How to implement automatic updates in Uniapp applications

With the rapid development of mobile applications, millions of applications are launched from various app stores every day. Due to security issues and vulnerabilities, the operational stability of the application cannot be guaranteed. To address these issues, developers must update their applications frequently. This is one of the reasons why we implement automatic updates.

Uniapp is a multi-terminal development framework. Developers only need to write code once, and it can run on multiple platforms at the same time. This cross-platform development framework is quite valuable to developers. However, when we use Uniapp to develop applications, it is quite difficult to implement automatic updates. Therefore, this article will focus on how to implement automatic updates in Uniapp applications.

1. Implementation Principle

The principle of automatic update in Uniapp application is relatively simple. We need to send a request to the server side, get the version number of the application from the server side and then compare it with the version number of the application installed on the device. If the obtained version number is newer than the currently installed application version number, the user can be prompted to update and a download link is provided so that the user can easily download and use the new version of the application.

2. Implementation steps

1. Configure the manifest.json file in the public directory of the Uniapp project

Configure the corresponding appid and version

Sample code:

{
  "package": "com.example.uniapp",
  "name": "uni-app",
  "appid": "com.example.uniapp",
  "versionName": "1.0.0",
  "versionCode": "100"
}

2. Storing the version information of the application on the server side

The version information of the application can be stored in the database on the server side or in the configuration file. Developers only need to develop an API interface and obtain the latest version information of the application by accessing the API interface.

Sample code:

<?php
header(&#39;Content-Type: application/json;charset=UTF-8&#39;);
$data = array(
    &#39;name&#39; => 'uni-app',
    'version' => '2.0.0',
    'url' => 'http://example.com/uniapp.apk',
    'note' => '更新说明'
);
echo json_encode($data);
?>

3. Write front-end automatic update code

In Uniapp applications, developers can use the updates that come with uni-app Components to implement automatic updates. The update component has high compatibility and can intelligently determine the platform and automatically obtain the corresponding update package.

Sample code:

uni.getUpdateManager().onCheckForUpdate(function (res) {
  if (res.hasUpdate) {
    uni.showModal({
      title: '发现新版本',
      content: '是否进行更新？',
      success: function (res) {
        if (res.confirm) {
          uni.getUpdateManager().onUpdateReady(function () {
            uni.showModal({
              title: '更新提示',
              content: '新版本已经下载完成，是否立即更新？',
              success: function (res) {
                if (res.confirm) {
                  uni.getUpdateManager().applyUpdate();
                } else if (res.cancel) {
                  uni.showToast({
                    title: '放弃更新',
                    icon: 'none'
                  });
                }
              }
            });
          });
        }
      }
    });
  } else {
    uni.showToast({
      title: '已是最新版本',
      icon: 'none'
    });
  }
});

When the code is executed, we need to call the getUpdateManager function provided by uni-app to create an update object. Then listen to whether the application has a new version update through onCheckForUpdate. If there is a new version update, a prompt box will pop up asking whether to update. If the user clicks to confirm, the onUpdateReady function will be called to start downloading and updating the new version.

3. Summary

To implement automatic updates in the Uniapp application, we need to develop on the client and server respectively. By using the update component provided by Uni-app, we can implement the automatic update function on the client. By storing application version information on the server side, we can enable the client to obtain the latest version of the application in a timely manner. In this way, our applications can be guaranteed to run in the latest state, both from a security and stability perspective.

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