How to get the selected index of a RadioGroup in Android

Question

Is there an easy way to get the selected index of a RadioGroup in Android or do I have to use OnCheckedChangeListener to listen for changes and have something that holds the last index selected?

example xml:

<RadioGroup android:id="@+id/group1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical">
    <RadioButton android:id="@+id/radio1" android:text="option 1" android:layout_width="wrap_content" android:layout_height="wrap_content" />
    <RadioButton android:id="@+id/radio2" android:text="option 2" android:layout_width="wrap_content" android:layout_height="wrap_content" />
    <RadioButton android:id="@+id/radio3" android:text="option 3" android:layout_width="wrap_content" android:layout_height="wrap_content" />
    <RadioButton android:id="@+id/radio4" android:text="option 4" android:layout_width="wrap_content" android:layout_height="wrap_content" />
    <RadioButton android:id="@+id/radio5" android:text="option 5" android:layout_width="wrap_content" android:layout_height="wrap_content" />
</RadioGroup>

if a user selects option 3 I want to get the index, 2.

BP. · Accepted Answer · 2018-10-17T17:56:07.923

516

You should be able to do something like this:

int radioButtonID = radioButtonGroup.getCheckedRadioButtonId();
View radioButton = radioButtonGroup.findViewById(radioButtonID);
int idx = radioButtonGroup.indexOfChild(radioButton);

If the RadioGroup contains other Views (like a TextView) then the indexOfChild() method will return wrong index.

To get the selected RadioButton text on the RadioGroup:

 RadioButton r = (RadioButton) radioButtonGroup.getChildAt(idx);
 String selectedtext = r.getText().toString();

edited Oct 17 '18 at 17:56

answered Jun 22 '11 at 13:58

BP.

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But what if those buttons do not have their `android:id` attributes set? – neuront Oct 31 '12 at 08:43
@BP i have same doubt in accessing radio buttons when none of the parent or the radio buttons id is set. – Shubham AgaRwal Mar 02 '16 at 10:16
2

@neuront As long as you do radioGroup.findViewById(radioButtonID) it'll work. RadioGroup does set 1, 2, 3, 4, and so on as view's IDs, so if you do search for them within it's context, it'll work – Reinherd Jun 13 '16 at 15:20
This not working if default (and untouched by User) RadioButton is setted. – Ninja Coding Jun 20 '17 at 22:24
2

@NinjaCoding If you made the same mistake as me, you have to set the default (initial) radio button by calling radioGroup.check(selectedRadioButton.id), not radioButton.setChecked(true). – Lensflare Oct 17 '18 at 15:41

score 117 · Answer 2 · answered Jun 22 '11 at 14:06

117

This should work,

int index = myRadioGroup.indexOfChild(findViewById(myRadioGroup.getCheckedRadioButtonId()));

answered Jun 22 '11 at 14:06

source.rar

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6

Use getActivity().findViewById() if you are using in the Fragment. – Sanjeet A Aug 29 '15 at 21:11

score 56 · Answer 3 · edited Jul 09 '16 at 09:59

56

You could have a reference to the radio group and use getCheckedRadioButtonId () to get the checked radio button id. Take a look here

RadioGroup radioGroup = (RadioGroup)findViewById(R.id.radio_group);

Then when you need to get the selected radio option.

int checkedRadioButtonId = radioGroup.getCheckedRadioButtonId();
if (checkedRadioButtonId == -1) {
    // No item selected
}
else{
    if (checkedRadioButtonId == R.id.radio_button1) {
        // Do something with the button
    }
}

edited Jul 09 '16 at 09:59

ban-geoengineering

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answered Jun 22 '11 at 13:11

Stefan Bossbaly

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yes, this is the id of the checked radio button, but what about the index of the radio button in the radio group? – John Boker Jun 22 '11 at 13:13
i can get the id, i want the index, they are different. – John Boker Jun 22 '11 at 13:16
what do you mean by index? is it in a list view? – Stefan Bossbaly Jun 22 '11 at 13:16
if i have 5 radiobuttons in the radiogroup, and the user selects the 3rd one i want to get 2, the index of the selected radiobutton in the radiogroup. this is not a listview. – John Boker Jun 22 '11 at 13:17
just to clarify if the user selects the 3rd button you want to get the 2nd one? radio groups and buttons do not have indexes. – Stefan Bossbaly Jun 22 '11 at 13:24
no, the index of the 3rd button is 2, zero based indexing. the first radio button has an index of 0, second is 1, third 2, etc... What you're saying is there's no good way to get the index, that's a valid answer too. – John Boker Jun 22 '11 at 13:27
You could put the RadioButton in an array list and then run a search for the id and convert that into an index – Stefan Bossbaly Jun 22 '11 at 13:29
Terrible idea if you have 20+ items. – Exegesis Sep 04 '12 at 18:03

