Ich habe diesen Code in meiner OnCreate-Funktion verwendet, um die Navigationsleiste zu öffnen, indem ich auf das App-Symbol geklickt habe.

ActionBarDrawerToggle mDrawerToggle = new ActionBarDrawerToggle(
                this,                  /* host Activity */
                (DrawerLayout) findViewById(R.id.left_drawer), /* DrawerLayout object */
                getResources().getDrawable(R.drawable.ic_drawer),  /* nav drawer icon to replace 'Up' caret */
                getString(R.string.drawer_open),  /* "open drawer" description */
                getString(R.string.drawer_close)  /* "close drawer" description */
                ) {

            /** Called when a drawer has settled in a completely closed state. */
            public void onDrawerClosed(View view) {
                getActionBar().setTitle(R.string.title_activity_add);
            }

            /** Called when a drawer has settled in a completely open state. */
            public void onDrawerOpened(View drawerView) {
                getActionBar().setTitle(R.string.drawer_title);
            }
        };

Jetzt heißt es "Der Konstruktor ActionBarDrawerToggle (AddActivity, DrawerLayout, Drawable, String, String) ist undefiniert". Ich habe android.support.v4.app.ActionBarDrawerToggle importiert. Wo ist das problem