can't get access token using refresh token - oauth

Question

I wrote desktop application on java, which have access to the Google drive. (it just uploads and downloads files).
At the moment access type is online. when I need to access files/folders to the drive, I
redirect he browser to a Google URL and get access code:
String code = "code that was returned from brouser"
GoogleTokenResponse response = flow.newTokenRequest(code).setRedirectUri(REDIRECT_URI).execute();
GoogleCredential credential = new GoogleCredential().setFromTokenResponse(response);
everything works well! but I need to have that redirection only first time.
When I google, in the Google Drive API documentation I found that I can get refresh token via browser redirection and save it on DB for instance. (In the other word, I can use offline access).
And every time when I need to read data from google drive, I get access token using refresh token without redirection. is not it?
so I get refresh token like that:
https://accounts.google.com/o/oauth2/auth?access_type=offline&client_id=695230079990.apps.googleusercontent.com&scope=https://www.googleapis.com/auth/drive&response_type=code&redirect_uri=https://localhost
question 1
I get code, from the browser redirecting. it's refresh token, is not it?
now, I need to get access token using that refresh token.
$.ajax({
type: "POST",
url: 'https://accounts.google.com/o/oauth2/token',
data: {
client_id: "695230079990.apps.googleusercontent.com",
client_secret: 'OWasYmp7YQ...4GJaPjP902R',
refresh_toke: '4/hBr......................xwJCgQI',
grant_type: 'refresh_token'
},
success: function(response) {
alert(response);
}
});
but I have error 400;
question 2) when I try to change redirect url I have that error: *
Invalid parameter value for redirect_uri: Non-public domains not allowed: https://sampl.ecom
so, must I create web applications Client ID , instead of installed application from google APIs console? Can't I change Redirect URI in installed application? I'm confused, I don't know, which should I use.

Answer 1

1) when you try to have offline access, you get authorization code which may be redeemed for an access token and a refresh token.
For isntance:
https://accounts.google.com/o/oauth2/auth?access_type=offline
&approval_prompt=auto
&client_id=[your id]
&redirect_uri=[url]
&response_type=code
&scope=[access scopes]
&state=/profile
after you get authorization code, you cat get refresh token.
static Credential exchangeCode(String authorizationCode)
throws CodeExchangeException {
try {
GoogleAuthorizationCodeFlow flow = getFlow();
GoogleTokenResponse response =
flow.newTokenRequest(authorizationCode).setRedirectUri(REDIRECT_URI).execute();
return flow.createAndStoreCredential(response, null);
} catch (IOException e) {
System.err.println("An error occurred: " + e);
throw new CodeExchangeException(null);
}
}
See the section on Implementing Server-side Authorization tokens for more information.
and after you get refresh token , you must save it. see that sample for mor information.
2) If you don't have installed application, you should create web applications to change redirecting URL.