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Native",[127,145,158,171,185,198],{"id":128,"topic":9,"difficulty":129,"body":130,"options":131,"correct_key":133,"explanation":144},"019fa93e-4e51-7302-86cc-18d2f50488e0",1,"In Flutter, what does the `AppLifecycleState.resumed` value mean?",[132,135,138,141],{"key":133,"text":134},"a","The app is visible and responding to user input.",{"key":136,"text":137},"b","The app's process has been fully terminated by the OS.",{"key":139,"text":140},"c","The app is waiting for a network connection.",{"key":142,"text":143},"d","The app is compiling in the background.","`resumed` means the application is visible and responding to user input; it is the normal foreground-and-interactive state.",{"id":146,"topic":9,"difficulty":129,"body":147,"options":148,"correct_key":139,"explanation":157},"019fa93e-4e52-7861-b7c3-81162c3421bf","What is the primary purpose of mixing `WidgetsBindingObserver` into a `State` class?",[149,151,153,155],{"key":133,"text":150},"To register the widget as a platform channel handler.",{"key":136,"text":152},"To automatically generate a widget's layout constraints.",{"key":139,"text":154},"To let that state object observe app-wide lifecycle events.",{"key":142,"text":156},"To make the widget's build method run on a background isolate.","`WidgetsBindingObserver` is a mixin that lets a `State` object receive callbacks for app-wide events, including lifecycle state changes, by overriding methods like `didChangeAppLifecycleState`.",{"id":159,"topic":9,"difficulty":129,"body":160,"options":161,"correct_key":136,"explanation":170},"019fa93e-4e53-70d1-9c0c-cfff7d01b9be","What is a `MethodChannel` used for in Flutter?",[162,164,166,168],{"key":133,"text":163},"Storing key-value preferences persistently on disk.",{"key":136,"text":165},"Invoking native code and receiving a result.",{"key":139,"text":167},"Rendering widgets directly to the native view hierarchy.",{"key":142,"text":169},"Compiling Dart code into native machine code at runtime.","A `MethodChannel` lets Dart code invoke a named method on the native (iOS\u002FAndroid) side and asynchronously receive a single result, forming the basic Dart-to-native RPC mechanism.",{"id":172,"topic":9,"difficulty":173,"body":174,"options":175,"correct_key":142,"explanation":184},"019fa93e-4e53-7796-be3f-7df33f57af9b",2,"Why does a `MethodChannel` typically use a namespaced string like `\"com.example.app\u002Fbattery\"` as its channel name?",[176,178,180,182],{"key":133,"text":177},"Because it doubles as the app's bundle identifier.",{"key":136,"text":179},"To specify the exact native thread the channel runs on.",{"key":139,"text":181},"Because Dart requires all identifiers to contain a forward slash.",{"key":142,"text":183},"To avoid collisions with names used by other plugins.","The channel name is just a string key both sides must agree on; namespacing it (like a package-style prefix) avoids accidental collisions with other plugins that might register a channel with a common 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synchronously.",{"id":199,"topic":9,"difficulty":173,"body":200,"options":201,"correct_key":136,"explanation":210},"019fa93e-4e55-712e-a459-762e11bd7e0b","How does an `EventChannel` differ from a `MethodChannel` in typical use?",[202,204,206,208],{"key":133,"text":203},"`EventChannel` is a synchronous alternative used only in debug builds.",{"key":136,"text":205},"`EventChannel` streams events from native to Dart over time.",{"key":139,"text":207},"`EventChannel` replaces `MethodChannel` entirely in modern Flutter.",{"key":142,"text":209},"`EventChannel` can only send data from Dart to native, never the reverse.","While `MethodChannel` models a single request producing a single response, `EventChannel` models a continuous stream: native code can push multiple events over time (e.g. sensor readings) to a Dart 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