MainActivity.java

package com.android.smap.activities;

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.widget.DrawerLayout;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;

import com.android.smap.R;
import com.android.smap.adapters.MenuDrawerAdapter;
import com.android.smap.fragments.BaseFragment;
import com.android.smap.fragments.ContactsFragment;
import com.android.smap.fragments.SettingsFragment;
import com.android.smap.fragments.SurveysFragment;
import com.android.smap.sms.GatewayService;
import com.android.smap.ui.ViewQuery;

public class MainActivity extends BaseActivity implements OnItemClickListener {

    private ViewQuery mQuery;
    private ViewQuery mMenuQuery;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setupActionBar();
        setInitialFragment(SurveysFragment.class);
        setContentView(R.layout.activity_main);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        mQuery = new ViewQuery(this);
        mMenuQuery = mQuery.find(R.id.drawer_left);
        mMenuQuery.adapter(new MenuDrawerAdapter(this)).onItemClicked(this);

    }

    @Override
    public void setupActionBar() {
        super.setupActionBar();
        getActionBar().setDisplayShowCustomEnabled(true);
        getActionBar().setDisplayHomeAsUpEnabled(false);
        getActionBar().setHomeButtonEnabled(true);
    }

    private void setInitialFragment(Class<? extends BaseFragment> fclass) {
        Fragment f = Fragment.instantiate(this, fclass.getName());
        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        ft.replace(R.id.container, f);
        ft.commit();
    }

    @Override
    protected void onResume() {
        super.onResume();
        startService(new Intent(this, GatewayService.class));
    }


    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == android.R.id.home) {

            toggleDraw();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    private void toggleDraw() {

        DrawerLayout drawer = mQuery.find(R.id.layout_drawer).get(
                DrawerLayout.class);
        View menuView = mMenuQuery.get();
        if (drawer.isDrawerOpen(menuView)) {
            drawer.closeDrawer(menuView);
        } else {
            drawer.openDrawer(menuView);
        }

    }

    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int position,
                            long arg3) {

        toggleDraw();
        switch (position) {
            case 0:
                setInitialFragment(SurveysFragment.class);
                return;
            case 1:
                setInitialFragment(ContactsFragment.class);
                return;
            case 2:

                return;
            case 3:
                setInitialFragment(SettingsFragment.class);
                return;
            case 4:

                return;
            case 5:

                return;
            default:
                return;
        }

    }

}