区块链钱包-android篇

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​ 1:使用Protocol Buffers  首先根目录gradle中添加依赖:

classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.3"

 然后项目文件中添加plugin,添加依赖包:

apply plugin: 'com.google.protobuf'

protobuf { protoc { artifact = 'com.google.protobuf:protoc:3.6.1' } plugins { javalite { artifact = "com.google.protobuf:protoc-gen-javalite:3.0.0" } grpc { artifact = 'io.grpc:protoc-gen-grpc-java:1.17.1' } } generateProtoTasks { all().each { task -> task.plugins { javalite {} grpc { // Options added to --grpc_out option 'lite' } } } } configurations { all*.exclude group: 'com.android.support', module: 'support-v13' } }

dependencies { api 'io.grpc:grpc-okhttp:1.17.1' api 'io.grpc:grpc-protobuf-lite:1.17.1' api 'io.grpc:grpc-stub:1.17.1' }  最后main下添加proto路径,添加proto文件;

 

2:tron基础类        关于tron的基础类,我整理了个lib,使用时直接导入lib即可。

       主要包括wallet钱包类,管理类等内容。

       

 这里我主要贴出wallet的代码

package org.tron.walletserver;

import android.os.Build; import android.support.annotation.RequiresApi;

import org.tron.common.crypto.ECKey; import org.tron.common.utils.Utils;

import java.math.BigInteger;

public class Wallet { private ECKey mECKey = null;

private boolean isWatchOnly = false;
private boolean isColdWallet = false;
private String walletName = "";
private String encPassword = "";
private String address = "";
private byte[] encPrivateKey;
private byte[] publicKey;


public Wallet() {
}

public Wallet(boolean generateECKey) {
    if(generateECKey) {
        mECKey = new ECKey(Utils.getRandom());
    }
}

@RequiresApi(api = Build.VERSION_CODES.KITKAT)
public Wallet(String privateKey) {
    setPrivateKey(privateKey);
}

public boolean isOpen() {
    return mECKey != null && mECKey.getPrivKeyBytes() != null;
}

@RequiresApi(api = Build.VERSION_CODES.KITKAT)
public boolean open(String password) {
    if(encPrivateKey != null) {
        setPrivateKey(AddressUtils.decryptPrivateKey(encPrivateKey, password));
        return isOpen();
    } else {
        return false;
    }
}

public byte[] getPublicKey() {
    return mECKey != null ? mECKey.getPubKey() : publicKey;
}

public void setPublicKey(byte[] publicKey) {
    this.publicKey = publicKey;
}

public byte[] getPrivateKey() {
    return mECKey != null ? mECKey.getPrivKeyBytes() : null;
}

@RequiresApi(api = Build.VERSION_CODES.KITKAT)
public void setPrivateKey(String privateKey) {
    if(privateKey != null && !privateKey.isEmpty()) {
        ECKey tempKey = null;
        try {
            BigInteger priK = new BigInteger(privateKey, 16);
            tempKey = ECKey.fromPrivate(priK);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        mECKey = tempKey;
    } else {
        mECKey = null;
    }
}


public boolean isWatchOnly() {
    return isWatchOnly;
}

public void setWatchOnly(boolean watchOnly) {
    isWatchOnly = watchOnly;
}

public boolean isColdWallet() {
    return isColdWallet;
}

public void setColdWallet(boolean coldWallet) {
    isColdWallet = coldWallet;
}

public String getWalletName() {
    return walletName;
}

public void setWalletName(String walletName) {
    this.walletName = walletName;
}

public String getEncryptedPassword() {
    return encPassword;
}

public void setEncryptedPassword(String password) {
    this.encPassword = password;
}

@RequiresApi(api = Build.VERSION_CODES.KITKAT)
public String getAddress() {
    if(mECKey != null) {
        return AddressUtils.encode58Check(mECKey.getAddress());
    }
    else if (publicKey != null){
        return AddressUtils.encode58Check(ECKey.fromPublicOnly(publicKey).getAddress());
    } else {
        return address;
    }
}

public void setAddress(String address) {
    this.address = address;
}

public ECKey getECKey() {
    return mECKey;
}

public byte[] getEncryptedPrivateKey() {
    return encPrivateKey;
}

public void setEncryptedPrivateKey(byte[] encPrivateKey) {
    this.encPrivateKey = encPrivateKey;
}

