Android NDK JNI warning:illegal start byte 0x

Today solves the problem of Jni warning:illegal start byte 0x81;

The problem occurs when the encryption method is called via JNI, and the ciphertext content is returned after the call, resulting in this problem.

After looking for a period of time abroad, the problem arises because the char * data requirements used by the Newstringutf method are visible, so that the data does not return properly;

So generally for us, when using the NDK encryption, encrypted ciphertext if it is not visible characters, then you need to do a BASE64 encoding data, the return string.

or use byte directly to return to the upper layer;