Facebook error : allow key: configure your app key hashes at dev.facebook android. Solved!

Facebook error with key hashes

Goto: https://developers.facebook.com/apps, Settings, Add platform "Android", input Key Hashes of your app.

public static String printKeyHash(Activity context) {
       PackageInfo packageInfo;
       String key = null;
       try {

           //getting application package name, as defined in manifest
           String packageName = context.getApplicationContext().getPackageName();

           //Retriving package info
           packageInfo = context.getPackageManager().getPackageInfo(packageName,
                   PackageManager.GET_SIGNATURES);

           Log.d("Package Name=", context.getApplicationContext().getPackageName());

           for (Signature signature : packageInfo.signatures) {
               MessageDigest md = MessageDigest.getInstance("SHA");
               md.update(signature.toByteArray());
               key = new String(Base64.encode(md.digest(), 0));

               // String key = new String(Base64.encodeBytes(md.digest()));
               Log.d("Key Hash=", key);

           }
       } catch (PackageManager.NameNotFoundException e1) {
           Log.d("Name not found", e1.toString());
       }

       catch (NoSuchAlgorithmException e) {
           Log.d("No such an algorithm", e.toString());
       } catch (Exception e) {
           Log.d("Exception", e.toString());
       }

       return key;
   }