[Android] Force stop test app before launch (start -S)

build/android/pylib/android_commands.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Provides an interface to communicate with the device via the adb command.
 
 Assumes adb binary is currently on system path.
 """
 
 import collections
@@ skipping 636 matching lines @@
 
   def CloseApplication(self, package):
     """Attempt to close down the application, using increasing violence.
 
     Args:
       package: Name of the process to kill off, e.g.
       com.google.android.apps.chrome
     """
     self.RunShellCommand('am force-stop ' + package)
 
+  def GetApplicationPath(self, package):
+    """Get the installed apk path on the device for the given package.
+
+    Args:
+      package: Name of the package.
+
+    Returns:
+      Path to the apk on the device if it exists, None otherwise.
+    """
+    pm_path_output  = self.RunShellCommand('pm path ' + package)
+    # The path output contains anything if and only if the package
+    # exists.
+    if pm_path_output:
+      # pm_path_output is of the form: "package:/path/to/foo.apk"
+      return pm_path_output[0].split(':')[1]
+    else:
+      return None
+
   def ClearApplicationState(self, package):
     """Closes and clears all state for the given |package|."""
     # Check that the package exists before clearing it. Necessary because
     # calling pm clear on a package that doesn't exist may never return.
     pm_path_output  = self.RunShellCommand('pm path ' + package)
     # The path output only contains anything if and only if the package exists.
     if pm_path_output:
-      self.CloseApplication(package)
       self.RunShellCommand('pm clear ' + package)
 
   def SendKeyEvent(self, keycode):
     """Sends keycode to the device.
 
     Args:
       keycode: Numeric keycode to send (see "enum" at top of file).
     """
     self.RunShellCommand('input keyevent %d' % keycode)
 
@@ skipping 637 matching lines @@
   """
   def __init__(self, output):
     self._output = output
 
   def write(self, data):
     data = data.replace('\r\r\n', '\n')
     self._output.write(data)
 
   def flush(self):
     self._output.flush()