Question 420285 in Flutter Question posted in
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Issues in flutter carplay

I am using Flutter CarPlay and experiencing the following issues:

When opening CarPlay without first opening the app on mobile, a blank screen appears.
After killing the app on mobile, CarPlay shows a blank screen, which is only resolved by reconnecting to CarPlay.
When the device is locked, I am unable to call APIs from the mobile app.
Is there a way to fix these issues? If not, could you provide any alternatives or resources on how to address them?

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2

Answers


  1. 0

    1. Blank Screen on CarPlay When App Is Not Opened on Mobile
    Cause: CarPlay might require the app to initialize fully on the mobile device before it can display content on CarPlay.

    Fix:

    Ensure that your app's CarPlay extension properly initializes and handles the required setup when launched independently of the main app.
Implement a didFinishLaunchingWithOptions handler in your iOS App Delegate to ensure CarPlay sessions initialize correctly.
Test your app using the latest version of the Flutter CarPlay plugin or alternative libraries, ensuring compatibility with the latest iOS version.

    2. Blank Screen After Killing the Mobile App
    Cause: Killing the app might terminate essential background processes required for CarPlay functionality.

    Fix:

    Implement a mechanism to restart the CarPlay session automatically. This might involve using UIApplicationDelegate methods to detect when the app is terminated and relaunch the CarPlay service. Enable background modes for "Audio, AirPlay, and Picture in Picture" and "Background fetch" in your app's capabilities to ensure the app remains responsive to CarPlay even after being killed. Ensure the app adheres to CarPlay's lifecycle requirements by checking the CarPlay interface's connection status and reinitializing if needed.
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  2. 0

    Answer: These are common challenges with Flutter CarPlay related to app lifecycle and background execution. Here are steps to resolve or mitigate these issues:

    1. Blank Screen When Opening CarPlay Without the App Open
      Ensure proper initialization in your app’s didFinishLaunchingWithOptions (iOS entry point).
      Confirm that all required plugins for CarPlay and UI rendering are initialized.

    2. Blank Screen After Killing the App
      Handle app lifecycle transitions using WidgetsBindingObserver to detect and reinitialize CarPlay components when the app is reopened.
      Add logic to restore CarPlay sessions when the app is relaunched.

    3. Unable to Call APIs When the Device Is Locked
      Add the following to your Info.plist for background execution:

      UIBackgroundModesfetchprocessing

    Use secure storage like Keychain for tokens, which remain accessible when the device is locked.
    Implement background fetch or retry logic for API calls.

    Alternatives
    Check for updates or known issues in the Flutter CarPlay plugin repository.
    Consider implementing critical CarPlay features in native Swift/Objective-C code and exposing them to Flutter via platform channels.

    Resources
    Apple’s CarPlay Documentation
    Apple’s Background Tasks Guide

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