A simple android implementation of Ethereum wallet and smart contracts interaction.

First, add the following dependencies to your project:

<dependency>
  <groupId>org.web3j</groupId>
  <artifactId>core-android</artifactId>
  <version>2.2.1</version>
</dependency>

compile ('org.web3j:core-android:2.2.1')

This will run a private network. You may also run it with --testnet flag.

$ geth --dev --rpc --rpcapi "eth,net,web3,personal"  --rpcaddr="localhost" --rpcport="8545" --rpccorsdomain="*"