Facebook login showing error

Question

There is a facebook login button in my android app. I can login using that button. Button only one time I can login using facebook login button. I failed to login second time after succesfully logged out.This is the login response I got

Facebook ErrorInvalid key hash. The key hash HG2kYV1on+6yY1J7stl4KGrNsPA= does not match any stored key hashes. Configure your app key hashes at https://developers.facebook.com/apps/596405140754842/

But I logged in after copying that hash keys to stored keyhashes in my facebook devolopers page. When I install this app on another phone same problem occured.I solved it by copying that invalid hash key to stored hash keys in my facebook developers page. I also installed my app on phones without facebook application. In that case a new popup window comes asking email and facebook password. I can login and logout any number of times on those phones

But I need facebook login working on phones with facebook application without coping hash key for every phone

Possible duplicate of [Facebook android app error : Invalid key hash](http://stackoverflow.com/questions/30934225/facebook-android-app-error-invalid-key-hash) — Shrenik Shah, Mar 08 '17 at 07:23

score 1 · Accepted Answer · answered Mar 08 '17 at 07:30

Create two keyHashes

One using the command prompt:

$ keytool -exportcert -alias androiddebugkey -keystore "C:\Documents and Settings\Administrator.android\debug.keystore" | "C:\OpenSSL\bin\openssl" sha1 -binary |"C:\OpenSSL\bin\openssl" base64

using the code below:

private String getAppKeyHash() {
  try {
    PackageInfo info = getPackageManager().getPackageInfo(
            getPackageName(), PackageManager.GET_SIGNATURES);
    for (Signature signature : info.signatures) {
        MessageDigest md;

        md = MessageDigest.getInstance("SHA");
        md.update(signature.toByteArray());
        String something = new String(Base64.encode(md.digest(), 0));
        return something;

    }
} catch (Exception e) {
    Log.e("exception", e.toString());
}
return null;

}

add both the key Hases in Facebook developers application.

This will work.

Facebook login showing error

1 Answers1