请教！关于AndroidStudio签名不正确的问题

[qshzf]

jDK版本1.6.0_10
AndroidStudio版本0.5.2

新建一个项目，不做任何改动。
build variants 设置release
generate signed apk新建key
passwork:xxxxx
alias:qsh
passwork:yyyyy
first and last name:qsh
organizational unit:qsh
organization:qsh
city or locality:lyg
state or province:js
country code(xx):cn
稍等提示完成。
run app （shift+F10）
编译成功，选择手机下载，出错！


Waiting for device.
Target device: lenovo-lenovo_a65-0123456789ABCDEF
Uploading file
local path: D:\android\cs2\app\build\apk\app-release-unsigned.apk
remote path: /data/local/tmp/com.qsh.cs2.app
Installing com.qsh.cs2.app
DEVICE SHELL COMMAND: pm install -r "/data/local/tmp/com.qsh.cs2.app"
pkg: /data/local/tmp/com.qsh.cs2.app
Failure [INSTALL_PARSE_FAILED_NO_CERTIFICATES]


Installation failed since the APK was either not signed, or signed incorrectly.
If this is a Gradle-based project, then make sure the signing configuration is specified in the Gradle build script.



没有签名？我中间少了步骤么？望大侠指点

[tcmakebest]

文件名app-release-unsigned.apk暴露了没签名的本质.

[qshzf]

问题是 怎样用AndroidStudio签名呢？