how to use paging in new graph facebook v4 - facebook-android-sdk

Question

I have tried the code below but I am getting an error.How can I use paging in v4 facebook after/within login?
// Callback registration
loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
#Override
public void onSuccess(LoginResult loginResult) {
GraphRequest request2 = GraphRequest.newMeRequest(
loginResult.getAccessToken(),
new GraphRequest.GraphJSONObjectCallback() {
#Override
public void onCompleted(
JSONObject object,
GraphResponse response) {
JSONObject uu= response.getJSONObject();
if (uu!=null){
Log.w(TAG, "respomse: " + response.toString());
}
GraphRequest nextPageRequest = response.getRequestForPagedResults(GraphResponse.PagingDirection.NEXT);
if (nextPageRequest != null) {
nextPageRequest.setCallback(new GraphRequest.Callback() {
#Override
public void onCompleted(GraphResponse response) {
}
});

 
 
 nextPageRequest.executeBatchAsync(
}
}
});
Bundle parameters2 = new Bundle();
parameters2.putString("fields", "likes");
parameters2.putString("limit", "999");
request2.setParameters(parameters2);
request2.executeAsync();
});
}
}

Answer 1

I use this code within my User class. Every time a new user signs up using Facebook, this gets executed by calling get_user_data() within the User constructor.
For the below example to work for you too, you'll need an access token with the following permissions:
user_friends
email
Constants:
private ArrayList<HashMap> user_fb_friends;
private final String FIELDS = "id,first_name,last_name,name,gender,locale,timezone,updated_time,email,link,picture,friends{id,first_name,last_name,name,gender,updated_time,link,picture}";
private final String USER_FB_ID_TAG = "id";
private final String F_NAME_TAG = "first_name";
private final String L_NAME_TAG = "last_name";
private final String FULL_NAME_TAG = "name";
private final String GENDER_TAG = "gender";
private final String LOCALE_TAG = "locale";
private final String TIMEZONE_TAG = "timezone";
private final String UPDATED_TIME_TAG = "updated_time";
private final String EMAIL_TAG = "email";
private final String LINK_TAG = "link";
private final String PICTURE_TAG = "picture";
private final String DATA_TAG = "data";
private final String IS_SILHOUETTE_TAG = "is_silhouette";
private final String URL_TAG = "url";
private final String FRIENDS_TAG = "friends";
private final String PAGING_TAG = "paging";
private final String NEXT_TAG = "next";
private final String SUMMARY_TAG = "summary";
private final String TOTAL_COUNT_TAG = "total_count";
Actual code:
(the following code includes local setters)
private void get_user_data(){
GraphRequest request = GraphRequest.newMeRequest(
Signup_fragment.mAccessToken,
new GraphRequest.GraphJSONObjectCallback() {
#Override
public void onCompleted(JSONObject object, GraphResponse response) {
JSONObject json = response.getJSONObject();
if(json != null){
try {
user_fb_friends = new ArrayList<>();
/*
* Start parsing the JSON
* 1. Pars the user personal details and save them on new User class
*/
setUser_fb_id(json.getString(USER_FB_ID_TAG));
setF_name(json.getString(F_NAME_TAG));
setL_name(json.getString(L_NAME_TAG));
setFull_name(json.getString(FULL_NAME_TAG));
setGender(json.getString(GENDER_TAG));
setLocale(json.getString(LOCALE_TAG));
setTimezone(json.getInt(TIMEZONE_TAG));
setUpdated_time((Date) json.get(UPDATED_TIME_TAG));
setEmail(json.getString(EMAIL_TAG));
setFb_profile_link(json.getString(LINK_TAG));
Utils.log("User prsonal data was collected (" + getFull_name() + ")");
JSONObject pic_wrapper = json.getJSONObject(PICTURE_TAG);
JSONObject pic_data = pic_wrapper.getJSONObject(DATA_TAG);
if(!pic_data.getBoolean(IS_SILHOUETTE_TAG)){
setFb_profile_pic_link(pic_data.getString(URL_TAG));
}
/*
* 2. Go over the jsonArry of friends, pars and save each friend
* in a HashMap object and store it in user_fb_friends array
*/
JSONObject friends_wrapper = json.getJSONObject(FRIENDS_TAG);
JSONArray friends_json_array = friends_wrapper.getJSONArray(DATA_TAG);
if(friends_json_array.length() > 0){
for (int i = 0; i < friends_json_array.length(); i++) {
