ch.ethz.twimight.activities.UserListActivity.java Source code

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Here is the source code for ch.ethz.twimight.activities.UserListActivity.java

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/*******************************************************************************
 * Copyright (c) 2011 ETH Zurich.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v2.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * 
 * Contributors:
 *     Paolo Carta - Implementation
 *     Theus Hossmann - Implementation
 *     Dominik Schatzmann - Message specification
 ******************************************************************************/
package ch.ethz.twimight.activities;

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

import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.FragmentManager;
import android.content.Intent;
import android.os.Bundle;
import android.support.v13.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.Log;
import ch.ethz.twimight.R;
import ch.ethz.twimight.fragments.FollowersFragment;
import ch.ethz.twimight.fragments.FriendsFragment;
import ch.ethz.twimight.fragments.ListFragment;
import ch.ethz.twimight.fragments.PeersFragment;
import ch.ethz.twimight.listeners.TabListener;

/**
 * Display a list of users (friends, followers, etc.)
 * 
 * @author thossmann
 * 
 */
public class UserListActivity extends TwimightBaseActivity {

    private static final String TAG = UserListActivity.class.getName();

    public static final String EXTRA_KEY_INITIAL_TAB = "EXTRA_KEY_INITIAL_TAB";
    public static final String EXTRA_INITIAL_TAB_FOLLOWERS = "EXTRA_INITIAL_TAB_FOLLOWERS";
    public static final String EXTRA_INITIAL_TAB_FOLLOWING = "EXTRA_INITIAL_TAB_FOLLOWING";
    public static final String EXTRA_INITIAL_TAB_PEERS = "EXTRA_INITIAL_TAB_PEERS";

    private int positionIndex;
    private int positionTop;
    ViewPager mViewPager;

    private final List<ListFragment> mFragments = new ArrayList<ListFragment>();

    /**
     * Called when the activity is first created.
     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(null);
        setContentView(R.layout.main);

        // action bar
        actionBar = getActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        mFragments.add(new FriendsFragment());
        mFragments.add(new FollowersFragment());
        mFragments.add(new PeersFragment());
        FragmentPagerAdapter pagAdapter = new FragmentListPagerAdapter(getFragmentManager());

        mViewPager = (ViewPager) findViewById(R.id.viewpager);

        mViewPager.setAdapter(pagAdapter);
        mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
            @Override
            public void onPageSelected(int position) {
                // When swiping between pages, select the
                // corresponding tab.
                getActionBar().setSelectedNavigationItem(position);
            }
        });

        Tab tab = actionBar.newTab().setText(R.string.friends).setTabListener(new TabListener(mViewPager));
        actionBar.addTab(tab);

        tab = actionBar.newTab().setText(R.string.followers).setTabListener(new TabListener(mViewPager));
        actionBar.addTab(tab);

        tab = actionBar.newTab().setText(R.string.peers).setTabListener(new TabListener(mViewPager));
        actionBar.addTab(tab);

        setInitialTab(getIntent());
    }

    @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);
        setInitialTab(intent);
    }

    private void setInitialTab(Intent intent) {
        int initialPosition = 0;
        if (intent.hasExtra(EXTRA_KEY_INITIAL_TAB)) {
            String initialTab = intent.getStringExtra(EXTRA_KEY_INITIAL_TAB);

            if (EXTRA_INITIAL_TAB_FOLLOWING.equals(initialTab)) {
                initialPosition = 0;
            } else if (EXTRA_INITIAL_TAB_FOLLOWERS.equals(initialTab)) {
                initialPosition = 1;
            } else if (EXTRA_INITIAL_TAB_PEERS.equals(initialTab)) {
                initialPosition = 2;
            }
            intent.removeExtra(EXTRA_KEY_INITIAL_TAB);
        }
        mViewPager.setCurrentItem(initialPosition);
    }

    /**
     * Saves the current selection
     */
    @Override
    public void onSaveInstanceState(Bundle savedInstanceState) {

        // positionIndex = userListView.getFirstVisiblePosition();
        // View v = userListView.getChildAt(0);
        // positionTop = (v == null) ? 0 : v.getTop();
        savedInstanceState.putInt("positionIndex", positionIndex);
        savedInstanceState.putInt("positionTop", positionTop);

        Log.i(TAG, "saving" + positionIndex + " " + positionTop);

        super.onSaveInstanceState(savedInstanceState);
    }

    /**
     * Loads the current user selection
     */
    @Override
    public void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);

        positionIndex = savedInstanceState.getInt("positionIndex");
        positionTop = savedInstanceState.getInt("positionTop");

    }

    private class FragmentListPagerAdapter extends FragmentPagerAdapter {
        public FragmentListPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public ListFragment getItem(int position) {
            return mFragments.get(position);
        }

        @Override
        public int getCount() {
            return mFragments.size();
        }

    }

}