Unwanted animation of the NavDrawer when getting back to previous Activity

Question

I have a Navigation Drawer that launches activities when items are selected. Here's the problem: when I press back from an Activity, i get back to the previous Activity, but unfortunately i see an animation of the Navigation Drawer closing. This is an unwanted behaviour: i want to get back and see no animation at all!

Here's my code:

private DrawerLayout mDrawerLayout; //declared globally in my Activity

mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); //located in my OnCreate()

And this is how I close the NavDrawer when I get back to the previous Activity:

@Override
public void onResume(){
    mDrawerLayout.closeDrawer(Gravity.START);

    super.onResume();
}

Where is the mistake?

EDIT

Here's how i start activities from Navigation Drawer:

@Override
        public void onClick(View view, int position) {


            switch(position){

                case 0 : {
                            Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), PreparativiActivity.class);
                            NavigationDrawerFragment.this.startActivity(myIntent);
                            break;
                         }


                case 1 : {
                            Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), MainActivity.class);
                            NavigationDrawerFragment.this.startActivity(myIntent);
                            break;
                         }


                case 2 : {
                            Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), ModulisticaActivity.class);
                            NavigationDrawerFragment.this.startActivity(myIntent);
                            break;
                         }




                case 3 : {
                            Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), PoloActivity.class);
                            NavigationDrawerFragment.this.startActivity(myIntent);
                            break;
                         }


                case 4 : {
                          Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), ContattiActivity.class);
                          NavigationDrawerFragment.this.startActivity(myIntent);
                          break;
                         }


                case 5 : {
                          Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), IntroQuizActivity.class);
                          NavigationDrawerFragment.this.startActivity(myIntent);
                          break;
                         }


                case 6 : {
                           Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), CreditiActivity.class);
                           NavigationDrawerFragment.this.startActivity(myIntent);
                           break;
                          }


                default: { Toast.makeText(getActivity(), "Errore di sistema numero 001 ", Toast.LENGTH_SHORT).show();

                         }




            }

        }

Answer 1

You should not close the Drawer when resuming the Activity:

@Override
public void onResume(){
mDrawerLayout.closeDrawer(Gravity.START); //this should have been done before
super.onResume();
}

Instead you should close it when starting an Activity from the drawer:

@Override
public void onClick(View view, int position) {
        switch(position){

            case 0 : {
                        Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), PreparativiActivity.class);
                        mDrawerLayout.closeDrawer(Gravity.START);
                        NavigationDrawerFragment.this.startActivity(myIntent);
                        break;
                     }
//And so on...

Another possibility (to hide the close-Animation even more) would be to close the drawer after starting the new Activity:

@Override
    public void onClick(View view, int position) {


        switch(position){

            case 0 : {
                        Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), PreparativiActivity.class);
                        NavigationDrawerFragment.this.startActivity(myIntent);
                        break;
                     }


            case 1 : {
                        Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), MainActivity.class);
                        NavigationDrawerFragment.this.startActivity(myIntent);
                        break;
                     }


            case 2 : {
                        Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), ModulisticaActivity.class);
                        NavigationDrawerFragment.this.startActivity(myIntent);
                        break;
                     }




            case 3 : {
                        Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), PoloActivity.class);
                        NavigationDrawerFragment.this.startActivity(myIntent);
                        break;
                     }


            case 4 : {
                      Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), ContattiActivity.class);
                      NavigationDrawerFragment.this.startActivity(myIntent);
                      break;
                     }


            case 5 : {
                      Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), IntroQuizActivity.class);
                      NavigationDrawerFragment.this.startActivity(myIntent);
                      break;
                     }


            case 6 : {
                       Intent myIntent = new Intent(NavigationDrawerFragment.this.getActivity(), CreditiActivity.class);
                       NavigationDrawerFragment.this.startActivity(myIntent);
                       break;
                      }


            default: { Toast.makeText(getActivity(), "Errore di sistema numero 001 ", Toast.LENGTH_SHORT).show();

                     }
            } //switch end
            mDrawerLayout.closeDrawer(Gravity.START);
}//onClick end

Edit: One problem of this solution could be that the closing-animation seems a bit laggy. This is because the Android-system is already busy with rendering the new Activity, so there is not enough capacity for rendering the closing-animation anymore.

To solve this problem you could speed up the animation (so there would be less animation-rendering). Unfortunately, doing this seems to be a bit complicated.

To learn more about speeding up the animation, read here: Speed up 'Navigation Drawer' animation speed on closing?