How to open Navigation Drawer with no actionbar, open with just a button

Question

I have a navigation bar without any actionbar (I don't want an actionbar). I'm trying to make it so that I have a button that can open the navigation drawer.

I know there's a method called openDrawer for the DrawerLayout http://developer.android.com/reference/android/support/v4/widget/DrawerLayout.html#openDrawer(android.view.View)

I didn't know how to use it, but i have tried making a button when click, runs this method:

DrawerLayout mDrawerLayout = (DrawerLayout) getView().findViewById(R.id.drawer_layout);
mDrawerLayout.openDrawer(mDrawerLayout);

When i click it on it, it gives me a Java NullPointerException. Anybody has any idea?

EDIT: This code is inside a fragment, and I'm trying to refer those drawer layout outside the fragment. I used debugger, and it is showing that mDrawlerLayout is NULL.

Any advice?

Thanks!

score 56 · Accepted Answer · edited Sep 26 '13 at 10:17

It's giving you a null pointer because you are trying to find the drawer layout in the fragment's view, when it is actually in the activities view.

A quick hack to do what you want is to find the view like:

getActivity().findViewById(R.id.drawer_layout)

That should work. A better way is to have a method on the activity for opening the drawer

public void openDrawer(){
    mDrawerLayout.openDrawer(mDrawerLayout);
}

In the activity onCreate run your findViewById:

mDrawerLayout = (DrawerLayout) getView().findViewById(R.id.drawer_layout);

mDrawerLayout should be a member variable of your activity.

Then in your fragment you can call:

//cast activity to MyActivity so compiler doesn't complain
((MyActivity)getActivity()).openDrawer();

An even better way to do it is to create a listener in the fragment and set the activity as a listener to the fragment. Then you can call a method on the activity, similar to above. I'll let you do some research on how to do that.

I had to use `mDrawerLayout.openDrawer(Gravity.LEFT);` in `openDrawer` method to make it work. (I am using navigation drawer without both fragments & action bar) Otherwise, it just hangs the app. — Ashish Tanna, Oct 13 '14 at 20:06
Is it possible to remove the default icon? In that position I want to use a different option menu. — JCarlosR, Nov 11 '16 at 01:03

score 40 · Answer 2 · edited Aug 09 '19 at 14:44

40

drawerLayout.openDrawer(Gravity.START);

edited Aug 09 '19 at 14:44

Roshana Pitigala

8,437
8
49
80

answered Dec 18 '14 at 19:43

Aliya

1,168
12
17

score 4 · Answer 3 · answered Nov 06 '16 at 11:46

4

It works on Button click

mButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            drawer.openDrawer(GravityCompat.START);

        }
    });

answered Nov 06 '16 at 11:46

Maksudul Hasan Raju

865
9
6

score 2 · Answer 4 · answered Jan 25 '17 at 11:17

Thanks to @athor & @Ashish Tana.

It took me so much time to figure out the error (NullPointerException) I am getting.

Mine works this way; Instead of getView(), I use getActivity() and open the drawer by mDrawerLayout.openDrawer(Gravity.LEFT);.

mDrawerLayout = (DrawerLayout) getActivity().findViewById(R.id.drawer_layout);
final ImageButton btnOpenDrawer = (ImageButton) getView().findViewById(R.id.drawer_menu);

        btnOpenDrawer.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mDrawerLayout.openDrawer(Gravity.LEFT);
            }
        });

this really work I place this onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); //place the code here } — Faisal, Jun 07 '17 at 12:28

Sapnesh Naik · Answer 5 · 2019-01-25T04:31:32.970

2

I have a simpler solution which uses isDrawerOpen() of DrawerLayout.

The code below closes or opens the navigation drawer based on the drawer's current state (Opened/Closed)

Button hamMenu = findViewById(R.id.ham_menu);
hamMenu.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        DrawerLayout navDrawer = findViewById(R.id.drawer_layout);
        // If navigation drawer is not open yet, open it else close it.
        if(!navDrawer.isDrawerOpen(GravityCompat.START)) navDrawer.openDrawer(Gravity.START);
        else navDrawer.closeDrawer(Gravity.END);
    }
});

edited Jan 25 '19 at 04:31

answered Nov 10 '18 at 15:03

Sapnesh Naik

11,011
7
63
98

For close the drawer I had to use `navDrawer.closeDrawer(Gravity.START);` to make it work. Otherwise, I just get an _IllegalArgumentException_ because "No drawer view found with gravity RIGHT". – Denis Francia Karell Dec 28 '22 at 02:40

score 0 · Answer 6 · edited May 23 '17 at 12:18

I wrote an answer about this here: https://stackoverflow.com/a/18199771/880349

   //For me a better way in avoiding a `null pointer` in getting the DrawerLayout
   final DrawerLayout drawer = (DrawerLayout) getActivity().findViewById(R.id.drawer_layout);
   btn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                            //Opens the Drawer
                drawer.openDrawer(Your View, Usually a ListView);
            }

                return false;
        });

You directly get the current drawer inside a view/fragement so that you won't get a NullPointerException

score 0 · Answer 7 · answered Jan 27 '20 at 15:46

Kotlin Solution
If you want to open it from a fragment, you can use:

activity?.drawerLayout?.openDrawer(GravityCompat.START)

or inside the activity directly:

drawerLayout.openDrawer(GravityCompat.START)

Note:
If you are not familiar with the '?', I highly recommend reading about null saftey from kotlin's documentation (It is very short don't worry): https://kotlinlang.org/docs/reference/null-safety.html

How to open Navigation Drawer with no actionbar, open with just a button

7 Answers7

Linked

Related