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Android supports 4 dialog boxes: AlertDialog : An alert dialog box supports 0 to 3 buttons and a list of selectable elements, including check boxes and radio buttons. Among the other dialog boxes, the most suggested dialog box is the alert dialog box. ProgressDialog: This dialog box displays a progress wheel or a progress bar. It is an extension of AlertDialog and supports adding buttons. DatePickerDialog: This dialog box is used for selecting a date by the user. TimePickerDialog: This dialog box is used for selecting time by the user.