Android getting value from selected radiobutton

Question

I have a piece of code with three RadioButtons within a RadioGroup  I want to set an onCheckedListener that will show the value of the RadioButton in a Toast  However what I have gotten so far is not working  How do I get the value of the RadioButton and display it in a Toast  This is my code   import android os Bundle  import android app Activity  import android view Menu  import android view View  import android widget RadioButton  import android widget RadioGroup  import android widget RadioGroup OnCheckedChangeListener  import android widget Toast   public class MainActivity extends Activity        RadioGroup rg        Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main            RadioGroup rg    RadioGroup  findViewById R id radioGroup1           final String value                 RadioButton findViewById rg getCheckedRadioButtonId                  getText   toString             rg setOnCheckedChangeListener new OnCheckedChangeListener                 public void onCheckedChanged RadioGroup group  int checkedId                    Toast makeText getBaseContext    value  Toast LENGTH SHORT  show                                        XML file    lt 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      android paddingBottom   dimen activity vertical margin      android paddingLeft   dimen activity horizontal margin      android paddingRight   dimen activity horizontal margin      android paddingTop   dimen activity vertical margin      tools context   MainActivity   gt        lt RadioGroup         android id    id radioGroup1          android layout width  wrap content          android layout height  wrap content          android layout alignParentTop  true          android layout centerHorizontal  true          android layout marginTop  152dp   gt            lt RadioButton             android id    id radio0              android layout width  wrap content              android layout height  wrap content              android text  Choose 1    gt             lt RadioButton             android id    id radio1              android layout width  wrap content              android layout height  wrap content              android text  Choose 2    gt             lt RadioButton             android id    id radio2              android layout width  wrap content              android layout height  wrap content              android text  Choose 3    gt        lt  RadioGroup gt    lt  RelativeLayout gt

User · Answer

For anyone who is populating programmatically and looking to get an index, you might notice that the checkedId changes as you return to the activity/fragment and you re-add those radio buttons. One way to get around that is to set a tag with the index:

    for(int i = 0; i < myNames.length; i++) {
        rB = new RadioButton(getContext());
        rB.setText(myNames[i]);
        rB.setTag(i);
        myRadioGroup.addView(rB,i);
    }

Then in your listener:

    myRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            RadioButton radioButton = (RadioButton) group.findViewById(checkedId);
            int mySelectedIndex = (int) radioButton.getTag();
        }
    });

User · Answer

mRadioGroup setOnCheckedChangeListener new RadioGroup OnCheckedChangeListener          Override     public void onCheckedChanged RadioGroup group   IdRes int checkedId            RadioButton radioButton    RadioButton group findViewById checkedId

User · Answer

RadioGroup in XML   lt  xml version  1 0  encoding  utf-8   gt   lt RelativeLayout xmlns android  http   schemas android com apk res android      android layout width  match parent  android layout height  match parent  gt   lt RadioGroup     android layout width  match parent      android layout height  wrap content      android orientation  vertical  gt       lt RadioButton         android layout width  wrap content          android layout height  wrap content          android text  Java   gt        lt  RadioGroup gt   lt  RelativeLayout gt    activity main xml   lt  xml version  1 0  encoding  utf-8   gt   lt RelativeLayout xmlns android  http   schemas android com apk res android      android layout width  match parent  android layout height  match parent  gt       lt TextView         android layout width  wrap content          android layout height  wrap content          android layout marginTop  150dp          android layout marginLeft  100dp          android textSize  18dp          android text  Select Your Course          android textStyle  bold          android id    id txtView   gt   lt RadioGroup     android layout width  match parent      android layout height  wrap content      android orientation  vertical      android id    id rdGroup      android layout below    id txtView  gt       lt RadioButton         android id    id rdbJava          android layout width  wrap content          android layout height  wrap content          android padding  10dp          android layout marginLeft  100dp          android text  Java          android onClick  onRadioButtonClicked   gt       lt RadioButton         android id    id rdbPython          android layout width  wrap content          android layout height  wrap content          android padding  10dp          android layout marginLeft  100dp          android text  Python          android onClick  onRadioButtonClicked   gt       lt RadioButton         android id    id rdbAndroid          android layout width  wrap content          android layout height  wrap content          android padding  10dp          android layout marginLeft  100dp          android text  Android          android onClick  onRadioButtonClicked   gt       lt RadioButton         android id    id rdbAngular          android layout width  wrap content          android layout height  wrap content          android padding  10dp          android layout marginLeft  100dp          android text  AngularJS          android onClick  onRadioButtonClicked   gt   lt  RadioGroup gt       lt Button         android id    id getBtn          android layout width  wrap content          android layout height  wrap content          android layout marginLeft  100dp          android layout below    id rdGroup          android text  Get Course    gt   lt  RelativeLayout gt    MainActivity java  import android support v7 app AppCompatActivity  import android os Bundle  import android view View  import android widget Button  import android widget RadioButton  import android widget Toast   public class MainActivity extends AppCompatActivity       RadioButton android  java  angular  python       Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main           android    RadioButton findViewById R id rdbAndroid           angular    RadioButton findViewById R id rdbAngular           java    RadioButton findViewById R id rdbJava           python    RadioButton findViewById R id rdbPython           Button btn    Button findViewById R id getBtn           btn setOnClickListener new View OnClickListener                  Override             public void onClick View v                    String result    Selected Course                     result    android isChecked     Android   angular isChecked     AngularJS   java isChecked     Java   python isChecked     Python                      Toast makeText getApplicationContext    result  Toast LENGTH SHORT  show                                        public void onRadioButtonClicked View view            boolean checked     RadioButton  view  isChecked            String str                Check which radio button was clicked         switch view getId                  case R id rdbAndroid                  if checked                  str    Android Selected                   break              case R id rdbAngular                  if checked                  str    AngularJS Selected                   break              case R id rdbJava                  if checked                  str    Java Selected                   break              case R id rdbPython                  if checked                  str    Python Selected                   break                    Toast makeText getApplicationContext    str  Toast LENGTH SHORT  show

