Android™

Dropbox Refresh OAuth2 Access Token

See more Dropbox Examples

Demonstrates how to mint a new access token using the refresh token obtained when originally getting the OAuth2 access token. Android™

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean success = false;

    //  This example assumes the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    CkHttp http = new CkHttp();

    //  Implements the following CURL command:

    //  curl -X GET https://api.dropbox.com/oauth2/token \
    //      -d grant_type=refresh_token \
    //      -d refresh_token=<YOUR_REFRESH_TOKEN> \
    //      -u <YOUR_APP_KEY>:<YOUR_APP_SECRET>

    //  Use the following online tool to generate HTTP code from a CURL command
    //  Convert a cURL Command to HTTP Source Code

    http.put_Login("DROPBOX_APP_KEY");
    http.put_Password("DROPBOX_APP_SECRET");

    //  Get the refresh token from the JSON we saved when originally getting the access token.
    //  (See Get Dropbox OAuth2 Access Token w/ Refresh Token
    CkJsonObject json = new CkJsonObject();
    success = json.LoadFile("qa_data/tokens/dropbox.json");
    if (success == false) {
        Log.i(TAG, json.lastErrorText());
        return;
        }

    CkHttpRequest req = new CkHttpRequest();
    req.AddParam("grant_type","refresh_token");
    req.AddParam("refresh_token",json.stringOf("refresh_token"));

    req.put_HttpVerb("POST");
    req.put_ContentType("application/x-www-form-urlencoded");

    CkHttpResponse resp = new CkHttpResponse();
    success = http.HttpReq("https://api.dropbox.com/oauth2/token",req,resp);
    if (success == false) {
        Log.i(TAG, http.lastErrorText());
        return;
        }

    CkStringBuilder sbResponseBody = new CkStringBuilder();
    resp.GetBodySb(sbResponseBody);

    CkJsonObject jResp = new CkJsonObject();
    jResp.LoadSb(sbResponseBody);
    jResp.put_EmitCompact(false);

    Log.i(TAG, "Response Body:");
    Log.i(TAG, jResp.emit());

    int respStatusCode = resp.get_StatusCode();
    Log.i(TAG, "Response Status Code = " + String.valueOf(respStatusCode));
    if (respStatusCode >= 400) {
        Log.i(TAG, "Response Header:");
        Log.i(TAG, resp.header());
        Log.i(TAG, "Failed.");
        return;
        }

    //  Sample JSON response:
    //  (Sample code for parsing the JSON response is shown below)

    //  {
    //    "access_token": "sl.AC75WPYRqOi0mxcRqlimbV9FKHu04biz5qHwatG3MTgzFK7kLrGVlM9EgP4603tE7bWw0s1rMbTKiHsf37TUshPYvq-3r0qeBr_PrZIAibN8XOQicvboiOnqx6JrDekq-w8D-tE",
    //    "token_type": "bearer",
    //    "expires_in": 14400
    //  }

    String access_token = jResp.stringOf("access_token");
    Log.i(TAG, "New Access Token: " + access_token);

    //  Perhaps update our Dropbox JSON file with the new access token.
    //  (The existing refresh token does not change, and can be used over and over to mint new access tokens.)
    json.UpdateString("access_token",access_token);

    json.WriteFile("qa_data/tokens/dropbox.json");

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}