React-Native: How to collect the systrace in android

问题

I followed JS: https://facebook.github.io/react-native/docs/android-ui-performance.html to analyze the performance of my app. when run this command $ <path_to_android_sdk>/platform-tools/systrace/systrace.py --time=10 -o trace.html sched gfx view -a <your_package_name> as mentioned in the documentation, one .js file has been opened in the code editor as follows,

 #!/usr/bin/env python

 # Copyright (c) 2015 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.

 import os
 import sys

 version = sys.version_info[:2]
 if version != (2, 7):
 sys.stderr.write('Systrace does not support Python %d.%d. '
               'Please use Python 2.7.\n' % version)
 sys.exit(1)

 systrace_dir = os.path.abspath(
 os.path.join(os.path.dirname(__file__), 'catapult', 'systrace'))
 sys.path.insert(0, systrace_dir)

 def RemoveAllStalePycFiles(base_dir):
 """Scan directories for old .pyc files without a .py file and delete them."""
 for dirname, _, filenames in os.walk(base_dir):
 if '.git' in dirname:
  continue
 for filename in filenames:
  root, ext = os.path.splitext(filename)
  if ext != '.pyc':
    continue

  pyc_path = os.path.join(dirname, filename)
  py_path = os.path.join(dirname, root + '.py')

  try:
    if not os.path.exists(py_path):
      os.remove(pyc_path)
  except OSError:
    # Wrap OS calls in try/except in case another process touched this file.
    pass

try:
  os.removedirs(dirname)
except OSError:
  # Wrap OS calls in try/except in case another process touched this dir.
  pass

 if __name__ == '__main__':
    RemoveAllStalePycFiles(os.path.dirname(__file__))
    from systrace import run_systrace
    sys.exit(run_systrace.main())

as soon as this file is opened, editor shows an error like,

This where I got struck. Can anybody help how to proceed from here to collect the systrace?. Thank You!

来源：https://stackoverflow.com/questions/60053769/react-native-how-to-collect-the-systrace-in-android

标签

react-native-android

systrace