1、在app--->build.gradle--->android{}下配置签名参数，如下：

android{
    signingConfigs{
        phonerelease{
            keyAlias 'androidsign'
            keyPassword 'android'
            storeFile file(project.property('phone.sign.path'))
            storePassword 'android'
        }

        padrelease{
            keyAlias 'androidsign'
            keyPassword 'android'
            storeFile file(project.property('pad.sign.path'))
            storePassword 'android'
        }
    }

}

2、在app--->build.gradle--->android{}下配置渠道，并将签名的参数配置在渠道中，如下：

android{
    

    flavorDimensions 'project'
    productFlavors{
        PHONE{
            signingConfig signingConfig.phoneRelease    
        }
        PAD{
            signingConfig signingConfig.padRelease    
        }
    }

}

3、在gradle.properties文件下添加签名路径：

phone.sign.path=D:\\signPath\\phone\\mykeystore.jks

pad.sign.path=D:\\signPath\\pad\\mykeystore.jks

4、在AS右上角gradle工具--->Tasks--->build 下点击assemble 编译打包脚本，可生成PAD和PHONE渠道两个不同签名的APK