ETH(实现Etherscan的eventlog)

例如：
https://etherscan.io/tx/0xc9ed903d7e5295e973b0c7b58d98a6c2ff06b0b8edef721f6d702a8bf7c4864e#eventlog

eventlog

1.获取一笔交易的logs

public void getTransactionReceipt(View view) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                String hash = "0xc9ed903d7e5295e973b0c7b58d98a6c2ff06b0b8edef721f6d702a8bf7c4864e";

                try {
                    EthGetTransactionReceipt ethGetTransactionReceipt = mWeb3j.ethGetTransactionReceipt(hash).sendAsync().get();
                    TransactionReceipt receipt = ethGetTransactionReceipt.getTransactionReceipt();
                    String raw = ethGetTransactionReceipt.getRawResponse();
                    List<org.web3j.protocol.core.methods.response.Log> list = receipt.getLogs();
                    for(org.web3j.protocol.core.methods.response.Log log : list){
                        Log.e("test", "MainActivity getTransactionReceipt log = " + log);
                    }
                } catch (ExecutionException e) {
                    e.printStackTrace();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }

其中一个log输出

{
    removed=false, 
    logIndex='0x1a',  //26
    transactionIndex='0x32', 
    transactionHash='0xc9ed903d7e5295e973b0c7b58d98a6c2ff06b0b8edef721f6d702a8bf7c4864e', 
    blockHash='0xcbc4ec88129a9a851f4067ef37f079275ae7765a0e7b2c17a33b4c5009df2b77', 
    blockNumber='0x619c16', 
    address='0x0e0989b1f9b8a38983c2ba8053269ca62ec9b195', 
    data='0x000000000000000000000000000000000000000000000000000003ce683d7122', 
    type='null', 
    topics=[0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef, 
            0x0000000000000000000000001adeed31039138b6197b7da8fe8acbc1885c936a, 
                    0x000000000000000000000000f20b9e713a33f61fa38792d2afaf1cd30339126a]
}

2.解析abi，通过第一步的topics[0]获取event的name

代码：https://github.com/plaichat1986/Ett_Demo/blob/master/src/com/laurel/eth/abi/Test.java

event.name

private void handleEventEntry(Abi.Entry entry, String signagure) {
    if(entry.type == Abi.Entry.Type.event) {
        List<Abi.Entry.Param> paramList = entry.inputs;
        for(Abi.Entry.Param param : paramList) {
            System.out.println("param.name = " + param.name);
        }
        System.out.println("entry.formatSignature = " + entry.formatSignature()); //对应topics[0]
        System.out.println("test entry.name = " + entry.name + ", signagure = " + signagure);
        System.out.println("          ");
    }
}

3.topics[0]的解释

event的Keccak-256哈希值

fingerprintSignature