After calling dispose() any related HERE SDK feature should no longer be used. Calling dispose() will stop pending requests and close open files and databases that are still running on the main thread. Dispose ObjectsĪll HERE SDK classes will be garbage collected by Flutter if the instance is no longer referenced or set to null.įor the SDKNativeEngine, which can be initialized automatically or programmatically, you can free resources by calling SDKNativeEngine.sharedInstance?.dispose(), for example, when the hosting widget's lifetime has ended. Most often this class gets a reference to a MapView to start its work.ĭespite the popular phrase that "everything is a widget", the example code is kept free of most Flutter dependencies - instead it's mostly pure Dart code that shows how the HERE SDK can be used. Since each app is focusing on a different aspect of the HERE SDK, that code can be found in a single class postfixed with ".Example.dart" in its class name. Each example app follows the same entry point from which the HERE SDK is initialized. We hope this makes it easier to see the relevant parts of the shown APIs. As much as possible the HERE SDK example code is decoupled from the surrounding platform code. The accompanying example apps follow the same structure. In some cases, the obvious code is left out, but it can be found in the accompanying example apps that can be built and deployed instantly on any supported device with a set of valid HERE credentials. However, for the sake of simplicity and to not shadow the educational approach of this guide, not all edge scenarios may be handled, especially when it comes to error handling or robust threading. The shown code snippets cover best practice example code ready to be used for your own applications. ![]() See an overview of the available use cases covered in this Developer's Guide.If you are interested in building your first app showing a HERE map, take a look at the Get Started section to guide you through the first simple steps.In the example section, you can find the example apps accompanying this user guide.All sections are independent from each other, making it easy to skip any section and to dive straight into the topics which you are most interested in. To avoid memory leaks, consider breaking the reference to this object during dispose of ().In the following use case sections, we will guide you through the most common usage scenarios and reveal tips and easy-to-understand guidelines to help you get the most out of the HERE SDK for Flutter. Another solution is to check the "mounted" property of this object before calling setState() to ensure the object is still in the tree.Į/flutter (22681): This error might indicate a memory leak if setState() is being called because another object is retaining a reference to this State object after it has been removed from the tree. The preferred solution is to cancel the timer or stop listening to the animation in the dispose of the () callback. This error can occur when code calls setState() from a timer or an animation callback. If I keep repeat back and forth very fast I get an error on console message in my IntelliJ IDE as E/flutter (22681): Dart Error: Unhandled exception:Į/flutter (22681): setState() called after dispose(): _BillsPayWaterState#66be5(lifecycle state: defunct, not mounted)Į/flutter (22681): This error happens if you call setState() on a State object for a widget that no longer appears in the widget tree (e.g., whose parent widget no longer includes the widget in its build). If no info found it warns the user that there isn't any info.įrom the drawer back button, I go back to the previous page. ![]() I call my stateful widget page and get some info from the server.
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