A brief analysis of how to modify the application signature in uniapp

With the increasing popularity of mobile application development, some developers have begun to use uniapp for cross-platform development. For the Android platform, the signature of an application is very important because it identifies the uniqueness and security of the application. However, sometimes we need to modify the application signature, such as re-signing when refactoring the project, or publishing the application to other app stores, etc. Today I will introduce how to modify the application signature in uniapp.

Required conditions for modifying application signature

Before starting to modify, we need to prepare the necessary conditions:

• JDK (Java Development Kit): Due to Android Development requires a Java environment, so JDK needs to be installed. If you have not installed it yet, please install JDK first and configure the JAVA_HOME and PATH environment variables.
• Here I am using Uni-app’s HBuilderX development tool, so I also need to download and install the Android SDK and Gradle plug-in. If you have installed Android Studio, you can use the Android SDK directly.

Generate keystore file

Keystore is a file used by the Android system to verify application signatures. It can be understood as the ID card of the application. We need to generate it and save it.

1. Open the HBuilderX development tool and create a uniapp project.
2. Open a terminal or command line window in the project root directory and enter the following command:

keytool -genkey -alias [alias] -keyalg RSA -keysize 2048 -validity 10000 -keystore [keystore_file_name].jks

where [alias] is an alias to distinguish other certificates and can be named arbitrarily ; [keystore_file_name] is the name of the generated keystore file. It can be named arbitrarily, but you need to remember its saving location.

3. Fill in some information according to the prompts, such as password, name, organization and other information.

请输入密钥库口令: 123456
再次输入新口令: 123456
您的名字与姓氏是什么?
  [Unknown]:  huber
您的组织单位名称是什么?
  [Unknown]:  huber
您的组织名称是什么?
  [Unknown]:  huber
您所在的城市或区域名称是什么?
  [Unknown]:  huber
您所在的省/市/自治区名称是什么?
  [Unknown]:  huber
该单位的双字母国家/地区代码是什么?
  [Unknown]:  huber
CN=huber, OU=huber, O=huber, L=huber, ST=huber, C=huber是否正确?
  [否]:  Y

4. After entering "Y", a keystore file will be generated and saved to the specified directory.

Modify application signature

Before proceeding to the next step, you need to ensure that the project is successfully built and the application has been packaged in APK format. Next, we need to perform the following steps to sign:

1. Open the APK package, find the META-INF folder, and delete the CERT.RSA, CERT.SF and MANIFEST.MF files inside.
2. Find the build.gradle file in the application directory and add the following code to it:

android {
    signingConfigs {
        release {
            storeFile file('[keystore_file_name].jks') // keystore文件路径
            storePassword '[store_password]' // keystore文件密码
            keyAlias '[alias]' // 别名
            keyPassword '[key_password]' // 别名密码
        }
    }

    buildTypes {
        release {
            signingConfig signingConfigs.release
        }
    }
}

Note: You need to add [keystore_file_name], [store_password], [alias] and [key_password ] with your own information.

3. Click the "Release" button on the HBuilderX toolbar to sign. If the signature is successful, you will see the prompt "BUILD SUCCESSFUL" and the signature success message in the output information.

Package and publish

The last step is to package and publish the signed application to the app store or for testing. If you need to publish your app to the app store, please make sure:

• Each app package uses a different app name and version number.
• The application package has passed all security inspections and functional tests.

If you need to install the application on the device for testing, you need to copy the signed application package to the Android device for installation testing. It is recommended that each version of the application be adequately tested to ensure the healthy operation of the application.

Summary

Through the above steps, we have successfully completed the steps to modify the application signature in uniapp. During the development process, the correctness of the signature is very important because it is related to the security and reliability of the application. If you encounter problems when signing, you can consult and communicate through official documents or the community. Keep up the good work and make better applications!

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