java - Waiting for a callback method to be called in Android -

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i writing android application interacts sensor using bluetooth , obtains temperature values. doing calling connectgatt() asynchronous , calls callback once connection established. problem facing code has wait until connection gets established.

this implementation of method being used in code below.

public boolean connect(final string address) {     log.v(log_tag,"in connect method"+thread.currentthread().getname());     if(btadapter == null || address == null)     {         log.v(log_tag,"unable bluetooth adapter or address not valid");         return false;     }     if(address != null && address.equals(btaddress) && btgatt != null)     {         log.v(log_tag,"trying connect bt gatt profile directly");         boolean result = btgatt.connect();         if(result)             return true;         return false;     }     btdevice = btadapter.getremotedevice(address);     if(btdevice == null)     {         log.v(log_tag,"could not find device.");         return false;     }     btgatt = btdevice.connectgatt(this,false,btgattcallback);     log.v(log_tag,btgatt.tostring());     btaddress = address;     log.v(log_tag,"connecting device");     btconnectionstate = state_connecting;     return true; }

currently solve problem writing following code in handler thread don't want block ui thread while waiting callback. not convinced approach.

        if(mlocation != null)         {             connect(btaddress);   // method encapsulates calls connectgatt method.             while (btconnectionstate != state_connected) {                 continue;             }             while (!services_discovered) {                 continue;             }             //other code

i feel there better ways of solving couldn't find on web. saw couple of answers using countdownlatch , semaphores didn't understand them clearly.

can me understanding how handle situations these? thank you.





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