Changing the app's icons

• Open app/src/main/res
• You can find folders named mipmap-mdpi, mipmap-hdpi, mipmap-xhdpi, mipmap-xxhdpi and mipmap-xxxhdpi
• You have to put different dimension of your app's icon in these folders. Icon's name will be ic_launcher.png

The following list describes it better

• mipmap-mdpi : ic_launcher.png with dimension of 48x48px.
• mipmap-hdpi : ic_launcher.png with dimension of 72x72px.
• mipmap-xhdpi : ic_launcher.png with dimension of 96x96px.
• mipmap-xxhdpi : ic_launcher.png with dimension of 144x144px.
• mipmap-xxxhdpi : ic_launcher.png with dimension of 192x192px.

Splash Screen Icon

• Make an image file named ic_splash_screen.png and paste it inside app/src/main/res/drawable-nodpi folder (replacing the existing file)
• Dimension should be 576x576
• Now the image will be shown in your app's splash screen