radio button - RadioButton - Checked if radiobutton is checked inside a radiogroup - Android -

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i'm having problem checking if 1 of radiobutton selected inside inside radiogroup, i've tried lot of methods if(rg.getcheckedradiobuttonid() == -1) still not working on code. on logcat string selectedanstext = selectedans.gettext().tostring(); in line logcat pointing problem, can me. tried .ischecked not working. in advanced

bt.setonclicklistener(new view.onclicklistener() {     @override     public void onclick(view v) {           radiobutton selectedans = (radiobutton) findviewbyid(rg.getcheckedradiobuttonid());          string selectedanstext = selectedans.gettext().tostring();           if(rg.getcheckedradiobuttonid()== -1){              toast.maketext(grade_four_post_test.this,                             "choose answer",                             toast.length_long).show();          }else { //do }

ps: bt declared properly

01-28 22:27:07.390 27612-27612/com.example.computer.mathkiddofinal:second w/system.err:     @ android.view.view.performclick(view.java:4463) 01-28 22:27:07.391 27612-27612/com.example.computer.mathkiddofinal:second w/system.err:     @ android.view.view$performclick.run(view.java:18770) 01-28 22:27:07.391 27612-27612/com.example.computer.mathkiddofinal:second w/system.err:     @ android.os.handler.handlecallback(handler.java:808) 01-28 22:27:07.391 27612-27612/com.example.computer.mathkiddofinal:second w/system.err:     @ android.os.handler.dispatchmessage(handler.java:103) 01-28 22:27:07.392 27612-27612/com.example.computer.mathkiddofinal:second w/system.err:     @ android.os.looper.loop(looper.java:193) 01-28 22:27:07.392 27612-27612/com.example.computer.mathkiddofinal:second w/system.err:     @ android.app.activitythread.main(activitythread.java:5292) 01-28 22:27:07.392 27612-27612/com.example.computer.mathkiddofinal:second w/system.err:     @ java.lang.reflect.method.invokenative(native method) 01-28 22:27:07.393 27612-27612/com.example.computer.mathkiddofinal:second w/system.err:     @ java.lang.reflect.method.invoke(method.java:515) 01-28 22:27:07.393 27612-27612/com.example.computer.mathkiddofinal:second w/system.err:     @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:828) 01-28 22:27:07.393 27612-27612/com.example.computer.mathkiddofinal:second w/system.err:     @ com.android.internal.os.zygoteinit.main(zygoteinit.java:644) 01-28 22:27:07.394 27612-27612/com.example.computer.mathkiddofinal:second w/system.err:     @ dalvik.system.nativestart.main(native method) 01-28 22:27:07.394 27612-27612/com.example.computer.mathkiddofinal:second w/dalvikvm: threadid=1: calling uncaughtexceptionhandler 01-28 22:27:07.396 27612-27612/com.example.computer.mathkiddofinal:second e/androidruntime: fatal exception: main                                                                                             process: com.example.computer.mathkiddofinal:second, pid: 27612                                                                                             java.lang.nullpointerexception                                                                                                 @ com.example.computer.mathkiddofinal.grade_level.post_test.grade_four_post_test$1.onclick(grade_four_post_test.java:117)                                                                                                 @ android.view.view.performclick(view.java:4463)                                                                                                 @ android.view.view$performclick.run(view.java:18770)                                                                                                 @ android.os.handler.handlecallback(handler.java:808)                                                                                                 @ android.os.handler.dispatchmessage(handler.java:103)                                                                                                 @ android.os.looper.loop(looper.java:193)                                                                                                 @ android.app.activitythread.main(activitythread.java:5292)                                                                                                 @ java.lang.reflect.method.invokenative(native method)                                                                                                 @ java.lang.reflect.method.invoke(method.java:515)                                                                                                 @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:828)                                                                                                 @ com.android.internal.os.zygoteinit.main(zygoteinit.java:644)                                                                                                 @ dalvik.system.nativestart.main(native method) 01-28 22:27:07.400 696-9034/system_process v/provider/settings:  settings cache , name = dropbox:data_app_crash , value = null 01-28 22:27:07.401 696-9034/system_process d/dalvikvm: create interp thread : stack size=128kb 01-28 22:27:07.401 696-9034/system_process d/dalvikvm: create new thread 01-28 22:27:07.401 696-9034/system_process d/dalvikvm: new thread created 01-28 22:27:07.401 696-9034/system_process d/dalvikvm: update thread list 01-28 22:27:07.402 696-28496/system_process d/dalvikvm: threadid=79: interp stack @ 0x63b53000 01-28 22:27:07.402 696-28496/system_process d/dalvikvm: threadid=79: created interp 01-28 22:27:07.402 696-9034/system_process d/dalvikvm: start new thread 01-28 22:27:07.402 696-9034/system_process v/provider/settings:  settings cache , name = send_action_app_error , value = 1 01-28 22:27:07.402 696-28496/system_process d/dalvikvm: threadid=79: notify debugger 01-28 22:27:07.403 696-9034/system_process w/activitymanager:   force finishing activity com.example.computer.mathkiddofinal/.grade_level.post_test.grade_four_post_test

you nullpointerexception this:

  radiobutton selectedans = (radiobutton) findviewbyid(rg.getcheckedradiobuttonid());          string selectedanstext = selectedans.gettext().tostring();//nullpointer

because if no radiobutton selected, findviewbyid not work, radiobutton not initialized. should this:

 int radiobuttonid = rg.getcheckedradiobuttonid();  if(radiobuttonid!=-1){     //do stuff     radiobutton selectedans = (radiobutton) findviewbyid(radiobuttonid);     string selectedanstext = selectedans.gettext().tostring();  }else{  toast.maketext(grade_four_post_test.this,                             "choose answer",                             toast.length_long).show(); }

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