API Version

//Dropbox variables
final static private String DROPBOX_APP_KEY = "Key Here";
final static private String DROPBOX_APP_SECRET = "App Secret Here";
final static private AccessType DROPBOX_ACCESS_TYPE = AccessType.DROPBOX;
public DropboxAPI<AndroidAuthSession> mDBApi;


private void initializeDropbox() {
    AppKeyPair appKeys = new AppKeyPair(DROPBOX_APP_KEY, DROPBOX_APP_SECRET);
    AndroidAuthSession session = new AndroidAuthSession(appKeys, DROPBOX_ACCESS_TYPE);
    mDBApi = new DropboxAPI<AndroidAuthSession>(session);
    //Create DropboxUtil class that will be used in this app's Javascript 
    DropboxUtils dropboxUtils = new DropboxUtils(this, appView);
    appView.addJavascriptInterface(dropboxUtils, "DropboxUtils");
    ///////
}

import com.dropbox.client2.DropboxAPI;
import com.dropbox.client2.android.AndroidAuthSession;
import com.dropbox.client2.session.AccessTokenPair;
import com.dropbox.client2.session.AppKeyPair;
import com.dropbox.client2.session.Session.AccessType;  



public boolean isDropBoxAuthenticated() {
    String key    = mPrefs.getString("dropboxAuthKey", null);
    String secret = mPrefs.getString("dropboxAuthSecret", null);

    if (key != null && secret != null) {
        if (mDBApi.getSession().isLinked())
            return true;
        else {
            AccessTokenPair access = new AccessTokenPair(key, secret);
            mDBApi.getSession().setAccessTokenPair(access);             
        }

        if (mDBApi.getSession().isLinked())
           return true;
        else 
           return false;
    }
    return false;
}

public void dropBoxAuthenticate(String queryParams) {
        SharedPreferences.Editor ed = mPrefs.edit();
        ed.putString("queryParams", queryParams); 
        ed.putBoolean("dbAuthenticating", true);
        ed.commit();
        //Log.i(LOG_TAG, "**queryParams " + queryParams);
        mDBApi.getSession().startAuthentication(App.this);
}

protected void onResume() {
    super.onResume();

    boolean dbAuthenticating = mPrefs.getBoolean("dbAuthenticating", false);
    if (mDBApi.getSession().authenticationSuccessful() && dbAuthenticating) {
        try {
            // MANDATORY call to complete auth.
            // Sets the access token on the session
            mDBApi.getSession().finishAuthentication();

            AccessTokenPair tokens = mDBApi.getSession().getAccessTokenPair();

            // Provide your own storeKeys to persist the access token pair
            // A typical way to store tokens is using SharedPreferences
            SharedPreferences.Editor ed = mPrefs.edit();
            ed.putString("dropboxAuthKey", tokens.key);
            ed.putString("dropboxAuthSecret", tokens.secret);               
            String queryParams = mPrefs.getString("queryParams", null);
            ed.remove("queryParams");
            ed.remove("dbAuthenticating");
            ed.commit();
            super.loadUrl("file:///android_asset/www/dropboxFileBrowser.html" + (queryParams == null ? " : queryParams));
        } catch (IllegalStateException e) {
            //Log.i(LOG_TAG, e.getMessage());
        }
    } else {
        if (mPrefs.getBoolean("appInit", true) == true) {
            //This condition occurs because of displaying the splash screen
            SharedPreferences.Editor ed = mPrefs.edit();
            ed.putBoolean("appInit", false);            
            ed.commit();
        } else {
            String queryParams = mPrefs.getString("queryParams", " ");
            if (queryParams.indexOf("editProfile") != -1) {
                //This condition occurs if the user cancels dropbox authentication 
                //and facebook authentication
                SharedPreferences.Editor ed = mPrefs.edit();
                ed.remove("queryParams");
                ed.commit();
                super.loadUrl("file:///android_asset/www/profile.html?editProfile=1");
            }
            else if (nativeAppLoggedIn()) {
                //Log.i(LOG_TAG, "**Going to index");
               super.loadUrl("file:///android_asset/www/index.html");
            }
            else {
                //Log.i(LOG_TAG, "**Going to login");
               //super.loadUrl("file:///android_asset/www/login.html");
            }
        }
    }
}