AdminConsole
Tutorials/Intermediate
Intermediate45 minFlutter

Build a Flutter map and place picker

Configure native keys, render the map, and return a validated place to your form.

By the endA reusable cross-platform location field.
Real-world scenario

Build against an explicit contract

A Flutter form needs a reusable place picker whose Dart state and native map lifecycle remain synchronized.

A Mappls developer projectA restricted Flutter applicationFixture data with no production credentialsA request, aggregate, or correlation ID strategy
Step 1

Define the user and system contract

A Flutter form needs a reusable place picker whose Dart state and native map lifecycle remain synchronized. Record the region, data freshness, latency budget, privacy purpose, credential owner, and fallback before choosing an SDK or endpoint.

Step 2

Configure platform runners

Apply the documented Android and iOS requirements, restrict each platform key, and pin compatible plugin/native versions.

Maps · SDK or product slice
<!doctype html>
<html>
  <head>
    <script src="https://sdk.mappls.com/map/sdk/web?v=3.0&access_token=YOUR_STATIC_KEY"></script>
    <style>html, body, #map { height: 100%; margin: 0; }</style>
  </head>
  <body>
    <div id="map"></div>
    <script>
      const map = new mappls.Map("map", {
        center: { lat: 28.612964, lng: 77.229463 },
        zoom: 12
      });
    </script>
  </body>
</html>
Step 3

Make selection explicit

Keep query text, suggestion list, map camera, candidate marker, accepted Mappls Pin, and form value as separate states.

Step 4

Dispose and restore correctly

Cancel searches, dispose controllers/subscriptions, restore the accepted place after recreation, and avoid treating a camera center as user consent.

Step 5

Prove the production behavior

Automate the happy path and every named failure. The release is ready only when the form submits only an accepted place; back navigation releases native resources; platform permission denial still permits manual search. Capture provider request identity without logging credentials or unnecessary precise location.

Recovery design

Failure modes you must exercise

plugin/native SDK mismatch

Fail fast with a typed, user-safe outcome and preserve the original request identity.

late suggestion after widget disposal

Keep the last verified state, mark freshness honestly, and retry only within the documented idempotency boundary.

camera moved after a prior selection

Reconcile durable local and provider evidence before declaring success or issuing a compensating command.

Never turn uncertainty into success

Timeout after a stateful command is an unknown outcome. Query by provider/idempotency identity or wait for authoritative events; do not blindly retry a new command.

Acceptance criteria

Definition of done

the form submits only an accepted placeback navigation releases native resourcesplatform permission denial still permits manual search

Flutter production checks

Android and iOS configuration is version-controlledControllers are used only after readinessStreams and platform views are disposedRelease builds are tested on physical devices
Grounded implementation

Continue from source, contracts, and a full app

These links resolve to repository-derived evidence; unsupported package names and endpoints are not filled in from guesswork.

Study the complete Consented address verification state machine
Tutorial complete

Run it, break it, then observe it

Start with fixture credentials, execute the failure plan, and use request logs, usage, webhook evidence, and operational metrics before promoting traffic.