update

app/build.gradle

@@ -25,7 +25,7 @@ android {
 dependencies {
     implementation fileTree(dir: "libs", include: ["*.jar"])
     implementation 'androidx.appcompat:appcompat:1.2.0'
-    implementation 'androidx.constraintlayout:constraintlayout:2.0.2'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
     implementation 'androidx.work:work-runtime:2.4.0'
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'androidx.test.ext:junit:1.1.2'

app/src/main/AndroidManifest.xml

@@ -25,6 +25,11 @@
                 <action android:name="android.media.browse.MediaBrowserService" />
             </intent-filter>
         </service>
+        <receiver android:name="androidx.media.session.MediaButtonReceiver" >
+            <intent-filter>
+                <action android:name="android.intent.action.MEDIA_BUTTON" />
+            </intent-filter>
+        </receiver>
     </application>
 
 </manifest>

app/src/main/java/com/yutou/nas_music_player/containers/MediaBrowserHelper.java

@@ -4,9 +4,16 @@ import android.content.ComponentName;
 import android.content.Context;
 import android.os.RemoteException;
 import android.support.v4.media.MediaBrowserCompat;
+import android.support.v4.media.MediaMetadataCompat;
 import android.support.v4.media.session.MediaControllerCompat;
+import android.support.v4.media.session.MediaSessionCompat;
+import android.support.v4.media.session.PlaybackStateCompat;
 
 import com.yutou.nas_music_player.services.MusicService;
+import com.yutou.nas_music_player.views.MainActivity;
+
+import java.util.ArrayList;
+import java.util.List;
 
 public class MediaBrowserHelper {
     private MediaControllerCompat controllerCompat;
@@ -36,6 +43,10 @@ public class MediaBrowserHelper {
     public MediaControllerCompat.TransportControls getTransportControls() {
         return controllerCompat.getTransportControls();
     }
+    private List<MediaControllerCompat.Callback> callbacks=new ArrayList<>();
+    public void regPlayListener(MediaControllerCompat.Callback playListener) {
+        callbacks.add(playListener);
+    }
 
     private class MediaBrowserConnectionCallback extends MediaBrowserCompat.ConnectionCallback {
         @Override
@@ -57,7 +68,37 @@ public class MediaBrowserHelper {
 
 
     private class MediaControllerCallback extends MediaControllerCompat.Callback {
+        @Override
+        public void onPlaybackStateChanged(PlaybackStateCompat state) {
+            super.onPlaybackStateChanged(state);
+            for (MediaControllerCompat.Callback callback : callbacks) {
+                callback.onPlaybackStateChanged(state);
+            }
+        }
 
+        @Override
+        public void onMetadataChanged(MediaMetadataCompat metadata) {
+            super.onMetadataChanged(metadata);
+            for (MediaControllerCompat.Callback callback : callbacks) {
+                callback.onMetadataChanged(metadata);
+            }
+        }
+
+        @Override
+        public void onSessionDestroyed() {
+            super.onSessionDestroyed();
+            for (MediaControllerCompat.Callback callback : callbacks) {
+                callback.onSessionDestroyed();
+            }
+        }
+
+        @Override
+        public void onQueueChanged(List<MediaSessionCompat.QueueItem> queue) {
+            super.onQueueChanged(queue);
+            for (MediaControllerCompat.Callback callback : callbacks) {
+                callback.onQueueChanged(queue);
+            }
+        }
     }
     public class MediaBrowserSubscriptionCallback extends MediaBrowserCompat.SubscriptionCallback {
 

app/src/main/java/com/yutou/nas_music_player/containers/MediaNotificationManager.java

@@ -1,4 +1,154 @@
 package com.yutou.nas_music_player.containers;
 
