Create Facebook App

1. Open https://developers.facebook.com/

2. Register as developer

3. Add new app

4. Open Dashboard, where you can find App ID

5. Add App ID in your AndroidManifest.xml

   <application>
   
           <meta-data
               android:name="com.facebook.sdk.ApplicationId"
               android:value="**App ID**"
           />
   
   </application>

6. Open Settings and Add your email

7. Add platform + Add Platform and choose Android

8. Add your package name from your AndroidManifest.xml

9. For hash key use 'keytool':

   keytool -exportcert -alias <RELEASE_KEY_ALIAS> -keystore <RELEASE_KEY_PATH> | openssl sha1 -binary | openssl base64
   

   Or programmatically:

   public void printHashKey() {
      try {
         PackageInfo info = getActivity().getPackageManager().getPackageInfo("com.gorbin.androidsocialnetworksextended.asne",
         PackageManager.GET_SIGNATURES);
         for (Signature signature : info.signatures) {
            MessageDigest md = MessageDigest.getInstance("SHA");
            md.update(signature.toByteArray());
            Log.d("HASH KEY:", Base64.encodeToString(md.digest(), Base64.DEFAULT));
         }
      } catch (PackageManager.NameNotFoundException e) {
      } catch (NoSuchAlgorithmException e) {
      }
      }

11. Open Status & Review and start app More detailed: https://developers.facebook.com/docs/android/getting-started/