def wait_for_activity(self, activity, timeout=15, interval=0.5):
'''等待Activity打开
:param activity: Activtiy名称
:type activity: string
:param timeout: 超时时间，单位：S
:type timeout: int/float
:param interval: 检查间隔时间，单位：S
:type interval: int/float
'''
time0 = time.time()
while time.time() - time0 < timeout:
if self.crashed:
raise RuntimeError('%s Crashed' % self.__class__.__name__)
current_activity = self.device.get_current_activity()
if current_activity == activity: return True
time.sleep(interval)
raise ControlNotFoundError(
'Wait for Activity %s timeout, current Activity: %s' %
(activity, current_activity))