Get hash key for app on facebook developers page

GetHashKeyForFacebookApp.java

private void getHashKey() {
        try {
            PackageInfo info = getPackageManager().getPackageInfo("your.package", PackageManager.GET_SIGNATURES);
            for (Signature signature : info.signatures) {
                MessageDigest md = MessageDigest.getInstance("SHA");
                md.update(signature.toByteArray());
                Log.d("Facebook Hash key: ", Base64.encodeToString(md.digest(), Base64.DEFAULT));
            }
        } catch (PackageManager.NameNotFoundException e) {

        } catch (NoSuchAlgorithmException e) {

        }
}