Form validation on Button click in android -

i'm developing android app in login activity has edittext,radiobutton,spinner , button.so when button pressed i've validate form checking whether fields filled else alert message given user.can please me java code. in advance.

 public void onclicklistener(view v) {   name=(edittext)findviewbyid(r.id.edittext1);   years1=(radiobutton)findviewbyid(r.id.radiobutton3);   years2=(radiobutton)findviewbyid(r.id.radiobutton4);   years3=(radiobutton)findviewbyid(r.id.radiobutton5);   manager=(radiobutton)findviewbyid(r.id.radiobutton1);   teamleader=(radiobutton)findviewbyid(r.id.radiobutton2);   rg1=(radiogroup)findviewbyid(r.id.designation);   rg2=(radiogroup)findviewbyid(r.id.years);   button proceed = (button) findviewbyid(r.id.button1);   proceed.setonclicklistener(new view.onclicklistener()   {         @override            public void onclick(view v)          {             if (validationsuccess())              {              }              else if(manager.ischecked())         {             intent managerintent = new intent(getapplicationcontext(), managerquestionnaire1.class); // <----- start "search" activity             startactivityforresult(managerintent, 0);         }             else if(teamleader.ischecked())               {               intent teamleaderintent = new intent(getapplicationcontext(), teamleaderquestionnaire1.class); // <----- start "type entries out" activity               startactivityforresult(teamleaderintent, 0);               }           else {               alertdialog();                }         }   }); }     private boolean validationsuccess() {     if(name.gettext().tostring().equalsignorecase(""))     {     toast.maketext(getapplicationcontext(),"please enter name",0).show();       return false;     }      if(rg1.getcheckedradiobuttonid()<=0)     {        toast.maketext(getapplicationcontext(),"please select designation",0).show();       return false;     }      if(rg2.getcheckedradiobuttonid()<=0)     {         toast.maketext(getapplicationcontext(),"please select experience",0).show();       return false;     }      if(dept.getselecteditemposition()==0)     {         toast.maketext(getapplicationcontext(),"please select depatrment",0).show();       return false;     }     return true; } private void alertdialog()  {      alertdialog.builder alertdialogbuilder = new alertdialog.builder(login.this);         alertdialogbuilder.setmessage("please ensure questions answered").setcancelable(false).setpositivebutton("ok", new dialoginterface.onclicklistener()         {                     public void onclick(dialoginterface dialog, int id)                      {                         dialog.cancel();                     }                 });              alertdialog alert = alertdialogbuilder.create();             alert.show();   } 

use below code:

 mbtnnext.setonclicklistener(new onclicklistener() {                  @override                 public void onclick(view v) {                     if (validationsuccess()) {                              intent mintent = new intent(                                     youractivity.this,                                     newactivity.class);                             } else {                             alertdialog();                         }             });       private boolean validationsuccess(){     if(editusername.gettext().tostring().equalsignorecase("")){     toast.maketext(getapplicationcontext();"please enter name",0).show();       return false;     }      if(radiogroupdesignation.getcheckedradiobuttonid()<=0){        toast.maketext(getapplicationcontext();"please select designation",0).show();       return false;     }      if(radiogroupexp.getcheckedradiobuttonid()<=0){         toast.maketext(getapplicationcontext();"please select experience",0).show();       return false;     }      if(spinner.getselecteditemposition()==0){         toast.maketext(getapplicationcontext();"please select depatrment",0).show();       return false;     }     return true;     }