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out/host/linux-x86/framework/signapk.jar --> 签名工具
build/target/product/security/platform.x509.pem --> 系统密钥相关
build/target/product/security/platform.pk8 --> 系统密钥相关
app-release-unsigned.apk --> 你生成的未签名apk
置于同级目录,使用下面的语句生成系统签名app
java -jar signapk.jar platform.x509.pem platform.pk8 app-release-unsigned.apk output.apk
安装后你的app属于system_app权限组
3. 对底层的控制指的是? --> 如果是设备节点之类的请参考链接
http://blog.csdn.net/yelangjueqi/article/details/46761987