In addition to the posts at
http://groups.google.com/group/android-developers/browse_thread/thread/47a310494882eb5a/622000c1d630690f
I'm posting a new topic as the other one seems to be closed for
further discussion.
OK so I'm receiving traffic messages via UDP and processing them in a
new thread that is started in a service. I want to stop the thread
when the home or back buttons are pressed as I assume that the user is
then definitely closing the application (there is only one Activity).
With the current code the thread just doesn't stop - it looks to me as
if the service's onDestory() method is never called:
********************** ReceiveThread (irrelevant code is omitted in
each class)
public class ReceiveThread extends Thread {
private volatile boolean isAlive;
private ClientService clientService;
public ReceiveThread(ClientService service) {
clientService = service;
isAlive = true;
}
public void run() {
InetAddress RTIserver;
try {
RTIserver = InetAddress.getByName(host);
DatagramSocket socket = new DatagramSocket();
byte[] buf = new byte[256];
DatagramPacket packet = new DatagramPacket(buf,
buf.length,
RTIserver, port);
BinaryMessage binaryMsg = null;
// say hello to RTI server
ByteString hello = new ByteString(COCAR_HELLO);
packet.setData( hello.getBytes());
socket.send(packet);
// receive traffic data while this thread is alive
while(isAlive) {
packet = new DatagramPacket(new byte[256], 256);
socket.receive(packet);
System.err.println("received packet!");
byte[] bytes = packet.getData();
binaryMsg = BinaryMessage.parseRequest(bytes);
clientService.receiveMessage(binaryMsg);
}
System.err.println("while loop stopped");
socket.close();
} catch ...
}
}
public void kill() {
isAlive = false;
}
}
************************** ClientService
public class ClientService extends Service {
private final String COCAR_POST = "COCAR POST";
private ReceiveThread receiveThread;
@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onCreate() {
super.onCreate();
receiveThread = new ReceiveThread(this);
// debug
Toast.makeText(this, "CoCar Client service created",
Toast.LENGTH_LONG).show();
}
@Override
public void onStart(Intent intent, int startId) {
super.onStart(intent, startId);
receiveThread.start();
Toast.makeText(this, "CoCar Client service started, receiving
traffic events", Toast.LENGTH_LONG).show();
}
@Override
public void onDestroy() {
super.onDestroy();
receiveThread.kill();
System.err.println("sent kill to receive thread");
Toast.makeText(this, "CoCar Client service stopped, not
receiving
traffic events", Toast.LENGTH_LONG).show();
}
// receives a binary message from the receive thread and acts
accordingly
public void receiveMessage(BinaryMessage binaryMsg) {
if(
(binaryMsg.getCocarDirective().getText().toUpperCase().equals
(COCAR_POST))
||
binaryMsg.getCocarDirective().substring(0,10).getText().toUpperCase
().equals(COCAR_POST)) {
createTrafficMessage(binaryMsg);
// TODO: add new message to overlay, update map
etc
}
}
// creates a traffic message from a binary one
private TrafficMessage createTrafficMessage(BinaryMessage binaryMsg)
{
TrafficMessage trafficMsg = new TrafficMessage(binaryMsg);
// debug
trafficMsg.printToLog();
return trafficMsg;
}
}
*************************** Activity
public class HelloMapView extends MapActivity implements
OnClickListener {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initMap();
initLocationManager();
createAndShowTrafficMessage();
cocarClient = startService(new Intent(this,
ClientService.class));
}
@Override
public void onPause() {
super.onPause();
locManager.removeUpdates(locListener);
}
@Override
// use case: if someone is calling and hangs up, after we get back to
our activity,
// gps won't be sending the new signals as the locationListener is
still removed
public void onResume() {
super.onResume();
locManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
0,
0, locListener);
}
@Override
public void onDestroy() {
super.onDestroy();
stopService(new Intent(this, cocarClient.getClass()));
System.err.println("stopped service!");
}
}
Mark Murphy instructed me to use Log instead of Toast, will fix that.
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