DroidStar

9M2PJU Mod

Android digital voice client for DMR, M17, YSF, P25 & NXDN

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📱System Requirements

DroidStar 9M2PJU runs on modern Android devices. No root access required.

Android 12+ (API 31) arm64-v8a ~48 MB APK No root needed

🔧Our Modifications

This is a modified build of Doug McLain's DroidStar, customized by 9M2PJU. The core engine and all protocols are kept in sync with upstream. Our changes focus on branding, visual polish, and Android-specific fixes:

Ham Radio Navy theme — deep navy (#0f1923) background with teal (#41cad2) accent matching the 9M2PJU logo. Tab bar with active indicator, card-based layout grouping on Main tab.
9M2PJU branding — app name, icon, splash screen, and About page customized with 9M2PJU identity and website link.
About page — 9M2PJU logo, build info, website link, and donation buttons (Buy Me a Coffee & PayPal).
Built-in vocoders — AMBE, Codec 2, and IMBE vocoders compiled directly into the APK. No external vocoder plugin download needed.
Android 15 fix — safe area handling for edge-to-edge mode so the PTT button and navigation are never hidden behind the system nav bar.
PTT button — large cyan rounded button that fills available space, turns dark red when transmitting. Press-and-hold to transmit, or enable TX toggle mode in Settings.
Portrait orientation — app locked to portrait mode for a consistent layout.
Release-signed APK — all builds are signed with a persistent release key, so you can update to new versions without uninstalling (no settings loss).
Custom app icon & splash — 9M2PJU logo with navy background on launcher icon and splash screen.
GitHub Actions CI — automated APK builds on every release tag.
Crash-proof error handling — comprehensive null pointer guards across all modes (DMR, M17, YSF, P25, NXDN). The app never exits on unexpected errors — it shows a user-friendly popup instead.
DMR connection retry & timeout — 3 retry attempts with timeout when connecting to a DMR master. Clear error popups for server rejection (MSTNAK), server shutdown (MSTCL), DNS failures, and unreachable hosts.

📝Credits & License

Original DroidStar by Doug McLain AD8DP. Modified and distributed by 9M2PJU.

Upstream: github.com/nostar/droidstar
License: GPL v3.0
Built with Qt 6.7.2 + NDK 27

Features

📡

Multiple Modes

DMR, M17, YSF, P25, NXDN plus DCS / XRF / REF / FCS / IAX reflectors.

🎤

Built-in Vocoders

AMBE, Codec 2 & IMBE compiled in — no external plugin download required.

🔋

USB Vocoder Support

Connect an external AMBE vocoder or MMDVM modem over USB serial.

👥

Operator Info

Auto-fetches handle & country from DMR ID via the Radioid API.

🎨

Ham Radio Navy Theme

Deep navy + teal accent matching the 9M2PJU logo. Card-based layout with visual grouping.

💬

SMS & DTMF

M17 SMS messaging and IAX DTMF tone sending built in.

Screenshots

Main — Connection & PTT

Settings

Debug Log

Hosts Editor

About — 9M2PJU

💕 Support the Project

DroidStar 9M2PJU is free and open source. If you find it useful, consider buying us a coffee. Every contribution helps keep the builds coming.

Buy Me a Coffee PayPal Donation

How to Install

Download the APK file using the button above.
On your Android phone, open Settings → Apps → Special access → Install unknown apps (or "Install unknown apps" for your browser/file manager) and allow it.
Tap the downloaded .apk file in your Files app or notification.
Follow the prompts to Install. The app is release-signed, so Android will warn it's from an unknown source — this is expected.
Open DroidStar 9M2PJU and configure your callsign, DMR ID, and host. Vocoders are built in — no extra downloads needed.

Updating? Just download the new APK and install it over the old one. All builds use the same release key, so your settings are preserved — no need to uninstall first.