I have used schildbach/bitcoin-wallet, which uses bitcoinj. I have rewritten bitcoinj so it works on blackcoin.
If you encounter bugs please answer me on reddit
bitcoinj is very good written, they cleaned it last year, I have learned so much from it
It doesn't stake, I will work on that when I finish porting multibitHD, it looks like TREZOR should work too.
rat4: "we don't need the whole chain, next major update will prune like bitcoin"
so not yet ;P
I am waiting for this rellease too, than I be able to create wallet for 8 different platforms(mac,win, win-phone, android, ios, chrome-ext, openbsd, linux..)
and I forgot chain now needs only UTXO's and last 500 blocks to stake, so I have removed all others
It can be less than 200mb,
because that's a chain in H2MVStore
http://www.h2database.com/html/mvstore.htmland I store some other additional info... for bitcoinj