问题
I am developed a app in android in which i fetch user details from Facebook. I am able to fetch user name, firstname, lastname but email comes null in some Facebook account. In some Facebook account I found email id and some Facebook account email is null why?
回答1:
The problem is the email permission this is the working code for getting email id. It is given by me here Unable to access facebook login?
Session.openActiveSession(this, true, new Session.StatusCallback() {
// callback when session changes state
@Override
public void call(Session session, SessionState state,
Exception exception) {
if (session.isOpened()) {
// make request to the /me API
List<String> permissions = session.getPermissions();
if (!isSubsetOf(PERMISSIONS, permissions)) {
pendingPublishReauthorization = true;
Session.NewPermissionsRequest newPermissionsRequest = new Session.NewPermissionsRequest(
RegisterActivity.this, PERMISSIONS);
session.requestNewReadPermissions(newPermissionsRequest);
return;
}
Request.executeMeRequestAsync(session,
new Request.GraphUserCallback() {
// callback after Graph API response with
// user object
@Override
public void onCompleted(GraphUser user,
Response response) {
if (user == null) {
Toast.makeText(
RegisterActivity.this
.getApplicationContext(),
"Facebook Error",
Toast.LENGTH_LONG).show();
} else {
Toast.makeText(
RegisterActivity.this
.getApplicationContext(),
user.getName()
+ " Logged in Successfully.",
Toast.LENGTH_LONG).show();
GraphUser abc = user;
id = user.getId();
name = user.getName();
gender = user.getProperty("gender")
.toString();
editname.setText(name);
username.setText(user.getUsername());
JSONObject jo = user
.getInnerJSONObject();
Log.d("Details", jo.toString());
try {
emailid.setText(user
.getProperty("email")
.toString());
} catch (Exception e1) {
// TODO Auto-generated catch
// block
e1.printStackTrace();
}
try {
location = user.getLocation()
.getProperty("name")
.toString();
} catch (Exception e) {
e.printStackTrace();
}
}
return;
}
});
}
}
});
Put onActivityResult Method
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
Session.getActiveSession().onActivityResult(this, requestCode,
resultCode, data);
}
isSubsetoff() Method
private boolean isSubsetOf(Collection<String> subset,
Collection<String> superset) {
for (String string : subset) {
if (!superset.contains(string)) {
return false;
}
}
return true;
}
and the permissions as per your need
private static final List<String> PERMISSIONS = Arrays.asList("email",
"user_about_me", "user_location");
来源：https://stackoverflow.com/questions/17848764/fetch-facebook-user-details-in-android