[Android] Fix some PEP8 errors.

Summary of the types of errors:
* E128: Bad indent
* E203: whitespace before ":"
* E222: multiple spaces after operator
* E231: missing whitespace after operator
* E251: unexpected spaces around keyword / parameter equals
* E302: Two blank lines between definition of runtions.
* E501: line too long (80 > 79 characters)
* E711 comparison to None should be "if cond is None:"
Merge pull request #1941 from halton/make_apk

[Android] Fix some PEP8 errors.