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I'm using Firebase Android SDK and became interested in sending synchronous request instead of asynchronous. According to the documentation, in any request callbacks are presented. But what about the synchronicity?
Thanks!
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Since when reading data from firestore, it happens asynchronously.
Most of Firebase's APIs are asynchronous. This might be confusing at first: you're making a call, for example to fetch some data from Firestore, but you don't get a result back.
A promise represents an operation and the future value it may return. It also lets you propagate errors similar to try/catch in synchronous code. You can read about promises in the Firebase SDK on The Firebase Blog, and promises in general on MDN.
There is no way to synchronously load data from the Firebase Database.
While it is common for developers new to Firebase to wish for a synchronous method, it simply doesn't fit with Firebase's data synchronization model. Also see my answer here: Setting Singleton property value in Firebase Listener
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