splash screen resolution app.json
"splash": {
"backgroundColor": "#ffffff",
"ldpi": "./assets/img/splashscreen.png",
"mdpi": "./assets/img/splashscreen.png",
"hdpi": "./assets/img/splashscreen.png",
"xhdpi": "./assets/img/splashscreen.png",
"xxhdpi": "./assets/img/splashscreen.png",
"xxxhdpi": "./assets/img/splashscreen.png",
"resizeMode": "contain"
}