How to close Drawer layout on BackPress in Android?

Question

I press the navigation drawer, then if I press back button, the app exits rather than returning to the previous activity. If I change the xml file, then this problem doesn't occur. So I think the problem is in the xml file. Can anyone tell me what is the problem? Here's the xml code.`

<ImageView
    android:id="@+id/imageView1"
    android:layout_width="500dp"
    android:layout_height="200dp"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:src="@drawable/blue_train" />

<TextView
    android:id="@+id/trainName"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_alignParentLeft="true"
    android:layout_marginBottom="200dp"
    android:layout_marginLeft="14dp"
    android:text="Train Name"
    android:textColor="@color/bluedark"
    android:textSize="15sp" />

<EditText
    android:id="@+id/etName"
    android:layout_width="150dp"
    android:layout_height="40dp"
    android:layout_alignBaseline="@+id/trainName"
    android:layout_alignBottom="@+id/trainName"
    android:layout_marginLeft="30dp"
    android:layout_toRightOf="@+id/trainName"
    android:background="@drawable/line"
    android:ems="10" >

    <requestFocus />
</EditText>

<Button
    android:id="@+id/getS"
    android:layout_width="150dp"
    android:layout_height="wrap_content"
    android:layout_below="@+id/etName"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="40dp"
    android:background="@drawable/button2"
    android:text="Get Train Schedule"
    android:textColor="@color/white" />

`

When you say you change the XML and the problem goes away - in what way do you change it? — SDJMcHattie, Mar 04 '14 at 21:35
I figured out, if I remove the EditText, it works. But why doesn't it work when I have the EditText? — alu, Mar 04 '14 at 21:41
Cause the EditText was requesting focus, if EditText isn't focused, then there's no problem — alu, Mar 04 '14 at 21:45

score 38 · Accepted Answer · answered Mar 04 '14 at 21:46

38

This will close the drawer when it's open and back is pressed rather than taking you back to the previous activity (or exiting).

DrawerLayout drawer...

@Override
public void onBackPressed() {
    // TODO Auto-generated method stub

    if(drawer.isDrawerOpen(Gravity.LEFT)){
        drawer.closeDrawer(Gravity.LEFT);
    }else{
        super.onBackPressed();
    }
}

answered Mar 04 '14 at 21:46

NameSpace

10,009
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40

You can also do it for multiple drawers. if(drawer.isDrawerOpen(Gravity.RIGHT)) drawer.closeDrawer(Gravity.RIGHT); – Kalel Wade Sep 09 '14 at 16:37

score 2 · Answer 2 · answered Oct 06 '14 at 06:50

2

ListView mDrawerList;

@Override
public void onBackPressed() {
// TODO Auto-generated method stub

if(mDrawerLayout.isDrawerOpen(mDrawerList)){
    mDrawerLayout.closeDrawer(mDrawerList);
}else{
    super.onBackPressed();
}
}

answered Oct 06 '14 at 06:50

ultimate

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2
10
20

score 1 · Answer 3 · answered Mar 03 '16 at 10:36

1

I have done this way:

private DrawerLayout mDrawerLayout;

onCreate():

mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);  
mDrawerLayout.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);

Hope this will help you.

answered Mar 03 '16 at 10:36

Hiren Patel

52,124
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score 0 · Answer 4 · answered Feb 07 '20 at 21:21

@Hiren Patel's answer is the most elegant so far, but you should set:

mDrawerLayout.setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS);

Or

mDrawerLayout.descendantFocusability = ViewGroup.FOCUS_BEFORE_DESCENDANTS

Just so you don't block the other child views from receiving focus, and thus blocking the soft keyboard for instance.

How to close Drawer layout on BackPress in Android?

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