What happens when uniapp fails to select pictures?

In recent years, mobile applications have become more and more popular in the market, and various apps are constantly emerging. As a cross-platform development framework, uniapp is widely loved by developers. However, during the development process using uniapp, many developers will encounter a major problem - failure to select pictures.

1. Problem description

When using the uni.chooseImage() method to select an image in uniapp, sometimes the selection fails. This situation is relatively common, but the causes vary. For example:

1. The user does not grant the application permission to access the photo album.

2. There is no photo album application in the device.

3. Runtime permission restrictions.

2. Solution

1. Authorize the application to access the photo album permission

Due to differences in Android versions and permission issues, developers need to consider whether they have already obtained the permission when using uniapp Album access. To solve this problem, you can authorize the application to access the album by using the uni.authorize() method in uni-app.

2. Add the logic code to obtain permissions

Before requesting permissions, we need to confirm whether the required permissions have been obtained. If not obtained, you need to request the corresponding permissions. The following is a sample code to request permission:

// 判断用户是否已经授权获取摄像头或相机，如未授权，则发起授权请求
uni.getSetting({
  success(settingRes) {
    if (!settingRes.authSetting['scope.camera']) {
      uni.authorize({
        scope: 'scope.camera',
        success() {
          console.log('相机授权成功')
        }
      })
    }
  }
})

3. Reinstall the photo album application in the device

If there is no photo album application in your device, you need to download and install it. In Android, users can download and install it through the Google Play Store.

4. Enhance fault tolerance and error handling

In order to enhance the fault tolerance and error handling capabilities of the application, we need more complete code. First, a warning can be issued to notify the user when a selection fails. Second, you can catch errors as they occur and handle them.

The following is a sample code:

uni.chooseImage({
  count: 1,
  success(res) {
    console.log('选择图片成功', res)
  },
  fail(err) {
    console.error('选择图片失败', err)
    uni.showToast({
      title: '选择失败',
      duration: 3000,
      icon: 'none'
    })
  },
  complete() {
    console.log('选择完成')
  }
})

5. Upgrade the uni-app version

If none of the above solutions work, then we can try to upgrade the uni-app version. In the new version, some previous problems may have been fixed.

3. Summary

In uniapp development, failure to select pictures is a very common problem, but the solutions vary depending on the situation. Developers can try to solve this problem by authorizing the application to access the photo album, adding logic code to obtain permissions, reinstalling the photo album application on the device, enhancing fault tolerance and error handling, upgrading the uniapp version, etc.

Finally, we should always pay attention to the official documentation and community of uniapp to learn the latest optimization techniques and solutions.

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