https://www.cnblogs.com/gengzhaoyun/p/7607751.html apk增加系统签名的方法
https://blog.csdn.net/xiaoyi_tdcq/article/details/79272047 android系统签名
https://blog.csdn.net/chenzhen1080/article/details/78990353 如何获得系统权限--解决no conscrypt_openjdk_jni in java.library.path错误
java -Djava.library.path=. -jar signapk.jar platform.x509.pem platform.pk8 app.apk app_sign.apk