Use a square logo of at least 512 × 512 pixels for the icon, keep the important part inside the middle 70% (Android crops icons into circles and squircles), pick a theme colour from your brand with good contrast, and keep the splash short and simple.
The icon
- Square, 512 × 512 or larger, PNG. The builder makes every size Android needs from it.
- Keep a safe margin. Phones mask icons into different shapes; a logo that touches the edges gets clipped.
- Simple wins. A single mark reads at 48 pixels; a full wordmark does not.
- Use the same icon for your Google Play listing (Play asks for 512 × 512).
The theme colour
The theme colour tints the status bar and the page loader. Use your main brand colour, and make sure white text on it is readable — a contrast ratio of at least 4.5:1. Very light colours make the status bar icons hard to see.
The splash screen
The splash shows your logo on a background colour while the first page starts loading. Keep it to the logo on a plain colour, choose a loader if you like, and let the page take over as soon as it is ready — a splash that lingers feels like a slow app, not a polished one.
Intro screens
Up to five screens shown on first launch only, each with an image, a title and a line of text. Use them for what someone needs before they start: what the app does, why notifications are useful, how to sign in.