Great question—let's tackle this step by step, since this is a common use case for Google Maps APIs:

Absolutely! This is exactly what these tools are designed for. Here's how to implement each core feature:

• Location Markers: Use the Marker component from the Google Maps SDK for iOS/Android to place custom pins at your desired locations. You can tweak icons, colors, and tap actions to fit your app's flow.
• Route Display: Call the https://maps.googleapis.com/maps/api/directions/ endpoint with your origin, destination, and any waypoints. Parse the response to extract the route's polyline coordinates (from overview_polyline or individual steps), then use the SDK's Polyline class to draw the path directly on the Google Map.
• Turn-by-Turn Navigation Steps: The Directions API returns detailed steps for every segment of the route—including maneuver instructions, distance, and duration. You can display these steps in your app's UI, or leverage the Google Maps Navigation SDK (a dedicated component) to handle full turn-by-turn guidance with voice prompts, which saves you from building the navigation interface from scratch.

Google doesn't reject apps for using their Maps APIs as long as you adhere to their Terms of Service (ToS). Here are the critical rules to follow:

• You must use the official Google Maps SDK to display all map content—you can't route Directions API data through a third-party map provider.
• Keep Google's copyright attribution visible on the map at all times (the SDK typically handles this automatically, but don't hide or modify it).
• Don't alter or misrepresent the navigation instructions returned by the API—you can format the text for your UI, but the core guidance must stay accurate.
• Ensure you have a valid billing setup in Google Cloud (even if you're under the free quota) to prevent service outages, especially if your app is commercial.

As long as you're building a standard mapping/navigation app with these features, you won't face rejection.

• The 2500 free daily requests are for standard Directions API calls. Once you exceed this, you'll be charged per request at the current rate listed in Google Cloud's pricing details.
• To manage costs effectively:
  • Set up budget alerts in the Google Cloud Console to get notified when you're approaching your quota or spending limit.
  • Cache frequently used routes (e.g., popular origin-destination pairs) to avoid redundant API calls.
  • Use optional API parameters (like mode to specify driving/walking/biking) to fetch only the data you need, keeping your app efficient.

内容的提问来源于stack exchange，提问作者cjd