Question

I have this code in 1 activity :

  mPrefs = getPreferences(MODE_PRIVATE);
        String access_token = mPrefs.getString("access_token", null);
        long expires = mPrefs.getLong("access_expires", 0);
        if(access_token != null) {
            facebook.setAccessToken(access_token);
        }
        if(expires != 0) {
            facebook.setAccessExpires(expires);
        }

        if(!facebook.isSessionValid()) {
            Log.e("Facebook Session","Invalid");
                //do facebook authorize...
        }
        else
        {
            Log.e("Facebook Session","valid");
            Intent nextActivity = new Intent (MainActivity.this, FacebookFriendsListActivity.class);

            MainActivity.this.startActivity(nextActivity);
        }

Which does as excpeted, showing session as “valid” and starting new activity,
But in the new activity i use exact same code, though the data returning from the SharedPreferance is null. the other activity is a ListActivity if it makes any difference.

This is the code in 2nd activity :

            Log.e("Login","entered func");
          mPrefs = getPreferences(MODE_PRIVATE);
            String access_token = mPrefs.getString("access_token", null);
            long expires = mPrefs.getLong("access_expires", 0);
            if(access_token != null) {
                Log.e("acces_token","Isn't null");
                facebook.setAccessToken(access_token);
            }
            if(expires != 0) {
                Log.e("expires","Isn't null");
                facebook.setAccessExpires(expires);
            }

As you could probably guess, no Log has been made, besides the one showing the method is being entered.
Help any one can help me solve this bizzare problem?

Answer 1

That’s because you are using activity private preferences. See the documentation of the method you are using getPreferences . Private to THAT activity!

Use this instead:

getSharedPreferences("some_identifier", MODE_PRIVATE);