Add checkboxes to your app

Checkboxes let the user select one or more options from a set. Typically, you present checkbox options in a vertical list.

To create each checkbox option, create a CheckBox in your layout. Because a set of checkbox options lets the user select multiple items, each checkbox is managed separately, and you must register a click listener for each one.

Respond to click events

Begin by creating a layout with CheckBox objects in a list:

<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<CheckBoxandroid:id="@+id/checkbox_meat"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Meat"/>
<CheckBoxandroid:id="@+id/checkbox_cheese"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Cheese"/>
</LinearLayout>

Once your layout is ready, head to your Activity or Fragment, find your CheckBox views, and set a change listener, as in the following example:

findViewById<CheckBox>(R.id.checkbox_meat)
.setOnCheckedChangeListener{buttonView,isChecked->
Log.d("CHECKBOXES","Meat is checked: $isChecked")
}
findViewById<CheckBox>(R.id.checkbox_cheese)
.setOnCheckedChangeListener{buttonView,isChecked->
Log.d("CHECKBOXES","Cheese is checked: $isChecked")
}

findViewById<CheckBox>(R.id.checkbox_meat)
.setOnCheckedChangeListener{buttonView,isChecked->
Log.d("CHECKBOXES","Meat is checked: $isChecked");
}
findViewById<CheckBox>(R.id.checkbox_cheese)
.setOnCheckedChangeListener{buttonView,isChecked->
Log.d("CHECKBOXES","Cheese is checked: $isChecked");
}

The previous code prints a message in Logcat every time the checkboxes change status.