Set selected index of an Android RadioGroup

Question

Is there a way to set the selected index of a RadioGroup in android, other than looping through the child radiobuttons and selecting checking the radio button at the selected in

Answer 1

This Worked For me, I created radio button dynamically by

  private void createRadioButton() {

    RadioButton[] rb = new RadioButton[5];

    RadioGroup.LayoutParams layoutParams = new RadioGroup.LayoutParams(
            ViewGroup.LayoutParams.WRAP_CONTENT,
            ViewGroup.LayoutParams.WRAP_CONTENT,
            1.0f);

    radioGroup.setOrientation(RadioGroup.HORIZONTAL);

    for (int ID = 0; ID < 5; ID++) {
        rb[ID] = new RadioButton(this);
        rb[ID].setLayoutParams(layoutParams);
        rb[ID].setText("Button_Text");
        radioGroup.addView(rb[ID]); //the RadioButtons are added to the radioGroup instead of the layout
    }
}

Now Check a button using,

int radio_button_Id = radioGroup.getChildAt(index).getId();

radioGroup.check( radio_button_Id );

Answer 2

Siavash's answer is correct:

((RadioButton)radioGroup.getChildAt(index)).setChecked(true);

But be aware that a radioGroup can contain views other than radioButtons -- like this example that includes a faint line under each choice.

<RadioGroup
    android:id="@+id/radioKb"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" >

    <RadioButton
        android:id="@+id/kb1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:button="@null"
        android:drawableRight="@android:drawable/btn_radio"
        android:text="Onscreen - ABC" />

    <View
        android:layout_width="fill_parent"
        android:layout_height="1dp"
        android:background="#33000000" />

    <RadioButton
        android:id="@+id/kb2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:button="@null"
        android:drawableRight="@android:drawable/btn_radio"
        android:text="Onscreen - Qwerty" />

    <View
        android:layout_width="fill_parent"
        android:layout_height="1dp"
        android:background="#33000000" />

    <RadioButton
        android:id="@+id/kb3"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:button="@null"
        android:drawableRight="@android:drawable/btn_radio"
        android:text="Standard softkey" />

    <View
        android:layout_width="fill_parent"
        android:layout_height="1dp"
        android:background="#33000000" />

    <RadioButton
        android:id="@+id/kb4"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:button="@null"
        android:drawableRight="@android:drawable/btn_radio"
        android:text="Physical keyboard" />

    <View
        android:layout_width="fill_parent"
        android:layout_height="1dp"
        android:background="#33000000" />

</RadioGroup>

In this case using an index of 1, for example, would generate an error. The item at index 1 is the first separator line -- not a radioButton. The radioButtons in this example are at indexes 0, 2, 4, 6.

Answer 3

If your radio group is defined in a layout xml file, each button can be assigned an id. Then you just check a button like this

radioGroup.check(R.id.myButtonId);

If you created your radio group programmatically (I'm not even sure how you do this...), you might want to consider creating a special layout xml file just for the radio group so that you can assign R.id.* ids to the buttons.

Please see the answer below if you are, in fact, looking to set the radio button group by index, see the answer below.

((RadioButton)radioGroup.getChildAt(index)).setChecked(true);

Answer 4

Using Kotlin you can make it by

  (radio_group_id.getChildAt(index) as RadioButton).isChecked = true

or

radio_group_id.check(R.id.radio_button_id)

Answer 5

you can do findViewById from the radio group .

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

Answer 6

Inside onBindViewHolder set the tag to Button Group

@Override
public void onBindViewHolder(final CustomViewHolder holder, final int position) {
   ...
   holder.ButtonGroup.setTag(position);
}

and in the ViewHolder

ButtonGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(RadioGroup radioGroup, int checkedId) {
        ...
        int id = radioGroup.getCheckedRadioButtonId();

        RadioButton radioButton = (RadioButton) radioGroup.findViewById(id);

        int clickedPos = (Integer) radioGroup.getTag();

        packageModelList.get(clickedPos).getPoll_quest()
    }