How to keep state of RadioButton in Android? -

hi i'm trying develop application runs every interval time, lets every 1 minute display toast message.

but problem i'm using radiobutton functionality perfect when tap on 1 radio button green, when close , re-open activity i'll none of radio buttons selected.

here mainactivity.java

public class mainactivity extends activity {  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main); }  public void onradiobuttonclicked(view view) {     // button checked?     boolean checked = ((radiobutton) view).ischecked();      // check radio button clicked     switch(view.getid()) {         case r.id.radio_one_min:             if (checked)             {                 //some code             }             break;         case r.id.radio_ten_min:             if (checked)             {                 //some code             }               break;          case r.id.radio_disable:             if (checked)             {                 //some code             }               break;        } } } 

and here activity_main.xml

<?xml version="1.0" encoding="utf-8"?> <radiogroup xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical" android:id="@+id/radio"> <radiobutton android:id="@+id/radio_disable"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:text="disable"     android:onclick="onradiobuttonclicked"/> <radiobutton android:id="@+id/radio_one_min"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:text="1 minute"     android:onclick="onradiobuttonclicked"/> <radiobutton android:id="@+id/radio_ten_min"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:text="10 minute"     android:onclick="onradiobuttonclicked"/> </radiogroup> 

please me solve riddle.

thanks in advance...

this code useful store ratingbar state, when start new activity, see previous rating state..

package com.example.ratingbar;  import android.os.bundle; import android.preference.preferencemanager; import android.app.activity; import android.content.sharedpreferences; import android.view.menu; import android.view.view; import android.widget.button; import android.widget.ratingbar; import android.widget.ratingbar.onratingbarchangelistener; import android.widget.textview; import android.widget.toast;  public class ratingbarmainactivity extends activity {  ratingbar ratingbarclick; button sub_btn; textview textratingview , textratingviewsave; boolean val = true; float ans = (float) 0.0; //-------------------------------------------------------------------------------------------- @override public void oncreate(bundle savedinstancestate) {      super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_ratingbar_main);      ratingbarclick = (ratingbar) findviewbyid(r.id.ratingbar1);     ratingbarclick.setonratingbarchangelistener(rateobj);       sharedpreferences sharepref = preferencemanager.getdefaultsharedpreferences              (ratingbarmainactivity.this);      ans = sharepref.getfloat("get_rating", 0.0f);     system.out.println("--------------------------------------ans = " + ans);     if(val) {         ratingbarclick.setrating(ans);     }     else {         ratingbarclick.setrating(ans);     }      textratingview = (textview) findviewbyid(r.id.ratingview);   }  //-------------------------------------------------------------------------------------------- //--------------------------------------------------------------------------------------------      ratingbar.onratingbarchangelistener rateobj = new ratingbar.onratingbarchangelistener() {          @override         public void onratingchanged(ratingbar ratingbar, float rating,boolean fromuser) {              //textratingview.settext(string.valueof(rating));             ans = ratingbarclick.getrating();              sharedpreferences sharepref = preferencemanager.getdefaultsharedpreferences                             (ratingbarmainactivity.this);             sharedpreferences.editor edit = sharepref.edit();             edit.putfloat("get_rating", ans);             edit.commit();             val = false;          }     };   //--------------------------------------------------------------------------------------------      }  ---------------------------------------------------------------------------------------------------     activity_ratingbar_main.xml file   <relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" >  <textview     android:id="@+id/textview2"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_alignleft="@+id/ratingbar1"     android:layout_alignparenttop="true"     android:layout_marginleft="15dp"     android:layout_margintop="23dp"     android:text="select rating bar here"     tools:context=".ratingbarmainactivity" />  <ratingbar     android:id="@+id/ratingbar1"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_alignparentleft="true"     android:layout_alignparenttop="true"     android:layout_marginleft="21dp"     android:layout_margintop="63dp" />   <textview     android:id="@+id/ratingview"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_below="@+id/ratingbar1"     android:text="textview" />  <button     android:id="@+id/button1"     style="?android:attr/buttonstylesmall"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_alignparentleft="true"     android:layout_centervertical="true"     android:text="click save rating in textbox" />   </relativelayout>