将MediaPlayer添加到注释栏中

Question

我想在对象被调用时将MediaPlayer对象放到Android的注释栏中。

但是我做的表格不起作用。

它不是齿轮错误，但是不起作用。

我在哪里失败了？

查看代码：

package carcleo.com.player;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.ProgressDialog;
import android.app.TaskStackBuilder;
import android.content.Context;
import android.content.Intent;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.session.MediaSession;
import android.os.AsyncTask;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.support.v4.app.NotificationCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.RemoteViews;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;

import java.io.IOException;

public class player extends AppCompatActivity {

    private MediaPlayer mPlayer;
    private String URL;
    private Button btnPlayPause;
    private Boolean conexao = false;
    private ProgressDialog progressDialog;
    private SeekBar sb;
    private TextView textView;
    private NotificationManager mNotificationManager;

    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.player);

        textView = findViewById(R.id.textView);

        progressDialog = new ProgressDialog(this);

        btnPlayPause = (Button) findViewById(R.id.btnPlayPause);

        btnPlayPause.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                try {
                    if (mPlayer == null) mPlayer = new MediaPlayer();
                    tocaPausa();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });

    }

    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
    private void notificacao (){

        RemoteViews remoteViews = new RemoteViews(this.getPackageName(), R.layout.player);

        NotificationCompat.Builder mBuilder =
                new NotificationCompat.Builder(this)
                        .setSmallIcon(R.drawable.home)
                        .setContentTitle("Rádio Capital")
                        //.setCustomContentView(remoteViews)
                        .setContentText("Agora deu");

        Intent resultIntent = new Intent(this, player.class);
        TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
        stackBuilder.addParentStack(player.class);
        stackBuilder.addNextIntent(resultIntent);
        PendingIntent resultPendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
        mBuilder.setContentIntent(resultPendingIntent);
        mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        mNotificationManager.notify(1, mBuilder.build());

    }

    private void tocaPausa() throws IOException {
        if (conexao == true) {
            if (!mPlayer.isPlaying()) {
                mPlayer.start();
                btnPlayPause.setBackgroundResource(R.drawable.pause);
            } else {
                mPlayer.pause();
                btnPlayPause.setBackgroundResource(R.drawable.play);
            }
        } else {
            String url = "rtsp://cdn-the-2.musicradio.com:80/LiveAudio/Capital"; // your URL here
            new Play().execute(url);
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mNotificationManager.cancelAll(); // <---- não esqueça de destruir o receiver junto com a activity
    }

    class Play extends AsyncTask<String, Boolean, Boolean> {

        @Override
        protected void onPreExecute() {

            progressDialog.setMessage("Carregando...");
            progressDialog.show();

        }

        @Override
        protected Boolean doInBackground(String... params) {

            try {
                mPlayer = new MediaPlayer();
                mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
                mPlayer.setDataSource(params[0]);
                mPlayer.prepare(); // might take long! (for buffering, etc)
                return true;
            } catch (IOException e) {
                e.printStackTrace();
                return false;
            }

        }

        @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
        @Override
        protected void onPostExecute(Boolean result) {

            if (progressDialog.isShowing()) {
                progressDialog.cancel();
            }

            if(result == true){
                conexao = true;
                mPlayer.start();
                btnPlayPause.setBackgroundResource(R.drawable.pause);
            } else {
                conexao = false;
                btnPlayPause.setBackgroundResource(R.drawable.play);
            }

            notificacao();

        }

    }

}

这种形式，它不会像下面那样将MediaPlayer放入注释栏：

在此图中看到它：接下来滚动桌面Android，可以看到在其中写入应用程序的注释栏

Leve Garoa, São Paulo

这正是我想要放置我的播放器的地方。

如何做到？