Android bluetooth connection with an obd2 -
till app can discover make discoverable , these.when press device's name example of near cellphone(which have opened bluetooth) appears in listview fact want.after when press ,i have classic error << "w/bluetoothadapter: getbluetoothservice() called no bluetoothmanagercallback w/system.err: java.io.ioexception: read failed, socket might closed or timeout, read ret: -1 ">>.it doesnt work bluetoothsocket.connect in code. in other case when go car tablet(which includes app android studio) can search obd2 , when press ,it makes bond requirement.i keying in 1234 password , make bond in tablets bluetooth features can see it.i need have did me next steps.for example how send command rpm or speed , take response.please me!
here code:
public class bluetoothactivity extends appcompatactivity {
private static final string tag ="msg" ; private bluetoothadapter bluetoothadapter; private togglebutton togglebutton; private listview listview; private arrayadapter adapter; private static final int message_read =1; private static final int enable_bt_request_code = 1; private static final int discoverable_bt_request_code = 2; private static final int discoverable_duration = 300; private final static uuid uuid = uuid.fromstring("8ce255c0-200a-11e0-ac64-0800200c9a66"); // create broadcastreceiver action_found private final broadcastreceiver broadcastreceiver = new broadcastreceiver() { public void onreceive(context context, intent intent) { string action = intent.getaction(); // whenever remote bluetooth device found if (bluetoothdevice.action_found.equals(action)) { // bluetoothdevice object intent bluetoothdevice bluetoothdevice = intent.getparcelableextra(bluetoothdevice.extra_device); // add name , address array adapter show in listview adapter.add(bluetoothdevice.getname() + "\n" + bluetoothdevice.getaddress()); adapter.notifydatasetchanged(); } //uuid=bluetoothdevice.getuuids()[0].getuuid(); } }; // intentfilter filter = new intentfilter(bluetoothdevice.action_found);
// registerreceiver(broadcastreceiver, filter) // don't forget unregister during ondestroy
@override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_bluetooth); togglebutton = (togglebutton) findviewbyid(r.id.togglebutton); listview = (listview) findviewbyid(r.id.listview); //listview item click listener listview.setonitemclicklistener(new adapterview.onitemclicklistener() { @override public void onitemclick(adapterview<?> parent, view view, int position, long id) { string itemvalue = (string) listview.getitematposition(position); string mac = itemvalue.substring(itemvalue.length() - 17); bluetoothdevice bluetoothdevice = bluetoothadapter.getremotedevice(mac); // initiate connection request in separate thread connectingthread t = new connectingthread(bluetoothdevice); t.start(); } }); adapter = new arrayadapter (this, android.r.layout.simple_list_item_1); listview.setadapter(adapter); bluetoothadapter = bluetoothadapter.getdefaultadapter(); } //Οταν πατάμε το button για να ανοίξει το bluetooth! public void ontoggleclicked(view view) { adapter.clear(); togglebutton togglebutton = (togglebutton) view; if (bluetoothadapter == null) { // device not support bluetooth toast.maketext(getapplicationcontext(), "Η συσκευή δεν υποστηρίζει bluetooth.", toast.length_short).show(); togglebutton.setchecked(false); } else { if (togglebutton.ischecked()){ // turn on bluetooth if (!bluetoothadapter.isenabled()) { // dialog appear requesting user permission enable bluetooth intent enablebluetoothintent = new intent(bluetoothadapter.action_request_enable); startactivityforresult(enablebluetoothintent, enable_bt_request_code); } else { toast.maketext(getapplicationcontext(), "Η Συσκευή είναι έτοιμη για χρήση." + "\n" + "Ανίχνευση για Απομακρυσμένες Συσκευές...", toast.length_short).show(); // discover remote bluetooth devices discoverdevices(); // make local device discoverable other devices makediscoverable(); } } else { // turn off bluetooth bluetoothadapter.disable(); adapter.clear(); toast.maketext(getapplicationcontext(), "Η συσκευή έχει Απενεργοποιηθεί.", toast.length_short).show(); } } } public void onactivityresult(int requestcode, int resultcode, intent data) { if (requestcode == enable_bt_request_code) { // bluetooth enabled! if (resultcode == activity.result_ok) { toast.maketext(getapplicationcontext(), "Το bluetooth έχει Ενεργοποιηθεί." + "\n" + "Ανίχνευση για Απομακρυσμένες Συσκευές...", toast.length_short).show(); // discover remote bluetooth devices discoverdevices(); // make local device discoverable other devices makediscoverable(); // start thread create server socket listen // connection request listeningthread t = new listeningthread(); t.start(); } else { // result_canceled user refused or failed enable bluetooth toast.maketext(getapplicationcontext(), "Το bluetooth δεν έχει Ενεργοποιηθεί.", toast.length_short).show(); // turn off togglebutton togglebutton.setchecked(false); } } else if (requestcode == discoverable_bt_request_code){ if (resultcode == discoverable_duration){ toast.maketext(getapplicationcontext(), "Η συσκευή είναι τώρα Ανιχνεύσιμη απο άλλες συσκευές.. " + discoverable_duration + " Δευτερόλεπτα", toast.length_short).show(); } else { toast.maketext(getapplicationcontext(), "Αποτυχία να Ενεργοποιηθεί η Ανιχνευσημότητα της Συσκευής.", toast.length_short).show(); } } } protected void discoverdevices(){ // scan remote bluetooth devices if (bluetoothadapter.startdiscovery()) { toast.maketext(getapplicationcontext(), "Ανίχνευση για άλλες Συσκευές bluetooth...", toast.length_short).show(); } else { toast.maketext(getapplicationcontext(), "Η Ανίχνευση Απέτυχε να αρχίσει.", toast.length_short).show(); } } //Συνάρτηση για makediscoverable protected void makediscoverable(){ // make local device discoverable intent discoverableintent = new intent(bluetoothadapter.action_request_discoverable); discoverableintent.putextra(bluetoothadapter.extra_discoverable_duration, discoverable_duration); startactivityforresult(discoverableintent, discoverable_bt_request_code); } @override protected void onresume() { super.onresume(); // register broadcastreceiver action_found intentfilter filter = new intentfilter(bluetoothdevice.action_found); this.registerreceiver(broadcastreceiver, filter); } //on pause xreiastei na bei kwdikas{} @override protected void onpause() { super.onpause(); this.unregisterreceiver(broadcastreceiver); } @override public boolean oncreateoptionsmenu(menu menu) { // inflate menu; adds items action bar if present. getmenuinflater().inflate(r.menu.bluetooth, menu); return true; } @override public boolean onoptionsitemselected(menuitem item) { // handle action bar item clicks here. action bar // automatically handle clicks on home/up button, long int id = item.getitemid(); if (id == r.id.action_settings) { return true; } return super.onoptionsitemselected(item); } //thread gia ton server.. private class listeningthread extends thread { private final bluetoothserversocket bluetoothserversocket; //constructor public listeningthread() { bluetoothserversocket temp = null; try { temp = bluetoothadapter.listenusingrfcommwithservicerecord(getstring(r.string.app_name), uuid); } catch (ioexception e) { e.printstacktrace(); } bluetoothserversocket = temp; } public void run() { bluetoothsocket bluetoothsocket = null; // block while listening until bluetoothsocket returned // or exception occurs log.d(tag, "o kwdikas edw trexei"); while (true) { try { bluetoothsocket = bluetoothserversocket.accept(); } catch (ioexception e) { break; } // if connection accepted if (bluetoothsocket != null) { //!!!!!!!!!!!!!!!! runonuithread(new runnable() { public void run() { toast.maketext(getapplicationcontext(), "Επιτυχής Σύνδεση με την συσκευή.", toast.length_short).show(); } }); connectedthread = new connectedthread(bluetoothsocket); a.start(); try { bluetoothserversocket.close(); } catch (ioexception e) { e.printstacktrace(); } break; } } } public void cancel() { try { bluetoothserversocket.close(); } catch (ioexception e) { e.printstacktrace(); } } } private class connectingthread extends thread{ private final bluetoothsocket bluetoothsocket; private final bluetoothdevice bluetoothdevice ; public connectingthread(bluetoothdevice device){ bluetoothsocket temp = null; bluetoothdevice = device; //get bluetoothsocket connect given bluetoothdevice try{ temp=bluetoothdevice.createinsecurerfcommsockettoservicerecord(uuid); }catch (ioexception e){ e.printstacktrace(); } bluetoothsocket = temp; } public void run() { // cancel discovery slow down connection bluetoothadapter.canceldiscovery(); try { bluetoothsocket.connect(); log.d(tag, "the code running"); // block until succeeds in connecting device // through bluetoothsocket or throws exception // bluetoothsocket.connect(); //isconnected = true; } catch (ioexception connectexception) { connectexception.printstacktrace(); try { //unable connect bluetoothsocket.close(); } catch (ioexception closeexception) { closeexception.printstacktrace(); } } // work manage connection (in separate thread) //manageconnectedsocket(bluetoothsocket); connectedthread t= new connectedthread(bluetoothsocket); t.start(); } // cancel open connection , terminate thread public void cancel() { try { bluetoothsocket.close(); } catch (ioexception e) { e.printstacktrace(); } } } private class connectedthread extends thread { private final bluetoothsocket bluetoothsocket; private final inputstream mminstream; private final outputstream mmoutstream; private android.os.handler mhandler; public connectedthread(bluetoothsocket socket) { bluetoothsocket = socket; inputstream tmpin = null; outputstream tmpout = null; // input , output streams, using temp objects because // member streams final try { tmpin = socket.getinputstream(); tmpout = socket.getoutputstream(); } catch (ioexception e) { } mminstream = tmpin; mmoutstream = tmpout; } public void run() { byte[] buffer = new byte[1024]; // buffer store stream int bytes; // bytes returned read() // keep listening inputstream until exception occurs while (true) { try { // read inputstream bytes = mminstream.read(buffer); // send obtained bytes ui activity mhandler.obtainmessage(message_read, bytes, -1, buffer) .sendtotarget(); } catch (ioexception e) { break; } } // call main activity send data remote device public void write(byte[] bytes) { try { mmoutstream.write(bytes); } catch (ioexception e) { } } // call main activity shutdown connection public void cancel() { try { bluetoothsocket.close(); mminstream.close(); mmoutstream.close(); } catch (ioexception e) { } } public void setmhandler(handler mhandler) { this.mhandler = mhandler; } } }
you have been able pair obdii adapter plugged diagnostic port on vehicle phone, need connect it.
connect device with:
bluetoothadapter btadapter = bluetoothadapter.getdefaultadapter(); bluetoothdevice device = btadapter.getremotedevice(deviceaddress); uuid uuid = uuid.fromstring("00001101-0000-1000-8000-00805f9b34fb"); bluetoothsocket socket = device.createinsecurerfcommsockettoservicerecord(uuid); socket.connect(); once connected device can initialize obdii adapter @ commands, such "at e0" echo off, , "at l0" line-feed off.
you can continuously data vehicle issuing corresponding pid codes: rpm use "01 0c", speed use "01 0d".
more detail , discussion can found @ link:
http://blog.lemberg.co.uk/how-guide-obdii-reader-app-development
here link obd2 starter library can extend , improve specialized needs:
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