[Android] Add process_resources.py to build Android library resources.

build/android/process_resources.py

+#!/usr/bin/env python
+#
+# 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.
+
+"""Process Android library resources to generate R.java and crunched images."""
+
+import optparse
+import os
+import subprocess
+
+
+BUILD_ANDROID_DIR = os.path.dirname(__file__)
+
+
+def ParseArgs():
+  """Parses command line options.
+
+  Returns:
+    An options object as from optparse.OptionsParser.parse_args()
+  """
+  parser = optparse.OptionParser()
+  parser.add_option('--android-sdk', help='path to the Android SDK folder')
+  parser.add_option('--android-sdk-tools',
+                    help='path to the Android SDK platform tools folder')
+  parser.add_option('--R-package', help='Java package for generated R.java')
+  parser.add_option('--R-dir', help='directory to hold generated R.java')
+  parser.add_option('--res-dir', help='directory containing resources')
+  parser.add_option('--crunched-res-dir',
+                    help='directory to hold crunched resources')
+  (options, args) = parser.parse_args()
+
+  if args:
+    parser.error('No positional arguments should be given.')
+
+  # Check that required options have been provided.
+  required_options = ('android_sdk', 'android_sdk_tools', 'R_package',
+                      'R_dir', 'res_dir', 'crunched_res_dir')
+  for option_name in required_options:
+    if getattr(options, option_name) is None:
+      parser.error('--%s is required' % option_name.replace('_', '-'))
+
+  return options
+
+
+def main():
+  options = ParseArgs()
+  android_jar = os.path.join(options.android_sdk, 'android.jar')
+  aapt = os.path.join(options.android_sdk_tools, 'aapt')
+  dummy_manifest = os.path.join(BUILD_ANDROID_DIR, 'AndroidManifest.xml')
+
+  # Generate R.java. This R.java contains non-final constants and is used only
+  # while compiling the library jar (e.g. chromium_content.jar). When building
+  # an apk, a new R.java file with the correct resource -> ID mappings will be
+  # generated by merging the resources from all libraries and the main apk
+  # project.
+  subprocess.check_call([aapt,
+                         'package',
+                         '-m',
+                         '--non-constant-id',
+                         '--custom-package', options.R_package,
+                         '-M', dummy_manifest,
+                         '-S', options.res_dir,
+                         '-I', android_jar,
+                         '-J', options.R_dir])
+
+  # Crunch image resources. This shrinks png files and is necessary for 9-patch
+  # images to display correctly.
+  subprocess.check_call([aapt,
+                         'crunch',
+                         '-S', options.res_dir,
+                         '-C', options.crunched_res_dir])
+
+
+if __name__ == '__main__':
+  main()