com.raypold.raypoldcounter.MainActivity.java Source code

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Here is the source code for com.raypold.raypoldcounter.MainActivity.java

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/*
 * Author Michael Raypold
 * 
 * A copy of the license is available in LICENSE or at http://www.gnu.org/licenses/gpl-2.0.html
 * 
 * MainActivity initializes the application layout.
 *  - This includes setting up the action bar and tabs
 *  - Determine if this is the first time the application has run
 *  - Creating a counter if none exist on disk.
 * 
 * Tutorials used for code on this page include:
 * http://www.androidhive.info/2013/10/android-tab-layout-with-swipeable-views-1/
 * https://www.youtube.com/watch?v=VVahIc8yENk
 * https://www.youtube.com/watch?v=iEl0ylVvZho
 */

package com.raypold.raypoldcounter;

import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.ActionBar.TabListener;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.Toast;

public class MainActivity extends FragmentActivity implements TabListener {

    /*
     * NUMBEROFTABS must be the same as the size of the tabNames list!
     */
    public final static int NUMBEROFTABS = 3;
    public String[] tabNames = {}; // setTabNames() pull data from strings.xml;

    public ActionBar actionBar;
    public static ViewPager viewPager;
    public static SharedPreferences preferences, savedCounters;
    private static FragmentManager fragment;
    public static Context context; // Going to need to access this directly for
    // the serialize class

    @Override
    protected void onCreate(Bundle arg0) {

        super.onCreate(arg0);
        setContentView(R.layout.activity_main);

        context = getApplicationContext();
        setFragmentManager();
        detectFirstRun();

        /*
         * Open the sharedPreference files for the actionBar functions extended
         * in ActionBarHandler
         */
        preferences = getSharedPreferences("userPreferences", 0);
        savedCounters = getSharedPreferences("savedCounters", 0);

        /* Create the action bar */
        final ActionBar actionBar = getActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        viewPager = (ViewPager) findViewById(R.id.pager);
        viewPager.setAdapter(new FragmentAdapter(getSupportFragmentManager()));

        setTabNames();

        /* Create the navigation tabs and add them to the action bar */
        for (String tabName : tabNames) {
            actionBar.addTab(actionBar.newTab().setText(tabName).setTabListener(this));
        }

        /* Synchronize the the swiping and the highlighted tab view */
        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {

            @Override
            public void onPageScrollStateChanged(int arg0) {
            }

            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
            }

            @Override
            public void onPageSelected(int arg0) {
                actionBar.setSelectedNavigationItem(arg0);
            }
        });
    }

    /* Start: Define what happens when a tab is selected */
    @Override
    public void onTabReselected(Tab tab, FragmentTransaction ft) {
    }

    @Override
    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        /* When user clicks a tab move to that view */
        viewPager.setCurrentItem(tab.getPosition());
    }

    @Override
    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
    }

    /* End: Define what happens when a tab is selected */

    /* onCreateOptionsMenu creates the menu above the tabs */
    /* see res/menu/activity_main_actions.xml for layout */
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.main_activity_actions, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        ActionBarHandler handler = new ActionBarHandler(item, getApplicationContext());
        return handler.getAction();
    }

    /* Determine if this is the first time the application has run */
    private void detectFirstRun() {

        Preferences preferences = new Preferences(getBaseContext());
        Boolean firstRun = preferences.isFirstRun();

        if (firstRun == true) {
            createFirstCounter();
            preferences.setFirstRun();

        }

    }

    /* Create a default counter for the user on the first run */
    public void createFirstCounter() {
        String defaultCounterName = getString(R.string.defaultCounterName);

        CountersMap counters = new CountersMap();
        Counter counter = new Counter(defaultCounterName);
        counters.insertCounterObject(counter);

        Preferences preferences = new Preferences(getBaseContext());
        preferences.setLastOpenCounter(defaultCounterName);

        /*
         * Serialize the counter and the counter map to prepare for
         * CounterFragment
         */
        Serialize serialize = new Serialize();
        serialize.serializeCountersMap(counters);
        serialize.serializeCounter(counter);

        Toast.makeText(getBaseContext(), getString(R.string.defaultCounterMessage), Toast.LENGTH_LONG).show();

    }

    /* Remember to change NUMBEROFTABS if adding/removing tabs here */
    private void setTabNames() {
        tabNames = new String[] { getResources().getString(R.string.counter),
                getResources().getString(R.string.saved_counters), getResources().getString(R.string.summary) };
    }

    /*
     * Unfortunately, I couldn't get certain functions in ActionBarHandler to
     * work without the following getters and setters.
     * 
     * Ideally, I think there is an alternative, more elegant way to code this.
     */
    public void setFragmentManager() {
        MainActivity.fragment = getFragmentManager();
    }

    public static FragmentManager getFragment() {
        return fragment;
    }

}