网址：

https://square.github.io/retrofit/

https://github.com/square/retrofit/
 https://www.jianshu.com/p/81754adcd4ae

android jdk8使用

implementation 'org.bouncycastle:bcprov-jdk15on:1.70'

报异常：

java.security.NoSuchAlgorithmException: Provider BC does not provide SM4/CBC/PKCS5Padding

generateSm4EcbCipher 替换成它

private Cipher generateSm4EcbCipher(String sm4Name, int sm4Mode, byte[] sm4Key) throws NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException {//        Cipher cipher = Cipher.getInstance(sm4Name, BouncyCastleProvider.PROVIDER_NAME);Cipher cipher = Cipher.getInstance(sm4Name, new BouncyCastleProvider());Key secretKey = new SecretKeySpec(sm4Key, SM4_NAME);IvParameterSpec ivParameterSpec = new IvParameterSpec(SM4_KEY_IV);try {cipher.init(sm4Mode, secretKey, ivParameterSpec);} catch (InvalidKeyException | InvalidAlgorithmParameterException e) {e.printStackTrace();}return cipher;}