Android_ client Logic of landing

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Login instance Client processing logic: loginactivity

Package Com.amaker.wlo;import Android.app.activity;import Android.app.alertdialog;import Android.content.dialoginterface;import Android.content.intent;import Android.content.sharedpreferences;import Android.os.bundle;import Android.view.view;import Android.view.view.onclicklistener;import Android.view.Window; Import Android.widget.button;import Android.widget.edittext;import Com.amaker.util.httputil;import Com.amaker.util.loginencryption;public class Loginactivity extends Activity {/** * Login interface * @author SHICHENGWU *///DECLARE login button PR Ivate Button loginbtn;//declares user name, password input box private EditText useredittext,pwdedittext; @Overridepublic void OnCreate (Bundle Savedinstancestate) {super.oncreate (savedinstancestate); Endallactivity.getinstance (). addactivity (this);//For aesthetics, do not set the title requestwindowfeature (window.feature_no_title);// Set the current Activity interface layout Setcontentview (r.layout.activity_login);//Instantiate the component loginbtn = (Button) Findviewbyid by means of the Findviewbyid method ( R.id.login);//Instantiate a component Useredittext = (EditText) Findviewbyid (R.I) by means of the Findviewbyid methodD.useredittext);//Instantiate the component Pwdedittext = (EditText) Findviewbyid (R.id.pwdedittext) by means of the Findviewbyid method; Loginbtn.setonclicklistener (New Onclicklistener () {@Overridepublic void OnClick (View v) {///Login if (Validate ()) {if (login ()) {Intent Intent = new Intent (loginactivity.this,mainmenuactivity.class); startactivity (Intent); Finish ();} Else{showdialog ("User name or password is wrong, please re-enter!")        "); }  }  }     });} Logon Method private Boolean login () {//Get user name string username = Useredittext.gettext (). toString ();//Get Password// MD5 compared to the database after encryption string pwd = Loginencryption.string2md5 (Pwdedittext.gettext (). toString ());//Get login result string result= Query (USERNAME,PWD), if (Result!=null&&result.equals ("0")) {return false;} Else{saveusermsg (result); return true;}}  Save user information to config file private void saveusermsg (String msg) {//user number string id = "";//user name String name = "";//Get information array string[] msgs = Msg.split (";"); int idx = msgs[0].indexof ("="); id = msgs[0].substring (idx+1); idx = msgs[1].indexof ("="); name = Msgs[1].substring (idx+1) ;//share information sharedpreferences pre = GetSHaredpreferences ("User_msg", mode_world_writeable); Sharedpreferences.editor Editor = Pre.edit (); Editor.putstring ("id", id); editor.putstring ("name", name); Editor.commit ();} Authentication Method Private Boolean validate () {String username = Useredittext.gettext (). toString (); if (Username.equals ("")) { ShowDialog ("User name is required!") "); return false;} String pwd = Pwdedittext.gettext (). toString (); if (Pwd.equals (")) {showDialog (" User password is required!) "); return false;} return true;} private void ShowDialog (String msg) {Alertdialog.builder Builder = new Alertdialog.builder (this); Builder.setmessage ( msg). Setcancelable (False). Setpositivebutton ("OK", new Dialoginterface.onclicklistener () {public V OID OnClick (dialoginterface dialog, int id) {}}); Alertdialog alert = Builder.create (); Alert.show ();} Querying private string query based on user name password (string username,string password) {//query parameter string queryString = "Username=" +username+ "& amp;password= "+password;//urlstring url = httputil.base_url+" Servlet/loginservlet? " +querystring;//query Returns the result return Httputil.querystringforpost (URL); }}

In this case, you may not understand the client and server interactions, the next one will talk about the JDBC model involved and the server processing logic of the login instance.

Android_ client Logic of landing