我正在尝试使用图形api在Codename中获取Facebook Feed，但它仅适用于我自己的帐户，每当其他用户尝试使用我的应用程序获取其Feed时，就会抛出错误。
以下是我的代码
public class Test {
private Form current;
private Resources theme;
Form facebook;
Toolbar tb;
Image user;
Label userLabel;
Label username;
Login loginfb;
String clientId = "158093724691158";
String redirectURI = "http://www.codenameone.com/";
String clientSecret = "4f5b275ae702f7b6fde9bc50bfe3b5e3";
Label proLabel;
Label fname;
Label fmail;
Label fgender;
Container container12;
public void init(Object context) {
theme = UIManager.initFirstTheme("/theme");
// Enable Toolbar on all Forms by default
Toolbar.setGlobalToolbar(true);
// Pro only feature, uncomment if you have a pro subscription
// Log.bindCrashProtection(true);
}
public void start() {
if(current != null){
current.show();
return;
}
try{
Splash spl = new Splash();
spl.show();
new java.util.Timer().schedule(
new java.util.TimerTask() {
@Override
public void run() {
facebook.show();
}
} , 4000);
}catch(IOException e){
e.printStackTrace();
}
facebook = new Form("Facebook", new BoxLayout(BoxLayout.Y_AXIS));
tb = new Toolbar();
facebook.setToolbar(tb);
user = theme.getImage("user.png");
userLabel = new Label(user);
username = new Label("Visitor");
Button facebooklogin = new Button("Login with Facebook");
Button linked = new Button("Login with LinkedIn");
//linked.setUIID("linkedButton");
linked.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent evt) {
Oauth2 auth2 = new Oauth2("https://www.linkedin.com/oauth/v2/authorization?response_type=code",
"81lq3qpacjvkcu",
"https://www.codenameone.com","r_fullprofile%20r_emailaddress","https://www.linkedin.com/uas/oauth2/accessToken","vzwWfamZ3IUQsJQL");
Oauth2.setBackToParent(true);
auth2.showAuthentication(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
if (evt.getSource() instanceof String) {
String token = (String) evt.getSource();
String expires = Oauth2.getExpires();
System.out.println("Token=" +token + "Expires in " +expires );
} else {
Exception err = (Exception) evt.getSource();
err.printStackTrace();
Dialog.show("Error", "An error occurred while logging in: " + err, "OK", null);
}
}
});
}
});
facebooklogin.addActionListener((evt) -> {
Login fb = FacebookConnect.getInstance();
fb.setClientId(clientId);
fb.setRedirectURI(redirectURI);
fb.setClientSecret(clientSecret);
fb.setScope("user_birthday,user_religion_politics,user_relationships,user_relationship_details,user_hometown,user_location,user_likes,user_education_history,user_work_history,user_website,user_events,user_photos,user_videos,user_friends,user_about_me,user_status,user_games_activity,user_tagged_places,user_posts,rsvp_event,email,read_insights,publish_actions,read_audience_network_insights,read_custom_friendlists,user_action.books,user_action.music,user_action.video,user_action.news,user_action.fitness,user_managed_groups,manage_pages,pages_manage_cta,pages_manage_instant_articles,pages_show_list,publish_pages,read_page_mailboxes,ads_management,ads_read,business_management,pages_messaging,pages_messaging_phone_number,pages_messaging_subscriptions,pages_messaging_payments,public_profile");
loginfb = fb;
fb.setCallback(new LoginListener(LoginListener.FACEBOOK));
if(!fb.isUserLoggedIn()){
fb.doLogin();
}else{
showFacebookUser(fb.getAccessToken().getToken());
}
});
Container container1 = BoxLayout.encloseY(userLabel,username);
container1.setUIID("container1");
tb.addComponentToSideMenu(container1);
