# Release 版打包 - Android版

## 1. 生成签名密钥

* 执行命令

  ```
  keytool -genkey -v -keystore 密钥库文件名.keystore -alias 密钥别名 -keyalg RSA -keysize 2048 -validity 10000
  ```
* 会提示输入密钥库口令、密钥口令，以及姓名、组织等发行信息，然后会生成名为`密钥库文件名.keystore`的密钥库文件，有效期10000天。
* 记住密钥库口令、密钥口令、密钥别名，后面会用到。
* 将密钥库文件放到`android/app`目录下。

## 2. 设置gradle变量

修改`android/gradle.properties`文件，增加如下配置：

```
MYAPP_RELEASE_STORE_FILE=密钥库文件名.keystore
MYAPP_RELEASE_KEY_ALIAS=密钥别名
MYAPP_RELEASE_STORE_PASSWORD=密钥库口令
MYAPP_RELEASE_KEY_PASSWORD=密钥口令
```

## 3. 在gradle配置中添加签名

修改`android/app/build.gradle`文件，做如下配置：

```
...
android {
    ...
    defaultConfig { ... }
    signingConfigs {
        release {
            storeFile file('密钥库文件名.keystore')
            storePassword '密钥库口令'
            keyAlias '密钥别名'
            keyPassword '密钥口令'
        }
    }
    buildTypes {
        release {
            ...
            signingConfig signingConfigs.release
        }
    }
}
...
```

## 4. 生成APK

* 进入`android`目录。
* 执行命令

  ```
  ./gradlew assembleRelease
  ```
* 生成的APK文件为`android/app/build/outputs/apk/app-release.apk`，注意每次打包前删除该APK文件，否则不会重新生成。

## 5. 打包脚本apk.sh

目前HWE、MNIS等工程已经做好相关配置并写了打包脚本，mac环境下只需更新整个工程后，在工程目录下执行`./apk.sh`，即可打包到工程的`07.Installation`目录下。今后工程也可以写同样的脚本，方便打包。

## 参考

* [打包APK - React Native 中文网](https://reactnative.cn/docs/0.51/signed-apk-android.html#content)
* [React Native安卓项目打包APK - 简书](https://www.jianshu.com/p/32a99c273be1)


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