<service android:exported="false" android:name="cooperation.wifi.WiFiAutoJumpService">
    <intent-filter>
        <action android:name="com.example.msf.wifi.autoconnect"/>
        <category android:name="android.intent.category.DEFAULT"/>
    </intent-filter>
</service>

public class HelloService extends Service {
  private Looper mServiceLooper;
  private ServiceHandler mServiceHandler;

  // Handler that receives messages from the thread
  private final class ServiceHandler extends Handler {
      public ServiceHandler(Looper looper) {
          super(looper);
      }
      @Override
      public void handleMessage(Message msg) {
          // Normally we would do some work here, like download a file.
          // For our sample, we just sleep for 5 seconds.
          try {
              Thread.sleep(5000);
          } catch (InterruptedException e) {
              // Restore interrupt status.
              Thread.currentThread().interrupt();
          }
          // Stop the service using the startId, so that we don't stop
          // the service in the middle of handling another job
          stopSelf(msg.arg1);
      }
  }

  @Override
  public void onCreate() {
    // Start up the thread running the service.  Note that we create a
    // separate thread because the service normally runs in the process's
    // main thread, which we don't want to block.  We also make it
    // background priority so CPU-intensive work will not disrupt our UI.
    HandlerThread thread = new HandlerThread("ServiceStartArguments",
            Process.THREAD_PRIORITY_BACKGROUND);
    thread.start();

    // Get the HandlerThread's Looper and use it for our Handler
    mServiceLooper = thread.getLooper();
    mServiceHandler = new ServiceHandler(mServiceLooper);
  }

  @Override
  public int onStartCommand(Intent intent, int flags, int startId) {
      Toast.makeText(this, "service starting", Toast.LENGTH_SHORT).show();

      // For each start request, send a message to start a job and deliver the
      // start ID so we know which request we're stopping when we finish the job
      Message msg = mServiceHandler.obtainMessage();
      msg.arg1 = startId;
      mServiceHandler.sendMessage(msg);

      // If we get killed, after returning from here, restart
      return START_STICKY;
  }

  @Override
  public IBinder onBind(Intent intent) {
      // We don't provide binding, so return null
      return null;
  }

  @Override
  public void onDestroy() {
    Toast.makeText(this, "service done", Toast.LENGTH_SHORT).show();
  }
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    Toast.makeText(this, "service starting", Toast.LENGTH_SHORT).show();
    return super.onStartCommand(intent,flags,startId);
}

Notification notification = new Notification(R.drawable.icon, getText(R.string.ticker_text),
        System.currentTimeMillis());
Intent notificationIntent = new Intent(this, ExampleActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
notification.setLatestEventInfo(this, getText(R.string.notification_title),
        getText(R.string.notification_message), pendingIntent);
startForeground(ONGOING_NOTIFICATION_ID, notification);

Intent i = MyService.newIntent(context);
PendingIntent pi = PendingIntent
        .getService(context, 0, i, PendingIntent.FLAG_NO_CREATE); // 如果系统中不存在相同的 PendingIntent，不创建一个新的
return pi != null;

// Service 部分
public static final String ACTION_SHOW_NOTIFICATION = "com.bignerdranch.android.photogallery.SHOW_NOTIFICATION";
public static final String PERM_PRIVATE = "com.bignerdranch.android.photogallery.PRIVATE";

Resources r = getResources();
PendingIntent pi = PendingIntent.getActivity(this, 0, new Intent(this, PhotoGalleryActivity.class), 0);

Notification notification = new NotificationCompat.Builder(this)
        .setTicker(r.getString(R.string.new_picture_title))
        .setSmallIcon(android.R.drawable.ic_menu_report_image)
        .setContentTitle(r.getString(R.string.new_picture_title))
        .setContentText(r.getString(R.string.new_pictures_text))
        .setContentIntent(pi)
        .setAutoCancel(true)
        .build();

Intent i = new Intent(ACTION_SHOW_NOTIFICATION);
i.putExtra("REQUEST_CODE", requestCode);
i.putExtra("NOTIFICATION", notification);

sendOrderedBroadcast(i, PERM_PRIVATE, null, null, Activity.RESULT_OK, null, null);

// 广播接收器
public class NotificationReceiver extends BroadcastReceiver {
    private static final String TAG = "NotificationReceiver";

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.i(TAG, "received result: " + getResultCode());
        if (getResultCode() != Activity.RESULT_OK) {
            return;
        }

        int requestCode = intent.getIntExtra("REQUEST_CODE", 0);
        Notification notification = (Notification) intent.getParcelableExtra("NOTIFICATION");

        NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.notify(requestCode, notification);
    }
}

public class Downloader extends IntentService {
  public static final String ACTION_COMPLETE=
      "com.commonsware.android.downloader.action.COMPLETE";

  public Downloader() {
    super("Downloader");
  }

  @Override
  public void onHandleIntent(Intent i) {
    // ...
    LocalBroadcastManager.getInstance(this)
                           .sendBroadcast(new Intent(ACTION_COMPLETE));
  }

public class DownloadFragment extends Fragment implements
    View.OnClickListener {

  // other is hide ...

  @Override
  public void onResume() {
    super.onResume();

    IntentFilter f = new IntentFilter(Downloader.ACTION_COMPLETE);
    LocalBroadcastManager.getInstance(getActivity())
                         .registerReceiver(onEvent, f);
  }

  @Override
  public void onPause() {
    LocalBroadcastManager.getInstance(getActivity())
                         .unregisterReceiver(onEvent);

    super.onPause();
  }

  @Override
  public void onClick(View v) {
    // ...
    Intent i = new Intent(getActivity(), Downloader.class);
    i.setData(Uri.parse("https://commonsware.com/Android/excerpt.pdf"));
    getActivity().startService(i);
  }

  private BroadcastReceiver onEvent=new BroadcastReceiver() {
    public void onReceive(Context ctxt, Intent i) {
      // ...
    }
  };
}