Navigation drawer for android app

Question

我在https://developer.android.com/training/implementing-navigation/nav-drawer.html上找到了一个导航抽屉示例，但问题是，在抽屉之间切换时会显示图像，我想在类之间进行切换有帮助吗？

Answer 1

The example isn't simply switching images. If you look closer you will see that it's creating a new Fragment for ever item selected. That is the component that you would most likely use when you say "switch between classes".

private void selectItem(int position) {
    // Create a new fragment and specify the planet to show based on position
    Fragment fragment = new PlanetFragment();
    Bundle args = new Bundle();
    args.putInt(PlanetFragment.ARG_PLANET_NUMBER, position);
    fragment.setArguments(args);

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

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