离子应用程序在打开时连续显示白屏

Question

I have developed one ionic app which works fine before June 15,2019. After that it continuously shows white screen after splash.Lazy loading is implemented in app.

I tried below steps for building apk

ionic cordova platform rm android
ionic cordova platform add android@8.0.0 
ionic cordova plugin add cordova-plugin-androidx 
ionic cordova plugin add cordova-plugin-androidx-adapter
cordova plugin add cordova-android-support-gradle-release --save

Terminal log of app on android studio is as below

07-26 12:12:45.241 19749-19799/io.ionic.starter E/libEGL: validate_display:255 error 3008 (EGL_BAD_DISPLAY) 07-26 12:12:45.521 19749-19782/io.ionic.starter E/AndroidProtocolHandler: Unable to open asset URL: file:///android_asset/www/lib/ngCordova/dist/ng-cordova.min.js 07-26 12:12:45.536 19749-19804/io.ionic.starter E/AndroidProtocolHandler: Unable to open asset URL: file:///android_asset/www/lib/ion-autocomplete/dist/ion-autocomplete.js 07-26 12:12:45.536 19749-19804/io.ionic.starter E/AndroidProtocolHandler: Unable to open asset URL: file:///android_asset/www/lib/ion-autocomplete/dist/ion-autocomplete.css 07-26 12:12:45.541 19749-19782/io.ionic.starter E/AndroidProtocolHandler: Unable to open asset URL: file:///android_asset/www/js/Calendar.js 07-26 12:12:50.181 19749-19749/io.ionic.starter E/ViewRootImpl: sendUserActionEvent() mView == null

Please help me

Answer 1

1. remove android platform using

2. ionic cordova platform rm android remove manually node-modules and package-lock.json (imp*)

3. npm cache clean --force

4. finally run npm i

5. ionic cordova build android

Answer 2

Try to debug app in browser and check developer console for error -

ionic cordova run browser

if there is no browser platform then you need to add platform like this-

ionic platform add browser

Answer 3

Its happen only when you have an error or any librabry missing in your componant file.you can see console.log for error.if something missing added its showing the content.

Before any project start you must run this command in root of project

    npm install

then use

    ionic serve

and other answer if using this prefrence in your config.xml so please remove this line which i mantion here

 <preference name="CordovaWebViewEngine" value="CDVUIWebViewEngine" />