White screen after splash screen in Ionic2 - ionic2

Question

I have small problem with white screen after execute splash screen when I convert my application to *.apk, Its take 20 to 25 seconds then my application run fine.
So is there any settings or codes or any tools that solves this problem?
Notes
~ Application size : 19mb
~ Tested on Samsung galaxy J7 2016 - android 7.0
~ I used this way to convert my app to apk : How to generate ionic apk or ios without extra applications?

Answer 1

by using
ionic build android --prod
The boot time will reduced to like 5 seconds and for the white screen,
the issue was Splash screen autohiding, so disable the splash screen auto hide and from
app.component.ts
i hid it manually.
config.xml
<preference name="SplashMaintainAspectRatio" value="true"/>
<preference name="SplashScreen" value="screen"/>
<preference name="SplashScreenDelay" value="30000"/>
<preference name="AutoHideSplashScreen" value="false"/>
<preference name="SplashShowOnlyFirstTime" value="false"/>
<preference name="FadeSplashScreen" value="false"/>
app.component.ts
import { Component } from '#angular/core';
import { Platform } from 'ionic-angular';
import { StatusBar } from '#ionic-native/status-bar';
import { SplashScreen } from '#ionic-native/splash-screen';
#Component({
templateUrl: 'app.html'
})
export class MyApp {
rootPage:string = 'HomePage';
constructor(platform: Platform, statusBar: StatusBar, splashScreen: SplashScreen) {
platform.ready().then(() => {
// Okay, so the platform is ready and our plugins are available.
// Here you can do any higher level native things you might need.
statusBar.styleDefault();
splashScreen.hide();
});
}
}

Answer 2

To build your apk file just use:
ionic build android
(or) ionic cordova build android (In ionic3)
To run your app in device just use:
ionic run android (ionic cordova run android)
(or) ionic run android --livereload (for live reload) (ionic cordova run android --livereload)
See more about ioni cli
20s launch app is normal with debug mode. Run ionic build with --prod varible, you will see your app launch much faster but it take more time to build.