MainActivity.java

package com.ucb.dcm;

import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
import android.widget.ImageView;
import android.widget.TabHost;
import android.widget.TextView;
import android.widget.Toast;
import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.app.SherlockFragmentActivity;
import com.actionbarsherlock.view.Menu;
import com.actionbarsherlock.view.MenuInflater;
import com.actionbarsherlock.view.MenuItem;
import com.actionbarsherlock.widget.SearchView;
import com.ucb.dcm.data.DBHelper;
import com.ucb.dcm.data.DataService;

import java.util.HashMap;

public class MainActivity extends SherlockFragmentActivity {
    TabHost mTabHost;
    TabManager mTabManager;

    private static final String SHOWS_TAB = "Shows";

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        //Set up services
        DataService.Initialize(this);
        DBHelper.Initialize(this);

        if(DataService.getSharedService().shouldUpdate()){
            DataService.getSharedService().updateFromServer(null);
        }
        setTheme(R.style.AppTheme);
        super.onCreate(savedInstanceState);

        //getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        setTitle("Del Close Marathon 15");

        setContentView(R.layout.activity_main);
        mTabHost = (TabHost)findViewById(android.R.id.tabhost);
        mTabHost.setup();

        mTabManager = new TabManager(this, mTabHost, R.id.realtabcontent);

        TabHost.TabSpec nowSpec =  mTabHost.newTabSpec("Now");
        nowSpec.setIndicator("Now", getResources().getDrawable(R.drawable.ic_action_now));
        mTabManager.addTab(nowSpec, NowActivity.class, null);

        TabHost.TabSpec showsSpec = mTabHost.newTabSpec(SHOWS_TAB);
        showsSpec.setIndicator("Shows", getResources().getDrawable(R.drawable.ic_action_shows));
        mTabManager.addTab(showsSpec, ShowsFragment.class, null);

        TabHost.TabSpec venueSpec = mTabHost.newTabSpec("Venues");
        venueSpec.setIndicator("Venues", getResources().getDrawable(R.drawable.ic_action_venues));
        mTabManager.addTab(venueSpec, VenuesFragment.class, null);

        TabHost.TabSpec favSpec = mTabHost.newTabSpec("Favs").setIndicator("Favs");
        favSpec.setIndicator("Favs", getResources().getDrawable(R.drawable.ic_action_favorite));

        mTabManager.addTab(favSpec, FavoritesFragment.class, null);


        if (savedInstanceState != null) {
            mTabHost.setCurrentTabByTag(savedInstanceState.getString("tab"));
        }
    }

//    private View createTabView(String title, int drawableId){
//        View retVal = getLayoutInflater().inflate(R.layout.tab_indicator, mTabHost.getTabWidget(), false);
//        TextView label = (TextView) retVal.findViewById(R.id.tab_label);
//        label.setText(title);
//        ImageView icon = (ImageView) retVal.findViewById(R.id.tab_icon);
//        icon.setImageDrawable(getResources().getDrawable(drawableId));
//        return retVal;
//    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putString("tab", mTabHost.getCurrentTabTag());
    }



    /**`
     * This is a helper class that implements a generic mechanism for
     * associating fragments with the tabs in a tab host.  It relies on a
     * trick.  Normally a tab host has a simple API for supplying a View or
     * Intent that each tab will show.  This is not sufficient for switching
     * between fragments.  So instead we make the content part of the tab host
     * 0dp high (it is not shown) and the TabManager supplies its own dummy
     * view to show as the tab content.  It listens to changes in tabs, and takes
     * care of switch to the correct fragment shown in a separate content area
     * whenever the selected tab changes.
     */
    public static class TabManager implements TabHost.OnTabChangeListener {
        private final FragmentActivity mActivity;
        private final TabHost mTabHost;
        private final int mContainerId;
        private final HashMap<String, TabInfo> mTabs = new HashMap<String, TabInfo>();
        TabInfo mLastTab;

        static final class TabInfo {
            private final String tag;
            private final Class<?> clss;
            private final Bundle args;
            private Fragment fragment;

            TabInfo(String _tag, Class<?> _class, Bundle _args) {
                tag = _tag;
                clss = _class;
                args = _args;
            }
        }

        static class DummyTabFactory implements TabHost.TabContentFactory {
            private final Context mContext;

            public DummyTabFactory(Context context) {
                mContext = context;
            }

