MainActivity.java

package net.i2p.android.router.activity;

import net.i2p.android.router.R;
import net.i2p.android.router.fragment.I2PFragmentBase;
import net.i2p.android.router.fragment.MainFragment;
import net.i2p.android.router.util.Util;
import android.content.res.Configuration;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class MainActivity extends ActionBarActivity {
    private DrawerLayout mDrawerLayout;
    private ListView mDrawerList;
    private ActionBarDrawerToggle mDrawerToggle;

    private CharSequence mDrawerTitle;
    private CharSequence mTitle;
    private String[] mFragments;
    private String[] mFragmentTitles;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mTitle = mDrawerTitle = getTitle();
        mFragments = getResources().getStringArray(R.array.main_fragments);
        mFragmentTitles = getResources().getStringArray(R.array.main_fragment_titles);
        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerList = (ListView) findViewById(R.id.drawer);

        // Set a custom shadow that overlays the main content when the drawer opens
        mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
        mDrawerList.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
        // Set the adapter for the list view
        mDrawerList.setAdapter(new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, mFragmentTitles));
        // Set the list's click listener
        mDrawerList.setOnItemClickListener(new DrawerItemClickListener());

        // Enable ActionBar app icon to behave as action to toggle nav drawer
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setHomeButtonEnabled(true);

        mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
                R.drawable.ic_drawer, R.string.drawer_open, R.string.drawer_close) {

            /** Called when a drawer has settled in a completely closed state. */
            public void onDrawerClosed(View view) {
                getSupportActionBar().setTitle(mTitle);
                supportInvalidateOptionsMenu();
            }

            /** Called when a drawer has settled in a completely open state. */
            public void onDrawerOpened(View view) {
                getSupportActionBar().setTitle(mDrawerTitle);
                supportInvalidateOptionsMenu();
            }
        };

        // Set the drawer toggle as the DrawerListener
        mDrawerLayout.setDrawerListener(mDrawerToggle);

        // Start with the home view
        if (savedInstanceState == null) {
            MainFragment mainFragment = new MainFragment();
            mainFragment.setArguments(getIntent().getExtras());
            getSupportFragmentManager().beginTransaction()
                    .add(R.id.main_content, mainFragment).commit();
        }
    }

    /* Called whenever we call invalidateOptionsMenu() */
    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        // If the nav drawer is open, hide action items related to the content view
        boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
        //menu.findItem(R.id.action_add_to_addressbook).setVisible(!drawerOpen);
        return super.onPrepareOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // The action bar home/up action should open or close the drawer.
        // ActionBarDrawerToggle will take care of this.
        if(mDrawerToggle.onOptionsItemSelected(item)) {
            return true;
        }
        // Handle action buttons
        return super.onOptionsItemSelected(item);
    }

    private class DrawerItemClickListener implements ListView.OnItemClickListener {
        public void onItemClick(AdapterView<?> parent, View view, int pos, long id) {
            selectItem(pos);
        }
    }

    private void selectItem(int pos) {
        Fragment fragment = Fragment.instantiate(MainActivity.this, mFragments[pos]);

        // Insert the fragment by replacing any existing fragment
        FragmentManager fragmentManager = getSupportFragmentManager();
        fragmentManager.beginTransaction()
                       .replace(R.id.main_content, fragment)
                       .commit();

        // Highlight the selected item, update the title, and close the drawer
        mDrawerList.setItemChecked(pos, true);
        setTitle(mFragmentTitles[pos]);
        mDrawerLayout.closeDrawer(mDrawerList);
    }

    @Override
    public void setTitle(CharSequence title) {
        mTitle = title;
        getSupportActionBar().setTitle(mTitle);
    }

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        Util.i("Initializing...");
        InitActivities init = new InitActivities(this);
        init.debugStuff();
        init.initialize();
        super.onPostCreate(savedInstanceState);
        // Sync the toggle state after onRestoreInstanceState has occurred.
        mDrawerToggle.syncState();
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        // Pass any configuration change to the drawer toggle
        mDrawerToggle.onConfigurationChanged(newConfig);
    }

    @Override
    public void onBackPressed() {
        Fragment fragment = getSupportFragmentManager().findFragmentById(R.id.main_content);
        if (fragment instanceof I2PFragmentBase) {
            I2PFragmentBase ifb = (I2PFragmentBase) fragment;
            // If we shouldn't stay on this fragment, go back.
            if (ifb.onBackPressed())
                return;
        }
        super.onBackPressed();
    }
}