Android Facebook SDK: Key hash does not match any stored key hashes when uploading google play

Question

My app uses facebook api for user login. On developing it works fine, but when I uploaded it to google play it stops working.

This is the error log:

Answer 1

This was giving the wrong key for me.

keytool -exportcert -alias  -keystore  | openssl sha1 -binary | openssl base64

A workaround that worked for me was: 1. Put this code in your launching activity

private void printKeyHash(){
    // Add code to print out the key hash
    try {
        PackageInfo info = getPackageManager().getPackageInfo(
                "YOUR_PACKAGE_NAME", 
                PackageManager.GET_SIGNATURES);
        for (Signature signature : info.signatures) {
            MessageDigest md = MessageDigest.getInstance("SHA");
            md.update(signature.toByteArray());
            Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));
            }
    } catch (NameNotFoundException e) {
        Log.d("KeyHash:", e.toString());
    } catch (NoSuchAlgorithmException e) {
        Log.d("KeyHash:", e.toString());
    }
}

1. Export the app for publishing on play store using the .keyStore
2. Install the app before uploading to play store and run it and note the keyHash printed.
3. Add the keyHash to the Facebook App.

Hope this helps someone.