I have problem about login with facebook acount in my application. I read to Facebook Doc. And I did  all step as Facebook Doc. 

First in login with facebook acount in app - **SUCCESSFUL** ! and than logout in application. I want to login **again** with my facebook acount. **But not working** !! And I took this Excepiton ! Please help me !


**Exception : This app has no Android Key hashes configured.Configure your app key hashes at http:developers.facebook.com/apps/&quot;APP ID&quot;**

Finaly; I used to part of code for HashKey Genarate 

     try {
            PackageInfo info =     getPackageManager().getPackageInfo(&quot;MY PACKAGE NAME&quot;,     PackageManager.GET_SIGNATURES);
            for (android.content.pm.Signature signature : info.signatures) {
                MessageDigest md = MessageDigest.getInstance(&quot;SHA&quot;);
                md.update(signature.toByteArray());
                String sign=Base64.encodeToString(md.digest(), Base64.DEFAULT);
                Log.e(&quot;MY KEY HASH:&quot;, sign);
              //  Toast.makeText(getApplicationContext(),sign,     Toast.LENGTH_LONG).show();
            }
    } catch (NameNotFoundException e) {
    } catch (NoSuchAlgorithmException e) {
    }



**I resolved my issue.** I should have done setting on Facebook. 
Steps :

 1. Go to facebook developer&#39;s page :
    [https://developers.facebook.com/][1]  
 2. Open the App tabs and than
    click the Setting
 
 3. Paste the generate hashkey on HashKey&#39;s field =  If you don&#39;t have it yet, get your key hash part of code 
 4. And than **Single Sign On will be &quot;Yes&quot; : Single Sign On: Enable this setting.**

I wanted to share my resolve. Maybe someone need this solution. Good Luck !


  [1]: https://developers.facebook.com/

All Facebook Graph-Api-v2.2 Solutions on Gang of Coders

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This app has no Android Key hashes configured. - Login with Facebook SDK