (page < 0 || pageSize != PAGE_SIZE || children == null
     83                     || children.size() > PAGE_SIZE) {
     84                 return;
     85             }
     86 
     87             int itemIndex = page * PAGE_SIZE;
     88             if (itemIndex >= mMediaItems.size()) {
     89                 if (children.size() == 0) {
     90                     return;
     91                 }
     92                 // An additional page is loaded.
     93                 mMediaItems.addAll(children);
     94             } else {
     95                 // An existing page is replaced by the newly loaded page.
     96                 for (MediaBrowserCompat.MediaItem item : children) {
     97                     if (itemIndex < mMediaItems.size()) {
     98                         mMediaItems.set(itemIndex, item);
     99                     } else {
    100                         mMediaItems.add(item);
    101                     }
    102                     itemIndex++;
    103                 }
    104 
    105                 // If the newly loaded page contains less than {PAGE_SIZE} items,
    106                 // then this page should be the last page.
    107                 if (children.size() < PAGE_SIZE) {
    108                     while (mMediaItems.size() > itemIndex) {
    109                         mMediaItems.remove(mMediaItems.size() - 1);
    110                     }
    111                 }
    112             }
    113             mBrowserAdapter.notifyDataSetChanged();
    114             mCanLoadNewPage = true;
    115         }
    116 
    117         @Override
    118         public void onChildrenLoaded(String parentId, List<MediaBrowserCompat.MediaItem> children) {
    119             Log.d(TAG, "onChildrenLoaded: parentId=" + parentId);
    120             mMediaItems.clear();
    121             mMediaItems.addAll(children);
    122             mBrowserAdapter.notifyDataSetChanged();
    123         }
    124 
    125         @Override
    126         public void onError(String id) {
    127             Toast.makeText(getActivity(), R.string.error_loading_media,
    128                     Toast.LENGTH_LONG).show();
    129         }
    130     };
    131 
    132     private MediaBrowserCompat.ConnectionCallback mConnectionCallback =
    133             new MediaBrowserCompat.ConnectionCallback() {
    134         @Override
    135         public void onConnected() {
    136             Log.d(TAG, "onConnected: session token " + mMediaBrowser.getSessionToken());
    137 
    138             if (mMediaBrowser.getSessionToken() == null) {
    139                 throw new IllegalArgumentException("No Session token");
    140             }
    141             MediaControllerCompat mediaController = null;
    142             try {
    143                 mediaController = new MediaControllerCompat(getActivity(),
    144                         mMediaBrowser.getSessionToken());
    145             } catch (RemoteException e) {
    146                 Log.e(TAG, "Failed to create MediaController.", e);
    147             }
    148             ((MediaBrowserSupport) getActivity()).setMediaController(mediaController);
    149 
    150             if (mMediaId == null) {
    151                 mMediaId = mMediaBrowser.getRoot();
    152             }
    153 
    154             if (mMediaItems.size() == 0) {
    155                 loadPage(0);
    156             }
    157         }
    158 
    159         @Override
    160         public void onConnectionFailed() {
    161             Log.d(TAG, "onConnectionFailed");
    162         }
    163 
    164         @Override
    165         public void onConnectionSuspended() {
    166             Log.d(TAG, "onConnectionSuspended");
    167             ((MediaBrowserSupport) getActivity()).setMediaController((MediaControllerCompat) null);
    168         }
    169     };
    170 
    171     public static BrowseFragment newInstance(String mediaId) {
    172         Bundle args = new Bundle();
    173         args.putString(ARG_MEDIA_ID, mediaId);
    174         BrowseFragment fragment = new BrowseFragment();
    175         fragment.setArguments(args);
    176         return fragment;
    177     }
    178 
    179     @Override
    180     public View onCreateView(LayoutInflater inflater, ViewGroup container,
    181             Bundle savedInstanceState) {
    182         View rootView = inflater.inflate(R.layout.fragment_list, container, false);
    183 
    184         mBrowserAdapter = new BrowseAdapter(getActivity(), mMediaItems);
    185 
    186         View controls = rootView.findViewById(R.id.controls);
    187         controls.setVisibility(View.GONE);
    188 
    189         ListView listView = (ListView) rootView.findViewById(R.id.list_view);
    190         listView.setAdapter(mBrowserAdapter);
    191         listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    192             @Override
