根据设备时间执行方法

Question

我有一个timePicker

    String mName = input.getText().toString();
    if (input.getParent() != null)
        ((ViewGroup) input.getParent()).removeView(input);
    if (layout.getParent() != null)
        ((ViewGroup) layout.getParent()).removeView(layout);
    mAlertDialog.dismiss();

    Calendar mcurrentTime = Calendar.getInstance();
    int hour = mcurrentTime.get(Calendar.HOUR_OF_DAY);
    int minute = mcurrentTime.get(Calendar.MINUTE);
    TimePickerDialog mTimePicker;
    mTimePicker = new TimePickerDialog(Chat.this, new TimePickerDialog.OnTimeSetListener() {
        @Override
        public void onTimeSet(TimePicker timePicker, int selectedHour, int selectedMinute) {
            Toast.makeText(getApplicationContext(), "Make sure you have internet access at this time selected",
                    Toast.LENGTH_LONG).show();
        }
    }, hour, minute, true);// Yes 24 hour time
    mTimePicker.setTitle("Select Time");
    mTimePicker.show();                            

我希望在用户选择的时间执行一种方法。我怎样才能做到这一点。说我想在给定的时间更改Firebase中的特定数据，我该怎么做？请帮帮我