+import android.app.Notification;
+import android.app.NotificationChannel;
+import android.app.NotificationManager;
+import android.app.PendingIntent;
+import android.content.Context;
+import android.content.Intent;
+import android.graphics.Color;
+import android.os.Build;
+import android.support.v4.media.MediaDescriptionCompat;
+import android.support.v4.media.MediaMetadataCompat;
+import android.support.v4.media.session.MediaSessionCompat;
+import android.support.v4.media.session.PlaybackStateCompat;
+import android.util.Log;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.RequiresApi;
+import androidx.core.app.NotificationCompat;
+import androidx.core.graphics.drawable.IconCompat;
+import androidx.media.session.MediaButtonReceiver;
+
+import com.yutou.nas_music_player.MyApplication;
+import com.yutou.nas_music_player.R;
+import com.yutou.nas_music_player.services.MusicService;
+import com.yutou.nas_music_player.views.MainActivity;
+
 public class MediaNotificationManager {
+    public static final int NOTIFICATION_ID = 412;
+    private static final String CHANNEL_ID = MyApplication.application.getPackageName() + ".music_channel";
+    private MusicService mService;
+    private NotificationCompat.Action mPlayAction;
+    private NotificationCompat.Action mPauseAction;
+    private NotificationCompat.Action mNextAction;
+    private NotificationCompat.Action mPrevAction;
+    private NotificationManager mNotificationManager;
+
+    public MediaNotificationManager(MusicService musicService) {
+        this.mService = musicService;
+        mNotificationManager =
+                (NotificationManager) mService.getSystemService(Context.NOTIFICATION_SERVICE);
+
+        mPlayAction =
+                new NotificationCompat.Action(
+                        android.R.drawable.ic_media_play,
+                        "播放",
+                        MediaButtonReceiver.buildMediaButtonPendingIntent(
+                                mService,
+                                PlaybackStateCompat.ACTION_PLAY));
+        mPauseAction =
+                new NotificationCompat.Action(
+                        android.R.drawable.ic_media_pause,
+                        "暂停",
+                        MediaButtonReceiver.buildMediaButtonPendingIntent(
+                                mService,
+                                PlaybackStateCompat.ACTION_PAUSE));
+        mNextAction =
+                new NotificationCompat.Action(
+                        android.R.drawable.ic_media_next,
+                        "下一首",
+                        MediaButtonReceiver.buildMediaButtonPendingIntent(
+                                mService,
+                                PlaybackStateCompat.ACTION_SKIP_TO_NEXT));
+        mPrevAction =
+                new NotificationCompat.Action(
+                        android.R.drawable.ic_media_previous,
+                        "上一首",
+                        MediaButtonReceiver.buildMediaButtonPendingIntent(
+                                mService,
+                                PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS));
+
+        // Cancel all notifications to handle the case where the Service was killed and
+        // restarted by the system.
+        mNotificationManager.cancelAll();
+    }
+
+    public NotificationManager getManager() {
+        return mNotificationManager;
+    }
+    public Notification getNotification(MediaMetadataCompat metadata,
+                                        @NonNull PlaybackStateCompat state,
+                                        MediaSessionCompat.Token token) {
+        boolean isPlaying = state.getState() == PlaybackStateCompat.STATE_PLAYING;
+        MediaDescriptionCompat description = metadata.getDescription();
+        NotificationCompat.Builder builder =
+                buildNotification(state, token, isPlaying, metadata);
+        return builder.build();
+    }
+
+    private NotificationCompat.Builder buildNotification(@NonNull PlaybackStateCompat state,
+                                                         MediaSessionCompat.Token token,
+                                                         boolean isPlaying,
+                                                         MediaMetadataCompat metadata) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            createChannel();
+        }
+        MediaDescriptionCompat description = metadata.getDescription();
+        NotificationCompat.Builder builder = new NotificationCompat.Builder(mService, CHANNEL_ID);
+        builder.setStyle(new androidx.media.app.NotificationCompat.MediaStyle()
+                .setMediaSession(token)
+                .setShowActionsInCompactView(0,1,2)
+                .setShowCancelButton(true)
+                .setCancelButtonIntent(MediaButtonReceiver.buildMediaButtonPendingIntent(mService,PlaybackStateCompat.ACTION_STOP))
+        );
+        builder.setColor(Color.BLUE);
+        if(metadata.getBitmap(MediaMetadataCompat.METADATA_KEY_DISPLAY_ICON)!=null){
+            builder.setLargeIcon(metadata.getBitmap(MediaMetadataCompat.METADATA_KEY_DISPLAY_ICON));
+        }
+        builder.setSmallIcon(R.mipmap.ic_launcher);
+        builder.setContentIntent(mService.mediaSession.getController().getSessionActivity());
+        builder.setContentTitle(description.getTitle());
+        builder.setContentText(description.getSubtitle());
+        builder.setDeleteIntent(MediaButtonReceiver.buildMediaButtonPendingIntent(
+                mService, PlaybackStateCompat.ACTION_STOP));
+        builder.setVisibility(NotificationCompat.VISIBILITY_PUBLIC);
+        if ((state.getActions() & PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS) != 0) {
+            builder.addAction(mPrevAction);
+        }
+        builder.addAction(isPlaying ? mPauseAction : mPlayAction);
+        if ((state.getActions() & PlaybackStateCompat.ACTION_SKIP_TO_NEXT) != 0) {
+            builder.addAction(mNextAction);
+        }
+        return builder;
+    }
+
+    // Does nothing on versions of Android earlier than O.
+    @RequiresApi(Build.VERSION_CODES.O)
+    private void createChannel() {
+        if (mNotificationManager.getNotificationChannel(CHANNEL_ID) == null) {
+            // The user-visible name of the channel.
+            CharSequence name = "NAS音乐播放器";
+            // The user-visible description of the channel.
+            String description = "NAS音乐播放器通知栏";
+            int importance = NotificationManager.IMPORTANCE_LOW;
+            NotificationChannel mChannel = new NotificationChannel(CHANNEL_ID, name, importance);
+            // Configure the notification channel.
+            mChannel.setDescription(description);
+            mChannel.enableLights(true);
+            // Sets the notification light color for notifications posted to this
+            // channel, if the device supports this feature.
+            mChannel.setLightColor(Color.RED);
+            mChannel.enableVibration(true);
+            mChannel.setVibrationPattern(
+                    new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400});
+            mNotificationManager.createNotificationChannel(mChannel);
+        }
+    }
+    private PendingIntent createContentIntent() {
+        Intent openUI = new Intent(mService, MainActivity.class);
+        openUI.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
+        return PendingIntent.getActivity(
+                mService, 233, openUI, PendingIntent.FLAG_CANCEL_CURRENT);
+    }
 }

