Ah, that's another one we can't do at the moment - iOS has built-in support for decoding PDF, Word, and RTF files that we can hook into, while Android doesn't. And the only PDF decoder library for Android we've found that does a respectable job with Chinese text charges a *huge* license fee (lot of money up front plus a percentage of all of the money we make from our Android app, even outside of the document reader) that simply wouldn't be covered by the extra sales PDF reading support would generate for us.