How AccountManager knows what Google account to use?

Question

I am trying to implement Google rest api for Drive V3 in Android.

But I am getting authError

{
   "error":{
      "errors":[
         {
            "domain":"global",
            "reason":"authError",
            "message":"Invalid Credentials",
            "locationType":"header",
            "location":"Authorization"
         }
      ],
      "code":401,
      "message":"Invalid Credentials"
   }
}

I use AccountManager to get token from user, and I think it access the wrong console account.
How does it know what account to access?

This is my AccountManager code, I successfully get user token. Also I invalidate it before with AccountManager.invalidateAuthToken

    Bundle options = new Bundle();
    options.putString(AccountManager.KEY_ANDROID_PACKAGE_NAME, context.getPackageName());
    accountManager.getAuthToken(account, scope, options, context,
            callback, null);

Answer 1

As per the Account Manager docs for [getAuthToken]( http://developer.android.com/reference/android/accounts/AccountManager.html#getAuthToken(android.accounts.Account , java.lang.String, android.os.Bundle, android.app.Activity, android.accounts.AccountManagerCallback, android.os.Handler)):

Gets an auth token of the specified type for a particular account, prompting the user for credentials if necessary . This method is intended for applications running in the foreground where it makes sense to ask the user directly for a password.

If a previously generated auth token is cached for this account and type, then it is returned . Otherwise, if a saved password is available, it is sent to the server to generate a new auth token. Otherwise, the user is prompted to enter a password.

It seems that it may depend on the value of your account variable that you are passing in the getAuthToken() .

You probably already have this in, but gonna included in for the community, did you include the USE_CREDENTIALS permission as mentioned in the docs:

NOTE : If targeting your app to work on API level 22 and before, USE_CREDENTIALS permission is needed for those platforms.

Hope this helps. Good luck. :)