Why is the Firebase emulator not being connected by the Android emulator?

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There could be several reasons why the Firebase emulator is not being connected by the Android emulator:

1. The Firebase emulator is not running : Ensure that you have started the Firebase emulator using the command firebase emulators:start in your terminal.

2. Incorrect hosts setting : Check if the Android emulator is pointing to the correct host. The default host for Firebase emulator is localhost:8080. You can check this by going to Settings > Proxy > Manual proxy settings and entering the Firebase emulator host and port.

3. Firebase dependencies are not up-to-date : Ensure that your app's Firebase dependencies are up-to-date. You can do this by checking your app's build.gradle file and confirming that the Firebase dependencies are the latest versions.

4. Network connection : Ensure that your Android emulator is connected to the same network as the Firebase emulator. You can check this by pinging the Firebase emulator from the Android emulator’s terminal.

5. Firewall blocking : Check if the firewall setting is blocking the connection between the Android emulator and the Firebase emulator. You can disable the firewall temporarily to verify this.