Android UI Tutorial - Android RadioButton








A radio button gives the users several choices and users can only selec a single item.

Radio buttons generally belong to a group, and each group can only have one item selected at a time.

To create a group of radio buttons in Android, first create a RadioGroup, and then populate the group with radio buttons.

Example

In Android, you implement a radio group using android.widget.RadioGroup and a radio button using android.widget.RadioButton. 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">

    <RadioGroup
        android:id="@+id/rBtnGrp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical">

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

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

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

    </RadioGroup>

</LinearLayout>
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