[Ionic v4] Blank screen when running tabs project on Android without changing code

Bug Report

Ionic Info Run ionic info from a terminal/cmd prompt and paste the output below.

Ionic:

   ionic (Ionic CLI)          : 4.0.1 (/usr/local/lib/node_modules/ionic)
   Ionic Framework            : @ionic/angular 4.0.0-beta.0
   @angular-devkit/core       : 0.7.0-rc.3
   @angular-devkit/schematics : 0.7.0-rc.3
   @angular/cli               : 6.0.8
   @ionic/ng-toolkit          : 1.0.0
   @ionic/schematics-angular  : 1.0.1

Cordova:

   cordova (Cordova CLI) : 7.1.0
   Cordova Platforms     : android 6.3.0

System:

   ios-deploy : 1.9.2
   ios-sim    : 5.1.0
   NodeJS     : v9.9.0 (/usr/local/bin/node)
   npm        : 6.2.0
   OS         : macOS Sierra
   Xcode      : Xcode 9.2 Build version 9C40b

Environment:

   ANDROID_HOME : not set

Describe the Bug Unable to build Android app from tabs starter

Steps to Reproduce Steps to reproduce the behavior:

This works and shows the app running in my browser

ionic start myApp tabs --type=angular
cd myApp/
ionic serve

When running:

ionic cordova run android

With my Android device connected via usb I got a white screen. The console of the Android device gives:

styles.cc30f1d5d0942874a01d.css:1 Failed to load resource: net::ERR_FILE_NOT_FOUND
runtime.5102c7f106242716eaa7.js:1 Failed to load resource: net::ERR_FILE_NOT_FOUND
cordova.adc5592093abc0bc2eb2.js:1 Failed to load resource: net::ERR_FILE_NOT_FOUND
polyfills.17fd7534d20949996e6f.js:1 Failed to load resource: net::ERR_FILE_NOT_FOUND
main.16f37d6c80ab0ae66681.js:1 Failed to load resource: net::ERR_FILE_NOT_FOUND
/assets/icon/favicon.png:1 Failed to load resource: net::ERR_FILE_NOT_FOUND

Expected Behavior To see the tabs app running on the device

[marcelocanales]

Finally I solved the problem by updating the Android System Webview in my Android 6. However, I believe that the ionic code could be transpilated to an previous version of ECMAScript or avoid the use of features not compatible with the old versions of Android System Webview, for example, async functions , to offer compatibility with previous versions of the Android System Webview, since this is independent of the Android version.

I would like to point out that I did tests with Vanilla Apache Cordova and I did not have problems with the old Android System Webview. Ionic should do the same.

[basvdijk]

@matheusdavidson Great! So basically somehow an old cordova-android version is injected in the package.json during the setup phase of the project when Android is added.