Not to reload the fragment once loaded-ANDROID

In my Android app I have 6 fragments which are replaced one by one on clicking item in navigation drawer. My problem is that fragment are loaded again and again when clicking on navigation drawer items. I don not want my fragment to reload again and again. Instead I want them to remain in their previous state when switching from fragment to fragment. Addbacktostack() is not working.please tell me some other way to do it:

My code is:

 @Override
public void onDrawerItemSelected(View view, int position) {
    row_view = view;
    displayView(position);

}

private void displayView(int position) {
    Fragment fragment = null;
    String title = getString(R.string.app_name);
    switch (position) {
        case 0:
            fragment = new Fragmenta();
            title = "aaaa";
            toolbar_title.setText(title);
            break;
        case 1:
            fragment = new Fragmentb();
            title = "Introduction";
            toolbar_title.setText(title);
            break;
        case 2:
            fragment = new Glossary();
            title = "Glossary";
            toolbar_title.setText(title);
            break;
        case 3:
            fragment = new SettingsFragment();
            title = "Settings";
            toolbar_title.setText(title);
            break;
        case 4:
            fragment = new FeedbackFragment();
            title = "Feedback";
            toolbar_title.setText(title);
            break;
        case 5:
            fragment = new Fragmentc();
            title = "cc";
            toolbar_title.setText(title);
            break;

        default:
            break;
    }



if (myfragmentstate != null) {             // This is always null
        //Restore the fragment's instance
        fragment = getSupportFragmentManager().getFragment(myfragmentstate, "mContent");
        Log.i("sadfas","fragment"+fragment);

    }
    if (fragment != null) {
        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager
                .beginTransaction();
        fragmentTransaction.replace(R.id.container_body,fragment);   //always reloads a fragment and i donot want this
        fragmentTransaction.commit();
        toolbar_title.setText(title);

    }
}



@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    Log.i("MicroRAE","instanmce save"+fragment);
    getSupportFragmentManager().putFragment(outState, "mContent", fragment);
}

Copyright Notice：Content Author:「shivani gupta」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/37915563/not-to-reload-the-fragment-once-loaded-android