I'm writing an sample app to create a Server on Android and a client to connect to PC. I put the serversocket in a thread of a service. Everything goes perfectly, until a few minutes after the screen goes off. This may be Android kill my server, I tried to put a full wake lock to my code and it wont kill anymore, however, I DO want the screen go off as usual. Here is my code:
public class MessageListener extends Service {
private ServerSocket serverSocket;
@Override
public void onCreate() {
Log.v("Test", "Create service");
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
PowerManager.WakeLock wl=null;
PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "My Tag");
wl.acquire();
startServer();
if(wl!=null) wl.release();
return START_STICKY;
}
private Runnable thread = new Runnable() {
@Override
public synchronized void run() {
try {
serverSocket = new ServerSocket(Integer.parseInt(5000));
ObjectInputStream in = null;
while (true) {
Socket client = serverSocket.accept();
Log.v("TCP", "S: Receiving...");
try {
in = new ObjectInputStream(client.getInputStream());
DataInController data = new DataInController(
getApplicationContext());
data.processDataIn(in.readObject(), client);
} catch (ClassNotFoundException e) {
System.out.println("TCP S: Error in PC Server Listener");
e.printStackTrace();
} finally {
client.close();
}
}
} catch (IOException e) {
}
}
};
private Thread serverThread;
private synchronized void startServer() {
if (serverThread == null) {
serverThread = new Thread(thread);
serverThread.start();
}
}
private synchronized void stopServer() {
if(serverThread!=null){
Thread t=serverThread;
serverThread=null;
t.interrupt();
}
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onDestroy() {
super.onDestroy();
Log.v("TCP", "Killing Service!!!!!!!!!!!!!!!!!!!!!!!");
if (serverSocket != null) {
try {
serverSocket.close();
stopServer();
Log.v("TCP", "Closed server socket");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
Two things that worked for us: