音乐播放器 android studio

xml

java

package com.commerce.mymusic;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompatActivity {

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

    public void bofangyinyue(View view) {

      Intent intent = new Intent(MainActivity.this,Mymusic.class);

       startService(intent);
   }
}
service
package com.commerce.mymusic;

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

import java.io.IOException;

public class Mymusic extends Service {

    private MediaPlayer mp;


 
Service    private MediaPlayer mp;    public Mymusic() {
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        Toast.makeText(Mymusic.this,"音乐播放器的服务启动了",Toast.LENGTH_LONG).show();

        if (mp !=null){
            if (mp.isPlaying()){
                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 super.onStartCommand(intent, flags, startId);
    }

    @Override
    public IBinder onBind(Intent intent) {
        
//        throw new UnsupportedOperationException("Not yet implemented");
    }
}