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protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        stop = (Button) findViewById(R.id.stop);        start = (Button) findViewById(R.id.start);        start.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent intent = new Intent(MainActivity.this , MyService.class);                startService(intent); //启动服务            }        });        stop.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent stopIntent = new Intent(MainActivity.this , MyService.class);                stopService(stopIntent); //停止服务            }        });    }

public class MyService extends Service {//需要在manifest文件中注册    //自身调用stopself（）也可以停止服务运行    public MyService() {    }    @Override    public void onCreate() { //第一次服务创建时调用,已经创建了就直接onstartcommand()        super.onCreate();        Log.i("mydate" , "oncreate");    }    @Override    public int onStartCommand(Intent intent, int flags, int startId) { //服务启动时调用        Log.i("mydate" , "onstartcommand");        return super.onStartCommand(intent, flags, startId);    }    @Override    public void onDestroy() { //服务销毁时调用        Log.i("mydate" , "ondestroy");        super.onDestroy();    }    @Override    public IBinder onBind(Intent intent) {        /*// TODO: Return the communication channel to the service.        throw new UnsupportedOperationException("Not yet implemented");*/        return (new MyBinder()); //具体干嘛，做什么 ,如果没有指定干嘛的话就为空    }    class MyBinder extends Binder { //活动指挥服务干嘛,做什么什么，需要这个东西决定具体做什么        public void startDownload(){            Log.i("mydate" , "开始下载");        }        //...    }}

使用onBind()方法

@Override    public IBinder onBind(Intent intent) {        /*// TODO: Return the communication channel to the service.        throw new UnsupportedOperationException("Not yet implemented");*/        return (new MyBinder()); //具体干嘛，做什么 ,如果没有指定干嘛的话就为空    }

public class MainActivity extends AppCompatActivity {    private Button stop;    private Button start;    private MyService.MyBinder myBinder; //指挥服务具体干嘛的    private ServiceConnection connection = new ServiceConnection() { //对开启服务进行包装，使其具体干吗，做什么，什么        @Override        public void onServiceConnected(ComponentName name, IBinder service) {            myBinder = (MyService.MyBinder) service;            myBinder.startDownload(); //具体调用这个方法            //...        }        @Override        public void onServiceDisconnected(ComponentName name) {        }    };    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        stop = (Button) findViewById(R.id.stop);        start = (Button) findViewById(R.id.start);        start.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent intent = new Intent(MainActivity.this , MyService.class);                bindService(intent , connection , BIND_AUTO_CREATE); //绑定服务 指定binder 已经开启了服务，则不在执行这个语句            }        });        stop.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent stopIntent = new Intent(MainActivity.this , MyService.class);                unbindService(connection); //解绑服务            }        });    }}

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