tb.addCommandToSideMenu("Home", FontImage.createMaterial(FontImage.MATERIAL_HOME, UIManager.getInstance().getComponentStyle("TitleCommand")), (evt) -> {
});
tb.addCommandToSideMenu("Shop by Category", FontImage.createMaterial(FontImage.MATERIAL_ADD_SHOPPING_CART, UIManager.getInstance().getComponentStyle("TitleCommand")), (evt) -> {
});
tb.addCommandToSideMenu("Todays Deals", FontImage.createMaterial(FontImage.MATERIAL_LOCAL_OFFER, UIManager.getInstance().getComponentStyle("TitleCommand")), (evt) -> {
});
tb.addCommandToSideMenu("Your Orders", FontImage.createMaterial(FontImage.MATERIAL_BOOKMARK_BORDER, UIManager.getInstance().getComponentStyle("TitleCommand")), (evt) -> {
});
tb.addCommandToSideMenu("Your Wish List", FontImage.createMaterial(FontImage.MATERIAL_LIST, UIManager.getInstance().getComponentStyle("TitleCommand")), (evt) -> {
});
tb.addCommandToSideMenu("Your Account", FontImage.createMaterial(FontImage.MATERIAL_ACCOUNT_BOX, UIManager.getInstance().getComponentStyle("TitleCommand")), (evt) -> {
});
tb.addCommandToSideMenu("Gift Cards", FontImage.createMaterial(FontImage.MATERIAL_CARD_GIFTCARD, UIManager.getInstance().getComponentStyle("TitleCommand")), (evt) -> {
});
tb.addCommandToSideMenu("Setting", FontImage.createMaterial(FontImage.MATERIAL_SETTINGS, UIManager.getInstance().getComponentStyle("TitleCommand")), (evt) -> {
});
tb.addCommandToSideMenu("Logout", FontImage.createMaterial(FontImage.MATERIAL_BACKSPACE, UIManager.getInstance().getComponentStyle("TitleCommand")), (evt) -> {
});
Tabs tab = new Tabs();
Style s = UIManager.getInstance().getComponentStyle("Tab");
FontImage icon1 = FontImage.createMaterial(FontImage.MATERIAL_VPN_KEY, s);
FontImage icon2 = FontImage.createMaterial(FontImage.MATERIAL_LIST, s);
FontImage icon3 = FontImage.createMaterial(FontImage.MATERIAL_ACCOUNT_BOX, s);
Container container11 = BoxLayout.encloseY(facebooklogin,linked);
container12 = BoxLayout.encloseY(new SpanLabel("Some text directly in the tab2"));
Image pro = theme.getImage("user.png");
proLabel = new Label(pro);
Label uname = new Label("Name: ");
fname = new Label("");
Label umail = new Label("Name: ");
fmail = new Label("");
Label ugender = new Label("Name: ");
fgender = new Label("");
Container profileContainer = TableLayout.encloseIn(2, uname,fname,umail,fmail,ugender,fgender);
Container container13 = BoxLayout.encloseY(proLabel,profileContainer);
tab.addTab("Log In",icon1,container11 );
tab.addTab("Wall",icon2, container12 );
tab.addTab("User Profile",icon3, container13);
facebook.add(tab);
}
public void showFacebookUser(String token){
ConnectionRequest conn = new ConnectionRequest(){
@Override
protected void readResponse(InputStream input) throws IOException {
JSONParser parser = new JSONParser();
Map<String, Object> parsed = parser.parseJSON(new InputStreamReader(input, "UTF-8"));
String email = null;
if(email == null){
email=" ";
}
email = (String) parsed.get("email");
String name = (String) parsed.get("name");
String first_name = (String) parsed.get("first_name");
String last_name = (String) parsed.get("last_name");
String gender = (String) parsed.get("gender");
String image = (String) ((Map) ((Map) parsed.get("picture")).get("data")).get("url").toString();
ArrayList<String> data_arr1= (ArrayList) ((Map) parsed.get("feed")).get("data");
JSONArray array = new JSONArray(data_arr1);
Log.p("First NAme : " + first_name);
Log.p("Last Name : " + last_name);
