Flutter Sensors

A small Flutter demo that shows various device sensors (accelerometer, gyroscope, magnetometer/compass, GPS/location). NFC support was intentionally removed from this repository; notes and instructions are included below.

Quick summary:

• Platform: Android & iOS
• Main sensors shown: accelerometer, gyroscope, magnetometer (compass), GPS/location
• Removed: NFC support (nfc_manager), NFC manifest entries and res/xml/nfc_tech_filter.xml

Getting Started

• Prerequisites:

  • Flutter SDK (stable channel) installed and on your PATH
  • Android SDK (for Android builds) and Xcode (for iOS builds on macOS)
  • A physical device is recommended for sensor tests (emulators may not expose all sensors)

• Install dependencies:

cd "$(pwd)"
flutter pub get

• Run on device (debug):

flutter run

• Build release APK:

flutter build apk

• Build iOS (macOS):

flutter build ios --no-codesign

Files of interest

• lib/sensors_page.dart: main UI and sensor subscriptions.
• android/app/src/main/AndroidManifest.xml: Android manifest (NFC entries removed).
• ios/Runner/Info.plist: iOS permission strings (location keys added).
• pubspec.yaml: project dependencies.

Dependencies

• This project uses (current): sensors_plus, geolocator, flutter_compass.
• NFC dependency nfc_manager was removed intentionally. If you need NFC, re-add it to pubspec.yaml and follow package instructions.

Notes about NFC removal

• The manifest previously referenced @xml/nfc_tech_filter, which caused a resource linking failure during build when that resource was missing. To avoid that class of problems the NFC entries and helper XML were removed.
• If you later reintroduce NFC support, make sure to:
  • Add nfc_manager (or equivalent) to pubspec.yaml.
  • Add the res/xml/nfc_tech_filter.xml resource and correct <meta-data> entry in AndroidManifest.xml.
  • Add any needed iOS Info.plist keys if the package requires them.

iOS permissions

• This app uses geolocator for GPS. The following keys were added to ios/Runner/Info.plist:
  • NSLocationWhenInUseUsageDescription — description shown when requesting location while app is in use.
  • NSLocationAlwaysAndWhenInUseUsageDescription — description shown if you request background/always access.

Make sure the descriptions explain why you need the permissions to avoid rejection during App Store review.

Temperature sensor (removed)

• Many phones do not expose an ambient temperature sensor. Originally a Thermometer card was present in the UI as an informational placeholder.
• Options if you want temperature data:
  • Use a weather API (e.g., OpenWeatherMap) to get ambient temperature by coordinates. This is the most portable solution.
  • Integrate a hardware-specific plugin or platform channel if you have a device with an actual ambient sensor.

Example: fetch temperature from OpenWeatherMap (conceptual):

final url = 'https://api.openweathermap.org/data/2.5/weather?lat=$lat&lon=$lon&units=metric&appid=YOUR_KEY';
// Use http package to GET and parse JSON -> main.temp

Troubleshooting

• Android resource linking error referencing @xml/nfc_tech_filter: remove NFC manifest entries or add the missing file (android/app/src/main/res/xml/nfc_tech_filter.xml).
• If you see permission or runtime failures on location: ensure location services are enabled on the device and that you granted the requested permission.
• If flutter pub get shows incompatible versions, run flutter pub outdated then update versions as appropriate.

Contributing

• Feel free to open issues or PRs. Suggested small tasks:
  • Add a real temperature data source (weather API integration).
  • Improve permission handling UX and explanatory dialogs.

License

• This repository includes example/demo code — pick an appropriate license for your project or ask and I can add one.

If you want, I can:

• Add an example OpenWeatherMap integration and UI to replace the removed thermometer.
• Reintroduce NFC properly (add resource and dependency) instead of removing it.

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Last updated: November 26, 2025

flutter_sensors

A new Flutter project.

Getting Started

This project is a starting point for a Flutter application.

A few resources to get you started if this is your first Flutter project:

• Lab: Write your first Flutter app
• Cookbook: Useful Flutter samples

For help getting started with Flutter development, view the online documentation, which offers tutorials, samples, guidance on mobile development, and a full API reference.