score 29 · Answer 4 · answered Apr 20 '15 at 06:49

29

try this

        RadioGroup  group= (RadioGroup) getView().findViewById(R.id.radioGroup);
        group.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup radioGroup, int i) {
                View radioButton = radioGroup.findViewById(i);
                int index = radioGroup.indexOfChild(radioButton);
            }
        });

answered Apr 20 '15 at 06:49

Nooh

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This is works! But i can't understand why we need use this "radioButton" View.. – AlexS May 12 '20 at 16:05

score 10 · Answer 5 · answered Jun 22 '11 at 13:10

10

You can either use OnCheckedChangeListener or can use getCheckedRadioButtonId()

answered Jun 22 '11 at 13:10

ingsaurabh

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score 9 · Answer 6 · answered Oct 06 '12 at 10:23

9

You can use:

RadioButton rb = (RadioButton) findViewById(rg.getCheckedRadioButtonId());

answered Oct 06 '12 at 10:23

Marco Fantasia

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score 6 · Answer 7 · edited May 23 '13 at 08:13

6

//use to get the id of selected item

int selectedID = myRadioGroup.getCheckedRadioButtonId();

//get the view of the selected item

View selectedView = (View)findViewById( selectedID);

edited May 23 '13 at 08:13

Baby Groot

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answered May 23 '13 at 07:52

Jhoe-mar Pagao

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score 6 · Answer 8 · answered Oct 28 '16 at 09:16

It worked perfectly for me in this way:

    RadioGroup radioGroup = (RadioGroup) findViewById(R.id.radio_group);
    int radioButtonID = radioGroup.getCheckedRadioButtonId();
    RadioButton radioButton = (RadioButton) radioGroup.findViewById(radioButtonID);
    String selectedtext = (String) radioButton.getText();

score 5 · Answer 9 · edited Mar 14 '17 at 21:57

All you need is to set values first to your RadioButton, for example:

RadioButton radioButton = (RadioButton)findViewById(R.id.radioButton);      
radioButton.setId(1);        //some int value

and then whenever this spacific radioButton will be chosen you can pull its value by the Id you gave it with

RadioGroup radioGroup = (RadioGroup)findViewById(R.id.radioGroup);                     
int whichIndex = radioGroup.getCheckedRadioButtonId(); //of course the radioButton
                                                       //should be inside the "radioGroup"
                                                       //in the XML

Cheers!

score 5 · Answer 10 · edited Jul 11 '18 at 16:33

radioSexGroup=(RadioGroup)findViewById(R.id.radioGroup);

  btnDisplay=(Button)findViewById(R.id.button);

  btnDisplay.setOnClickListener(new View.OnClickListener() {
     @Override
     public void onClick(View v) {
        int selectedId=radioSexGroup.getCheckedRadioButtonId();
        radioSexButton=(RadioButton)findViewById(selectedId);
        Toast.makeText(MainActivity.this,radioSexButton.getText(),Toast.LENGTH_SHORT).show();
     }
  });

score 5 · Answer 11 · answered Sep 22 '19 at 03:54

5

Kotlin:

val selectedIndex = radioButtonGroup?.indexOfChild(
  radioButtonGroup?.findViewById(
    radioButtonGroup.getCheckedRadioButtonId())
)

answered Sep 22 '19 at 03:54

Anand Kumar

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score 3 · Answer 12 · answered Aug 23 '20 at 10:50

Late to the party, but here is a simplification of @Tarek360's Kotlin answer that caters for RadioGroups that might contain non-RadioButtons:

    val RadioGroup.checkedIndex: Int
        get() = children
            .filter { it is RadioButton }
            .indexOfFirst { it.id == checkedRadioButtonId }

If you're RadioFroup definitely only has RadioButtons then this can be a simple as:

    private val RadioGroup.checkedIndex = 
        children.indexOfFirst { it.id == checkedRadioButtonId }

Then you don't have the overhead of findViewById.

