import os
import subprocess
class Adb(object):
 """ Provides some adb methods """
 @staticmethod
 def adb_devices():
  """
  Do adb devices
  :return The first connected device ID
  """
  cmd = "adb devices"
  c_line = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()[0]
  if c_line.find("List of devices attached") < 0: # adb is not working
   return None
  return c_line.split("\t")[0].split("\r\n")[-1] # This line may have different format
 @staticmethod
 def pull_sd_dcim(device, target_dir='E:/files'):
  """ Pull DCIM files from device """
  print "Pulling files"
  des_path = os.path.join(target_dir, device)
  if not os.path.exists(des_path):
   os.makedirs(des_path)
  print des_path
  cmd = "adb pull /sdcard/DCIM/ " + des_path
  result = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
  print result
  print "Finish!"
  return des_path
 @staticmethod
 def some_adb_cmd():
  p = subprocess.Popen('adb shell cd sdcard&&ls&&cd ../sys&&ls',
        stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  return_code = p.poll()
  while return_code is None:
   line = p.stdout.readline()
   return_code = p.poll()
   line = line.strip()
   if line:
    print line
  print "Done"