Android UI How to - Add controls to RadioGroup

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You can manipulate the RadioGroup programmatically.

For example, you can obtain a reference to a radio group and add a radio button (or other type of control).

Example

Layout xml

/* ww w .  jav a 2  s.  c om*/
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">

    <RadioButton
        android:id="@+id/anotherRadBtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Outside" />

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

        <RadioButton
            android:id="@+id/chRBtn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Chicken" />

        <RadioButton
            android:id="@+id/fishRBtn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Fish" />

        <RadioButton
            android:id="@+id/stkRBtn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Steak" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="My Favorite" />

    </RadioGroup>
</LinearLayout>

Adding a RadioButton to a RadioGroup in Code

package com.java2s.app;
/*from  ww  w  .  java2  s .  c  o  m*/
import android.app.Activity;
import android.os.Bundle;
import android.widget.RadioButton;
import android.widget.RadioGroup;

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        RadioGroup radGrp = (RadioGroup)findViewById(R.id.radGrp);
        RadioButton newRadioBtn = new RadioButton(this);
        newRadioBtn.setText("java2s.com");
        radGrp.addView(newRadioBtn);
    }

}

Note

Once a radio button is selected within a radio group, the user cannot uncheck it by clicking it again. The only way to clear all radio buttons in a radio group is to call the clearCheck() method on the RadioGroup programmatically.

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