// in minifest file
 <!-- facebook  starts-->
        <meta-data
            android:name="com.facebook.sdk.ApplicationId"
            android:value="@string/facebook_app_id" />
        <provider
            android:name="com.facebook.FacebookContentProvider"
            android:authorities="com.facebook.app.FacebookContentProvider@string/facebook_app_id"
            android:exported="true" />

//in Fragment class
 // Global variables
 ShareDialog shareDialog;
 CallbackManager callbackManager = CallbackManager.Factory.create();

// image on click
  shareDialog = new ShareDialog(getActivity());
                // this part is optional

                shareDialog.registerCallback(callbackManager, new FacebookCallback<Sharer.Result>() {
                    @Override
                    public void onSuccess(Sharer.Result result) {
                        Log.d("FACEBOOK onSuccess", "" + result);
                    }

                    @Override
                    public void onCancel() {
                        Log.d("FACEBOOK onCancel", "onCancel");
                    }

                    @Override
                    public void onError(FacebookException error) {
                        Log.d("FACEBOOK error", "" + error.getMessage());
                    }
                });

                if (ShareDialog.canShow(ShareLinkContent.class)) {
                    Uri path = Uri.parse("android.resource://com.app/" + R.drawable.logo);
                    ShareLinkContent linkContent = new ShareLinkContent.Builder()
                            .setContentTitle("title")
                            .setContentDescription(
                                   "product_dec")
                            .build();
                    shareDialog.show(linkContent);
                }