MainActivity or MainFragment?

[Jassim Rahma]

Hi, I have just created a default Android Studio project with navigation drawer. The project was created with:

MainActivity.java
NavigationDrawerFragment.java

and

activity_main.xml
fragment_main.xml
fragment_navigation_drawer.xml

does this mean my startup will be an activity not fragment? Do I need to change it? I am trying to set the item actions in the navigation drawer like this:

private void selectItem(int position) {
    mCurrentSelectedPosition = position;
    Fragment fragment = null;

    switch (position) {
        case 0:
            fragment = new WeatherFragment();
            break;
        case 1:
            fragment = new WeatherFragment();
            break;
        case 2:
            fragment = new WeatherFragment();
            break;

        default:
            break;
    }

    if (mDrawerListView != null) {
        mDrawerListView.setItemChecked(position, true);
    }

    if (mDrawerLayout != null) {
        // android.support.v4.app.FragmentManager fragmentManager = getFragmentManager();
        // fragmentManager.beginTransaction().replace(R.id.fragment\_main, fragment).commit();

        // mDrawerList.setItemChecked(position, true);
        // mDrawerList.setSelection(position);
        // getActionBar().setTitle(mNavigationDrawerItemTitles\[position\]);
        // mDrawerLayout.closeDrawer(mDrawerList);
        mDrawerLayout.closeDrawer(mFragmentContainerView);
    }
    if (mCallbacks != null) {
        mCallbacks.onNavigationDrawerItemSelected(position);
    }
}

so what this line should be:

fragmentManager.beginTransaction().replace(R.id.fragment_main, fragment).commit();

replace an activity or fragment. Thanks, Jassim

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