I posted this question 9 years ago and answers are still coming in. Have my upvote :) — John Boker, Aug 25 '20 at 18:14

score 2 · Answer 13 · answered Dec 22 '14 at 14:10

2

 int index_selected = radio_grp.indexOfChild(radio_grp
                .findViewById(radio_grp.getCheckedRadioButtonId()));

answered Dec 22 '14 at 14:10

Prashant Maheshwari Andro

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MADWolfHD · Answer 14 · 2017-04-27T14:15:01.550

2

just use this:

    int index = 2;
    boolean option3Checked = radioGroup.getCheckedRadioButtonId() == radioGroup.getChildAt(2).getId();

edited Apr 27 '17 at 14:15

answered Apr 27 '17 at 14:07

MADWolfHD

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score 2 · Answer 15 · answered Mar 07 '20 at 08:42

Here is a Kotlin extension to get the correct position even if your group contains a TextView or any non-RadioButton.

fun RadioGroup.getCheckedRadioButtonPosition(): Int {
    val radioButtonId = checkedRadioButtonId
    return children.filter { it is RadioButton }
        .mapIndexed { index: Int, view: View ->
            index to view
        }.firstOrNull {
            it.second.id == radioButtonId
        }?.first ?: -1
}

score 1 · Answer 16 · edited Feb 16 '16 at 11:16

1

you can do

findViewById

from the radio group .

Here it is sample :

((RadioButton)my_radio_group.findViewById(R.id.radiobtn_veg)).setChecked(true);

edited Feb 16 '16 at 11:16

Héctor

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answered Sep 09 '15 at 04:08

Faheem

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score 1 · Answer 17 · answered Aug 13 '19 at 21:11

You can simply

-declare the radio group and a radio button out of onCreate method

private RadioGroup GrupName;
private RadioButton NameButton;

-set the view id in the onCreate method

GrupName = (RadioGroup) findViewById(R.id.radioGroupid);

-take the radiobutton id selected using

int id = GroupName.getCheckedRadioButtonId();

-use the id to match the buttonselected view

NameButton = (RadioButton) findViewById(id);

-finally get the value of the radio button

String valueExpected = NameButton.getText().toString();

--- PS: IF YOU WANT AN INT VALUE, THEN YOU CAN CAST IT

int valueExpectedIn = Integer.parseInt(valueExpected);

score 0 · Answer 18 · answered Apr 29 '20 at 00:38

radioSexGroup = (RadioGroup) findViewById(R.id.radioSex);
btnDisplay = (Button) findViewById(R.id.btnDisplay);
btnDisplay.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            // get selected radio button from radioGroup
            int selectedId = radioSexGroup.getCheckedRadioButtonId();
            // find the radiobutton by returned id
            radioSexButton = (RadioButton) findViewById(selectedId);
Toast.makeText(MainActivity.this,radioSexButton.getText(),Toast.LENGTH_SHORT).show();
        }
    });

score 0 · Answer 19 · answered Oct 07 '21 at 07:59

You have already assigned an id for each radio button. With a case block you can detect manually the selected radio button or with OnCheckedChangeListener you get it too.

xml:

    <RadioGroup
        android:id="@+id/rd_group_pick_reason"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@id/ti_titel"
        android:orientation="horizontal"
        android:paddingHorizontal="16dp"
        >
        <com.google.android.material.radiobutton.MaterialRadioButton
            android:id="@+id/rd_not_deliverable"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="0.5"
            android:text="@string/txt_not_deliverable"
            android:checked="true"
            />

        <com.google.android.material.radiobutton.MaterialRadioButton
            android:id="@+id/rd_after_pack"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="0.5"
            android:text="@string/txt_after_pack"
            />
    </RadioGroup>

java:

final RadioGroup radioGroup = dialogView.findViewById(R.id.rd_group_pick_reason);    
switch (radioGroup.getCheckedRadioButtonId()) {
    case R.id.rd_not_deliverable:
        // TODO
    break;
    case R.id.rd_after_pack:
        // TODO
    break;
}

or

radioGroup.setOnCheckedChangeListener((group, checkedId) -> {
    switch (group.getCheckedRadioButtonId()) {
        case R.id.rd_not_deliverable:
            System.out.println("not deliverable");
            break;
        case R.id.rd_after_pack:
            System.out.println("after pack");
            break;
    }

How to get the selected index of a RadioGroup in Android

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