User · Answer

I have had problems getting radio buttons id s as well when the RadioButtons are dynamically generated   It does not seem to work if you try to manually set the ID s using RadioButton setId     What worked for me was to use View getChildAt   and View getParent   in order to iterate through the radio buttons and determine which one was checked   All you need is to first get the RadioGroup via findViewById R id myRadioGroup  and then iterate through it s children   You ll know as you iterate through which button you are on  and you can simply use RadioButton isChecked   to determine if that is the button that was checked

User · Answer

In case  if you want to do some job on the selection of one of the radio buttons  without having any additional OK button or something   your code is fine  updated little   public class MainActivity extends Activity         Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main            RadioGroup rg    RadioGroup  findViewById R id radioGroup1            rg setOnCheckedChangeListener new RadioGroup OnCheckedChangeListener                          public void onCheckedChanged RadioGroup group  int checkedId                    switch checkedId                       case R id radio0                             do operations specific to this selection                         break                      case R id radio1                             do operations specific to this selection                         break                      case R id radio2                             do operations specific to this selection                         break

User · Answer

radioGroup setOnCheckedChangeListener new RadioGroup OnCheckedChangeListener             Override        public void onCheckedChanged RadioGroup group  int checkedId                      radioButton    RadioButton  findViewById checkedId              Toast makeText getBaseContext    radioButton getText    Toast LENGTH SHORT  show

User · Answer

Radiogroup rgteam  String team  rgteam setOnCheckedChangeListener new RadioGroup OnCheckedChangeListener              Override         public void onCheckedChanged RadioGroup group   IdRes int checkedId                RadioButton rb   RadioButton  findViewById checkedId               team   rb getText   toString

User · Answer

int genid gender getCheckedRadioButtonId    RadioButton radioButton    RadioButton  findViewById genid   String gender radioButton getText   toString      Hope this works  You can convert your output to string in the above manner  gender getCheckedRadioButtonId    - gender is the id of RadioGroup

User · Answer

Thanks a lot to Chris   This is my solution   RadioGroup radgroup opcionesEventos   null     private static String   arrayEventos                  Congesti  n    Derrumbe    Accidente          Override     protected void onCreate Bundle savedInstanceState                super onCreate savedInstanceState           setContentView R layout activity maps           radgroup opcionesEventos    RadioGroup findViewById R id rg opciones evento           int i 0   a new ln         for String evento   arrayEventos                  RadioButton nuevoRadio   crearRadioButton evento    a old ln             RadioButton nuevoRadio   crearRadioButton evento i    a new ln             radgroup opcionesEventos addView nuevoRadio i                      RadioButton primerRadio    RadioButton  radgroup opcionesEventos getChildAt 0           primerRadio setChecked true      private RadioButton crearRadioButton String evento  int n                  RadioButton nuevoRadio   new RadioButton this    a old ln         RadioButton nuevoRadio   new RadioButton getApplicationContext      a new ln          LinearLayout LayoutParams params   new RadioGroup LayoutParams                  RadioGroup LayoutParams WRAP CONTENT                  RadioGroup LayoutParams WRAP CONTENT           nuevoRadio setLayoutParams params           nuevoRadio setText evento           nuevoRadio setTag evento           return nuevoRadio           Override     protected void onResume                 radgroup opcionesEventos setOnCheckedChangeListener new RadioGroup OnCheckedChangeListener                  Override             public void onCheckedChanged RadioGroup group  int checkedId                    RadioButton radioButton    RadioButton  group findViewById checkedId                     int mySelectedIndex    int  radioButton getTag                    String mySelectedIndex   radioButton getTag   toString                                      super onResume

User · Answer

Tested and working  Check this  import android app Activity  import android os Bundle  import android view View  import android view View OnClickListener  import android widget Button  import android widget RadioButton  import android widget RadioGroup  import android widget Toast   public class MyAndroidAppActivity extends Activity      private RadioGroup radioGroup    private RadioButton radioButton    private Button btnDisplay      Override   public void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout main        addListenerOnButton            public void addListenerOnButton          radioGroup    RadioGroup  findViewById R id radio       btnDisplay    Button  findViewById R id btnDisplay        btnDisplay setOnClickListener new OnClickListener               Override         public void onClick View v                        get selected radio button from radioGroup             int selectedId   radioGroup getCheckedRadioButtonId                    find the radiobutton by returned id             radioButton    RadioButton  findViewById selectedId                Toast makeText MyAndroidAppActivity this                  radioButton getText    Toast LENGTH SHORT  show                                 xml   lt RadioGroup         android id    id radio          android layout width  wrap content          android layout height  wrap content   gt            lt RadioButton             android id    id radioMale              android layout width  wrap content              android layout height  wrap content              android text   string radio male               android checked  true    gt            lt RadioButton             android id    id radioFemale              android layout width  wrap content              android layout height  wrap content              android text   string radio female    gt        lt  RadioGroup gt

User · Answer

just use getCheckedRadioButtonId   function to determine wether if anything is checked  if -1 is return  you can avoid toast appear

[java] Android getting value from selected radiobutton

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