CynthiaDDurazo CynthiaDDurazo - 1 year ago 110
Android Question

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

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

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(;

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

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?


Answer Source

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:


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

public void openDrawer(){

In the activity onCreate run your findViewById:

mDrawerLayout = (DrawerLayout) getView().findViewById(;

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

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.

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