[Android] Remove android_commands uses from build/android/.

build/android/pylib/device/adb_wrapper.py

Index: build/android/pylib/device/adb_wrapper.py
diff --git a/build/android/pylib/device/adb_wrapper.py b/build/android/pylib/device/adb_wrapper.py
index 36f8f484b00fbe2ec05c4c440ab13af10dde71f2..f9018d1f74902099e2e141321bceefe209f4dec7 100644
--- a/build/android/pylib/device/adb_wrapper.py
+++ b/build/android/pylib/device/adb_wrapper.py
@@ -17,6 +17,7 @@ from pylib import cmd_helper
 from pylib import constants
 from pylib.device import decorators
 from pylib.device import device_errors
+from pylib.device import device_filter
 from pylib.utils import timeout_retry
 
 
@@ -158,22 +159,30 @@ class AdbWrapper(object):
     cls._RunAdbCmd(['start-server'], timeout=timeout, retries=retries,
                    cpu_affinity=0)
 
-  # TODO(craigdh): Determine the filter criteria that should be supported.
   @classmethod
-  def GetDevices(cls, timeout=_DEFAULT_TIMEOUT, retries=_DEFAULT_RETRIES):
+  def GetDevices(cls, filters=None, timeout=_DEFAULT_TIMEOUT,
+                 retries=_DEFAULT_RETRIES):
     """Get the list of active attached devices.
 
     Args:
+      filters: (optional) A list of binary functions that take an AdbWrapper
+          instance and a string description. Any device for which all provided
+          filter functions do not return True will not be included in the
+          returned list.
       timeout: (optional) Timeout per try in seconds.
       retries: (optional) Number of retries to attempt.
 
     Yields:
       AdbWrapper instances.
     """
+    if filters is None:
+      filters = device_filter.DefaultFilters()
+
     output = cls._RunAdbCmd(['devices'], timeout=timeout, retries=retries)
     lines = [line.split() for line in output.splitlines()]
-    return [AdbWrapper(line[0]) for line in lines
-            if len(line) == 2 and line[1] == 'device']
+
+    devices = [AdbWrapper(line[0]) for line in lines if len(line) == 2]

[perezju, 2015/04/15 09:25:44]

nit: not that it makes much of a difference, but you can avoid building the
intermediate lists by turning them into generators, i.e.:

lines = (line.split() ...)
devuces = (AdbWrapper ...)

[jbudorick, 2015/04/15 13:06:59]

I think we should encourage using generators over lists in single-use scenarios.
Thanks for calling these out, I'll make the switch.

+    return [d for d in devices if all(f(d) for f in filters)]
 
   def GetDeviceSerial(self):
     """Gets the device serial number associated with this object.