How to invite facebook friends to install aperticular application

There are two functions given that will help to implement app invitation functionality.

 CallbackManager callbackManager;
      ShareDialog shareDialog;

First Function:-

 
 private void initializationToAppInvite()
    { 
      FacebookSdk.sdkInitialize(this);
       callbackManager = CallbackManager.Factory.create();
       shareDialog = new ShareDialog(this);
       Uri targetUrl =AppLinks.getTargetUrlFromInboundIntent(this, getIntent());
         if (targetUrl != null) 
            {
               System.out.println("URL: " + targetUrl.toString());
            } 
          else 
              {
                AppLinkData.fetchDeferredAppLinkData(MenuView.this, new AppLinkData.CompletionHandler()
                   {
                    @Override
                    public void onDeferredAppLinkDataFetched(AppLinkData appLinkData) 
                           {
                              if (appLinkData!=null)
                                 {
                                    System.out.println("Applink data" + appLinkData.toString());
                                  }
                                else
                                    {
                                      System.out.println("appLinkData is null");
                                     }
                               }
                        });
                     }
                }

Second Function:-

 /*********************************************** method to invite friends **********************************************/
           private void inviteFriends()
            {
            String appLinkUrl, previewImageUrl;
            appLinkUrl = "https:...."; // this applink url you will get from facebook developer when you register your application there
            previewImageUrl = "https:....abc.jpeg";  // this is the image link which you needed to post on app invite 
            if (AppInviteDialog.canShow()) 
                     {
                AppInviteContent content = new AppInviteContent.Builder()
                .setApplinkUrl(appLinkUrl)
                .setPreviewImageUrl(previewImageUrl)
                .build();
                AppInviteDialog.show(this, content);
            }
            else
            {
              Toast.makeText(MenuView.this.getApplicationContext(),"Native facebook app is missing", Toast.LENGTH_SHORT).show();
            }
             }

/***********************************************************************************************************/