    193             public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    194                 MediaBrowserCompat.MediaItem item = mBrowserAdapter.getItem(position);
    195                 try {
    196                     FragmentDataHelper listener = (FragmentDataHelper) getActivity();
    197                     listener.onMediaItemSelected(item);
    198                 } catch (ClassCastException ex) {
    199                     Log.e(TAG, "Exception trying to cast to FragmentDataHelper", ex);
    200                 }
    201             }
    202         });
    203 
    204         Bundle args = getArguments();
    205         mMediaId = args.getString(ARG_MEDIA_ID, null);
    206 
    207         mMediaBrowser = new MediaBrowserCompat(getActivity(),
    208                 new ComponentName(getActivity(), MediaBrowserServiceSupport.class),
    209                 mConnectionCallback, null);
    210 
    211         listView.setOnScrollListener(new AbsListView.OnScrollListener() {
    212             @Override
    213             public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,
    214                     int totalItemCount) {
    215                 if (mCanLoadNewPage && firstVisibleItem + visibleItemCount == totalItemCount) {
    216                     mCanLoadNewPage = false;
    217                     loadPage((mMediaItems.size() + PAGE_SIZE - 1) / PAGE_SIZE);
    218                 }
    219             }
    220 
    221             @Override
    222             public void onScrollStateChanged(AbsListView view, int scrollState) {
    223                 // Do nothing
    224             }
    225         });
    226 
    227         return rootView;
    228     }
    229 
    230     @Override
    231     public void onStart() {
    232         super.onStart();
    233         mMediaBrowser.connect();
    234     }
    235 
    236     @Override
    237     public void onStop() {
    238         super.onStop();
    239         mMediaBrowser.disconnect();
    240         mSubscribedPages.clear();
    241     }
    242 
    243     private void loadPage(int page) {
    244         Integer pageInteger = Integer.valueOf(page);
    245         if (mSubscribedPages.contains(pageInteger)) {
    246             return;
    247         }
    248         mSubscribedPages.add(pageInteger);
    249         Bundle options = new Bundle();
    250         options.putInt(MediaBrowserCompat.EXTRA_PAGE, page);
    251         options.putInt(MediaBrowserCompat.EXTRA_PAGE_SIZE, PAGE_SIZE);
    252         mMediaBrowser.subscribe(mMediaId, options, mSubscriptionCallback);
    253     }
    254 
    255     // An adapter for showing the list of browsed MediaItem objects
    256     private static class BrowseAdapter extends ArrayAdapter<MediaBrowserCompat.MediaItem> {
    257 
    258         public BrowseAdapter(Context context, List<MediaBrowserCompat.MediaItem> mediaItems) {
    259             super(context, R.layout.media_list_item, mediaItems);
    260         }
    261 
    262         static class ViewHolder {
    263             ImageView mImageView;
    264             TextView mTitleView;
    265             TextView mDescriptionView;
    266         }
    267 
    268         @Override
    269         public View getView(int position, View convertView, ViewGroup parent) {
    270 
    271             ViewHolder holder;
    272 
    273             if (convertView == null) {
    274                 convertView = LayoutInflater.from(getContext())
    275                         .inflate(R.layout.media_list_item, parent, false);
    276                 holder = new ViewHolder();
    277                 holder.mImageView = (ImageView) convertView.findViewById(R.id.play_eq);
    278                 holder.mImageView.setVisibility(View.GONE);
    279                 holder.mTitleView = (TextView) convertView.findViewById(R.id.title);
    280                 holder.mDescriptionView = (TextView) convertView.findViewById(R.id.description);
    281                 convertView.setTag(holder);
    282             } else {
    283                 holder = (ViewHolder) convertView.getTag();
    284             }
    285 
    286             MediaBrowserCompat.MediaItem item = getItem(position);
    287             holder.mTitleView.setText(item.getDescription().getTitle());
    288             holder.mDescriptionView.setText(item.getDescription().getDescription());
    289             if (item.isPlayable()) {
    290 
    291                 holder.mImageView.setImageDrawable(ContextCompat.getDrawable(
    292                         getContext(), R.drawable.ic_play_arrow_white_24dp));
    293                 holder.mImageView.setVisibility(View.VISIBLE);
    294             } else {
    295                 holder.mImageView.setVisibility(View.GONE);
    296             }
    297             return convertView;
    298         }
    299     }
    300 }