What do you need to pass to v4.widget.DrawerLayout.isDrawerOpen()/.openDrawer()/.closeDrawer()

Question

I\'ve been trying to move my code across to the DrawerLayout as suggested by android here as SlidingDrawer is deprecated.

My problem is tha

Answer 1

And, the answer:

The second child (aka, the "Drawer") is what needs to be passed to the methods. My problem was that by the time I had figured that out I'd reduced the layout to as simple as possible implementation to test - I'd removed the gravity from the "drawer". Without a gravity, you get the above completely unrelated error messages.

I can confirm I got the code to work using the following setup:

mMenuPanel.isDrawerOpen(findViewById(R.id.drawer));

and with the layout:

<android.support.v4.widget.DrawerLayout
    android:id="@+id/mainmenuPanel"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <FrameLayout
        android:id="@+id/content"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <FrameLayout
        android:id="@+id/drawer"
        android:layout_width="300dp"
        android:layout_height="match_parent" 
        android:layout_gravity="start"/> <!-- This line was the problem!!!!!!!-->
</android.support.v4.widget.DrawerLayout>

Answer 2

if you want to avoid references to views or layouts in order to call isDrawerOpen, another way can be applied.

In this case you have to indicate the Gravity:

mDrawerLayout.isDrawerOpen(Gravity.START);

Being mDrawerLayout a reference to your DrawerLayout.

as you said, don't forget android:layout_gravity="start"

Answer 3

If you are using the drawer layout from the support library as we can see from your question that you are, there is also the method:

closeDrawers()

This will close all open drawers (which is usually just the one).

Answer 4

In your Activity if you have a reference to the DrawerLayout and in this case the FrameLayout with the id R.id.menuPane you can also do...

DrawerLayout mMenuPanel = (DrawerLayout) findViewById(R.id.mainmenuPanel);
FrameLayout mMenuPane = (FrameLayout) findViewById(R.id.menuPane);
mMenuPanel.isDrawerOpen(mMenuPane);

Basically you have to pass in a reference to the view being used as the drawer within the DrawerLayout, which will always be mMenuPanel.getChildAt(1) anyways.