app/src/main/java/com/yutou/nas_music_player/containers/MusicContainer.java

@@ -13,6 +13,8 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.Random;
 
+import static android.media.MediaMetadata.METADATA_KEY_DISPLAY_ICON;
+
 
 public class MusicContainer {
     private static MusicContainer container;
@@ -24,8 +26,23 @@ public class MusicContainer {
 
     private MusicContainer() {
         mediaPlayer = new MediaPlayer();
+        initMediaPlayer();
         libs = new MusicLibs();
     }
+    private void initMediaPlayer(){
+        mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
+            @Override
+            public void onCompletion(MediaPlayer mp) {
+
+            }
+        });
+    }
+    public MediaPlayer getMediaPlayer(){
+        return mediaPlayer;
+    }
+    public MusicData getNowPlayData(){
+        return nowPlayData;
+    }
 
     public static MusicContainer getInstance() {
         if (container == null) {
@@ -44,8 +61,7 @@ public class MusicContainer {
     }
 
     public void play(MusicData data) {
-        String url = NetworkTool.NetworkAPI.HOME + NetworkTool.NetworkAPI.MUSIC_PLAY
+        String url =data.getPlayUrl();
-                + "?random=false&token=" + NetworkTool.NetworkAPI.HTTP_KEY + "&filePath=" + data.getPlayFile();
         try {
             if (mediaPlayer.isPlaying()) {
                 mediaPlayer.stop();
@@ -76,6 +92,10 @@ public class MusicContainer {
         builder.putLong(MediaMetadataCompat.METADATA_KEY_YEAR, Long.parseLong(data.getYear()));
         builder.putLong(MediaMetadataCompat.METADATA_KEY_TRACK_NUMBER, Long.parseLong(data.getTrack()));
         builder.putLong(MediaMetadataCompat.METADATA_KEY_DISC_NUMBER, Long.parseLong(data.getDisc_no()));
+        builder.putLong(MediaMetadataCompat.METADATA_KEY_DURATION,3*60*1000);
+        if(data.getImg()!=null){
+            builder.putBitmap(MediaMetadataCompat.METADATA_KEY_DISPLAY_ICON,data.getImg());
+        }
         return builder.build();
     }
 

app/src/main/java/com/yutou/nas_music_player/containers/MusicData.java

@@ -1,8 +1,13 @@
 package com.yutou.nas_music_player.containers;
 
 
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
 import android.util.Base64;
 
