com.indragie.cmput301as1.ExpenseClaimListActivity.java Source code

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Here is the source code for com.indragie.cmput301as1.ExpenseClaimListActivity.java

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/* 
 * Copyright (C) 2015 Indragie Karunaratne
 * 
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *  
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.indragie.cmput301as1;

import android.app.ActionBar;
import android.app.Activity;
import android.app.ActionBar.Tab;
import android.app.FragmentTransaction;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.view.Menu;
import android.view.MenuItem;

/**
 * An activity that presents a list of expense claims.
 */
public class ExpenseClaimListActivity extends FragmentActivity {
    //================================================================================
    // Constants
    //================================================================================

    private static final int USER_SETTINGS_REQUEST = 20;

    //================================================================================
    // Properties
    //================================================================================

    /**
     * Manages the user and associated preferences.
     */
    private UserManager userManager;

    /**
     * Adapter used to show fragments in the {@link ViewPager}
     */
    private ExpenseClaimPagerAdapter pagerAdapter;

    /**
     * Pager view for the owned/reviewal claims tabs.
     */
    private ViewPager pager;

    //================================================================================
    // Activity Callbacks
    //================================================================================

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

        setContentView(R.layout.activity_expense_claim_list);
        pager = (ViewPager) findViewById(R.id.pager);

        userManager = new UserManager(this);
        if (userManager.getActiveUser() == null) {
            startUserSettingsActivity();
        } else {
            setupFragments();
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
        case USER_SETTINGS_REQUEST:
            if (resultCode == Activity.RESULT_OK) {
                onUserSettingsResult(data);
            }
            break;
        default:
            super.onActivityResult(requestCode, resultCode, data);
            break;
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.expense_claim_list_activity, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case R.id.action_user_settings:
            startUserSettingsActivity();
            return true;
        default:
            return super.onOptionsItemSelected(item);
        }
    }

    /**
     * Set up fragments to display expense claim data.
     */
    private void setupFragments() {
        User user = userManager.getActiveUser();
        Session session = new Session(this, user);
        Session.setSharedSession(session);

        pagerAdapter = new ExpenseClaimPagerAdapter(this, getSupportFragmentManager(), user);
        pager.setAdapter(pagerAdapter);

        // From http://developer.android.com/training/implementing-navigation/lateral.html
        final ActionBar actionBar = getActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        ActionBar.TabListener tabListener = new ActionBar.TabListener() {
            public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
                pager.setCurrentItem(tab.getPosition());
            }

            public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) {
            }

            public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) {
            }
        };

        pager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
            @Override
            public void onPageSelected(int position) {
                actionBar.setSelectedNavigationItem(position);
            }
        });

        Tab ownedTab = actionBar.newTab().setText(R.string.tab_owned).setTabListener(tabListener);
        Tab reviewalTab = actionBar.newTab().setText(R.string.tab_reviewal).setTabListener(tabListener);

        actionBar.addTab(ownedTab);
        actionBar.addTab(reviewalTab);
    }

    /**
     * Sets the active user of the application.
     * @param data The intent to get the user from.
     */
    private void onUserSettingsResult(Intent data) {
        User user = (User) data.getSerializableExtra(UserSettingsActivity.EXTRA_USER);
        boolean noExistingUser = (userManager.getActiveUser() == null);
        userManager.setActiveUser(user);
        if (noExistingUser) {
            setupFragments();
        }
    }

    /**
     * Starts the {@link UserSettingsActivity}
     */
    private void startUserSettingsActivity() {
        Intent userSettingsIntent = new Intent(this, UserSettingsActivity.class);
        userSettingsIntent.putExtra(UserSettingsActivity.EXTRA_USER, userManager.getActiveUser());
        startActivityForResult(userSettingsIntent, USER_SETTINGS_REQUEST);
    }
}