Databases
StackOverflow2013
Postsdbo
POAndroid Activity does not receive messages from IntentService using BroadcastReceiver
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POAndroid Activity does not receive messages from IntentService using BroadcastReceiver
    primarykey
    data
    text
    <p>I am trying to develop an android app to measure QoS of networks. The app sends UDP packets to a UDP server running on my system. Since this is a long running process, I have implemented the UDP connection in a class which extends IntentService.The reason behind using IntentService is that I need to pass some parameters to the Service. I have a BroadcastReceiver in my activity which listens for messages from the IntentService and prints it. My problem is that although the IntentService is running smoothly, but the activity is not receiving the messages from it. I am new to android development, so please excuse my lack of understanding and any guidance/suggestions will be deeply appreciated. I am posting some parts of my code below. The Logcat does not show any errors. I have seen <strong>intent.setAction()</strong> method being used in some examples, but I am not very clear about how to use it in my case.</p> <p>The BroadcastReceiver (defined within my Activity class)</p> <pre><code>public class UdpResponseReceiver extends BroadcastReceiver { public static final String ACTION_RESP = "com.example.udpmessageclient.intent.action.MESSAGE_PROCESSED"; @Override public void onReceive(Context context, Intent intent) { System.out.println(UdpService.PARAM_OUT_MSG); } </code></pre> <p>I have registered the receiver:</p> <pre><code>IntentFilter filter = new IntentFilter(UdpResponseReceiver.ACTION_RESP); filter.addCategory(Intent.CATEGORY_DEFAULT); receiver = new UdpResponseReceiver(); registerReceiver(receiver, filter); </code></pre> <p>IntentService class:</p> <pre><code>public class UdpService extends IntentService { //..variable declarations public UdpService() { // TODO Auto-generated constructor stub super("UdpService"); } @Override protected void onHandleIntent(Intent intent) { // TODO Auto-generated method stub host = intent.getStringExtra("host"); port = intent.getIntExtra("port", 4000); pType= intent.getIntExtra("pType", 0); delay = intent.getIntExtra("delay", 0); msg= intent.getStringExtra("msg"); broadcastIntent = new Intent(); broadcastIntent.addCategory(Intent.CATEGORY_DEFAULT); broadcastIntent.addFlags(Intent.FLAG_INCLUDE_STOPPED_PACKAGES); try { addr = InetAddress.getByName(host); // addr=InetAddress.getLocalHost(); socket = new DatagramSocket(); // socket.connect(addr,port); System.out.println("\nSocket Connected"); } catch (Exception e) { System.out.println("\nConnection failed"); return; } send=true; switch (pType) { case 0: while (send) { sendPacket(msg); } case 1: while (send) { try { Thread.currentThread().sleep(delay); } catch (Exception e) { } sendPacket(msg); } case 2: while (send) { int u = want(30); String data1 = ""; while ((u--) &gt; 0) data1 = data1 + msg; sendPacket(data1); } case 3: while (send) { int u = want(30); System.out.println(u); String data1 = ""; while ((u--) &gt; 0) data1 = data1 + msg; System.out.println("data length :" + data1.length()); try { Thread.currentThread().sleep(delay); } catch (Exception e) { } sendPacket(data1); } } } public void onDestroy(){ super.onDestroy(); send=false; socket.close(); socket=null; } void sendPacket(String text) { try { System.out.println("\nClient:: Sending packet: " + " to " + addr + port); byte[] data = text.getBytes(); spacket = new DatagramPacket(data, data.length, addr, port); socket.send(spacket); String resultTxt="Sent Packet at:"+DateFormat.format("MM/dd/yy h:mmaa", System.currentTimeMillis()); // this is where I am trying to send message back to the activity broadcastIntent.putExtra(PARAM_OUT_MSG, resultTxt); sendBroadcast(broadcastIntent); } catch (Exception e) { System.out.println("Error:" + e.getMessage()); e.printStackTrace(); return; } } </code></pre> <p>}</p> <p>logcat error messages when the service is stopped:</p> <pre><code>01-14 15:53:41.446: W/System.err(1176): java.lang.NullPointerException 01-14 15:53:41.456: W/System.err(1176): at com.example.udpmessageclient.UdpService.sendPacket(UdpService.java:123) 01-14 15:53:41.466: W/System.err(1176): at com.example.udpmessageclient.UdpService.onHandleIntent(UdpService.java:74) 01-14 15:53:41.466: W/System.err(1176): at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:65) 01-14 15:53:41.466: W/System.err(1176): at android.os.Handler.dispatchMessage(Handler.java:99) 01-14 15:53:41.466: W/System.err(1176): at android.os.Looper.loop(Looper.java:137) 01-14 15:53:41.476: W/System.err(1176): at android.os.HandlerThread.run(HandlerThread.java:60) </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USPoonam Anthony
    1. USPoonam Anthony
    plurals
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COwhere did you register your receiver? If not do it..... register it on onCreate() and unRegister it on onDestroy().
      singulars
      1. POAndroid Activity does not receive messages from IntentService using BroadcastReceiver
      1. USPankaj Kumar
    2. COI have registered it within my Activity class. I have edited my post and added the codes.Please check
      singulars
      1. POAndroid Activity does not receive messages from IntentService using BroadcastReceiver
      1. USPoonam Anthony
    3. COSee my answer.. if any confusion share
      singulars
      1. POAndroid Activity does not receive messages from IntentService using BroadcastReceiver
      1. USPankaj Kumar
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload