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Android: Facebook session sharing through actions

I am going to go through a Facebook session through actions. I saw an example from the Facebook SDK, and someone said that the "Simple" example has this way:https://github.com/facebook/facebook-android-sdk/blob/master/examples/simple/src/com/facebook/android/SessionStore.java

But how does it work? In mine MainActivity, I have this:

mPrefs = getPreferences(MODE_PRIVATE);
String accessToken = mPrefs.getString("access_token", null);
long expires = mPrefs.getLong("access_expires", 0);
if (accessToken != null) {
    //We have a valid session! Yay!
    facebook.setAccessToken(accessToken);
}
if (expires != 0) {
    //Since we're not expired, we can set the expiration time.
    facebook.setAccessExpires(expires);
}

//Are we good to go? If not, call the authentication menu.
if (!facebook.isSessionValid()) {
    facebook.authorize(this, new String[] { "email", "publish_stream" }, new DialogListener() {
        @Override
        public void onComplete(Bundle values) {
        }

        @Override
        public void onFacebookError(FacebookError error) {
        }

        @Override
        public void onError(DialogError e) {
        }

        @Override
        public void onCancel() {
        }
    });
}

But how can I pass this on to my work PhotoActivity? Is there an example implementation?

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3 answers

Using SharedPreferences to pass data through actions is not a good idea. SharedPreferences used to store some data in memory when the application is reloaded or the device is rebooted.

Instead, you have two options:

  • facebook, , , .

  • , , facebook, . :

    // simple class that just has one member property as an example
public class MyParcelable implements Parcelable {
    private int mData;

    /* everything below here is for implementing Parcelable */

    // 99.9% of the time you can just ignore this
    public int describeContents() {
        return 0;
    }

    // write your object data to the passed-in Parcel
    public void writeToParcel(Parcel out, int flags) {
        out.writeInt(mData);
    }

    // this is used to regenerate your object. All Parcelables must have a CREATOR that implements these two methods
    public static final Parcelable.Creator<MyParcelable> CREATOR = new Parcelable.Creator<MyParcelable>() {
        public MyParcelable createFromParcel(Parcel in) {
            return new MyParcelable(in);
        }

        public MyParcelable[] newArray(int size) {
            return new MyParcelable[size];
        }
    };

    // example constructor that takes a Parcel and gives you an object populated with it values
    private MyParcelable(Parcel in) {
        mData = in.readInt();
    }
}
+4

FB SDK 3.5, FB , Session :

private void onSessionStateChange(Session session, SessionState state, Exception exception) {
    if (exception instanceof FacebookOperationCanceledException || exception instanceof FacebookAuthorizationException) {
        new AlertDialog.Builder(this).setTitle(R.string.cancelled).setMessage(R.string.permission_not_granted).setPositiveButton(R.string.ok, null).show();

    } else {

        Session session = Session.getActiveSession();

        if ((session != null && session.isOpened())) {
            // Kill login activity and go back to main
            finish();
            Intent intent = new Intent(getApplicationContext(), MainActivity.class);
            intent.putExtra("fb_session", session);
            startActivity(intent);
        }
    }
}

MainActivity onCreate(), :

Bundle extras = getIntent().getExtras();
if (extras != null) {           
    Session.setActiveSession((Session) extras.getSerializable("fb_session"));
}
+2

The example pretty much has the whole implementation. You just use SharedPreferencesto store the session. When you need it in PhotoActivity, just look in SharedPreferencesagain (perhaps using static methods SessionStoreif you follow the same template) to get a previously saved Facebook session.

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