Log.p("Email : " + email);
Log.p("Full Name : " + name);
Log.p("Gender : " + gender);
Log.p("Picture : " +image);
username.setText(name);
userLabel.setIcon(URLImage.createToStorage((EncodedImage) user, "Small_"+image, image, URLImage.RESIZE_SCALE));
proLabel.setIcon(URLImage.createToStorage((EncodedImage) user, image, image, URLImage.RESIZE_SCALE));
fname.setText(name);
fmail.setText(email);
fgender.setText(gender);
ArrayList<String> arrayList = new ArrayList<>();
try{
JSONArray array2 = new JSONArray(array.toString());
for(int i =0; i<array2.length() ; i++){
JSONObject jsonobject = array2.getJSONObject(i);
String story = null;
if(story == null){
story=" ";
}
try {
story = jsonobject.getString("story");
} catch (Exception e) {
e.printStackTrace();
}
String msg = null;
if(msg == null){
msg=" ";
}
try {
msg = jsonobject.getString("message");
} catch (Exception e) {
e.printStackTrace();
}
String full_picture = null;
if(full_picture == null){
full_picture=" ";
}
try{
full_picture = jsonobject.getString("full_picture");
}
catch(Exception e){
e.printStackTrace();
}
Log.p(story);
Log.p(msg);
Log.p(full_picture);
Image wallimage = theme.getImage("blank.jpg");
Label wallimageLabel = new Label(wallimage);
wallimageLabel.setIcon(URLImage.createToStorage((EncodedImage) wallimage, full_picture, full_picture, URLImage.RESIZE_SCALE));
Label wallstory = new Label(story);
Label wallmessage = new Label(msg);
Container wallcontainer = BoxLayout.encloseY(wallmessage,wallstory,wallimageLabel);
container12.add(wallcontainer);
}
}catch(Exception e){
e.printStackTrace();
}
}
};
conn.setPost(false);
conn.setUrl("https://graph.facebook.com/v2.8/me");
conn.addArgumentNoEncoding("access_token", token); //this statement is used to patch access token with url
conn.addArgumentNoEncoding("fields", "email,name,first_name,last_name,gender,picture.width(512).height(512),feed{name,full_picture,message,story},posts");
//above statement is used to provide permission through url so server send data with respect ot permissions.
NetworkManager.getInstance().addToQueue(conn);
}
public void stop() {
current = Display.getInstance().getCurrent();
if(current instanceof Dialog) {
((Dialog)current).dispose();
current = Display.getInstance().getCurrent();
}
}
public void destroy() {
}
public class LoginListener extends LoginCallback {
public static final int FACEBOOK = 0;
private int loginType;
public LoginListener(int loginType) {
this.loginType = loginType;
}
public void loginSuccessful() {
try {
AccessToken token = loginfb.getAccessToken();
if (loginType == FACEBOOK) {
showFacebookUser(token.getToken());
}
} catch (Exception e) {
e.printStackTrace();
}
}
public void loginFailed(String errorMessage) {
Dialog.show("Login Failed", errorMessage, "Ok", null);
}
}
}
并抛出以下错误：
java.lang.NullPointerException
at com.grv.test.Test$3.readResponse(Test.java:220)
at com.codename1.io.ConnectionRequest.performOperation(ConnectionRequest.java:733)
at com.codename1.io.NetworkManager$NetworkThread.run(NetworkManager.java:282)
at com.codename1.impl.CodenameOneThread.run(CodenameOneThread.java:176)
java.lang.NullPointerException
at com.grv.test.Test$3.readResponse(Test.java:220)
at com.codename1.io.ConnectionRequest.performOperation(ConnectionRequest.java:733)
at com.codename1.io.NetworkManager$NetworkThread.run(NetworkManager.java:282)
at com.codename1.impl.CodenameOneThread.run(CodenameOneThread.java:176)
我只是想知道为什么这个应用程序无法从其他用户帐户获取facebook提要。