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There are two methods of getting SHA-1 key, but First one is not working for Windows user. So, if you are a Windows user then go for 2nd Method.
Update:- On Android Studio Latest version(on 24 Sept 2021) 2020.3.1 for Windows 64-bit (912 MiB), Step 2 will not Work. So, go for Step 3.
1. Using Keytool
Open a terminal and run the keytool the utility provided with Java to get the SHA-1 fingerprint of the certificate. You should get both the release and debug certificate fingerprints.
Note:- If you are not able to get your SHA-1 key using Keytool then Follow the below Method, in this method you will definitely get your SHA-1 key.
2. Using Gradle’s Signing Report
You can also get the SHA-1 of your signing certificate by Gradle signingReport. But for that, you have to follow some steps.
Step 1: – First of all => open your project in Android Studio and open the project. =>In the project, go to the android/app directory where you find build.gradle file. => Open it. => After opening, you’ll find an Open for Editing in Android Studio option, Click on it and open it in a new Tab. See the Below Image.
Step 2 :- After opening the file in the new tab, Wait for some time until Gradle Build Model Process Completes.
=> After Build Successful, go to the upper-right section where you find the Gradle option. Click On it. => After that Open Android->Tasks->android and Double click on signingReport. See the Below Image For Help.
Step 3:- After Clicking on it, you’ll get a List of SHA-1 Keys but you have to choose Debug-Debug SHA-1 Key and copy and paste it on your Firebase. See the Below Image:-