public class MyService extends Service {
  // 必須實(shí)現(xiàn)，綁定該Service時(shí)被回調(diào)
  @Override
  public IBinder onBind(Intent intent) {
    return null;
  }
  // Service被創(chuàng)建時(shí)回調(diào)
  @Override
  public void onCreate() {
    super.onCreate();
    // 定義相關(guān)業(yè)務(wù)邏輯
    System.out.println("Service is Created");
  }
  // Service被啟動(dòng)時(shí)回調(diào)
  @Override
  public int onStartCommand(Intent intent, int flags, int startId) {
    // 定義相關(guān)業(yè)務(wù)邏輯
    System.out.println("Service is Started");
    return START_STICKY;
  }
  // Service被關(guān)閉之前回調(diào)
  @Override
  public void onDestroy() {
    super.onDestroy();
    System.out.println("Service is Destroyed");
  }
}

<application
  ...
  <!-- 配置一個(gè)Service組件 -->
  <service android:name=".MyService">
    <intent-filter>
      <!-- 為該Service組件的intent-filter配置action -->
      <action android:name="com.gc.service.MY_SERVICE" />
    </intent-filter>
  </service>
</application>

// 創(chuàng)建啟動(dòng)Service的Intent
final Intent intent = new Intent();
// 為Intent設(shè)置Action屬性
intent.setAction("com.gc.service.MY_SERVICE");
...
// 啟動(dòng)指定Serivce
startService(intent);
...
// 停止指定Serivce
stopService(intent);

bindService(Intent intent, ServiceConnection conn, int flags)，三個(gè)參數(shù)如下：

intent：指定要啟動(dòng)的Service

conn：用于監(jiān)聽訪問者與Service之間的連接情況，當(dāng)訪問者與Service之間連接成功時(shí)將回調(diào)該ServiceConnection對(duì)象的onServiceConnected(ComponentName name, IBinder service)方法；反之回調(diào)該ServiceConnection對(duì)象的onServiceDisconnected(ComponentName name)方法（主動(dòng)調(diào)用unbindService方法斷開連接時(shí)則不回調(diào)）

flags：指定綁定時(shí)是否創(chuàng)建Service，0：不自動(dòng)創(chuàng)建；BIND_AUTO_CREATE:自動(dòng)創(chuàng)建

注意：ServiceConnection對(duì)象的onServiceConnected方法中有一個(gè)IBinder對(duì)象，該對(duì)象即可實(shí)現(xiàn)與綁定Service之間的通信。
在綁定本地Service的情況下，onBind(Intent intent)方法所返回的IBinder對(duì)象將會(huì)傳給ServiceConnection對(duì)象里onServiceConnected(ComponentName name, IBinder service)方法的service參數(shù)，這樣訪問者就可以通過該IBinder對(duì)象與Service進(jìn)行通信。

public class MyService extends Service {
  private int count;
  // 定義onBinder方法所返回的對(duì)象
  private MyBinder binder = new MyBinder();

  // 通過繼承Binder來實(shí)現(xiàn)IBinder類
  public class MyBinder extends Binder {
    public int getCount() {
      return count; // 獲取Service的運(yùn)行狀態(tài)
    }
  }
  // 必須實(shí)現(xiàn)，綁定該Service時(shí)被回調(diào)
  @Override
  public IBinder onBind(Intent intent) {
    System.out.println("Service is Binded");
    return binder; // 返回IBinder對(duì)象
  }
  // Service被創(chuàng)建時(shí)回調(diào)
  @Override
  public void onCreate() {
    super.onCreate();
    System.out.println("Service is Created");
    count = 100;
  }
  // Service被斷開連接時(shí)回調(diào)
  @Override
  public boolean onUnbind(Intent intent) {
    System.out.println("Service is Unbinded");
    return true;
  }
  // Service被關(guān)閉之前回調(diào)
  @Override
  public void onDestroy() {
    super.onDestroy();
    System.out.println("Service is Destroyed");
  }
}

public class MyServiceTest extends Activity {
  // Service的IBinder對(duì)象
  MyService.MyBinder binder;

  // 定義一個(gè)ServiceConnection對(duì)象
  private ServiceConnection conn = new ServiceConnection() {
    // 當(dāng)該Activity與Service連接成功時(shí)回調(diào)
    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
      // 獲取Service的onBind方法所返回的MyBinder對(duì)象
      binder = (MyService.MyBinder) service;
    }
    // 當(dāng)該Activity與Service斷開連接時(shí)回調(diào)
    @Override
    public void onServiceDisconnected(ComponentName name) {
    }
  };

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ...
    // 創(chuàng)建啟動(dòng)Service的Intent
    final Intent intent = new Intent();
    // 為Intent設(shè)置Action屬性
    intent.setAction("com.gc.service.MY_SERVICE");
    // 綁定指定Serivce
    bindService(intent, conn, Service.BIND_AUTO_CREATE);
    ...
    binder.getCount(); // 獲取Serivce的count值
    ...   
    // 解除綁定Serivce
    unbindService(conn);
  }
}