i'm total newbie java programming, app worked flawleslly until now, can't find cause of error. app shuts down when opening instantly(force close). in advance!
logcat:
09-02 01:07:15.932 15469-15469/com.example.yusuf.bluetoothserver i/art: late-enabling -xcheck:jni 09-02 01:07:15.959 15469-15469/com.example.yusuf.bluetoothserver w/system: classloader referenced unknown path: /data/app/com.example.yusuf.bluetoothserver-2/lib/arm 09-02 01:07:16.011 15469-15469/com.example.yusuf.bluetoothserver w/system: classloader referenced unknown path: /data/app/com.example.yusuf.bluetoothserver-2/lib/arm 09-02 01:07:16.046 15469-15469/com.example.yusuf.bluetoothserver w/xposed: package name /data/data/com.example.yusuf.bluetoothserver/files/instant-run/left/resources.ap_ had retrieved via parser 09-02 01:07:16.081 15469-15469/com.example.yusuf.bluetoothserver v/uuid: 52e2e4ec-0541-4e5e-b599-467ee6fec3aa 09-02 01:07:16.084 15469-15469/com.example.yusuf.bluetoothserver d/androidruntime: shutting down vm 09-02 01:07:16.085 15469-15469/com.example.yusuf.bluetoothserver e/androidruntime: fatal exception: main process: com.example.yusuf.bluetoothserver, pid: 15469 theme: themes:{} java.lang.noclassdeffounderror: failed resolution of: landroid/support/v4/content/contextcompat; @ com.example.yusuf.bluetoothserver.mainactivity.requestpermission(mainactivity.java:606) @ com.example.yusuf.bluetoothserver.mainactivity.oncreate(mainactivity.java:122) @ android.app.activity.performcreate(activity.java:7125) @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1108) @ android.app.activitythread.performlaunchactivity(activitythread.java:2415) @ android.app.activitythread.handlelaunchactivity(activitythread.java:2522) @ android.app.activitythread.-wrap11(activitythread.java) @ android.app.activitythread$h.handlemessage(activitythread.java:1363) @ android.os.handler.dispatchmessage(handler.java:102) @ android.os.looper.loop(looper.java:148) @ android.app.activitythread.main(activitythread.java:5475) @ java.lang.reflect.method.invoke(native method) @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:726) @ com.android.internal.os.zygoteinit.main(zygoteinit.java:616) @ de.robv.android.xposed.xposedbridge.main(xposedbridge.java:132) caused by: java.lang.classnotfoundexception: didn't find class "android.support.v4.content.contextcompat" on path: dexpathlist[[dex file "/data/data/com.example.yusuf.bluetoothserver/files/instant-run/dex/slice-slice_9-classes.dex", dex file "/data/data/com.example.yusuf.bluetoothserver/files/instant-run/dex/slice-slice_8-classes.dex", dex file "/data/data/com.example.yusuf.bluetoothserver/files/instant-run/dex/slice-slice_4-classes.dex", dex file "/data/data/com.example.yusuf.bluetoothserver/files/instant-run/dex/slice-internal_impl-23.1.1_97e3b4268259621b3c54683f9e2f54c902b84549-classes.dex"],nativelibrarydirectories=[/data/app/com.example.yusuf.bluetoothserver-2/lib/arm, /vendor/lib, /system/lib]] @ dalvik.system.basedexclassloader.findclass(basedexclassloader.java:56) @ com.android.tools.fd.runtime.incrementalclassloader$delegateclassloader.findclass(incrementalclassloader.java:90) @ java.lang.classloader.loadclass(classloader.java:511) @ java.lang.classloader.loadclass(classloader.java:469) @ com.example.yusuf.bluetoothserver.mainactivity.requestpermission(mainactivity.java:606) @ com.example.yusuf.bluetoothserver.mainactivity.oncreate(mainactivity.java:122) @ android.app.activity.performcreate(activity.java:7125) @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1108) @ android.app.activitythread.performlaunchactivity(activitythread.java:2415) @ android.app.activitythread.handlelaunchactivity(activitythread.java:2522) @ android.app.activitythread.-wrap11(activitythread.java) @ android.app.activitythread$h.handlemessage(activitythread.java:1363) @ android.os.handler.dispatchmessage(handler.java:102) @ android.os.looper.loop(looper.java:148) @ android.app.activitythread.main(activitythread.java:5475) @ java.lang.reflect.method.invoke(native method) @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:726) @ com.android.internal.os.zygoteinit.main(zygoteinit.java:616) @ de.robv.android.xposed.xposedbridge.main(xposedbridge.java:132) suppressed: java.lang.classnotfoundexception: didn't find class "android.support.v4.content.contextcompat" on path: dexpathlist[[zip file "/data/app/com.example.yusuf.bluetoothserver-2/base.apk"],nativelibrarydirectories=[/data/app/com.example.yusuf.bluetoothserver-2/lib/arm, /vendor/lib, /system/lib]] @ dalvik.system.basedexclassloader.findclass(basedexclassloader.java:56) @ java.lang.classloader.loadclass(classloader.java:511) @ java.lang.classloader.loadclass(classloader.java:504) ... 