Google Code-in

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We have a lot of constants: log tags, preference keys, activity result keys and whatnot. In some places these constants are hardcoded.

Remove at least 30 hard coded strings and replace them with a constant Group constants that are of the same kind (all Preference Keys for example) and move them to a separate class (create a new package called constants for that). For example:

zimFile = getIntent().getStringExtra("zim_file");

Replace the hardcoded "zim_file" with a constant. Some already have a constant, and some are duplicated throughout multiple files.