There are quite a few bitcoin wallets on Android, some of them I would like to note - BitPay, this wallet makes it difficult to track your balances using address rotation. You need to use a new Bitcoin address every time you request payment. It does not support Tor in order to prevent attackers or ISPs from linking your payments to your IP address. The wallet will help you choose the appropriate commission for a transaction without overpayment. Bither, BLW, BRD, Eclair Mobile, Edge wallets are also very good.