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      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 package com.example.android.mediabrowserservice;
     17 
     18 import android.app.Fragment;
     19 import android.content.ComponentName;
     20 import android.content.Context;
     21 import android.media.browse.MediaBrowser;
     22 import android.media.session.MediaController;
     23 import android.os.Bundle;
     24 import android.util.Log;
     25 import android.view.LayoutInflater;
     26 import android.view.View;
     27 import android.view.ViewGroup;
     28 import android.widget.AdapterView;
     29 import android.widget.ArrayAdapter;
     30 import android.widget.ImageView;
     31 import android.widget.ListView;
     32 import android.widget.TextView;
     33 import android.widget.Toast;
     34 
     35 import com.example.android.mediabrowserservice.utils.LogHelper;
     36 
     37 import java.util.ArrayList;
     38 import java.util.List;
     39 
     40 /**
     41  * A Fragment that lists all the various browsable queues available
     42  * from a {@link android.service.media.MediaBrowserService}.
     43  * <p/>
     44  * It uses a {@link MediaBrowser} to connect to the {@link MusicService}. Once connected,
     45  * the fragment subscribes to get all the children. All {@link MediaBrowser.MediaItem}'s
     46  * that can be browsed are shown in a ListView.
     47  */
     48 public class BrowseFragment extends Fragment {
     49 
     50     private static final String TAG = LogHelper.makeLogTag(BrowseFragment.class.getSimpleName());
     51 
     52     public static final String ARG_MEDIA_ID = "media_id";
     53 
     54     public static interface FragmentDataHelper {
     55         void onMediaItemSelected(MediaBrowser.MediaItem item);
     56     }
     57 
     58     // The mediaId to be used for subscribing for children using the MediaBrowser.
     59     private String mMediaId;
     60 
     61     private MediaBrowser mMediaBrowser;
     62     private BrowseAdapter mBrowserAdapter;
     63 
     64     private MediaBrowser.SubscriptionCallback mSubscriptionCallback = new MediaBrowser.SubscriptionCallback() {
     65 
     66         @Override
     67         public void onChildrenLoaded(String parentId, List<MediaBrowser.MediaItem> children) {
     68             mBrowserAdapter.clear();
     69             mBrowserAdapter.notifyDataSetInvalidated();
     70             for (MediaBrowser.MediaItem item : children) {
     71                 mBrowserAdapter.add(item);
     72             }
     73             mBrowserAdapter.notifyDataSetChanged();
     74         }
     75 
     76         @Override
     77         public void onError(String id) {
     78             Toast.makeText(getActivity(), R.string.error_loading_media,
     79                     Toast.LENGTH_LONG).show();
     80         }
     81     };
     82 
     83     private MediaBrowser.ConnectionCallback mConnectionCallback =
     84             new MediaBrowser.ConnectionCallback() {
     85         @Override
     86         public void onConnected() {
     87             LogHelper.d(TAG, "onConnected: session token " + mMediaBrowser.getSessionToken());
     88 
     89             if (mMediaId == null) {
     90                 mMediaId = mMediaBrowser.getRoot();
     91             }
     92             mMediaBrowser.subscribe(mMediaId, mSubscriptionCallback);
     93             if (mMediaBrowser.getSessionToken() == null) {
     94                 throw new IllegalArgumentException("No Session token");
     95             }
     96             MediaController mediaController = new MediaController(getActivity(),
     97                     mMediaBrowser.getSessionToken());
     98             getActivity().setMediaController(mediaController);
     99         }
    100 
    101         @Override
    102         public void onConnectionFailed() {
    103             LogHelper.d(TAG, "onConnectionFailed");
    104         }
    105 
    106         @Override
    107         public void onConnectionSuspended() {
    108             LogHelper.d(TAG, "onConnectionSuspended");
    109             getActivity().setMediaController(null);
    110         }
    111     };
    112 
    113     public static BrowseFragment newInstance(String mediaId) {
    114         Bundle args = new Bundle();
    115         args.putString(ARG_MEDIA_ID, mediaId);
    116         BrowseFragment fragment = new BrowseFragment();
    117         fragment.setArguments(args);
    118         return fragment;
    119     }
    120 
    121     @Override
    122     public View onCreateView(LayoutInflater inflater, ViewGroup container,
    123                              Bundle savedInstanceState) {
    124         View rootView = inflater.inflate(R.layout.fragment_list, container, false);
    125 
    126         mBrowserAdapter = new BrowseAdapter(getActivity());
    127 
    128         View controls = rootView.findViewById(R.id.controls);
    129         controls.setVisibility(View.GONE);
    130 
    131         ListView listView = (ListView) rootView.findViewById(R.id.list_view);
    132         listView.setAdapter(mBrowserAdapter);
    133         listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    134             @Override
    135             public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    136                 MediaBrowser.MediaItem item = mBrowserAdapter.getItem(position);
    137                 try {
    138                     FragmentDataHelper listener = (FragmentDataHelper) getActivity();
    139                     listener.onMediaItemSelected(item);
    140                 } catch (ClassCastException ex) {
    141                     Log.e(TAG, "Exception trying to cast to FragmentDataHelper", ex);
    142                 }
    143             }
    144         });
    145 
    146         Bundle args = getArguments();
    147         mMediaId = args.getString(ARG_MEDIA_ID, null);
    148 
    149         mMediaBrowser = new MediaBrowser(getActivity(),
    150                 new ComponentName(getActivity(), MusicService.class),
    151                 mConnectionCallback, null);
    152 
    153         return rootView;
    154     }
    155 
    156     @Override
    157     public void onStart() {
    158         super.onStart();
    159         mMediaBrowser.connect();
    160     }
    161 
    162     @Override
    163     public void onStop() {
    164         super.onStop();
    165         mMediaBrowser.disconnect();
    166     }
    167 
    168     // An adapter for showing the list of browsed MediaItem's
    169     private static class BrowseAdapter extends ArrayAdapter<MediaBrowser.MediaItem> {
    170 
    171         public BrowseAdapter(Context context) {
    172             super(context, R.layout.media_list_item, new ArrayList<MediaBrowser.MediaItem>());
    173         }
    174 
    175         static class ViewHolder {
    176             ImageView mImageView;
    177             TextView mTitleView;
    178             TextView mDescriptionView;
    179         }
    180 
    181         @Override
    182         public View getView(int position, View convertView, ViewGroup parent) {
    183 
    184             ViewHolder holder;
    185 
    186             if (convertView == null) {
    187                 convertView = LayoutInflater.from(getContext())
    188                         .inflate(R.layout.media_list_item, parent, false);
    189                 holder = new ViewHolder();
    190                 holder.mImageView = (ImageView) convertView.findViewById(R.id.play_eq);
    191                 holder.mImageView.setVisibility(View.GONE);
    192                 holder.mTitleView = (TextView) convertView.findViewById(R.id.title);
    193                 holder.mDescriptionView = (TextView) convertView.findViewById(R.id.description);
    194                 convertView.setTag(holder);
    195             } else {
    196                 holder = (ViewHolder) convertView.getTag();
    197             }
    198 
    199             MediaBrowser.MediaItem item = getItem(position);
    200             holder.mTitleView.setText(item.getDescription().getTitle());
    201             holder.mDescriptionView.setText(item.getDescription().getDescription());
    202             if (item.isPlayable()) {
    203                 holder.mImageView.setImageDrawable(
    204                         getContext().getDrawable(R.drawable.ic_play_arrow_white_24dp));
    205                 holder.mImageView.setVisibility(View.VISIBLE);
    206             }
    207             return convertView;
    208         }
    209     }
    210 }
    211