using keystore android. targeting version 18 and above. have to use deprecated method calls?

Question

I am developing an app using the Android KeyStore API calls to encrypt some string values. I am targeting API level 18 and upwards. I have a an if else block in my code which targets API levels 18 up to 23. My problem is that I either have to use deprecated method calls in the block with (shown below is my if block)

if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2 &&
            Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {

       KeyPairGenerator kpg = KeyPairGenerator.getInstance(
        KeyProperties.KEY_ALGORITHM_EC, "AndroidKeyStore");

       kpg.initialize(new KeyPairGeneratorSpec.Builder(alias, keyProperties.PURPOSE_SIGN | KeyProperties.PURPOSE_VERIFY)
       .setDigests(KeyProperties.DIGEST_SHA256,KeyProperties.DIGEST_SHA512)
       .build());

       KeyPair kp = kpg.generateKeyPair();
     }

this appears with a line through it in the IDE as the method call is deprecated. But, it does target the api levels this code was built to run on?

If I change over to KeyGenParameterSpec.builder() I get a compile time error because this object can only be used on API level 23 and above. My app targets API level 18 and above?

Is there a way to generate a key pair entry in my KeyStore without using the deprecated method calls or having to move to API level 23 and above?

Thanks in advance!

Answer 1

Just include an else block with the new API level 23 code so you can do it both ways!

if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2 &&
            Build.VERSION.SDK_INT < Build.VERSION_CODES.M){
    // deprecated code on 23
}else{
    // new code for 23+
}