Generate Facebook Android SDK keyhash using java code

Trouble generating keyhash for Facebook SDK integration with your application, here is the java code to generate keyhash.

Add the following code inside onCreate()

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());
            System.out.println("KeyHash : "+ Base64.encodeToString(md.digest(), Base64.DEFAULT));
            }
     } catch (NameNotFoundException e) {
   } catch (NoSuchAlgorithmException e) {
 }

NOTE: Do not forget to replace YOUR_PACKAGE_NAME with your Main activity package name. After running the application you will find the key hash in LogCat.