Ionic 4 icons not showing in android device

Ion icons seems to be not showing in android device.here is my packege.json

{
“name”: “test”,
“version”: “0.0.1”,
“author”: “Ionic Framework”,
“homepage”: “http://ionicframework.com/”,
“scripts”: {
“ng”: “ng”,
“start”: “ng serve”,
“build”: “ng build”,
“test”: “ng test”,
“lint”: “ng lint”,
“e2e”: “ng e2e”
},
“private”: true,
“dependencies”: {
@angular/common”: “^7.2.2”,
@angular/core”: “^7.2.2”,
@angular/forms”: “^7.2.2”,
@angular/http”: “^7.2.2”,
@angular/platform-browser”: “^7.2.2”,
@angular/platform-browser-dynamic”: “^7.2.2”,
@angular/router”: “^7.2.2”,
@ionic-native/camera”: “^5.3.0”,
@ionic-native/core”: “^5.0.0”,
@ionic-native/device”: “^5.5.0”,
@ionic-native/document-viewer”: “^5.4.0”,
@ionic-native/file”: “^5.0.0-beta.21”,
@ionic-native/file-opener”: “^5.0.0-beta.21”,
@ionic-native/file-transfer”: “^5.4.0”,
@ionic-native/in-app-browser”: “^5.2.0”,
@ionic-native/keyboard”: “^5.2.0”,
@ionic-native/ms-adal”: “^5.2.0”,
@ionic-native/network”: “^5.4.0”,
@ionic-native/splash-screen”: “^5.0.0”,
@ionic-native/status-bar”: “^5.0.0”,
@ionic-native/toast”: “^5.2.0”,
@ionic/angular”: “^4.3.1”,
@ionic/storage”: “^2.2.0”,
@okta/okta-angular”: “^1.2.0”,
@okta/okta-auth-js”: “^2.3.1”,
“angular-oauth2-oidc”: “^5.0.2”,
“cordova-android”: “7.1.4”,
“cordova-ios”: “4.5.5”,
“cordova-plugin-camera”: “4.0.3”,
“cordova-plugin-compat”: “^1.2.0”,
“cordova-plugin-device”: “^2.0.2”,
“cordova-plugin-document-viewer”: “^0.9.10”,
“cordova-plugin-file”: “^6.0.1”,
“cordova-plugin-file-opener2”: “^2.0.19”,
“cordova-plugin-file-transfer”: “^1.7.1”,
“cordova-plugin-inappbrowser”: “3.0.0”,
“cordova-plugin-ionic-keyboard”: “^2.1.3”,
“cordova-plugin-ionic-webview”: “^3.1.2”,
“cordova-plugin-ms-adal”: “^0.10.2”,
“cordova-plugin-network-information”: “^2.0.1”,
“cordova-plugin-splashscreen”: “^5.0.2”,
“cordova-plugin-statusbar”: “^2.4.2”,
“cordova-plugin-whitelist”: “^1.3.3”,
“cordova-plugin-x-toast”: “2.7.2”,
“cordova-sqlite-storage”: “3.1.0”,
“core-js”: “^2.5.4”,
“guid-typescript”: “^1.0.9”,
“ng2-pdf-viewer”: “^5.2.3”,
“ngx-logger”: “^3.3.12”,
“number-flip”: “^1.0.28”,
“rxjs”: “~6.3.3”,
“zone.js”: “~0.8.29”
},
“devDependencies”: {
@angular-devkit/architect”: “~0.12.3”,
@angular-devkit/build-angular”: “~0.13.0”,
@angular-devkit/core”: “~7.2.3”,
@angular-devkit/schematics”: “~7.2.3”,
@angular/cli”: “~7.3.1”,
@angular/compiler”: “~7.2.2”,
@angular/compiler-cli”: “~7.2.2”,
@angular/language-service”: “~7.2.2”,
@ionic/angular-toolkit”: “~1.4.0”,
@ionic/lab”: “1.0.24”,
@types/jasmine”: “~2.8.8”,
@types/jasminewd2”: “~2.0.3”,
@types/node”: “~10.14.2”,
“codelyzer”: “~4.5.0”,
“jasmine-core”: “~2.99.1”,
“jasmine-spec-reporter”: “~4.2.1”,
“karma”: “~3.1.4”,
“karma-chrome-launcher”: “~2.2.0”,
“karma-coverage-istanbul-reporter”: “~2.0.1”,
“karma-jasmine”: “~1.1.2”,
“karma-jasmine-html-reporter”: “^0.2.2”,
“protractor”: “~5.4.0”,
“ts-node”: “~8.0.0”,
“tslint”: “~5.12.0”,
“typescript”: “~3.1.6”
},
“description”: “An Ionic project”,
“cordova”: {
“plugins”: {
“cordova-plugin-whitelist”: {},
“cordova-plugin-statusbar”: {},
“cordova-plugin-device”: {},
“cordova-plugin-splashscreen”: {},
“cordova-plugin-ionic-webview”: {},
“cordova-plugin-ionic-keyboard”: {},
“cordova-plugin-ms-adal”: {},
“cordova-plugin-document-viewer”: {},
“cordova-plugin-file”: {},
“cordova-plugin-file-opener2”: {},
“cordova-plugin-inappbrowser”: {},
“cordova-sqlite-storage”: {},
“cordova-plugin-x-toast”: {},
“cordova-plugin-camera”: {},
“cordova-plugin-network-information”: {},
“cordova-plugin-file-transfer”: {}
},
“platforms”: [
“ios”,
“android”
]
}
}