How to set CheckBox checked in android programmatically?
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.
How to use CheckBox in android Studio?
To define the click event handler for a checkbox, add the android:onClick attribute to the <CheckBox> 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.