Using bindservice method to pause music playing

xml

<?xml version="1.0" encoding="utf-8"
?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=" Binding services "
        android:onClick="bangdingfuwu"
        />
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=" stop it "
        android:onClick="tingzhi"/>
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=" Play "
        android:onClick="bofan"/>

</LinearLayout>

java

package com.commerce.mybindservicemusic;

import androidx.appcompat.app.AppCompatActivity;

import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.view.View;

public class MainActivity extends AppCompatActivity {
    private MyServiceConnection myConn;
    private MyService.MyBind myBinder;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void bangdingfuwu(View view) {
        if (myConn==null)
        {
            myConn =new MyServiceConnection();
        }



        Intent service = new Intent(MainActivity.this,MyService.class);

        bindService(service,myConn,BIND_AUTO_CREATE);

    }

    public void tingzhi(View view) {
        myBinder.tingzhi();

    }

    public void bofan(View view) {
    }

    private class MyServiceConnection implements ServiceConnection{


        @Override
        public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
            myBinder=(MyService.MyBind) iBinder;

        }

        @Override
        public void onServiceDisconnected(ComponentName componentName) {

        }
    }
    }
service
package com.commerce.mybindservicemusic;

import android.app.Service;
import android.content.Intent;
import android.content.res.AssetFileDescriptor;
import android.media.AudioManager;
import android.media.MediaParser;
import android.media.MediaPlayer;
import android.os.Binder;
import android.os.IBinder;
import android.widget.Toast;

import java.io.IOException;

public class MyService extends Service {
    private MediaPlayer mp;
    public MyService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        // 
TODO: Return the communication channel to the service.
        Toast.makeText(MyService.this, " Binding service succeeded ", Toast.LENGTH_LONG).show();
        if (mp !=null){
            if (!mp.isPlaying()) {
            } else {
                mp.stop();
            }
            mp.release();

        }
        mp=new MediaPlayer();
        mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
        mp.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
            @Override
            public void onPrepared(MediaPlayer mediaPlayer) {
                mp.start();
            }
        });

        AssetFileDescriptor file =getResources().openRawResourceFd(R.raw.music);
        try{
            mp.setDataSource(file.getFileDescriptor(),file.getStartOffset(),file.getLength());
            file.close();
            mp.prepareAsync();
        }catch (IOException e){
            e.printStackTrace();

        }
        return new MyBind();

    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        return super.onStartCommand(intent, flags, startId);
    }
    public class MyBind extends Binder{
        public void tingzhi(){
            mp.pause();

        }
        public void bofan(){


        }
}
}