Where shit happends

package edu.southern.cs.circ.devoted;

import android.app.Activity;
import android.app.FragmentManager;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.Menu;
import android.view.MenuInflater;

import java.util.Date;

import edu.southern.cs.circ.devoted.Resources.DevotedHelper;

public class HomeActivity extends Activity implements FragmentManager.OnBackStackChangedListener {

    SharedPreferences _prefs;
    DevotedHelper _devoted;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);

        _devoted = new DevotedHelper();

        if (savedInstanceState == null) {
            getFragmentManager().beginTransaction()
                    .add(R.id.fragment_container, new TodayFragment())
                    .commit();
        }

        // Handles the Back button
        getFragmentManager().addOnBackStackChangedListener(this);
        shouldDisplayHomeUp();
    }

    @Override
    public void onBackStackChanged() {
        shouldDisplayHomeUp();
    }

    public void shouldDisplayHomeUp(){
        //Enable Up button only  if there are entries in the back stack
        boolean canBack = getFragmentManager().getBackStackEntryCount()>0;
        getActionBar().setDisplayHomeAsUpEnabled(canBack);
    }

    @Override
    public boolean onNavigateUp() {
        //This method is called when the up button is pressed. Just the pop back stack.
        getFragmentManager().popBackStack();
        return true;
    }



    @Override
    public void onStart() {
        super.onStart();
        // Save todays date in the desired format and time zone
        _prefs = PreferenceManager.getDefaultSharedPreferences(this);
        SharedPreferences.Editor editor = _prefs.edit();


        Long dateMST = _devoted.getDateForTimeZoneAsLong(new Date(),"MST");

        editor.putLong(getResources().getString(R.string.current_date), dateMST);
        editor.commit();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu items for use in the action bar
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.main, menu);
        return super.onCreateOptionsMenu(menu);
    }

}