+import com.alibaba.fastjson.JSONObject;
+import com.yutou.nas_music_player.Interfaces.NetworkInterface;
+import com.yutou.nas_music_player.tools.NetworkTool;
 import com.yutou.nas_music_player.tools.StringUtil;
 
 public class MusicData {
@@ -18,6 +23,7 @@ public class MusicData {
     private String lastDir;//上一个文件夹
     private String file;
     private boolean isDir = false;
+    private Bitmap img;
 
     public MusicData() {
     }
@@ -55,8 +61,8 @@ public class MusicData {
     }
 
     public String getYear() {
-        if(StringUtil.isEmpty(year)){
+        if (StringUtil.isEmpty(year)) {
-            year="8888";
+            year = "8888";
         }
         return year;
     }
@@ -66,7 +72,7 @@ public class MusicData {
     }
 
     public String getTrack() {
-        if(StringUtil.isEmpty(track)){
+        if (StringUtil.isEmpty(track)) {
             return "0";
         }
         return track;
@@ -77,7 +83,7 @@ public class MusicData {
     }
 
     public String getDisc_no() {
-        if(StringUtil.isEmpty(disc_no)){
+        if (StringUtil.isEmpty(disc_no)) {
             return "0";
         }
         return disc_no;
@@ -123,10 +129,47 @@ public class MusicData {
     public String getFile() {
         return file;
     }
+
     public void setFile(String file) {
         this.file = file;
     }
-    public String getPlayFile(){
+
-        return new String(Base64.encode(file.getBytes(),Base64.DEFAULT));
+    public String getPlayFileBase64() {
+        return new String(Base64.encode(file.getBytes(), Base64.DEFAULT));
+    }
+
+    public String getPlayUrl() {
+        return NetworkTool.NetworkAPI.HOME + NetworkTool.NetworkAPI.MUSIC_PLAY
+                + "?random=false&token=" + NetworkTool.NetworkAPI.HTTP_KEY + "&filePath=" + getPlayFileBase64();
+    }
+
+    private boolean isDownloadImg = false;
+
+    public Bitmap getImg() {
+        if (img != null) {
+            return img;
+        }
+        if (isDownloadImg) {
+            return null;
+        }
+        isDownloadImg = true;
+        JSONObject json = new JSONObject();
+        json.put("fileName", getPlayFileBase64());
+        NetworkTool.init().httpGet(NetworkTool.NetworkAPI.MUSIC_IMAGE, json, new NetworkInterface() {
+            @Override
+            public void httpGetData(Object data, int state) {
+                JSONObject json = JSONObject.parseObject(data.toString());
+                if (json.getInteger("code") == 0) {
+                    byte[] bytes = json.getBytes("data");
+                    img = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
+                }
+            }
+
+            @Override
+            public void httpError(Exception e) {
+                isDownloadImg = false;
+            }
+        });
+        return img;
     }
 }

app/src/main/java/com/yutou/nas_music_player/services/MusicService.java

@@ -1,9 +1,11 @@
 package com.yutou.nas_music_player.services;
 
+import android.app.Notification;
 import android.app.Service;
 import android.content.Intent;
 import android.os.Bundle;
 import android.os.IBinder;
+import android.os.SystemClock;
 import android.support.v4.media.MediaBrowserCompat;
 import android.support.v4.media.MediaMetadataCompat;
 import android.support.v4.media.session.MediaSessionCompat;
@@ -13,29 +15,41 @@ import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.media.MediaBrowserServiceCompat;
 
+import com.yutou.nas_music_player.containers.MediaNotificationManager;
 import com.yutou.nas_music_player.containers.MusicContainer;
 import com.yutou.nas_music_player.containers.MusicData;
 import com.yutou.nas_music_player.tools.AppData;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Timer;
+import java.util.TimerTask;
 
 public class MusicService extends MediaBrowserServiceCompat {
-    private MediaSessionCompat mediaSession;
+    public MediaSessionCompat mediaSession;
     private PlaybackStateCompat.Builder stateBuilder;
+    private MediaNotificationManager notificationManager;
+    private int mState = PlaybackStateCompat.STATE_PLAYING;
+
+    private static final long MEDIA_SESSION_ACTIONS = PlaybackStateCompat.ACTION_PLAY
+            | PlaybackStateCompat.ACTION_PAUSE
+            | PlaybackStateCompat.ACTION_PLAY_PAUSE
+            | PlaybackStateCompat.ACTION_SKIP_TO_NEXT
+            | PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS
+            | PlaybackStateCompat.ACTION_STOP
+            | PlaybackStateCompat.ACTION_SEEK_TO;
 
