Android – How to set shared checkable behavior across all groups in NavigationView

androidandroid-support-librarymaterial-designnavigation-drawernavigationview

I've created two groups with unique ids (I need a divider) and they both have checkableBehavior set to single. This allows multiple items from different groups to be checked at once, and that's exactly what I'm trying to avoid. I'd like to have one item checked at maximum, across all groups.

Since I haven't found any way to do this in XML, I tried to implement a simple logic in onNavigationItemSelected to uncheck the previous menu item:

if (previousItem != null)
   previousItem.setChecked(false);
currentItem.setChecked(true);

but setChecked(false) method has never worked for me – the item stays checked.

Here's my sample code:

menu_navigation.xml:

<menu xmlns:android="http://schemas.android.com/apk/res/android">
<group
        android:id="@+id/nav_group_1"
        android:checkableBehavior="single">
    <item
            android:id="@+id/nav_feed"
            android:title="@string/feed"/>
    <item
            android:id="@+id/nav_people"
            android:title="@string/people"/>
</group>
<group
        android:id="@+id/nav_group_2"
        android:checkableBehavior="single">
    <item
            android:id="@+id/nav_settings"
            android:title="@string/settings"/>
    <item
            android:id="@+id/nav_help_feedback"
            android:title="@string/help_feedback"/>
    <item
            android:id="@+id/nav_logout"
            android:title="@string/logout"/>
</group>

NavigationItemSelectedListener:

 mUiNavigationView.setNavigationItemSelectedListener(
                new NavigationView.OnNavigationItemSelectedListener() {
                    @Override
                    public boolean onNavigationItemSelected(MenuItem menuItem) {
                        if (previousItem != null)
                           previousItem.setChecked(false);
                        currentItem.setChecked(true);
                        //...
                        changeCurrentFragment(...);
                        return true;
                    }
                });

I need a hint! Thanks.

Best Solution

Here's the solution.

Step 1: Remove

android:checkableBehavior="single"

from both groups.

Step 2: Add the following logic to the listener:

mUiNavigationView.setNavigationItemSelectedListener(
            new NavigationView.OnNavigationItemSelectedListener() {
                @Override
                public boolean onNavigationItemSelected(MenuItem menuItem) {
                    menuItem.setCheckable(true);
                    menuItem.setChecked(true);
                    if (mPreviousMenuItem != null) {
                        mPreviousMenuItem.setChecked(false);
                    }
                    mPreviousMenuItem = menuItem;
                    //...
                    changeCurrentFragment(...);
                    return true;
                }
            });

Note: instead of calling menuItem.setCheckable(true) you can set android:checkable="true" for each item in XML.

@Moinkhan's solution should work as well (thanks, upvoted), but I didn't want to loop through menu's items each time a new position is selected.