，本项目主要有如下功能：

（1）：支持播放在线音乐（2）：按住home键退出页面后显示通知栏部分播放提示， (3) : 支持切换上下首歌曲本项目来自：https://github.com/googlesamples/android-MediaBrowserService 首先配置如下服务： <service        :name=".service.MusicService"        android:exported="true">      <intent-filter>         <action android:name="android.media.browse.MediaBrowserService" />      </intent-filter>    </service>

主要代码如下：

public class BrowseFragment extends Fragment {

    private static final String TAG = LogHelper.makeLogTag(BrowseFragment.class.getSimpleName());

    public static final String ARG_MEDIA_ID = "media_id";

    public static interface FragmentDataHelper {

        void onMediaItemSelected(MediaBrowser.MediaItem item);    }

    // The mediaId to be used for subscribing for children using the MediaBrowser.

    private String mMediaId;

    private MediaBrowser mMediaBrowser;

    private BrowseAdapter mBrowserAdapter;

    private MediaBrowser.SubscriptionCallback mSubscriptionCallback = new MediaBrowser.SubscriptionCallback() {

        @Override

        public void onChildrenLoaded(String parentId, List<MediaBrowser.MediaItem> children) {             mBrowserAdapter.clear();            mBrowserAdapter.notifyDataSetInvalidated();            for (MediaBrowser.MediaItem item : children) {                 mBrowserAdapter.add(item);            }            mBrowserAdapter.notifyDataSetChanged();        }

        @Override

        public void onError(String id) {             Toast.makeText(getActivity(), R.string.error_loading_media,                    Toast.LENGTH_LONG).show();        }    };

    private MediaBrowser.ConnectionCallback mConnectionCallback =

            new MediaBrowser.ConnectionCallback() {         @Override        public void onConnected() {             LogHelper.d(TAG, "onConnected: session token " + mMediaBrowser.getSessionToken());

            if (mMediaId == null) {

                mMediaId = mMediaBrowser.getRoot();            }            mMediaBrowser.subscribe(mMediaId, mSubscriptionCallback);            if (mMediaBrowser.getSessionToken() == null) {                 throw new IllegalArgumentException("No Session token");            }            MediaController mediaController = new MediaController(getActivity(),                    mMediaBrowser.getSessionToken());            getActivity().setMediaController(mediaController);        }

        @Override

        public void onConnectionFailed() {             LogHelper.d(TAG, "onConnectionFailed");        }

        @Override

        public void onConnectionSuspended() {             LogHelper.d(TAG, "onConnectionSuspended");            getActivity().setMediaController(null);        }    };

    public static BrowseFragment newInstance(String mediaId) {

        Bundle args = new Bundle();        args.putString(ARG_MEDIA_ID, mediaId);        BrowseFragment fragment = new BrowseFragment();        fragment.setArguments(args);        return fragment;    }

    @Override

    public View onCreateView(LayoutInflater inflater, ViewGroup container,                             Bundle savedInstanceState) {         View rootView = inflater.inflate(R.layout.fragment_list, container, false);

        mBrowserAdapter = new BrowseAdapter(getActivity());

        View controls = rootView.findViewById(R.id.controls);

        controls.setVisibility(View.GONE);

        ListView listView = (ListView) rootView.findViewById(R.id.list_view);

        listView.setAdapter(mBrowserAdapter);        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {             @Override            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                 MediaBrowser.MediaItem item = mBrowserAdapter.getItem(position);                try {                     FragmentDataHelper listener = (FragmentDataHelper) getActivity();                    listener.onMediaItemSelected(item);                } catch (ClassCastException ex) {                     Log.e(TAG, "Exception trying to cast to FragmentDataHelper", ex);                }            }        });

        Bundle args = getArguments();

        mMediaId = args.getString(ARG_MEDIA_ID, null);

        mMediaBrowser = new MediaBrowser(getActivity(),

                new ComponentName(getActivity(), MusicService.class),                mConnectionCallback, null);

        return rootView;

    }

    @Override

    public void onStart() {         super.onStart();        mMediaBrowser.connect();    }

    @Override

    public void onStop() {         super.onStop();        mMediaBrowser.disconnect();    }

    // An adapter for showing the list of browsed MediaItem's

    private static class BrowseAdapter extends ArrayAdapter<MediaBrowser.MediaItem> {

        public BrowseAdapter(Context context) {

            super(context, R.layout.media_list_item, new ArrayList<MediaBrowser.MediaItem>());        }

        static class ViewHolder {

            ImageView mImageView;            TextView mTitleView;            TextView mDescriptionView;        }

        @Override

        public View getView(int position, View convertView, ViewGroup parent) {

            ViewHolder holder;

            if (convertView == null) {

                convertView = LayoutInflater.from(getContext())                        .inflate(R.layout.media_list_item, parent, false);                holder = new ViewHolder();                holder.mImageView = (ImageView) convertView.findViewById(R.id.play_eq);                holder.mImageView.setVisibility(View.GONE);                holder.mTitleView = (TextView) convertView.findViewById(R.id.title);                holder.mDescriptionView = (TextView) convertView.findViewById(R.id.description);                convertView.setTag(holder);            } else {                 holder = (ViewHolder) convertView.getTag();            }

            MediaBrowser.MediaItem item = getItem(position);

            holder.mTitleView.setText(item.getDescription().getTitle());            holder.mDescriptionView.setText(item.getDescription().getDescription());            if (item.isPlayable()) {                 holder.mImageView.setImageDrawable(                        getContext().getDrawable(R.drawable.ic_play_arrow_white_24dp));                holder.mImageView.setVisibility(View.VISIBLE);            }            return convertView;        }    }}

 

运行效果：

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效果源码：