     @Override
     public void onCreate() {
         super.onCreate();
+        notificationManager = new MediaNotificationManager(this);
         mediaSession = new MediaSessionCompat(getApplicationContext(), "MEDIA_LOG");
         mediaSession.setFlags(
                 MediaSessionCompat.FLAG_HANDLES_MEDIA_BUTTONS |
                         MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS);
 
         stateBuilder = new PlaybackStateCompat.Builder()
-                .setActions(
+                .setActions(MEDIA_SESSION_ACTIONS);
-                        PlaybackStateCompat.ACTION_PLAY |
-                                PlaybackStateCompat.ACTION_PLAY_PAUSE);
         mediaSession.setPlaybackState(stateBuilder.build());
         mediaSession.setCallback(new MediaSessionCallback());
         setSessionToken(mediaSession.getSessionToken());
@@ -50,10 +64,10 @@ public class MusicService extends MediaBrowserServiceCompat {
     @Override
     public void onLoadChildren(@NonNull String parentId, @NonNull Result<List<MediaBrowserCompat.MediaItem>> result) {
         List<MediaBrowserCompat.MediaItem> mediaItems = new ArrayList<>();
-        MediaMetadataCompat compat=MusicContainer.getInstance().getNowPlayMetadataCompat();
+        MediaMetadataCompat compat = MusicContainer.getInstance().getNowPlayMetadataCompat();
         System.out.println(compat);
-        if(compat!=null){
+        if (compat != null) {
-            MediaBrowserCompat.MediaItem mediaItem=new MediaBrowserCompat.MediaItem(compat.getDescription(), MediaBrowserCompat.MediaItem.FLAG_PLAYABLE);
+            MediaBrowserCompat.MediaItem mediaItem = new MediaBrowserCompat.MediaItem(compat.getDescription(), MediaBrowserCompat.MediaItem.FLAG_PLAYABLE);
             mediaItems.add(mediaItem);
         }
         result.sendResult(mediaItems);
@@ -64,15 +78,77 @@ public class MusicService extends MediaBrowserServiceCompat {
         public void onPlay() {
             super.onPlay();
             System.out.println("接收到播放指令");
-            MediaMetadataCompat metadataCompat=MusicContainer.getInstance().getNowPlayMetadataCompat();
+            MediaMetadataCompat metadataCompat = MusicContainer.getInstance().getNowPlayMetadataCompat();
             mediaSession.setMetadata(metadataCompat);
             mediaSession.setActive(true);
 
+            Notification notification = notificationManager.getNotification(metadataCompat, builderState(0).build(), getSessionToken());
+            startForeground(MediaNotificationManager.NOTIFICATION_ID, notification);
+            new Timer().schedule(new TimerTask() {
+                long position = 0;
+
+                @Override
+                public void run() {
+                    position += 1000;
+                    MusicData data=MusicContainer.getInstance().getNowPlayData();
+                    data.setTitle(position+"");
+                    MediaMetadataCompat metadataCompat = MusicContainer.getInstance().getMetadataCompat(data);
+                    Notification notification = notificationManager.getNotification(metadataCompat, builderState(position).build(), getSessionToken());
+                    notificationManager.getManager()
+                            .notify(MediaNotificationManager.NOTIFICATION_ID, notification);
+                    mediaSession.setPlaybackState(new PlaybackStateCompat.Builder()
+                            .setActions(MEDIA_SESSION_ACTIONS)
+                            .setState(PlaybackStateCompat.STATE_PLAYING,position,1.0f,SystemClock.elapsedRealtime()).build());
+                }
+            }, 0, 1000);
         }
 
         @Override
         public void onPause() {
             super.onPause();
         }
+
+        @Override
+        public void onSeekTo(long pos) {
+            super.onSeekTo(pos);
+        }
+
+        public PlaybackStateCompat.Builder builderState(long position) {
+            PlaybackStateCompat.Builder stateBuilder = new PlaybackStateCompat.Builder();
+            stateBuilder.setActions(getAvailableActions());
+            stateBuilder.setState(mState,
+                    position,
+                    1.0f,
+                    SystemClock.elapsedRealtime());
+            return stateBuilder;
+        }
+
+        private long getAvailableActions() {
+            long actions = PlaybackStateCompat.ACTION_PLAY_FROM_MEDIA_ID
+                    | PlaybackStateCompat.ACTION_PLAY_FROM_SEARCH
+                    | PlaybackStateCompat.ACTION_SKIP_TO_NEXT
+                    | PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS;
+            switch (mState) {
+                case PlaybackStateCompat.STATE_STOPPED:
+                    actions |= PlaybackStateCompat.ACTION_PLAY
+                            | PlaybackStateCompat.ACTION_PAUSE;
+                    break;
+                case PlaybackStateCompat.STATE_PLAYING:
+                    actions |= PlaybackStateCompat.ACTION_STOP
+                            | PlaybackStateCompat.ACTION_PAUSE
+                            | PlaybackStateCompat.ACTION_SEEK_TO;
+                    break;
+                case PlaybackStateCompat.STATE_PAUSED:
+                    actions |= PlaybackStateCompat.ACTION_PLAY
+                            | PlaybackStateCompat.ACTION_STOP;
+                    break;
+                default:
+                    actions |= PlaybackStateCompat.ACTION_PLAY
+                            | PlaybackStateCompat.ACTION_PLAY_PAUSE
+                            | PlaybackStateCompat.ACTION_STOP
+                            | PlaybackStateCompat.ACTION_PAUSE;
+            }
+            return actions;
+        }
     }
 }

