Android使用本地Service实现后台播放音乐

 <service android:name=".MyService"></service>

  <Button
        android:id="@+id/btn_open"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />

源码

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {

    private Button btn_open;
    private boolean status=false;
    Intent intent;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        intent=new Intent(this,MyService.class);
        btn_open= (Button) findViewById(R.id.btn_open);
        btn_open.setText("open ");
        btn_open.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(!status){
                    btn_open.setText("close");
                    startService(intent);//调用onCreate的方法
                    status=true;
                }else{
                    btn_open.setText("open");
                    stopService(intent);//调用onDestory方法
                    status=false;
                }
            }
        });
    }
}

Service:

import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.util.Log;

public class MyService extends Service {
    MediaPlayer mediaPlayer;

    //必须要实现此方法，IBinder对象用于交换数据，此处暂时不实现
    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        mediaPlayer =MediaPlayer.create(this,R.raw.citylights);
        Log.e("TAG","create");

    }
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        play();
        Log.e("TAG","start");
        return super.onStartCommand(intent, flags, startId);
    }

    //封装播放
    private void play() {
        mediaPlayer.start();
    }

    //service被关闭之前调用
    @Override
    public void onDestroy() {
        super.onDestroy();
        mediaPlayer.stop();
        Log.e("TAG","destoryed");
    }
}