Set drag margin for Android Navigation Drawer

android navigation-drawer
Patrick picture Patrick · Jun 7, 2013 · Viewed 14.5k times · Source

I am using the new Navigation Drawer in my app. It is great except I have not found an easy way to set how the drawer is open. The default behavior is drag from the left edge of the screen to open. This is fine, unless the phone/table has a case on and the edge of phone can not be touched. I would like to allow the user to touch and drag from a margin of the screen to the left. This is easy to set with other nav drawer libs(Sliding lib). I have not seen anything with Google's lib unfortunately.

There is an onTouchEvent() method for the NavigationLayout that could may be used. Of course you could listen to all touch events and trigger an openDrawer, but was hoping for an easy way with less code. Any ideas?

Answer

Maxim Efimov picture Maxim Efimov · Jul 23, 2013

Here I've found a solution via reflections

DrawerLayout mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
Field mDragger = mDrawerLayout.getClass().getDeclaredField(
        "mLeftDragger");//mRightDragger for right obviously
mDragger.setAccessible(true);
ViewDragHelper draggerObj = (ViewDragHelper) mDragger
        .get(mDrawerLayout);

Field mEdgeSize = draggerObj.getClass().getDeclaredField(
        "mEdgeSize");
mEdgeSize.setAccessible(true);
int edge = mEdgeSize.getInt(draggerObj);

mEdgeSize.setInt(draggerObj, edge * 5); //optimal value as for me, you may set any constant in dp

Related questions

Same Navigation Drawer in different Activities

I made a working navigation drawer like it's shown in the tutorial on the developer.android.com website. But now, I want to use one Navigation Drawer, i created in the NavigationDrawer.class for multiple Activities in my Application. My …

Read More
How do I use DrawerLayout to display over the ActionBar/Toolbar and under the status bar?

I've seen in the new material design Side Nav spec that you can display the drawer over the action bar and behind the status bar. How can I implement this?

Read More
Navigation drawer: How do I set the selected item at startup?

My code works perfectly: every time an item in Navigation Drawer is clicked the item is selected. Of course I want to start the app with a default fragment (home), but Navigation Drawer doesn't have the item selected. How can …

Read More