app/src/main/java/com/yutou/nas_music_player/views/MainActivity.java

@@ -3,37 +3,80 @@ package com.yutou.nas_music_player.views;
 import androidx.appcompat.app.AppCompatActivity;
 
 import android.os.Bundle;
+import android.support.v4.media.MediaMetadataCompat;
+import android.support.v4.media.session.MediaControllerCompat;
+import android.support.v4.media.session.MediaSessionCompat;
+import android.support.v4.media.session.PlaybackStateCompat;
 import android.view.View;
 import android.widget.ImageButton;
+import android.widget.ImageView;
+import android.widget.MediaController;
 
 import com.yutou.nas_music_player.R;
 import com.yutou.nas_music_player.containers.MediaBrowserHelper;
 import com.yutou.nas_music_player.containers.MusicContainer;
 
+import java.util.List;
+
 public class MainActivity extends AppCompatActivity {
-    private ImageButton play,previous,next;
+    private ImageButton play, previous, next;
     private MediaBrowserHelper browserHelper;
+    private ImageView imageView2;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         MusicContainer.getInstance();
-        play=findViewById(R.id.play);
+        play = findViewById(R.id.play);
-        next=findViewById(R.id.next);
+        next = findViewById(R.id.next);
+        previous = findViewById(R.id.previous);
+        imageView2 = findViewById(R.id.imageView2);
         play.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                browserHelper=new MediaBrowserHelper(MainActivity.this);
+
             }
         });
         next.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                browserHelper.getTransportControls().play();
+
+            }
+        });
+        previous.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+
             }
         });
 
-     //   browserHelper=new MediaBrowserHelper(this);
+        browserHelper = new MediaBrowserHelper(this);
+        browserHelper.regPlayListener(new PlayListener());
+    }
 
+    private class PlayListener extends MediaControllerCompat.Callback {
+        @Override
+        public void onPlaybackStateChanged(PlaybackStateCompat state) {
+            super.onPlaybackStateChanged(state);
+        }
+
+        @Override
+        public void onMetadataChanged(MediaMetadataCompat metadata) {
+            super.onMetadataChanged(metadata);
+            if(metadata!=null){
+                imageView2.setImageBitmap(metadata.getBitmap(MediaMetadataCompat.METADATA_KEY_DISPLAY_ICON));
+            }
+        }
+
+        @Override
+        public void onSessionDestroyed() {
+            super.onSessionDestroyed();
+        }
+
+        @Override
+        public void onQueueChanged(List<MediaSessionCompat.QueueItem> queue) {
+            super.onQueueChanged(queue);
+        }
     }
 }

app/src/main/res/layout/activity_main.xml

@@ -31,10 +31,11 @@
     </FrameLayout>
 
     <LinearLayout
+        android:id="@+id/linearLayout"
         android:layout_width="match_parent"
         android:layout_height="0dp"
-        android:gravity="center"
         android:layout_marginTop="20dp"
+        android:gravity="center"
         android:orientation="horizontal"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
@@ -63,4 +64,25 @@
             android:layout_marginStart="30dp"
             android:src="@android:drawable/ic_media_next" />
     </LinearLayout>
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="100dp"
+        android:orientation="vertical"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/linearLayout">
+
+        <TextView
+            android:id="@+id/title"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="title" />
+
+        <TextView
+            android:id="@+id/artist"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="artist-album" />
+    </LinearLayout>
 </androidx.constraintlayout.widget.ConstraintLayout>