I'm using the AccountManager getAuthToken(..) method to retrieve a token
for Google Calendar sync.
While sync works in most cases, several users report the following error
when trying to get the calendarList of the Google calendar API:
com.google.api.client.googleapis.json.GoogleJsonResponseException: 401
Unauthorized{"code" : 401,"errors" : [ {"domain" : "global","location" :
"Authorization","locationType" : "header","message" : "Invalid
Credentials","reason" : "authError"} ],"message" : "Invalid Credentials"}
Their native Android calendar app continues to sync normally.i.e., they do have
internet connection and they do have registered accounts on their device.Here
is what I do:
AccountManager accountManager = AccountManager.get(this);Account[] accounts =
accountManager.getAccountsByType("com.google");...//for each
account:...accountManager.invalidateAuthToken(account.type,
null);accountManager.getAuthToken(account,
"oauth2:https://www.googleapis.com/auth/calendar";, true, new
AccountManagerCallback<Bundle>(){ public void
run(AccountManagerFuture<Bundle> future) { try{
Bundle bundle = future.getResult();
if(bundle.containsKey(AccountManager.KEY_AUTHTOKEN)) {
String token = bundle.getString(AccountManager.KEY_AUTHTOKEN);
AfterGetToken(token); }else {
if(bundle.containsKey(AccountManager.KEY_INTENT)) {
Intent intent = bundle.getParcelable(AccountManager.KEY_INTENT);
intent.setFlags(intent.getFlags() & ~Intent.FLAG_ACTIVITY_NEW_TASK);
activity.startActivityForResult(intent,
REQUEST_AUTHENTICATE); //->start all over in
onActivityResult } }
}catch(Exception e){ e.printStackTrace();
invalidateToken(account, null); //->start again }
} }, null);
private void AfterGetToken(String myToken){
GoogleCredential credential = new
GoogleCredential().setAccessToken(myToken);
CalendarService = new
com.google.api.services.calendar.Calendar.Builder(transport,
new JacksonFactory(), null)
.setApplicationName(MY_APP_NAME)
.setHttpRequestInitializer(credential)
.setJsonHttpRequestInitializer(new JsonHttpRequestInitializer() {
public void initialize(JsonHttpRequest request) throws IOException {
com.google.api.services.calendar.CalendarRequest calendarRequest =
(CalendarRequest) request;
calendarRequest.setKey(MY_API_KEY);
calendarRequest.setOauthToken(credential.getAccessToken());
}
}).build();
CalendarList calendarList = null;
* try*{
calendarList = CalendarService.calendarList().list().execute();
}*catch* (Exception e) {
e.printStackTrace();
}
....//do stuff with calendarList
}
//These are my imports:
*import* android.accounts.Account;
*import* android.accounts.AccountManager;
*import* com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
*import* com.google.api.client.http.HttpTransport;
*import* com.google.api.client.http.javanet.NetHttpTransport;
*import* com.google.api.client.http.json.JsonHttpRequest;
*import* com.google.api.client.http.json.JsonHttpRequestInitializer;
*import* com.google.api.client.json.jackson.JacksonFactory;
*import* com.google.api.services.calendar.CalendarRequest;
*import* com.google.api.services.calendar.model.*CalendarList*;
Thanks for your help!
Christopher
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