WEBVTT

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Welcome back.

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Let's continue with add marker function.

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Start with try and catch val data equals to hash map of.

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Set the lat to marker dot latitude longitude to marker longitude.

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Here you should pay attention to this important uh note can't access Google dot protobuf and the lat

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long.

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This is not the correct thing we imported, so we need to remove this import alt plus enter to import

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the class and don't import comment google.com type we.

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We need to import Google Android maps module okay, so remove the previous one and add this.

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Because this is a very important thing.

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We imported wrong class Firebase dot collection and set the markers.

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Don't worry I will lecture everything.

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Just follow me now.

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Document name dot Set data dot await.

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Let's start from above.

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Override.

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You are overriding the function declared in marker repository interface, and suspend means that this

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function suspends and is suspending function.

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It can be called inside coroutines without blocking the main thread.

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The parameters are markers and name marker of type Latlong and the name is of type string.

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Try block.

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You wrap the function in try catch so you can catch any errors like network errors.

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Rethrow them as your own marker exception.

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Um handling.

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So here you can handle the errors and val data equals to HashMap.

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You create a HashMap to represent what you want to store.

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In Firestore.

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The Firebase Firestore collection markers get.

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The markers collection will be created if it is uh not exist.

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Document document name creates or overwrite that document with ID equals to name.

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So the ID of the collection with would be, uh, the ID of the collection would be markers, the ID

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of the document would be the name, and the fields would be the data.

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So here I'm using the set.

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Set the content of the document to your map latitude and longitude.

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If the document exists it overrides it.

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So again guys Firebase dot collection gets the markers collection and will be created.

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If it doesn't exist.

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Document name create or overwrite the document with ID equals to name.

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This is important if you pass uh home as name and document ID will be home.

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Set data.

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Set the content of the document to your map latitude plus longitude.

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If your document exists, it overrides it and await.

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Since Firestore is asynchronous, you await the result.

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This is a suspend function.

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This suspends the coroutine until the operation completes.

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If this succeeds, the function And normally.

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Otherwise we need to throw exceptions using the catch block.

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So if anything goes wrong like no internet Firestore permission error, bad arguments, you catch the

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exception and throw your own custom exception with the message.

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For example let's start with exception.

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And here for example print stack trace.

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Okay.

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This is our function.

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Alt plus enter to implement the members add markers.

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We need to to check this error because the lat long is of type uh it's missing type of.

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And uh we imported it wrong in interface.

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Okay.

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So you notice that Google type.lat long.

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We need to copy this and replace it in the Firebase or the marker repository interface.

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And this will solve the error.

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Okay.

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The problem was importing the wrong class of lat long.