Fix nfc

[Yugesh-Kumar-S]

Closes #7

Added a notification to turn on the NFC if disabled .

Summary by Sourcery

Improve NFC functionality by adding device and NFC availability checks, error handling, and user feedback

New Features:

• Add NFC availability and device support checks before initiating NFC transfer

Bug Fixes:

• Prevent NFC transfer attempts on unsupported or disabled devices

Enhancements:

• Implement error handling and user feedback mechanisms for NFC operations

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds NFC availability checks and notifications to the application. It ensures that the user is informed if NFC is not supported or disabled, and provides feedback on the transfer process. It also adds the fluttertoast and flutter_nfc_kit packages as dependencies.

Sequence diagram for NFC write operation

sequenceDiagram
    participant User
    participant MyHomePage
    participant FlutterNfcKit
    participant MagicEpd
    participant FlutterToast

    User->>MyHomePage: Presses 'Start transfer' button
    MyHomePage->>FlutterNfcKit: Check NFC availability
    alt NFC not supported
        FlutterNfcKit-->>MyHomePage: NFCAvailability.not_supported
        MyHomePage->>MyHomePage: _showDialog('NFC not supported')
        MyHomePage->>User: Show dialog
    else NFC disabled
        FlutterNfcKit-->>MyHomePage: NFCAvailability.disabled
        MyHomePage->>MyHomePage: _showDialog('NFC is turned off')
        MyHomePage->>User: Show dialog
    else NFC available
        FlutterNfcKit-->>MyHomePage: NFCAvailability.available
        MyHomePage->>ImageHandler: Load image
        ImageHandler-->>MyHomePage: (red, black) image data
        MyHomePage->>MagicEpd: writeChunk(blackChunks, redChunks)
        MagicEpd-->>MyHomePage:  
        MyHomePage->>FlutterToast: _showToast('Transfer started successfully!')
        FlutterToast->>User: Show toast
    end

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File-Level Changes

Change	Details	Files
Added NFC availability checks and notifications.	Implemented checks for NFC support and enabled status. Displayed a dialog if NFC is not supported. Displayed a dialog if NFC is disabled, prompting the user to enable it. Added a toast notification to indicate the transfer started successfully. Wrapped the NFC writing process in a try-catch block to handle potential errors and display an error dialog.	lib/main.dart
Added the fluttertoast and flutter_nfc_kit packages.	Added fluttertoast as a dependency. Added flutter_nfc_kit as a dependency.	pubspec.yaml
Modified the nfc_write function to accept BuildContext.	The nfc_write function now requires a BuildContext parameter. The nfc_write function now uses the BuildContext to display dialogs.	lib/main.dart
Added helper functions to display dialogs and toasts.	Added a _showDialog function to display AlertDialogs. Added a _showToast function to display toast notifications.	lib/main.dart

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#7	The nfc_write() function should correctly execute the NFC write process and confirm the transfer.	✅
#7	Resolve the error: PlatformException(404, NFC not available, null, null).	✅
#7	The terminal should not log an array of [255, 255, 255, ...] instead of expected data.	✅

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[sourcery-ai]

Hey @Yugesh-Kumar-S - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider extracting the NFC functionality into a separate class or service to improve code organization and testability.
• The toast message should be more descriptive, such as 'Transfer started successfully, tap the NFC tag'.

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[sourcery-ai]

nitpick: Remove or replace the debug print statement.

Debug prints can clutter production logs. If logging is necessary, consider using a proper logging framework or conditionally compiling debug statements.

[kienvo]

This looks good but would be nicer if it had some way to navigate to the NFC setting so users won't have to go find the NFC setting on their phone.

[mariobehling]

Please resolve conflicts and add option into the settings.