How to always listen to SMS android
android, broadcastreceiver, service, sms
Solution
Register your `BroadcastReceiver` in the manifest, using a `<receiver>` element, instead of using `registerReceiver()`.
Note that:
You still will not get all SMS messages, as SMS broadcasts are ordered, and some receiver with higher priority than yours can abort the broadcast
Your receiver will not work when first installed on a device, until the user launches an activity of yours, or something else explicitly runs one of your components
Also, note that Android 4.4 significantly overhauled how the SMS process works, so keep that in mind.
Problem
Basically, I'm trying to make an app that always listens to new `SMS`. The point is, i have made a Receiver that will auto-start at device boot, and it can also listen for new SMS, but only if the app is opened, if i close it, then it doesn't work anymore. Here is my Service calling a BroadCastReceiver: ``` public class ServiceCommunicator extends Service { private SMSReceiver mSMSreceiver; private IntentFilter mIntentFilter; private boolean receiverAlive = false; @Override public void onCreate(){ super.onCreate(); //SMS event receiver mSMSreceiver = new SMSReceiver(); mIntentFilter = new IntentFilter(); mIntentFilter.addAction("android.provider.Telephony.SMS_RECEIVED"); registerReceiver(mSMSreceiver, mIntentFilter); } public class SMSReceiver extends BroadcastReceiver { public SmsMessage messages[] = null; private void showNotification(Context context, String sms) { PendingIntent contentIntent = PendingIntent.getActivity(context, 0, new Intent(context, MainActivity.class), 0); NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(context) .setSmallIcon(R.drawable.ic_launcher) .setContentTitle("My notification") .setContentText(sms); mBuilder.setContentIntent(contentIntent); NotificationManager mNotificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE); mNotificationManager.notify(1, mBuilder.build()); } @Override public void onReceive(Context context, Intent intent) { // TODO Auto-generated method stub try { if (intent.getAction().equals("android.provider.Telephony.SMS_RECEIVED")) { Bundle bundle = intent.getExtras(); messages = null; if (bundle != null) { Object[] pdus = (Object[]) bundle.get("pdus"); String sms = ""; String mobile = "34821049283"; for (int i = 0; i < pdus.length; i++) { SmsMessage tmp = SmsMessage.createFromPdu((byte[]) pdus[i]); String senderMobile = tmp.getOriginatingAddress(); if (senderMobile.equals(mobile)) { sms = tmp.getMessageBody(); showNotification(context, sms); break; } } } } } catch (Exception e) { Log.d("Exception caught", e.getMessage()); } receiverAlive = false; mSMSreceiver = new SMSReceiver(); mIntentFilter = new IntentFilter(); mIntentFilter.addAction("android.provider.Telephony.SMS_RECEIVED"); registerReceiver(mSMSreceiver, mIntentFilter); } } ``` And here is my MainClass ``` public class MainActivity extends Activity { private static SmsMessage[] messages = null; public static Activity mActivity = null; public static String mobile = ""; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } @Override protected void onStart(){ super.onStart(); mActivity = this; mobile = ((EditText) findViewById(R.id.txtMobile)).getText().toString(); Intent intent = new Intent(this, ServiceCommunicator.class); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); startService(intent); } } ```