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Comment puis-je accéder aux variables de niveau classe à l'intérieur du thread, j'ai essayé d'accéder à la variable directement mais l'exception se produit. Est-il possible d'accéder à la variable de niveau classe à l'intérieur du thread ou je dois utiliser handler?Accès à la variable de niveau Classe dans le thread
Voici mon code.
public class MainMapActivity extends MapActivity
{
//***************************************************************************************
//isRouteDisplayed Method (Override)
@Override
protected boolean isRouteDisplayed()
{
return false;
}//End method
//***************************************************************************************
//private Handler handlerTimer = new Handler();
//***************************************************************************************
//Class Level Variables & Objects
String[] Device_ID = null;
//***************************************************************************************
//onCreate method (Override the built-in method) Called when the activity is first created.
@Override
public void onCreate(Bundle savedInstanceState)
{
//handlerTimer.removeCallbacks(taskUpdateStuffOnDialog);
//handlerTimer.postDelayed(taskUpdateStuffOnDialog , 100);
//service = new NewService();
new Thread(taskUpdateStuffOnDialog).start();
// GIve the Server some time for startup
try
{
Thread.sleep(500);
}
catch (InterruptedException e)
{
}
// Kickoff the Client
// startService(new Intent(this, NewService.class));
new Thread(new NewService()).start();
}//End onCreate
//***************************************************************************************
private Runnable taskUpdateStuffOnDialog = new Runnable()
{
public void run()
{
GlobalVariable appState = ((GlobalVariable)getApplicationContext());
try
{
serverAddr = InetAddress.getByName(SERVERIP);
Log.d("UDP", "S: Connecting...");
/* Create new UDP-Socket */
socket = new DatagramSocket(SERVERPORT, serverAddr);
}
catch (Exception e)
{
Log.e("UDP", "S: Error", e);
}
while(true)
{
// TODO Auto-generated method stub
try
{
/* Retrieve the ServerName */
/* By magic we know, how much data will be waiting for us */
byte[] buf = new byte[72];
/* Prepare a UDP-Packet that can
* contain the data we want to receive */
DatagramPacket packet = new DatagramPacket(buf, buf.length);
Log.d("UDP", "S: Receiving...");
/* Receive the UDP-Packet */
socket.receive(packet);
String id = new String(packet.getData());
//buffer.order(ByteOrder.LITTLE_ENDIAN); // if you want little-endian
String[] tokens = id.split(" ");
String b = tokens[0];
Log.d("Message: ", b + " " );
/***************************** sending device ID *************************************/
else if(b.equals("5"))
{
Device_ID[0] = tokens[1];
runOnUiThread(new Runnable()
{
public void run()
{
String id = tokens[1];
Log.d("UDP", "S: Received Device ID: '" + id + "'");
setID(id);
//positionOverlay.setID(id);
//addEvent(id);
Toast.makeText(MainMapActivity.this, "Your Device ID " + id,Toast.LENGTH_LONG).show();
}
});
//Toast.makeText(MainMapActivity.this, "Your Device ID " + b,Toast.LENGTH_LONG).show();
} // end else if
} // end try
catch (Exception e)
{
Log.e("UDP", "S: Error", e);
} // end catch
//handlerTimer.postDelayed(this, 100);
} // end while condition
//***************************************************************************************
}//End Run method
//***************************************************************************************
};//End Thread
//***************************************************************************************
}
Une exception est l'exception du pointeur nul à Device_ID[0] = tokens[1]; cette ligne.
" l'exception se produit "ne nous donne aucune information utile. Veuillez lire http://tinyurl.com/so-hints et éditez votre question en conséquence. –
L'extrait de code n'indique pas où les jetons sont déclarés, uniquement là où ils sont initialisés. – shelley