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

-



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.





wiki

Comments

Post a Comment

Popular posts from this blog

Asterisk AGI Python Script to Dialplan does not work -

-
i'm stuck project have check database of sip extension incoming caller id , dial sip extension. below receive when run script on asterisk cli. -- registered sip '9125' @ 192.168.1.102:50142 > saved useragent "zoiper rv2.8.40" peer 9125 [2017-08-22 13:53:33] notice[5095]: chan_sip.c:24558 handle_response_peerpoke: peer '9125' reachable. (17ms / 2000ms) == using sip rtp tos bits 184 == using sip rtp cos mark 5 -- executing [0112617769@from-trunk:1] answer("sip/obitrunk1-0000000d", "") in new stack > 0x1ca50d0 -- probation passed - setting rtp source address 192.168.1.98:16834 -- executing [0112617769@from-trunk:2] agi("sip/obitrunk1-0000000d", "test.py") in new stack -- launched agi script /var/lib/asterisk/agi-bin/test.py args: ['/var/lib/asterisk/agi-bin/test.py'] env line: agi_request: test.py env line: agi_channel: sip/obitrunk1-0000000d env line: agi_language: en env line: a
Read more

python - Read npy file directly from S3 StreamingBody -

-
i have many .npy (numpy) , .json files saved in s3, need download , load these files. for json files downloading files , loading dictionary using following code: obj = s3.object(bucket, key) response = obj.get() body = response['body'].read().decode('utf-8') data = json.loads(body) that way avoid writing .json file disk , reading it. now want same .npy files, equivalent? currently downloading file, saving temp file on disk , loading np.load avoid if possible. following https://stackoverflow.com/a/28196540/3509999 : obj = s3.object(bucket, key) io.bytesio(obj.get()["body"].read()) f: # rewind file f.seek(0) arr = np.load(f) wiki
Read more

kotlin - Out-projected type in generic interface prohibits the use of metod with generic parameter -

-
i start using kotlin , defined interface this: interface aadapter<vh : recyclerview.viewholder> { fun oncreateaviewholder(parent: viewgroup): vh fun onbindaviewholder(v: vh, position: int) } and when try use on code: class klasa ( private val adapter: aadapter<*> ) { fun dosth(){ //... val vh = this.adapter.oncreateaviewholder(parent) //on below line error adapter.onbindaviewholder(v, position) //... } } i error out-projected type 'aadapter<*>' prohibits use of 'public abstract fun onbindaviewholder(v: t, position: int): unit i tied add "in" or "out" definition i'm confused. how allow it. replace aadapter<*> aadapter<recyclerview.viewholder> . class klasa ( private val adapter: aadapter<recyclerview.viewholder> ) { // ... because have declared aadapter has type parameter vh type subclass of recyclerview.
Read more