如何使用Android中的Intent將信息發送到服務

Question

我創建了一個更新GPS坐標並將它們發送到FireBase Realtime Database 。 該服務在用戶訪問主頁時啟動。 我希望能夠將一個String從一個Activity發送到服務類。問題是我不能調用loginToFirebase()函數內的getIntent()方法。

這是我試過的代碼：

服務類：

 public class TrackerService extends Service {
  private static final String TAG =    TrackerService.class.getSimpleName();


@Override
public IBinder onBind(Intent intent) {
    return null;
}

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

    buildNotification();

    loginToFirebase();

}

private void buildNotification() {
    String stop = "stop";

    registerReceiver(stopReceiver, new IntentFilter(stop));

    PendingIntent broadcastIntent = PendingIntent.getBroadcast(

            this, 0, new Intent(stop), PendingIntent.FLAG_UPDATE_CURRENT);

    // Create the persistent notification

    NotificationCompat.Builder builder = new NotificationCompat.Builder(this)
            .setContentTitle(getString(R.string.app_name))
            .setContentText("Suivi de la position ...")
            .setOngoing(true)
            .setContentIntent(broadcastIntent)
            .setSmallIcon(R.drawable.alert);
    startForeground(1, builder.build());
}

protected BroadcastReceiver stopReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d(TAG, "received stop broadcast");
        // Stop the service when the notification is tapped
        unregisterReceiver(stopReceiver);
        stopSelf();
    }
};

private void loginToFirebase() {

    String password = "myPassword";
    FirebaseAuth.getInstance().signInWithEmailAndPassword(
            email, password).addOnCompleteListener(new OnCompleteListener<AuthResult>(){
        @Override
        public void onComplete(Task<AuthResult> task) {
            if (task.isSuccessful()) {
                Log.d(TAG, "firebase auth success");
                requestLocationUpdates();
            } else {
                Log.d(TAG, "firebase auth failed");
            }
        }
    });
}

private void requestLocationUpdates() {
    LocationRequest request = new LocationRequest();
    request.setInterval(30000);
    request.setFastestInterval(30000);
    request.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    FusedLocationProviderClient client = LocationServices.getFusedLocationProviderClient(this);
    final String path = "locations" + "/" + 123;
    int permission = ContextCompat.checkSelfPermission(this,
            Manifest.permission.ACCESS_FINE_LOCATION);
    if (permission == PackageManager.PERMISSION_GRANTED) {
        client.requestLocationUpdates(request, new LocationCallback() {
            @Override
            public void onLocationResult(LocationResult locationResult) {
                try {
                    DatabaseReference ref = FirebaseDatabase.getInstance().getReference(path);
                    Location location = locationResult.getLastLocation();
                    if (location != null) {
                        Log.d(TAG, "location update " + location);
                        ref.setValue(location);
                    }
                }catch (Exception e){

                }
            }
        }, null);
    }
}

}

我正在調用服務的方法（在活動中）：

  private void startTrackerService() {
    Intent goService= new Intent(AccueilEtudiant.this,TrackerService.class);
    goService.putExtra("email",getIntent().getStringExtra("email"));
    startService(goService);

}

有什么建議？

Answer 1

我建議你使用持久性。 在您的服務中使用您從sharedPreferences獲得的數據，並在您的活動中，不斷更新sharedPreferences

gps info got updated => persist to storage =>在服務中使用持久的gps信息

服務必須在發送數據之前從所選存儲中讀取數據。