CODEWITHSUNDEEP
androidmaterial-designandroid-support-library
heloisasim
heloisasim

Reputation: 5016

Navigation drawer: How to know the current selected item?

There is a left drawer and a fragment that changes when an item in the navigation drawer is selected. The problem is that, if the "Item A" is already selected, and the user select it again, the fragment is changed for the same fragment.

To prevent this behavior, I need to know which item is already selected. I was using a attribute mLastSelectedItemPosition, but i don't think this is a good solution. Is there any way to get the current checked item from the navigation drawer?

class OnNavigationItemSelectedListener implements NavigationView.OnNavigationItemSelectedListener {
        @Override
        public boolean onNavigationItemSelected(MenuItem menuItem) {
            if (mLastSelectedItemPosition != menuItem.getOrder()) {
                // Is not the same item, so I can change the fragment.
                mLastSelectedItemPosition = menuItem.getOrder();
            }
            mDrawerLayout.closeDrawers();
            return true;
        }
    }
}

Upvotes: 3

Views: 3161

Answers (2)

Leonardo
Leonardo

Reputation: 3191

I do the exact same thing, have a int variable holding the selected position. One thing to keep in mind is to save this variable onInstaceChange, because if you don`t you might be out-of-date with your drawer. So, with that said, some code:

    private static final String MENU_ITEM = "menu_item";
    private int menuItemId;
    ...
    navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
                @Override
                public boolean onNavigationItemSelected(MenuItem item) {

                    if (menuItemId == item.getItemId()) {
                        drawerLayout.closeDrawer(navigationView);
                        return false;

                    switch (item.getItemId()) {
....
                    }

                    ...
                    drawerLayout.closeDrawer(navigationView);
                    item.setChecked(true);
                    menuItemId = item.getItemId();
                    return true;
                }
            });
     @Override
        protected void onSaveInstanceState(@NonNull Bundle outState) {
            super.onSaveInstanceState(outState);
            outState.putInt(MENU_ITEM, menuItemId);
        }

        @Override
        protected void onRestoreInstanceState(@NonNull Bundle savedInstanceState) {
            super.onRestoreInstanceState(savedInstanceState);
            this.menuItemId = savedInstanceState.getInt(MENU_ITEM);
        }

Something like that !

Upvotes: 7

sapan ravani
sapan ravani

Reputation: 88

I think this will help you.

    private class SlideMenuClickListener implements
                ListView.OnItemClickListener {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position,
                    long id) {
                // display view for selected nav drawer item
                displayView(position);
Toast.makeText(getApplicationContext(),"You have selected " +position,Toast.LENGTH_LONG).show();
            }
        }

Upvotes: 0

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