How can multiple number pickers be grouped together in Android?

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Multiple number pickers can be grouped together in Android using the NumberPicker class and a layout manager such as LinearLayout or GridLayout.

Here's an example of how to group three number pickers together horizontally using LinearLayout:

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <NumberPicker
        android:id="@+id/numberPicker1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <NumberPicker
        android:id="@+id/numberPicker2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <NumberPicker
        android:id="@+id/numberPicker3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

This will create three separate number pickers that are horizontally aligned. You can adjust the layoutwidth and layoutheight attributes of the NumberPicker and LinearLayout as needed to achieve the desired appearance.