这工作对我来说，虽然还没有试过设置Exchange帐户：

This worked for me, though haven't tried setting a Exchange account:

  fieldLength = 50
  # select all the chars
  self.device.press('KEYCODE_SHIFT_LEFT', MonkeyDevice.DOWN)
  for i in range(fieldLength):
     self.device.press('KEYCODE_DPAD_LEFT', MonkeyDevice.DOWN_AND_UP)
     MonkeyRunner.sleep(1)
  self.device.press('KEYCODE_SHIFT_LEFT', MonkeyDevice.UP)

  # delete them
  self.device.press('KEYCODE_DEL', MonkeyDevice.DOWN_AND_UP)