Programming Tutorials

  Implementing protected routes in Flutter should be straightforward, yet it remains one of the most common sources of frustration when adopting   go_router . You define a redirect guard, wire it up to your authentication state, run the app, and immediately hit a wall: the console explodes with a "Stack Overflow" error, or the UI stutters as the router bounces endlessly between   /   and   /login . This isn't a bug in GoRouter. It is a logical recursion error in how the redirection state is handled. The Root Cause: Recursive Redirection To fix the loop, you must understand the mechanics of the  redirect  callback. GoRouter's  redirect  function triggers on  every  navigation event. This includes the navigation events initiated by the  redirect  function itself. Here is the anatomy of an infinite loop: User starts app (unauthenticated). Router attempts to load  /  (Home). Guard checks:  isLoggedIn  is fa...

  Few things destroy the "native feel" of a Flutter app on Android faster than a broken hardware back button. With the migration to Android 14’s Predictive Back gesture and the deprecation of   WillPopScope , many developers implementing GoRouter find themselves in a bind: either the back button does nothing, it closes the entire app instead of the route, or it ignores interception logic (like "Save changes?" dialogs). The issue lies in the friction between GoRouter’s declarative routing API and Flutter’s Imperative Navigator 2.0 implementation of the new  PopScope  widget. The Root Cause: Predictive Back & The PopScope Shift Historically,  WillPopScope  allowed you to veto a pop action asynchronously. This is incompatible with Android 14's Predictive Back, which requires the OS to know  in advance  if a back gesture will be accepted or rejected to render the animation. Flutter replaced this with  PopScope . Unlike its predecessor,  ...