16 more suppressed: java.lang.classnotfoundexception: didn't find class "android.support.v4.content.contextcompat" on path: dexpathlist[[dex file "/data/data/com.example.yusuf.bluetoothserver/files/instant-run/dex/slice-slice_9-classes.dex", dex file "/data/data/com.example.yusuf.bluetoothserver/files/instant-run/dex/slice-slice_8-classes.dex", dex file "/data/data/com.example.yusuf.bluetoothserver/files/instant-run/dex/slice-slice_4-classes.dex", dex file "/data/data/com.example.yusuf.bluetoothserver/files/instant-run/dex/slice-internal_impl-23.1.1_97e3b4268259621b3c54683f9e2f54c902b84549-classes.dex"],nativelibrarydirectories=[/data/app/com.example.yusuf.bluetoothserver-2/lib/arm, /vendor/lib, /system/lib]] @ dalvik.system.basedexclassloader.findclass(basedexclassloader.java:56) @ com.android.tools.fd.runtime.incrementalclassloader$delegateclassloader.findclass(incrementalclassloader.java:90) @ com.android.tools.fd.runtime.incrementalclassloader.findclass(incrementalclassloader.java:62) @ java.lang.classloader.loadclass(classloader.java:511) @ java.lang.classloader.loadclass(classloader.java:504) ... 17 more suppressed: java.lang.classnotfoundexception: android.support.v4.content.contextcompat @ java.lang.class.classforname(native method) code (ugly hell, know):
(i've removed import things, cause of body limit characters won't let me post)
public class mainactivity extends activity { bluetoothadapter bluetoothadapter; listview listview; arrayadapter<string> arrayadapter; static final int permission_req_code = 1; button pairbtn; button discoverbtn; togglebutton discovertoggle; boolean isregistered; boolean btexitsetting; boolean insettings; boolean serverlistening; radiogroup radiogroup; radiobutton receiveradiobtn; radiobutton sendradiobtn; edittext userinputfield; string userinput = ""; string clientmsg; // button receivebtn = (button) findviewbyid(r.id.receivebtn); @targetapi(build.version_codes.jelly_bean_mr2) @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.main_activity); log.v("uuid",string.valueof(uuid.randomuuid())); /* ___ setting bluetooth ___ */ // - bluetoothadapter - bluetoothadapter = bluetoothadapter.getdefaultadapter(); ////bluetoothmanager bluetoothmanager = (bluetoothmanager)getsystemservice(bluetooth_service); ////bluetoothadapter = bluetoothmanager.getadapter(); if (bluetoothadapter == null) { // device not support bluetooth toast nobt_toast = toast.maketext(this,"device not support bluetooth!",toast.length_short); nobt_toast.show(); } // - enable bluetooth - if (!bluetoothadapter.isenabled()) { intent enablebtintent = new intent(bluetoothadapter.action_request_enable); startactivityforresult(enablebtintent, 0); } listview = (listview)findviewbyid(r.id.listview); arrayadapter = new arrayadapter<string>(this,android.r.layout.simple_list_item_1); listview.setadapter(arrayadapter); // * of marshmallow, permissions not considered "normal" (dangerous - may expose user data), must granted user @ runtime. // includes starting bluetooth discovery feature. // request location permission (needed bluetooth) @ runtime: requestpermission(); pairbtn = (button)findviewbyid(r.id.pairbtn); pairbtn.setonclicklistener(new view.onclicklistener() { @override public void onclick(view v) { // ___ finding paired devices ___ // paireddevices(); } }); discovertoggle = (togglebutton)findviewbyid(r.id.discovertoggle); discovertoggle.setoncheckedchangelistener(new compoundbutton.oncheckedchangelistener() { @override public void oncheckedchanged(compoundbutton buttonview, boolean ischecked) { if (ischecked) { discoverdevices(); } else if (!ischecked) { disablediscovery(); } } }); radiogroup = (radiogroup) findviewbyid(r.id.radiogroup); receiveradiobtn = (radiobutton) findviewbyid(r.id.receiveradiobtn); sendradiobtn = (radiobutton) findviewbyid(r.id.sendradiobtn); // userinputfield = (edittext) findviewbyid(r.id.userinputfield); } @override public boolean oncreateoptionsmenu(menu