} 3:导入钱包      

     其实就一步操作,就是根据私钥 创建wallet对象。

//根据私钥创建钱包 Wallet wallet = new Wallet(privateKey); //设置钱包名称,我这里不需要就设置成钱包地址了。 wallet.setWalletName(wallet.getAddress()); //项目存储导入的钱包 TronManager.storeTron(wallet);

4:创建钱包        创建钱包需要两个参数,一个是钱包名称,一个是设置的密码,钱包名称还好,重要的是密码,因为转账,导出私钥助记词等信息时,都是需要密码验证的。

Wallet wallet = new Wallet(true); wallet.setWalletName(name); WalletManager.store(this,wallet, pwd); store方法是使用SharedPreferences存储当前钱包的信息,其中我们可以通过密码来获取wallet的eckey从而得到钱包的公钥和私钥。

5:钱包信息       这里主要用到项目中grpcClient类和walletmanager类。

      这个类主要封装了对应的网络请求以及钱包管理

       grpcClient类的initGrpc需要传入对应的fullnode和soliditynode,这个可以去下面的地址去选择,

   documentation/Official_Public_Node.md at master · tronprotocol/documentation · GitHub

 查询账户需要用到账户的地址:

Protocol.Account account = WalletManager.queryAccount(address, false); GrpcAPI.AccountNetMessage accountNetMessage = WalletManager.getAccountNet(address); GrpcAPI.AccountResourceMessage accountResMessage = WalletManager.getAccountRes(address);   account可以查询balance和FrozenList;

  accountNetMessage 可以查询账户的带宽信息。

具体代码如下:

double balance=mAccount.getBalance()/1000000.0d; binding.tvWalletAccount.setText(balance+"");

        long frozenTotal = 0;
        for(Protocol.Account.Frozen frozen : mAccount.getFrozenList()) {
            frozenTotal += frozen.getFrozenBalance();
        }
        binding.tvWalletTronWeight.setText((frozenTotal/1000000)+"");

        GrpcAPI.AccountNetMessage accountNetMessage = TronUtil.getAccountNet(getActivity(), wallet.getWalletName());

        long bandwidth = accountNetMessage.getNetLimit() + accountNetMessage.getFreeNetLimit();
        long bandwidthUsed = accountNetMessage.getNetUsed()+accountNetMessage.getFreeNetUsed();
        long bandwidthLeft = bandwidth - bandwidthUsed;

        binding.tvWalletBandwidth.setText(bandwidthLeft+"");

 

6:转账           

byte[] toRaw; try { toRaw = WalletManager.decodeFromBase58Check(sendAddress); } catch (IllegalArgumentException ignored) { Toast.makeText(this,"请输入一个有效地址",Toast.LENGTH_SHORT).show(); return; }

    double amount=Double.parseDouble(sendAmount);
    Contract.TransferContract contract = WalletManager.createTransferContract(toRaw, WalletManager.decodeFromBase58Check(mWallet.getAddress()), (long) (amount * 1000000.0d));
    Protocol.Transaction transaction = WalletManager.createTransaction4Transfer(contract);
    byte[]  mTransactionBytes = transaction.toByteArray();
    try {
        mTransactionUnsigned = Protocol.Transaction.parseFrom(mTransactionBytes);
    } catch (InvalidProtocolBufferException e) {
        e.printStackTrace();
    }

根据上面的代码,获取到mTransactionUnsigned ,然后输入密码校验密码并获取到wallet的eckey。

设置时间戳,交易签名。

mTransactionSigned = TransactionUtils.setTimestamp(mTransactionUnsigned); mTransactionSigned = TransactionUtils.sign(mTransactionSigned, mWallet.getECKey()); WalletManager.broadcastTransaction(mTransactionSigned); 最后一步是广播交易。

具体的代码可查看git。

git地址

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