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.

Coverage

Answer 1

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();

Tenner

But what if those buttons do not have their android:id attributes set? – Antistrophe

@BP i have same doubt in accessing radio buttons when none of the parent or the radio buttons id is set. – Ointment

@Antistrophe 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 – Shavonda

This not working if default (and untouched by User) RadioButton is setted. – Derma

@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). – Odonnell

Answer 2

This should work,

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

Kerrikerrie

Use getActivity().findViewById() if you are using in the Fragment. – Stilton

Answer 3

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
    }
}

Earnestineearnings

yes, this is the id of the checked radio button, but what about the index of the radio button in the radio group? – Coverage

i can get the id, i want the index, they are different. – Coverage

what do you mean by index? is it in a list view? – Earnestineearnings

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. – Coverage

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. – Earnestineearnings

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. – Coverage

You could put the RadioButton in an array list and then run a search for the id and convert that into an index – Earnestineearnings

Terrible idea if you have 20+ items. – Tautog

Answer 4

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);
            }
        });

Hermes

This is works! But i can't understand why we need use this "radioButton" View.. – Turbulent

Answer 5

You can either use OnCheckedChangeListener or can use getCheckedRadioButtonId()

Discant

Answer 6

You can use:

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

Conciliator

Answer 7

//use to get the id of selected item

int selectedID = myRadioGroup.getCheckedRadioButtonId();

//get the view of the selected item

View selectedView = (View)findViewById( selectedID);

Flamenco

Answer 8

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();

Cosgrave

Answer 9

Kotlin:

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

Thermaesthesia

Answer 10

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!

Pancreas

Answer 11

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();
     }
  });

Moreover

Answer 12

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.

Rutledge

I posted this question 9 years ago and answers are still coming in. Have my upvote :) – Coverage

Answer 13

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

Uball

Answer 14

just use this:

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

Zadazadack

Answer 15

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
}

Lackey

Answer 16

you can do

findViewById

from the radio group .

Here it is sample :

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

Mickeymicki

Answer 17

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);

Eighty

Answer 18

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();
        }
    });

Jhansi

Answer 19

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;
    }

Ciliate