menu) { super.oncreateoptionsmenu(menu); getmenuinflater().inflate(r.menu.menu_main, menu); view view = menu.finditem(r.id.action_connect).getactionview(); switch connect_switch = (switch) view.findviewbyid(r.id.connect_switch); connect_switch.setoncheckedchangelistener(new compoundbutton.oncheckedchangelistener() { @override public void oncheckedchanged(compoundbutton buttonview, boolean ischecked) { acceptthread acceptthread = new acceptthread(); if (ischecked) { log.d("switch", "checked"); acceptthread.start(); } else if (!ischecked) { log.d("switch", "!checked"); acceptthread.closeconnection(); } } }); return true; } @override public boolean onoptionsitemselected(menuitem item) { super.onoptionsitemselected(item); if (item.getitemid() == r.id.action_settings) { intent settingintent = new intent(this, settings.class); startactivity(settingintent); insettings = true; } if (item.getitemid() == r.id.action_exit) { onstop(); finish(); } return true; } @override protected void onresume() { super.onresume(); if (getintent().getextras() != null) { sharedpreferences sharedpref = preferencemanager.getdefaultsharedpreferences(this); btexitsetting = sharedpref.getboolean("pref_key_exit_bluetooth", false); log.v("bundle", string.valueof(btexitsetting)); insettings = false; } } @override protected void onstop() { super.onstop(); log.w("onstop", "invoked!"); disablediscovery(); if (btexitsetting && !insettings) { bluetoothadapter.disable(); } } @override protected void ondestroy() { super.ondestroy(); log.w("ondestroy", "invoked!"); } /* ___ finding paired devices ___ */ private void paireddevices() { // - querying paired devices - final set<bluetoothdevice> paireddevices = bluetoothadapter.getbondeddevices(); // if there paired devices if (paireddevices.size() > 0) { // loop through paired devices (bluetoothdevice device : paireddevices) { // add name , address array adapter show in listview arrayadapter.add(device.getname() + "\n" + device.getaddress()); } } } // - discovering devices - // create broadcastreceiver action_found private final broadcastreceiver broadcastreceiver = new broadcastreceiver() { @override public void onreceive(context context, intent intent) { log.v("onreceive","invoked"); string action = intent.getaction(); // when discovery finds device if (bluetoothdevice.action_found.equals(action)) { log.v("bt devices","found"); // bluetoothdevice object intent bluetoothdevice device = intent.getparcelableextra(bluetoothdevice.extra_device); // add name , address array adapter show in listview arrayadapter.add(device.getname() + "\n" + device.getaddress()); log.e("bt", device.getname() + "\n" + device.getaddress()); arrayadapter.notifydatasetchanged(); } else { log.v("bt devices","!!!found"); } isregistered = true; } }; private void discoverdevices() { // - enabling discoverability - intent discoverableintent = new intent(bluetoothadapter.action_request_discoverable); discoverableintent.putextra(bluetoothadapter.extra_discoverable_duration, 300); startactivity(discoverableintent); // register broadcastreceiver intentfilter filter = new intentfilter(bluetoothdevice.action_found); // * add following actions ensure start of bt dicovery mode. filter.addaction(bluetoothadapter.action_discovery_finished); filter.addaction(bluetoothadapter.action_discovery_started); registerreceiver(broadcastreceiver, filter); // don't forget unregister during ondestroy if (bluetoothadapter != null && bluetoothadapter.isdiscovering()) { bluetoothadapter.canceldiscovery(); } if (bluetoothadapter != null) { log.e("adapter","not null!"); } bluetoothadapter.startdiscovery(); if (bluetoothadapter.isdiscovering()) { log.e("btadapter","discovering!"); } } private void disablediscovery() { bluetoothadapter.canceldiscovery(); if (isregistered) { unregisterreceiver(broadcastreceiver); } } /* ___ accepting client connection. ___*/ private class acceptthread extends thread { private final bluetoothserversocket mmserversocket; connectedthread connectedthread; public acceptthread() { // use temporary object later assigned mmserversocket, // because mmserversocket final bluetoothserversocket tmp = null; try { // my_uuid app's uuid string, used client code string name = "bluetoothserver"; uuid my_uuid = uuid.fromstring("0ae3d869-470e-45d1-b147-a10882fc1bd2"); tmp = bluetoothadapter.listenusingrfcommwithservicerecord(name, my_uuid); log.e("server", "listening"); } catch (ioexception e) { } mmserversocket = tmp; } public void run() { bluetoothsocket socket = null; // keep listening until exception occurs or socket returned while (true) { try { socket = mmserversocket.accept(); log.e("connection","accepted"); } catch (ioexception e) { break; } // if connection accepted if (socket != null) { // work manage connection (in separate thread) connectedthread = new connectedthread(socket); connectedthread.start(); cancel(); } } } /** cancel listening socket, , cause thread finish */ public void cancel() { try { mmserversocket.close(); } catch (ioexception e) { } } public void closeconnection() { if (connectedthread != null) { connectedthread.close(); } } } /* managing connection */ private class connectedthread extends thread { private final bluetoothsocket mmsocket; private final inputstream mminstream; private final outputstream mmoutstream; bufferedreader inputstream; printwriter outputstream; public connectedthread(bluetoothsocket socket) { mmsocket = socket; inputstream tmpin = null; outputstream tmpout = null; // input , output streams, using temp objects because // member streams final try { tmpin = socket.getinputstream(); tmpout = socket.getoutputstream(); inputstream = new bufferedreader(new inputstreamreader(socket.getinputstream())); outputstream = new printwriter(socket.getoutputstream(), true); } catch (ioexception e) { } mminstream = tmpin; mmoutstream = tmpout; } public void run() { radiobutton rb = (radiobutton) findviewbyid(r.id.receiveradiobtn); rb.setonclicklistener(new radiobutton.onclicklistener(){ @override public void onclick(view v) /*{ synchro sync = new synchro(); thread t = new thread(sync); t.start();}*/ { for(int = 0; < 1000; i++) { read(); textview clientmsgtxv = (textview) findviewbyid(r.id.clientmsgtxv); clientmsgtxv.settext(clientmsg); log.i("server msg", clientmsg); } } }); final togglebutton receivebtn = (togglebutton) findviewbyid(r.id.receivebtn); receivebtn.setonclicklistener(new togglebutton.onclicklistener(){ @override public void onclick(view v) { while (true) { try { if (mminstream.available() > 0 ){ read(); textview clientmsgtxv = (textview) findviewbyid(r.id.clientmsgtxv); clientmsgtxv.settext(clientmsg); log.i("server msg", clientmsg); } else systemclock.sleep(100); } catch(ioexception io) { close(); break; } } } }); } private void read() { try { if(inputstream.ready()) { if ((clientmsg = inputstream.readline()) != null || !("".equals(clientmsg))) { } else { clientmsg = "empty"; } log.i("server msg", clientmsg); log.v("inputstream", "read"); } } catch (ioexception e) { e.printstacktrace(); } } private void write() { // ensure user input added output stream - add conditional statement check if userinput variable not null. if (userinput != null) { log.e("user input", userinput); outputstream.println(userinput); log.d("output stream", "written client"); } } /* shutdown connection */ public void close() { try { mmsocket.close(); } catch (ioexception e) { } } } private void requestpermission() { // here, current activity if (contextcompat.checkselfpermission(this, manifest.permission.access_coarse_location) != packagemanager.permission_granted) { activitycompat.requestpermissions(this, new string[]{manifest.permission.access_coarse_location}, permission_req_code); // permission_req_code app-defined int constant. // callback method gets result of request. } } @override public void onrequestpermissionsresult(int requestcode, string permissions[], int[] grantresults) { switch (requestcode) { case permission_req_code: { // if request cancelled, result arrays empty. if (grantresults.length > 0 && grantresults[0] == packagemanager.permission_granted) { // permission granted - bt-related task need do. } else { // permission denied - disable functionality depends on permission. string btpermissiondeniedstr = "sorry, bluetooth communication not possible without granting location permission"; toast.maketext(this,btpermissiondeniedstr,toast.length_long).show(); } return; } } } public void setretotext() { textview clientmsgtxv = (textview) findviewbyid(r.id.clientmsgtxv); clientmsgtxv.settext(clientmsg); log.i("server msg", clientmsg); } }
it seems you're missing support library. can post build.gradle file app module , project?
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