HashMap<String, String> friend_hashmap = new HashMap<String, String>();
JSONObject friend_json = friends_json_array.getJSONObject(i);
friend_hashmap.put(USER_FB_ID_TAG, friend_json.getString(USER_FB_ID_TAG));
friend_hashmap.put(F_NAME_TAG, friend_json.getString(F_NAME_TAG));
friend_hashmap.put(L_NAME_TAG, friend_json.getString(L_NAME_TAG));
friend_hashmap.put(FULL_NAME_TAG, friend_json.getString(FULL_NAME_TAG));
friend_hashmap.put(GENDER_TAG, friend_json.getString(GENDER_TAG));
friend_hashmap.put(UPDATED_TIME_TAG, friend_json.getString(UPDATED_TIME_TAG));
friend_hashmap.put(LINK_TAG, friend_json.getString(LINK_TAG));
JSONObject friend_pic_wrapper = json.getJSONObject(PICTURE_TAG);
JSONObject friend_pic_data = friend_pic_wrapper.getJSONObject(DATA_TAG);
if(!friend_pic_data.getBoolean(IS_SILHOUETTE_TAG)){
friend_hashmap.put(URL_TAG, friend_pic_data.getString(URL_TAG));
}
user_fb_friends.add(friend_hashmap);
Utils.log("A friend was added to user_fb_friends (" + i + ")");
}
/*
* 3. Get the URL for the next "friends" JSONObject and send
* a GET request
*/
JSONObject paging_wrapper = json.getJSONObject(PAGING_TAG);
String next_friends_json_url = null;
if(paging_wrapper.getString(NEXT_TAG) != null){
next_friends_json_url = paging_wrapper.getString(NEXT_TAG);
}
JSONObject summary_wrapper = json.getJSONObject(SUMMARY_TAG);
int total_friends_count = summary_wrapper.getInt(TOTAL_COUNT_TAG);
if(next_friends_json_url != null){
/*
* Send a GET request for the next JSONObject
*/
get_paging_data(response);
}
} else {
Utils.log("friends_json_array == null");
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
});
Bundle parameters = new Bundle();
parameters.putString("fields", FIELDS);
request.setParameters(parameters);
request.executeAsync();
}
private void get_paging_data(GraphResponse response){
GraphRequest nextRequest = response.getRequestForPagedResults(GraphResponse.PagingDirection.NEXT);
Utils.log("get_paging_data was called");
nextRequest.setCallback(new GraphRequest.Callback() {
#Override
public void onCompleted(GraphResponse response) {
JSONObject json = response.getJSONObject();
if (json != null) {
try {
JSONArray friends_json_array = json.getJSONArray(DATA_TAG);
for (int i = 0; i < friends_json_array.length(); i++) {
HashMap<String, String> friend_hashmap = new HashMap<String, String>();
JSONObject friend_json = friends_json_array.getJSONObject(i);
friend_hashmap.put(USER_FB_ID_TAG, friend_json.getString(USER_FB_ID_TAG));
friend_hashmap.put(F_NAME_TAG, friend_json.getString(F_NAME_TAG));
friend_hashmap.put(L_NAME_TAG, friend_json.getString(L_NAME_TAG));
friend_hashmap.put(FULL_NAME_TAG, friend_json.getString(FULL_NAME_TAG));
friend_hashmap.put(GENDER_TAG, friend_json.getString(GENDER_TAG));
friend_hashmap.put(UPDATED_TIME_TAG, friend_json.getString(UPDATED_TIME_TAG));
friend_hashmap.put(LINK_TAG, friend_json.getString(LINK_TAG));
JSONObject friend_pic_wrapper = json.getJSONObject(PICTURE_TAG);
JSONObject friend_pic_data = friend_pic_wrapper.getJSONObject(DATA_TAG);
if (!friend_pic_data.getBoolean(IS_SILHOUETTE_TAG)) {
friend_hashmap.put(URL_TAG, friend_pic_data.getString(URL_TAG));
}
user_fb_friends.add(friend_hashmap);
Utils.log("A friend was added to user_fb_friends (" + i + ")");
}
JSONObject paging_wrapper = json.getJSONObject(PAGING_TAG);
String next_friends_json_url = null;
if (paging_wrapper.getString(NEXT_TAG) != null) {
next_friends_json_url = paging_wrapper.getString(NEXT_TAG);
}
JSONObject summary_wrapper = json.getJSONObject(SUMMARY_TAG);
if (next_friends_json_url != null) {
/*
* 3. Send a GET request for the next JSONObject
*/
get_paging_data(response);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
});
response = nextRequest.executeAndWait();
}
Before you go ahead and try to pars your JSON, first check what your JSON will look like. You can check that using Facebook's Graph Explorer at: https://developers.facebook.com/tools/explorer/
IMPORTANT: Only friends who installed this app are returned in API v2.0 and higher. total_count in summary represents the total number of friends, including those who haven't installed the app. More >>