Android(安卓)OTA升级新旧版本任意升级

1. Android升级到较新的版本后，想用.zip升级包升回旧的版本时，在升级时会发错。这是由于android系统时对升级文件有版本检测。

2. build/tools/releasetools/ota_from_target_files:

def main(argv):  def option_handler(o, a):    if o == "--board_config":      pass   # deprecated    elif o in ("-k", "--package_key"):      OPTIONS.package_key = a    elif o in ("-i", "--incremental_from"):      OPTIONS.incremental_source = a    elif o in ("-w", "--wipe_user_data"):      OPTIONS.wipe_user_data = True    elif o in ("-n", "--no_prereq"):      OPTIONS.omit_prereq = True    elif o in ("-o", "--oem_settings"):      OPTIONS.oem_source = a    elif o in ("-e", "--extra_script"):      OPTIONS.extra_script = a    elif o in ("-a", "--aslr_mode"):      if a in ("on", "On", "true", "True", "yes", "Yes"):        OPTIONS.aslr_mode = True      else:        OPTIONS.aslr_mode = False    elif o in ("-t", "--worker_threads"):

3. build/tools/releasetools/edify_generator.py 比较时间戳就是在这里

def AssertOlderBuild(self, timestamp, timestamp_text):
"""Assert that the build on the device is older (or the same as)
the given timestamp."""
self.script.append(
('(!less_than_int(%s, getprop("ro.build.date.utc"))) || '
'abort("Can\'t install this package (%s) over newer '
'build (" + getprop("ro.build.date") + ").");'
) % (timestamp, timestamp_text))

4. 如果不想系统检测版本，将ota_from_target_files文件中改为OPTIONS.omit_prereq = False

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