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Android supports 4 dialog boxes: a.) AlertDialog: Alert dialog box supports 0 to 3 buttons and a list of selectable elements which includes check boxes and radio buttons. b.) ProgressDialog: This dialog box is an extension of AlertDialog and supports adding buttons. It displays a progress wheel or bar. c.) DatePickerDialog: The user can select the date using this dialog box. d.) TimePickerDialog: The user can select the time using this dialog box.