Help with ActionBarActivity

public static final String TAG = MainActivity.class.getSimpleName();

// TODO Shortcut to the top
private ActionBarDrawerToggle mDrawerToggle;
private DrawerLayout mDrawerLayout;
private String mActivityTitle;
private ListView mDrawerList;
private ArrayAdapter<String> mAdapter;

public static final int TAKE_PHOTO_REQUEST = 0;
public static final int TAKE_VIDEO_REQUEST = 1;
public static final int PICK_PHOTO_REQUEST = 2;
public static final int PICK_VIDEO_REQUEST = 3;

public static final int MEDIA_TYPE_IMAGE = 4;
public static final int MEDIA_TYPE_VIDEO = 5;

public static final int FILE_SIZE_LIMIT = 1024 * 1024 * 10; // 10 MB

protected Uri mMediaUri;

protected DialogInterface.OnClickListener mDialogListener = new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        switch (which) {
        case 0: // Take picture
            Intent takePhotoIntent = new Intent(
                    MediaStore.ACTION_IMAGE_CAPTURE);
            mMediaUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
            if (mMediaUri == null) {
                // display an error
                Toast.makeText(MainActivity.this,
                        R.string.error_external_storage, Toast.LENGTH_LONG)
                        .show();
            } else {
                takePhotoIntent
                        .putExtra(MediaStore.EXTRA_OUTPUT, mMediaUri);
                startActivityForResult(takePhotoIntent, TAKE_PHOTO_REQUEST);
            }
            break;
        case 1: // Take video
            Intent videoIntent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
            mMediaUri = getOutputMediaFileUri(MEDIA_TYPE_VIDEO);
            if (mMediaUri == null) {
                // display an error
                Toast.makeText(MainActivity.this,
                        R.string.error_external_storage, Toast.LENGTH_LONG)
                        .show();
            } else {
                videoIntent.putExtra(MediaStore.EXTRA_OUTPUT, mMediaUri);
                videoIntent.putExtra(MediaStore.EXTRA_DURATION_LIMIT, 10);
                videoIntent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 0); // 0
                                                                            // =
                                                                            // lowest
                                                                            // res
                startActivityForResult(videoIntent, TAKE_VIDEO_REQUEST);
            }
            break;
        case 2: // Choose picture
            Intent choosePhotoIntent = new Intent(Intent.ACTION_GET_CONTENT);
            choosePhotoIntent.setType("image/*");
            startActivityForResult(choosePhotoIntent, PICK_PHOTO_REQUEST);
            break;
        case 3: // Choose video
            Intent chooseVideoIntent = new Intent(Intent.ACTION_GET_CONTENT);
            chooseVideoIntent.setType("video/*");
            Toast.makeText(MainActivity.this,
                    R.string.video_file_size_warning, Toast.LENGTH_LONG)
                    .show();
            startActivityForResult(chooseVideoIntent, PICK_VIDEO_REQUEST);
            break;
        }
    }

    private Uri getOutputMediaFileUri(int mediaType) {
        // To be safe, you should check that the SDCard is mounted
        // using Environment.getExternalStorageState() before doing this.
        if (isExternalStorageAvailable()) {
            // get the URI

            // 1. Get the external storage directory
            String appName = MainActivity.this.getString(R.string.app_name);
            File mediaStorageDir = new File(
                    Environment
                            .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
                    appName);

            // 2. Create our subdirectory
            if (!mediaStorageDir.exists()) {
                if (!mediaStorageDir.mkdirs()) {
                    Log.e(TAG, "Failed to create directory.");
                    return null;
                }
            }

            // 3. Create a file name
            // 4. Create the file
            File mediaFile;
            Date now = new Date();
            String timestamp = new SimpleDateFormat("yyyyMMdd_HHmmss",
                    Locale.US).format(now);

            String path = mediaStorageDir.getPath() + File.separator;
            if (mediaType == MEDIA_TYPE_IMAGE) {
                mediaFile = new File(path + "IMG_" + timestamp + ".jpg");
            } else if (mediaType == MEDIA_TYPE_VIDEO) {
                mediaFile = new File(path + "VID_" + timestamp + ".mp4");
            } else {
                return null;
            }

            Log.d(TAG, "File: " + Uri.fromFile(mediaFile));

            // 5. Return the file's URI
            return Uri.fromFile(mediaFile);
        } else {
            return null;
        }
    }

    private boolean isExternalStorageAvailable() {
        String state = Environment.getExternalStorageState();

        if (state.equals(Environment.MEDIA_MOUNTED)) {
            return true;
        } else {
            return false;
        }
    }
};

/**
 * The {@link android.support.v4.view.PagerAdapter} that will provide
 * fragments for each of the sections. We use a
 * {@link android.support.v4.app.FragmentPagerAdapter} derivative, which
 * will keep every loaded fragment in memory. If this becomes too memory
 * intensive, it may be best to switch to a
 * {@link android.support.v4.app.FragmentStatePagerAdapter}.
 */
SectionsPagerAdapter mSectionsPagerAdapter;

/**
 * The {@link ViewPager} that will host the section contents.
 */
ViewPager mViewPager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);


    // TODO Shortcut to onCreate()

    mDrawerList = (ListView) findViewById(R.id.left_drawer);
    mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    mActivityTitle = getTitle().toString();

    addDrawerItems();

    ParseAnalytics.trackAppOpened(getIntent());

