android - Null pointer Exception in Custom Adapter while set the value for list item -
i want display conditional data in list view when user request or click on button. each list row has 2 value 1 value name , 2nd description. when user press button fire command , fetch information peripheral , match value different condition 1 one, conditions match value put 1 list row value in adapter after conditions check assign adapter list view, display adapter data display in list view.
this code
public class dtcode extends activity { private final static string tag = dtcode.class.getsimplename();
final static string extra_device_address = "device_address"; public string mdeviceaddress; public bluetoothleservice mbluetoothleservice; private boolean mconnected = false; button btnread, btnclear; string receivedata = ""; listview mylist; errorsadapter adapter; arraylist<error> arrayoferrors; error error; listview listerror; //code service; private final serviceconnection mserviceconnection = new serviceconnection() { @override public void onserviceconnected(componentname componentname, ibinder service) { mbluetoothleservice = ((bluetoothleservice.localbinder) service).getservice(); if (!mbluetoothleservice.initialize()){ log.e(tag, "bluetooth not initialize"); finish(); } log.e(tag,"bluetooth service okay"); mbluetoothleservice.connect(mdeviceaddress); } @override public void onservicedisconnected(componentname componentname) { mbluetoothleservice = null; } }; private final broadcastreceiver mgattupdatereceiver= new broadcastreceiver() { @override public void onreceive(context context, intent intent) { final string action = intent.getaction(); if (bluetoothleservice.action_gatt_connected.equals(action)){ log.e(tag, "only gatt, wait"); } else if (bluetoothleservice.action_gatt_disconnected.equals(action)){ mconnected = false; invalidateoptionsmenu(); btnclear.setenabled(false); btnread.setenabled(false); }else if (bluetoothleservice.action_gatt_services_discovered.equals(action)){ mconnected =true; btnread.setenabled(true); log.e(tag,"in need"); }else if (bluetoothleservice.action_data_available.equals(action)){ log.e(tag,"receive data"); string data = intent.getstringextra(bluetoothleservice.extra_data); if (data != null){ btnclear.setenabled(true); receivedata = receivedata.concat(data); char character = receivedata.charat(receivedata.length() - 1 ); system.out.println(receivedata); if (character == '\n'){ string[] err = receivedata.split("!"); (int = 0 ; < err.length ; i++) { string[] errcode = err[i].split("_"); (int j = 0; j < errcode.length; j++) { system.out.println(errcode[j]); if (errcode[j].startswith("108e07")){ error = new error("dim-b108e07", "display failure information"); adapter.add(error); }else if (errcode[j].startswith("115c71")){ error = new error("dim-b115c71", "transfer fuel pump. actuator stuck"); adapter.add(error); }else if (errcode[j].startswith("1a0107")){ error = new error("dim-b1a0107","speaker #1 failure."); adapter.add(error); }else if (errcode[j].startswith("1b6916")){ error = new error("dim-b1b6916","circuit voltage below threshold."); adapter.add(error); }else if (errcode[j].startswith("1b6917")){ error = new error("dim-b1b6917","circuit voltage above threshold"); adapter.add(error); }else if (errcode[j].startswith("1a4815")){ error = new error("dim-c1a4815", "short circuit battery or open."); adapter.add(error); }else if (errcode[j].startswith("600262")){ error = new error("dim-c200262", "odometer tempered"); adapter.add(error); }else if (errcode[j].startswith("046071")){ error = new error("dim-p0460171","fuel level circuit, actuator stuck."); adapter.add(error); }else if (errcode[j].startswith("134671")){ error = new error("dim-p134671","fuel level b circuit, actuator stuck."); adapter.add(error); }else if (errcode[j].startswith("c00155")){ error = new error("dim-u000155","high speed can not configured."); adapter.add(error); }else if (errcode[j].startswith("c00188")){ error = new error("dim-u000188","high speed can bus off."); adapter.add(error); }else if (errcode[j].startswith("c01055")){ error = new error("dim-u001055","medium speed can not configured."); adapter.add(error); }else if (errcode[j].startswith("c01088")){ error = new error("dim-u001088","medium speed can bus off."); adapter.add(error); }else if (errcode[j].startswith("c10000")){ error = new error("dim-u010000","lost communication ecm."); adapter.add(error); }else if (errcode[j].startswith("c10100")){ error = new error("dim-u010100","lost communication tcm."); adapter.add(error); }else if (errcode[j].startswith("c10400")){ error = new error("dim-u010400","lost communication fsm."); adapter.add(error); }else if (errcode[j].startswith("c12100")){ error = new error("dim-u012100","lost communication abs"); adapter.add(error); }else if (errcode[j].startswith("c14000")){ error = new error("dim-u014000","lost communication cem."); adapter.add(error); }else if (errcode[j].startswith("c15100")){ error = new error("dim-u015100","lost communication srsm."); adapter.add(error); }else if (errcode[j].startswith("c15600")){ error = new error("dim-u015600","lost communication icm."); adapter.add(error); }else if (errcode[j].startswith("c15900")){ error = new error("dim-u015900","lost communication pam."); adapter.add(error); }else if (errcode[j].startswith("c25000")){ error = new error("dim-u025000","lost communication ppm."); adapter.add(error); }else if (errcode[j].startswith("c25200")){ error = new error("dim-u025200","lost communication trm."); adapter.add(error); }else if (errcode[j].startswith("c40168")){ error = new error("dim-u040168","invalid data received ecm/pcm."); adapter.add(error); }else if (errcode[j].startswith("c40268")){ error = new error("dim-u040268","invalid data received tcm."); adapter.add(error); }else if (errcode[j].startswith("c41568")){ error = new error("dim-u041568","invalid data received abs."); adapter.add(error); }else if (errcode[j].startswith("c42268")){ error = new error("dim-u042268","invalid data received cem."); adapter.add(error); }else if (errcode[j].startswith("c45292")){ error = new error("dim-u045292","invalid data received srs."); adapter.add(error); }else if (errcode[j].startswith("c55168")){ error = new error("dim-u055168","invalid data received ppm."); adapter.add(error); }else if (errcode[j].startswith("da4b49")){ error = new error("dim-u1a4b49","internal electronic failure."); adapter.add(error); }else if (errcode[j].startswith("e10000")){ error = new error("dim-u210000","control module not configured."); adapter.add(error); }else if (errcode[j].startswith("e10100")){ error = new error("dim-u210100","control module configuration incompatible."); adapter.add(error); }else if (errcode[j].startswith("f00044")){ error = new error("dim-u300044","data memory failure."); adapter.add(error); }else if (errcode[j].startswith("f00045")){ error = new error("dim-u300045","program memory failure."); adapter.add(error); }else if (errcode[j].startswith("f00362")){ error = new error("dim-u300362","signal compare failure."); adapter.add(error); } } } listerror.setadapter(adapter); } } } } }; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_dtcode); final intent intent = getintent(); mdeviceaddress = intent.getstringextra(extra_device_address); btnread = (button) findviewbyid(r.id.read); btnread.setenabled(false); btnclear= (button) findviewbyid(r.id.clr); btnclear.setenabled(false); arrayoferrors = new arraylist<error>(); adapter = new errorsadapter(this, arrayoferrors); listerror = (listview) findviewbyid(r.id.list); getactionbar().settitle("tft trouble code"); getactionbar().setdisplayhomeasupenabled(true); log.d(tag, "try bindservice=" + bindservice(new intent(this, bluetoothleservice.class), mserviceconnection, bind_auto_create)); registerreceiver(mgattupdatereceiver, makegattupdateintentfilter()); } @override protected void onresume(){ super.onresume(); registerreceiver(mgattupdatereceiver,makegattupdateintentfilter()); if (mbluetoothleservice != null){ final boolean result = mbluetoothleservice.connect(mdeviceaddress); log.d(tag,"connect result="+ result); } } @override protected void onpause(){ super.onpause(); unregisterreceiver(mgattupdatereceiver); unbindservice(mserviceconnection); } @override protected void ondestroy(){ if (mbluetoothleservice != null){ mbluetoothleservice.close(); mbluetoothleservice = null; } log.d(tag, "we in destroy"); } public void onclick (view v){ if (v == btnread){ if(!mconnected) return; mbluetoothleservice.writevalue("$dim_re\n"); } if (v == btnclear){ if(!mconnected) return; mbluetoothleservice.writevalue("$dim_clr\n"); mylist.setadapter(null); } } public class errorsadapter extends arrayadapter<error>{ public errorsadapter(context context, arraylist<error> errors){ super(context, 0, errors); } @override public view getview(int position, view convertview, viewgroup parent){ error error = getitem(position); if (convertview == null){ convertview = layoutinflater.from(getcontext()).inflate(r.layout.item_error, parent, false); } textview ectxt = (textview) findviewbyid(r.id.txt_error_code); textview edtxt = (textview) findviewbyid(r.id.txt_error_description); ectxt.settext(error.errorcode); edtxt.settext(error.errordescription); return convertview; } }
in getview in adapter, replace
textview ectxt = (textview) findviewbyid(r.id.txt_error_code); textview edtxt = (textview) findviewbyid(r.id.txt_error_description); with
textview ectxt = (textview) convertview.findviewbyid(r.id.txt_error_code); textview edtxt = (textview) convertview.findviewbyid(r.id.txt_error_description);
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