QR Code Maker QR Code Generator Android App Source Code | Create & Share QR Codes | Offline

QR Code Maker is a complete QR code generator app for Android that runs 100% offline — no server, no accounts, no subscriptions and no internet permission at all. The QR codes are generated on the phone by a QR encoder written in pure Java that is included in full in this source package — there is no third-party QR library inside. Your users create a code in seconds: pick a content type, fill in the fields, and the scannable QR code appears instantly.

They can style it, choose the image size, save it to the gallery, share it, and re-open recent codes from the built-in history. WHAT THE USER DOES: 1. Pick a type: Text, Website URL, Phone Number, Email or Wi-Fi Network 2. Fill in the fields (the app builds the correct payload — tel:, mailto: with subject, and the standard WIFI: format with proper escaping) 3. Choose a colour (Black, Navy, Teal or Green) and a PNG size (512 / 1024 / 2048 px) 4.

Save the code to Pictures/QRMaker or share it anywhere. WHAT YOU GET: complete Java source code — plain Android SDK, zero external dependencies; the full QR encoder as readable source (QrCode.java): byte mode, error-correction level M, Reed-Solomon over GF(256), block interleaving, all 8 masks with spec penalty scoring, versions 1-10 (up to 213 characters), verified against an independent QR implementation and by decoding rendered codes with a standard decoder; easy to rebrand — app name, icon, colours, content types and save folder are each in one obvious place (documented in the buyer guide); one-command build script (no Gradle needed) + Android Studio import steps; buyer guide included.

REQUIREMENTS: JDK 17+ and Android SDK (build-tools 34.0.0, platform android-34) to build. The finished app runs on Android 7.0+ and is only about 126 KB. Perfect for publishing your own QR creator app, bundling with business / marketing toolkits, or reusing the dependency-free encoder class in a completely different app of your own.