    ParseUser currentUser = ParseUser.getCurrentUser();
    if (currentUser == null) {
        navigateToLogin();
    } else {
        Log.i(TAG, currentUser.getUsername());
    }

    // Set up the action bar.
    final ActionBar actionBar = getActionBar();
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    // Create the adapter that will return a fragment for each of the three
    // primary sections of the app.
    mSectionsPagerAdapter = new SectionsPagerAdapter(this,
            getSupportFragmentManager());

    // Set up the ViewPager with the sections adapter.
    mViewPager = (ViewPager) findViewById(R.id.pager);
    mViewPager.setAdapter(mSectionsPagerAdapter);

    // When swiping between different sections, select the corresponding
    // tab. We can also use ActionBar.Tab#select() to do this if we have
    // a reference to the Tab.
    mViewPager
            .setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
                @Override
                public void onPageSelected(int position) {
                    actionBar.setSelectedNavigationItem(position);
                }
            });

    // For each of the sections in the app, add a tab to the action bar.
    for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
        // Create a tab with text corresponding to the page title defined by
        // the adapter. Also specify this Activity object, which implements
        // the TabListener interface, as the callback (listener) for when
        // this tab is selected.
        actionBar.addTab(actionBar.newTab()
                .setIcon(mSectionsPagerAdapter.getIcon(i))
                .setTabListener(this));
    }

}

private void addDrawerItems() {
    String[] osArray = { "Home", "Inbox", "Credits", "GIFS/Stickers", "Settings" };
    mAdapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, osArray);
    mDrawerList.setAdapter(mAdapter);

    mDrawerList
            .setOnItemClickListener(new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View view,
                        int position, long id) {
                    Toast.makeText(MainActivity.this,
                            "Time for an upgrade!", Toast.LENGTH_SHORT)
                            .show();
                }
            });
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (resultCode == RESULT_OK) {
        if (requestCode == PICK_PHOTO_REQUEST
                || requestCode == PICK_VIDEO_REQUEST) {
            if (data == null) {
                Toast.makeText(this, getString(R.string.general_error),
                        Toast.LENGTH_LONG).show();
            } else {
                mMediaUri = data.getData();
            }

            Log.i(TAG, "Media URI: " + mMediaUri);
            if (requestCode == PICK_VIDEO_REQUEST) {
                // make sure the file is less than 10 MB
                int fileSize = 0;
                InputStream inputStream = null;

                try {
                    inputStream = getContentResolver().openInputStream(
                            mMediaUri);
                    fileSize = inputStream.available();
                } catch (FileNotFoundException e) {
                    Toast.makeText(this, R.string.error_opening_file,
                            Toast.LENGTH_LONG).show();
                    return;
                } catch (IOException e) {
                    Toast.makeText(this, R.string.error_opening_file,
                            Toast.LENGTH_LONG).show();
                    return;
                } finally {
                    try {
                        inputStream.close();
                    } catch (IOException e) { /* Intentionally blank */
                    }
                }

                if (fileSize >= FILE_SIZE_LIMIT) {
                    Toast.makeText(this,
                            R.string.error_file_size_too_large,
                            Toast.LENGTH_LONG).show();
                    return;
                }
            }
        } else {
            Intent mediaScanIntent = new Intent(
                    Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
            mediaScanIntent.setData(mMediaUri);
            sendBroadcast(mediaScanIntent);
        }

        Intent recipientsIntent = new Intent(this, RecipientsActivity.class);
        recipientsIntent.setData(mMediaUri);

        String fileType;
        if (requestCode == PICK_PHOTO_REQUEST
                || requestCode == TAKE_PHOTO_REQUEST) {
            fileType = ParseConstants.TYPE_IMAGE;
        } else {
            fileType = ParseConstants.TYPE_VIDEO;
        }

        recipientsIntent.putExtra(ParseConstants.KEY_FILE_TYPE, fileType);
        startActivity(recipientsIntent);
    } else if (resultCode != RESULT_CANCELED) {
        Toast.makeText(this, R.string.general_error, Toast.LENGTH_LONG)
                .show();
    }
}

private void navigateToLogin() {
    Intent intent = new Intent(this, LoginActivity.class);
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
    startActivity(intent);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int itemId = item.getItemId();

    switch (itemId) {
    case R.id.action_logout:
        ParseUser.logOut();
        navigateToLogin();
        break;
    case R.id.action_edit_friends:
        Intent intent = new Intent(this, EditFriendsActivity.class);
        startActivity(intent);
        break;
    case R.id.action_camera:
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setItems(R.array.camera_choices, mDialogListener);
        AlertDialog dialog = builder.create();
        dialog.show();
        break;
    case R.id.action_sms:
        Intent smsIntent = new Intent(this, SendSMSActivity.class);
        startActivity(smsIntent);
        break;
    case R.id.action_message:
        Intent messageIntent = new Intent(this, SendTextActivity.class);
        startActivity(messageIntent);
        break;

    }

    return super.onOptionsItemSelected(item);
}

@Override
public void onTabSelected(ActionBar.Tab tab,
        FragmentTransaction fragmentTransaction) {
    // When the given tab is selected, switch to the corresponding page in
    // the ViewPager.
    mViewPager.setCurrentItem(tab.getPosition());
}

@Override
public void onTabUnselected(ActionBar.Tab tab,
        FragmentTransaction fragmentTransaction) {
}

@Override
public void onTabReselected(ActionBar.Tab tab,
        FragmentTransaction fragmentTransaction) {
}