            @Override
            public View createTabContent(String tag) {
                View v = new View(mContext);
                v.setMinimumWidth(0);
                v.setMinimumHeight(0);
                return v;
            }
        }

        public TabManager(FragmentActivity activity, TabHost tabHost, int containerId) {
            mActivity = activity;
            mTabHost = tabHost;
            mContainerId = containerId;
            mTabHost.setOnTabChangedListener(this);
        }

        public void addTab(TabHost.TabSpec tabSpec, Class<?> clss, Bundle args) {
            tabSpec.setContent(new DummyTabFactory(mActivity));
            String tag = tabSpec.getTag();

            TabInfo info = new TabInfo(tag, clss, args);

            // Check to see if we already have a fragment for this tab, probably
            // from a previously saved state.  If so, deactivate it, because our
            // initial state is that a tab isn't shown.
            info.fragment = mActivity.getSupportFragmentManager().findFragmentByTag(tag);
            if (info.fragment != null && !info.fragment.isDetached()) {
                FragmentTransaction ft = mActivity.getSupportFragmentManager().beginTransaction();
                ft.detach(info.fragment);
                ft.commit();
            }

            mTabs.put(tag, info);
            mTabHost.addTab(tabSpec);
        }

        @Override
        public void onTabChanged(String tabId) {
            TabInfo newTab = mTabs.get(tabId);
            if (mLastTab != newTab) {
                FragmentTransaction ft = mActivity.getSupportFragmentManager().beginTransaction();
                if (mLastTab != null) {
                    if (mLastTab.fragment != null) {
                        ft.detach(mLastTab.fragment);
                    }
                }
                if (newTab != null) {
                    if (newTab.fragment == null) {
                        newTab.fragment = Fragment.instantiate(mActivity, newTab.clss.getName(), newTab.args);
                        ft.add(mContainerId, newTab.fragment, newTab.tag);
                    } else {
                        ft.attach(newTab.fragment);
                    }
                }

                mLastTab = newTab;
                ft.commit();
                mActivity.getSupportFragmentManager().executePendingTransactions();
            }

            //Do this so we can show the search button or not.
            mActivity.supportInvalidateOptionsMenu();

        }
    }

    public void onScheduleDownloaded(){
        mTabManager.mLastTab.fragment.onResume();
    }

    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        menu.clear();
        getSupportMenuInflater().inflate(R.menu.main, menu);
        if(mTabHost.getCurrentTabTag().equals(SHOWS_TAB)){
            menu.findItem(R.id.menu_search).setVisible(true);
        }
        else {
            menu.findItem(R.id.menu_search).setVisible(false);
        }

        return true;
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getSupportMenuInflater();
        inflater.inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch(item.getItemId()){
            case R.id.menu_search:
                SearchView sv = (SearchView) item.getActionView();
                sv.setQueryHint("Title or Performer");
                sv.setOnQueryTextListener(new SearchListener(sv));
                break;
            case R.id.about:
                Intent aboutIntent = new Intent(this, AboutActivity.class);
                startActivity(aboutIntent);
                break;
            case R.id.refresh:
                AlertDialog.Builder builder = new AlertDialog.Builder(this);
                builder.setTitle("Refresh the schedule?");
                builder.setMessage("This will fetch the latest schedule from the server.  You will not lose your favorites.");
                builder.setNegativeButton("Cancel", null);
                builder.setPositiveButton("OK!", new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        DataService.getSharedService().refreshData();
                    }
                });
                builder.create().show();
                break;
        }

        return super.onOptionsItemSelected(item);
    }

    private class SearchListener implements SearchView.OnQueryTextListener {

        SearchView view;

        public SearchListener(SearchView sv){
            this.view = sv;
        }

        @Override
        public boolean onQueryTextSubmit(String s) {
            if(mTabHost.getCurrentTabTag().equals(SHOWS_TAB)){
                ShowsFragment frag = (ShowsFragment) mTabManager.mLastTab.fragment;
                frag.setFilter(s);
            }

            view.clearFocus();

            return true;
        }

        @Override
        public boolean onQueryTextChange(String s) {
            if(mTabHost.getCurrentTabTag().equals(SHOWS_TAB)){
                ShowsFragment frag = (ShowsFragment) mTabManager.mLastTab.fragment;
                frag.setFilter(s);
            }
            return true;
        }
    }



}