java - Android App storing and calling Username and Passwords -


i have application want create log in activity. ive got 1) login (button) 2) userid (edittext) 3) password (edittext)

i store username , password on device's internal storage. how create file sharedpreferences pulls , encrypt it? 

login_button.setonclicklistener(new view.onclicklistener(){          @override         public void onclick(view v) {              sharedpreferences userdetails = getsharedpreferences("userdetails", mode_private);             sharedpreferences.editor edit = userdetails.edit();             edit.clear();              if(etuserid.gettext().tostring().equals("")){                 toast.maketext(getapplicationcontext(),"please enter user id", toast.length_long).show();             }else if (etpassword.gettext().tostring().equals("")){                 toast.maketext(getapplicationcontext(),"please enter password", toast.length_long).show();             }else{                 edit.putstring("userid", txtuid.gettext().tostring().trim());                 edit.putstring("password", txtpass.gettext().tostring().trim());                 edit.commit();             }            }     });

the txtuid , txtpass showing red , when delete system says gettext wrong.

this first shot @ authenticator. found called passwordauthentication android dev page haven't been able find tutorials or code of being used. 

sharedpreferences userdetails = getsharedpreferences("userdetails", mode_private);     string uid = userdetails.getstring("userid", "");     string pass = userdetails.getstring("password", "");      if (userdetails.contains("userid")||userdetails.contains("password")){         startactivity(new intent(logon.this,crimemap.class));     }

sources ive used research: http://developer.android.com/reference/java/net/passwordauthentication.html how use getsharedpreferences in android

update:

ok, here updated code. if don't enter user id or password sets off statements. however, program doesn't go next activity when put in correct userid , password. i'm going running first , ill move on encrypting it.

@override protected void oncreate(bundle savedinstancestate){ super.oncreate(savedinstancestate); setcontentview(r.layout.activity_log_on);

    etuserid = (edittext) findviewbyid(r.id.etuserid);     etpassword = (edittext) findviewbyid(r.id.etpassword);     login_button = (button) findviewbyid(r.id.blogin);       login_button.setonclicklistener(new view.onclicklistener(){           @override         public void onclick(view v) {              int uid = 1155;             string pass = "pass";              sharedpreferences userdetails = getsharedpreferences(user_file, mode_private);             sharedpreferences.editor edit = userdetails.edit();              edit.putint("userid", uid);             edit.putstring("password", pass);             edit.commit();               if((etuserid.gettext().tostring().equals("")) || (etpassword.gettext().tostring().equals(""))) {                 toast.maketext(getapplicationcontext(),"please enter user id", toast.length_long).show();             }else if (etpassword.gettext().tostring().equals("")){                 toast.maketext(getapplicationcontext(),"please enter password", toast.length_long).show();             }else{                 edit.putint("userid", integer.parseint(etuserid.gettext().tostring()));                 edit.putstring("password", etpassword.gettext().tostring());             }            }     });      sharedpreferences userdetails = getsharedpreferences(user_file, mode_private);      if (userdetails.equals(etuserid) && (userdetails.equals(etpassword))){         startactivity(new intent(logon.this,crimemap.class));     }

update:

i got it! help! here complete code portion of project. still haven't encrypted think i'm going take break , come later. help!

     @override         public void onclick(view v) {              int uid = 1155;             string pass = "pass";              sharedpreferences userdetails = getsharedpreferences(user_file, mode_private);             sharedpreferences.editor edit = userdetails.edit();              edit.putint("userid", uid);             edit.putstring("password", pass);             edit.commit();               if((etuserid.gettext().tostring().equals(""))){                 toast.maketext(getapplicationcontext(),"please enter user id", toast.length_long).show();             }else if (etpassword.gettext().tostring().equals("")){                 toast.maketext(getapplicationcontext(),"please enter password", toast.length_long).show();             }else{                 string user_id = etuserid.gettext().tostring();                 int user_id2 = integer.parseint(user_id);                 string user_password = etpassword.gettext().tostring();                  int userid = userdetails.getint("userid", 1);                 string password = userdetails.getstring("password", "no name");                  if (userid == user_id2 && password.equals(user_password)){                     startactivity(new intent(logon.this,crimemap.class));                 }             }

don't try access file. let android that, , encrypt data store shared preferences. mean:

  edit.putstring("userid", encrypt(txtuid.gettext().tostring().trim()));   edit.putstring("password", encrypt(txtpass.gettext().tostring().trim()));

you can use whatever encryption like, though of course you'll need decode way.

another option store sha1 encrypted password, , in authentication compare sha1 encypted password typed in stored string. use http://mvnrepository.com/artifact/commons-codec/commons-codec example:

string sha1password = digestutils.sha1hex(password); edit.putstring("sha1password", encrypt(sha1password);

to fix "red" problem you'll need declare txtuid, txtpass. should added layout somehow. via editing layout xml. programmatically can do, like: input text dialog android


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