To define the click event handler for a checkbox, add the android:onClick attribute to the element in your XML layout. The value for this attribute must be the name of the method you want to call in response to a click event. The Activity hosting the layout must then implement the corresponding method.

If a checkbox is in checked state when the form is submitted, the name of the checkbox is sent along with the value of the value property (if the checkbox is not checked, no information is sent).

In HTML, whenever a checkbox is checked and is POSTed it has a value of "on". If the checkbox is unchecked it has no value.

By default, the android CheckBox will be in the OFF (Unchecked) state. We can change the default state of CheckBox by using android:checked attribute. In case, if we want to change the state of CheckBox to ON (Checked), then we need to set android:checked = “true” in our XML layout file.

You can call isChecked() on a checkbox to get its status. If you want to count the number of checked checkboxes you could store then in an ArrayList and loop through that. isEnable() just return True if this view is enabled, false otherwise.

It is generally used in a place where user can select one or more than choices from a given list of choices. For example, selecting hobbies. It has two states – checked or unchecked. public boolean isChecked(): If CheckBox is in checked state then return true otherwise false.

A CheckBox is an on/off switch that can be toggled by the user. You should use check-boxes when presenting users with a group of selectable options that are not mutually exclusive.