¿Cómo puedo crear un radiogrupo 2×2?

Aquí tienes una pregunta muy similar: gridlayout 3×3. Porque no puedes hacer lo que quieres y quieres trivialy, debes aceptar 1 de las respuestas de la pregunta anterior. Lo que hice:

 public class GRadioGroup { List<RadioButton> radios = new ArrayList<RadioButton>(); /** * Constructor, which allows you to pass number of RadioButton instances, * making a group. * * @param radios * One RadioButton or more. */ public GRadioGroup(RadioButton... radios) { super(); for (RadioButton rb : radios) { this.radios.add(rb); rb.setOnClickListener(onClick); } } /** * Constructor, which allows you to pass number of RadioButtons * represented by resource IDs, making a group. * * @param activity * Current View (or Activity) to which those RadioButtons * belong. * @param radiosIDs * One RadioButton or more. */ public GRadioGroup(View activity, int... radiosIDs) { super(); for (int radioButtonID : radiosIDs) { RadioButton rb = (RadioButton)activity.findViewById(radioButtonID); if (rb != null) { this.radios.add(rb); rb.setOnClickListener(onClick); } } } /** * This occurs everytime when one of RadioButtons is clicked, * and deselects all others in the group. */ public void addRadioButtonsToGroup(RadioButton rb){ radios.add(rb); rb.setOnClickListener(onClick); } OnClickListener onClick = new OnClickListener() { @Override public void onClick(View v) { // let's deselect all radios in group for (RadioButton rb : radios) { ViewParent p = rb.getParent(); if (p.getClass().equals(RadioGroup.class)) { // if RadioButton belongs to RadioGroup, // then deselect all radios in it RadioGroup rg = (RadioGroup) p; rg.clearCheck(); } else { // if RadioButton DOES NOT belong to RadioGroup, // just deselect it rb.setChecked(false); } } // now let's select currently clicked RadioButton if (!v.getClass().equals(RadioButton.class)) { RadioButton rb = (RadioButton) v; rb.setChecked(true); } } }; /** * ** Returns the Id of the radio button that is checked or -1 if none are checked * * @return */ public int getCheckedRadioButtonId() { int checkedId = -1; // Loop each radio button for (RadioButton rb : radios) { if (rb.isChecked()) return rb.getId(); } return checkedId; } public void setCheckedRadioButton(int pos) { // let's deselect all radios in group for (RadioButton rb : radios) { ViewParent p = rb.getParent(); if (p.getClass().equals(RadioGroup.class)) { // if RadioButton belongs to RadioGroup, // then deselect all radios in it RadioGroup rg = (RadioGroup) p; rg.clearCheck(); } else { // if RadioButton DOES NOT belong to RadioGroup, // just deselect it rb.setChecked(false); } } radios.get(pos).setChecked(true); } public void setCheckedRadioButtonDefault() { radios.get(0).setChecked(true); } @Override public void finalize() { radios.clear(); } } 

Necesito agregar botones de radio programáticamente así que haga mi radiobutton.xml:

 <?xml version="1.0" encoding="utf-8"?> <RadioButton xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layoutDirection="rtl" android:paddingStart="@dimen/padding_right_rests_columns" android:paddingEnd="@dimen/padding_left_rest_column" android:textAlignment="center" android:layout_centerHorizontal="true" android:gravity="center" android:layout_gravity="center" android:layout_margin="5dp"> </RadioButton> 

Y para agregar (esto está en un fragment):

  GRadioGroup gr = new GRadioGroup(); RadioButton radioButton = (RadioButton) getActivity().getLayoutInflater().inflate(R.layout.radiobutton, null);//initialize and set content radioButton.setText("HEY") // And all the settings you want like position ... //finally gr.addRadioButtonsToGroup(radioButton); 

Desventajas? tienes que manejar el grupo de radio seleccionado con bundle o intents si la actividad / fragment / lo que sea se destruyó.

¡Espero ayudarte!