java - Make a Login Activity in Android using my own API -

java - Make a Login Activity in Android using my own API -

i've done api , want utilize android. first of want create login , access mainactivity don't know how utilize api check if info introduced in android login right compared 1 i've stored. how can access info i've stored in database through api?

for example, i've method called getuser in api returns user , it's running in local tomcat. i'd access method android through server , user , compare 1 introduced in android login.

for i've next in login activity:

public class loginactivity extends activity { private final static string tag = loginactivity.class.getname(); private button btnlogin; private edittext inputusername; private edittext inputpassword; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.login_layout); inputusername = (edittext) findviewbyid(r.id.etusername); inputpassword = (edittext) findviewbyid(r.id.etpassword); btnlogin = (button) findviewbyid(r.id.blogin); btnlogin.setonclicklistener( new view.onclicklistener() { @override public void onclick(view v) { // todo auto-generated method stub sharedpreferences prefs = getsharedpreferences("mini-profile", context.mode_private); string username = prefs.getstring("username", null); string password = prefs.getstring("password", null); if ((username != null) && (password != null)) { intent intent = new intent(loginactivity.this, minimainactivity.class); startactivity(intent); finish(); } } }); } }

can explain me more or less how it? or know interesting site explained this?

thank you.

you have write asynctask (http://developer.android.com/reference/android/os/asynctask.html) every time want to access api, asyntask has called within onclick, (as asynctask async) wait response in onpostexecute method, , within onpostexecute compare result of api phone call decide whether phone call startactivity(intent); or showing error message (for example). may want show progress in onpreexecute().

you may find many examples of asyntask in google.

java android api login