Facebook login in my android app is working fine in release apk, but not working properly after publishing the same apk on play store

I improved @vChamps answer a bit. just pass the SHA1 string to below function

public void hashFromSHA1(String sha1) {
    String[] arr = sha1.split(":");
    byte[] byteArr = new  byte[arr.length];

    for (int i = 0; i< arr.length; i++) {
        byteArr[i] = Integer.decode("0x" + arr[i]).byteValue();
    }

    Log.e("hash : ", Base64.encodeToString(byteArr, Base64.NO_WRAP));
}

echo SHA1_here | xxd -r -p | openssl base64

Does the same work as the above code.

Copy Paste the SHA1 key here to Reduce all the Headache.Link Internallly its converting Hex to Base 64.

Kotlin code:

        import android.util.Base64
        import android.util.Log

        fun hashFromSHA1(sha1: String) {
            val arr = sha1.split(":".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray()
            val byteArr = ByteArray(arr.size)

            for (i in arr.indices) {
                byteArr[i] = Integer.decode("0x" + arr[i])!!.toByte()
            }

            Log.e("hash : ", Base64.encodeToString(byteArr, Base64.NO_WRAP))
        }

To get the hash based on the Google Play signIn, just convert the SHA-1 key from Play Console to base64 and them paste into Developer Facebook android config. You can use this online converter: http://tomeko.net/online_tools/hex_to_base64.php?lang=en

If you already have your SHA1 key you can use the online converter tool - to generate your hash code here