android - Add a "Remember me" checkbox -

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i have checkbox button remember user id , password. can please guide me in right direction how started?

i built app, here's basic code , explanation:

basically key here sharedpreferences. you'll setup sharedpreferences object , store username , password after user has entered them. then, when run application again, preferences have data stored , repopulate login fields.

loginactivity.java

package com.realsimpleapps.logintesting;  import android.app.activity; import android.content.context; import android.content.intent; import android.content.sharedpreferences; import android.os.bundle; import android.view.view; import android.view.view.onclicklistener; import android.view.inputmethod.inputmethodmanager; import android.widget.button; import android.widget.checkbox; import android.widget.edittext;  public class loginactivity extends activity implements onclicklistener {      private string username,password;     private button ok;     private edittext edittextusername,edittextpassword;     private checkbox savelogincheckbox;     private sharedpreferences loginpreferences;     private sharedpreferences.editor loginprefseditor;     private boolean savelogin;      @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.login);          ok = (button)findviewbyid(r.id.buttonlogin);         ok.setonclicklistener(this);         edittextusername = (edittext)findviewbyid(r.id.edittextusername);         edittextpassword = (edittext)findviewbyid(r.id.edittextpassword);         savelogincheckbox = (checkbox)findviewbyid(r.id.savelogincheckbox);         loginpreferences = getsharedpreferences("loginprefs", mode_private);         loginprefseditor = loginpreferences.edit();          savelogin = loginpreferences.getboolean("savelogin", false);         if (savelogin == true) {             edittextusername.settext(loginpreferences.getstring("username", ""));             edittextpassword.settext(loginpreferences.getstring("password", ""));             savelogincheckbox.setchecked(true);         }     }      public void onclick(view view) {         if (view == ok) {             inputmethodmanager imm = (inputmethodmanager)getsystemservice(context.input_method_service);             imm.hidesoftinputfromwindow(edittextusername.getwindowtoken(), 0);              username = edittextusername.gettext().tostring();             password = edittextpassword.gettext().tostring();              if (savelogincheckbox.ischecked()) {                 loginprefseditor.putboolean("savelogin", true);                 loginprefseditor.putstring("username", username);                 loginprefseditor.putstring("password", password);                 loginprefseditor.commit();             } else {                 loginprefseditor.clear();                 loginprefseditor.commit();             }              dosomethingelse();         }     }      public void dosomethingelse() {         startactivity(new intent(loginactivity.this, mainactivity.class));         loginactivity.this.finish();     } }

the method @ end, dosomethingelse() placeholder go next step application. dosomethingelse() method loads activity.

here's basic xml file login page:

login.xml

<?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:background="#000"     android:padding="10dp" >      <edittext         android:id="@+id/edittextusername"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:layout_alignparentleft="true"         android:layout_below="@+id/imageview1"         android:hint="username"         android:inputtype="textnosuggestions"         android:imeoptions="actionnext" />      <edittext         android:id="@+id/edittextpassword"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:layout_alignparentleft="true"         android:layout_below="@+id/edittextusername"         android:hint="password"         android:inputtype="textpassword"         android:imeoptions="actiondone" />      <checkbox         android:id="@+id/savelogincheckbox"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:layout_alignparentleft="true"         android:layout_below="@+id/edittextpassword"         android:text="save login?"         android:textcolor="#fff" />      <button         android:id="@+id/buttonlogin"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:layout_alignparentleft="true"         android:layout_below="@+id/savelogincheckbox"         android:layout_margintop="40dp"         android:text="login" />  </relativelayout>

important: you'll want encrypt password before storing in sharedpreferences. details beyond scope of question, here code used that: http://www.androidsnippets.com/encryptdecrypt-strings. you'll have come kind of key schema too.

this code has been tested on android 2.1, sdk 7. let me know how works you.

david


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