1、确认apk签名方法：jarsigner -verify -verbose -certs ${your_apk}>log.txt
2、给apk签名：
java -jar out/host/linux-x86/framework/signapk.jar build/target/product/security/platform.x509.pem build/target/product/security/platform.pk8 test.apk test_signed.apk
ps:platform.x509.pem和platform.pk8为系统签名
