"Ionic 4 应用程序未在 Android 9 和低于 7 的 Android 版本中运行"

Question

I am working on ionic 4 project when i build my project for uploading on playstore i faced some issues. I add latest android platform in ionic app and build my app but when i run my app it only run on some specific versions of android like 7.1 and 8.0. App is not working on android 9 and Android version lower the 7.

Ionic:

   Ionic CLI                     : 5.2.0 (C:\Users\Muhammad Yaseen\AppData\Roaming\npm\node_modules\ionic)
   Ionic Framework               : @ionic/angular 4.4.2
   @angular-devkit/build-angular : 0.13.9
   @angular-devkit/schematics    : 7.3.9
   @angular/cli                  : 7.3.9
   @ionic/angular-toolkit        : 1.5.1

Cordova:

   Cordova CLI       : 9.0.0 (cordova-lib@9.0.1)
   Cordova Platforms : android 8.0.0
   Cordova Plugins   : cordova-plugin-ionic-keyboard 2.1.3, cordova-plugin-ionic-webview 4.1.1, (and 7 other plugins)

Utility:

   cordova-res : 0.5.2
   native-run  : not installed

System:

   Android SDK Tools : 26.1.1 (C:\Users\Muhammad Yaseen\AppData\Local\Android\Sdk)
   NodeJS            : v10.15.3 (C:\Program Files\nodejs\node.exe)
   npm               : 6.9.0
   OS                : Windows 10

Answer 1

Try adding android:usesCleartextTraffic="true" to the <application> in the AndroidManifest.xml or as below using config.xml

<platform name="android">
  <edit-config file="app/src/main/AndroidManifest.xml" mode="merge" target="/manifest/application">
      <application android:usesCleartextTraffic="true" />
  </edit-config>
</platform>

Answer 2

Did you manage to solve the issue? Because I am facing the same issue with new android versions, when trying to post or get data using http, it keeps loading with progress bar and nothing happens. Any solution?