br.com.split.activities.FacebookFriendPickerActivity.java Source code

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Here is the source code for br.com.split.activities.FacebookFriendPickerActivity.java

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/**
 * Copyright 2010-present Facebook.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package br.com.split.activities;

import java.util.ArrayList;
import java.util.List;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import br.com.split.R;
import br.com.split.controller.SplitApplication;

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

public class FacebookFriendPickerActivity extends FragmentActivity {
    public static final String TAG = "FacebookFriendPicker";
    private static final List<String> PERMISSIONS = new ArrayList<String>() {
        private static final long serialVersionUID = -5261292506188830678L;

        {
            add("user_friends");
            add("public_profile");
        }
    };
    private static final int PICK_FRIENDS_ACTIVITY = 1;
    private UiLifecycleHelper lifecycleHelper;
    boolean pickFriendsWhenSessionOpened;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        lifecycleHelper = new UiLifecycleHelper(this, new Session.StatusCallback() {
            @Override
            public void call(Session session, SessionState state, Exception exception) {
                onSessionStateChanged(session, state, exception);
            }
        });
        lifecycleHelper.onCreate(savedInstanceState);

        ensureOpenSession();
        startPickFriendsActivity();
    }

    @Override
    protected void onStart() {
        super.onStart();
    }

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

        // Call the 'activateApp' method to log an app event for use in
        // analytics and advertising reporting. Do so in
        // the onResume methods of the primary Activities that an app may be
        // launched into.
        AppEventsLogger.activateApp(this);
    }

    @Override
    protected void onPause() {
        super.onPause();

        // Call the 'deactivateApp' method to log an app event for use in
        // analytics and advertising
        // reporting. Do so in the onPause methods of the primary Activities
        // that an app may be launched into.
        AppEventsLogger.deactivateApp(this);
    }

    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == RESULT_OK) {
            switch (requestCode) {
            case PICK_FRIENDS_ACTIVITY:
                setResult(RESULT_OK);
                finish();
                break;
            default:
                Session.getActiveSession().onActivityResult(this, requestCode, resultCode, data);
                break;
            }
        } else {
            setResult(RESULT_CANCELED);
            finish();
        }

    }

    private boolean ensureOpenSession() {
        if (Session.getActiveSession() == null || !Session.getActiveSession().isOpened()) {
            Session.openActiveSession(this, true, PERMISSIONS, new Session.StatusCallback() {
                @Override
                public void call(Session session, SessionState state, Exception exception) {
                    onSessionStateChanged(session, state, exception);
                }
            });
            return false;
        }
        return true;
    }

    private boolean sessionHasNecessaryPerms(Session session) {
        if (session != null && session.getPermissions() != null) {
            for (String requestedPerm : PERMISSIONS) {
                if (!session.getPermissions().contains(requestedPerm)) {
                    return false;
                }
            }
            return true;
        }
        return false;
    }

    private List<String> getMissingPermissions(Session session) {
        List<String> missingPerms = new ArrayList<String>(PERMISSIONS);
        if (session != null && session.getPermissions() != null) {
            for (String requestedPerm : PERMISSIONS) {
                if (session.getPermissions().contains(requestedPerm)) {
                    missingPerms.remove(requestedPerm);
                }
            }
        }
        return missingPerms;
    }

    private void onSessionStateChanged(final Session session, SessionState state, Exception exception) {
        if (state.isOpened() && !sessionHasNecessaryPerms(session)) {
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setMessage(R.string.need_perms_alert_text);
            builder.setPositiveButton(R.string.need_perms_alert_button_ok, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    session.requestNewReadPermissions(new NewPermissionsRequest(FacebookFriendPickerActivity.this,
                            getMissingPermissions(session)));
                }
            });
            builder.setNegativeButton(R.string.need_perms_alert_button_quit, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    finish();
                }
            });
            builder.show();
            startPickFriendsActivity();
        } else if (pickFriendsWhenSessionOpened && state.isOpened()) {
            pickFriendsWhenSessionOpened = false;
            startPickFriendsActivity();
        }
    }

    private boolean friendsAlreadySelected() {
        SplitApplication application = (SplitApplication) getApplication();
        return !(application.getSelectedUsers() != null && application.getSelectedUsers().size() != 0);

    }

    private void startPickFriendsActivity() {
        if (ensureOpenSession()) {
            Intent intent = new Intent(this, PickFriendsActivity.class);
            // Note: The following line is optional, as multi-select behavior is  the default for
            // FriendPickerFragment. It is here to demonstrate how parameters could be passed to the
            // friend picker if single-select functionality was desired, or if a different user ID was
            // desired (for instance, to see friends of a friend).
            PickFriendsActivity.populateParameters(intent, null, true, true, friendsAlreadySelected());
            startActivityForResult(intent, PICK_FRIENDS_ACTIVITY);
        } else {
            pickFriendsWhenSessionOpened = true;
        }
    }
}