Facebook Scrumptious无法通过身份验证

Question

I am new to android and was trying the Facebook login tutorial on following URl: https://developers.facebook.com/docs/android/scrumptious/authenticate/

I have created app exactly as explained in the tutorial. However, when i try to authenticate using facebook it fails. No error is shown in logcat. Everything seems fine, not even a single error, still its not authenticating.

Here is the code, its exactly same as in tutorial.

package com.l****.n****;

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;

import com.facebook.Session;
import com.facebook.SessionState;
import com.facebook.UiLifecycleHelper;

public class MainActivity extends FragmentActivity {

    private static final int SPLASH = 0;
    private static final int SELECTION = 1;
    private static final int FRAGMENT_COUNT = SELECTION +1;
    private static final String TAG = null;

    private Fragment[] fragments = new Fragment[FRAGMENT_COUNT];

    private boolean isResumed = false;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        uiHelper = new UiLifecycleHelper(this, callback);
        uiHelper.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        FragmentManager fm = getSupportFragmentManager();
        fragments[SPLASH] = fm.findFragmentById(R.id.splashFragment);
        fragments[SELECTION] = fm.findFragmentById(R.id.selectionFragment);

        FragmentTransaction transaction = fm.beginTransaction();
        for(int i = 0; i < fragments.length; i++) {
            transaction.hide(fragments[i]);
        }
        transaction.commit();
    }

    private void showFragment(int fragmentIndex, boolean addToBackStack) {
        FragmentManager fm = getSupportFragmentManager();
        FragmentTransaction transaction = fm.beginTransaction();
        for (int i = 0; i < fragments.length; i++) {
            if (i == fragmentIndex) {
                transaction.show(fragments[i]);
            } else {
                transaction.hide(fragments[i]);
            }
        }
        if (addToBackStack) {
            transaction.addToBackStack(null);
        }
        transaction.commit();
    }

    @Override
    public void onResume() {
        super.onResume();
        uiHelper.onResume();
        isResumed = true;
    }

    @Override
    public void onPause() {
        super.onPause();
        uiHelper.onPause();
        isResumed = false;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        uiHelper.onDestroy();
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        uiHelper.onSaveInstanceState(outState);
    }

    private void onSessionStateChange(Session session, SessionState state, Exception exception) {
        // Only make changes if the activity is visible
        if (isResumed) {
            FragmentManager manager = getSupportFragmentManager();
            // Get the number of entries in the back stack
            int backStackSize = manager.getBackStackEntryCount();
            // Clear the back stack
            for (int i = 0; i < backStackSize; i++) {
                manager.popBackStack();
            }
            if (state.isOpened()) {
                // If the session state is open:
                // Show the authenticated fragment
                Log.i(TAG, "Logged in...");
                showFragment(SELECTION, false);
            } else if (state.isClosed()) {
                // If the session state is closed:
                // Show the login fragment
                Log.i(TAG, "Logged out...");
                showFragment(SPLASH, false);
            }
        }
    }

    @Override
    protected void onResumeFragments() {
        super.onResumeFragments();
        Session session = Session.getActiveSession();

        if (session != null && session.isOpened()) {
            // if the session is already open,
            // try to show the selection fragment
            showFragment(SELECTION, false);
        } else {
            // otherwise present the splash screen
            // and ask the person to login.
            showFragment(SPLASH, false);
        }
    }

    private UiLifecycleHelper uiHelper;
    private Session.StatusCallback callback = 
        new Session.StatusCallback() {
        @Override
        public void call(Session session, 
                SessionState state, Exception exception) {
            onSessionStateChange(session, state, exception);
        }
    };

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        uiHelper.onActivityResult(requestCode, resultCode, data);
    }
}

Please help as i have no clue what is wrong with the code. Thanks in advance.

PS: I am running it on real device android version 4.2.2

Answer 1

Check app Id and key hash are correct. If not, i would just download folder into eclipse as an existing android project.