CODEWITHSUNDEEP
androidandroid-support-librarybottomnavigationview
prom85
prom85

Reputation: 17798

Design BottomNavigationView - set background color in code

Is there any way to set the background color of the new design libraries BottomNavigationView in code to a custom color value instead of a color resource? Any "trick" maybe?

My current solution:

But this looks ugly, especially as I have to use a custom behaviour for the background view to be animated in parallel with the BottomNavigationView in the parent CoordinatorLayout...

Upvotes: 1

Views: 7736

Answers (2)

Daniel Beltrami
Daniel Beltrami

Reputation: 776

After many search, only this resolve my case:

bottomNavigationView.setItemBackground(new ColorDrawable(color));

Here I set each one of background item.

Upvotes: 0

prom85
prom85

Reputation: 17798

Solved it myself.

Solution 1

I just setup all items with a transparent background (this needs one resource file only) and then I theme the BottomNavigationView actual background itself.

bottomBar.setBackground(new ColorDrawable(color));
bottomBar.setItemBackgroundResource(R.drawable.transparent);

Resource drawable - transparent.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
    <solid android:color="@android:color/transparent" />
</shape>

Solution 2 - via reflection (support library 25.0.0)

public void themeBottomBarBackgroundWithReflection(BottomNavigationView bottomBar, int color)
{
    try
    {
        Field mMenuViewField = BottomNavigationView.class.getDeclaredField("mMenuView");
        mMenuViewField.setAccessible(true);
        BottomNavigationMenuView mMenuView = (BottomNavigationMenuView)mMenuViewField.get(bottomBar);
        Field mButtonsField = BottomNavigationMenuView.class.getDeclaredField("mButtons");
        mButtonsField.setAccessible(true);
        BottomNavigationItemView[] mButtons = (BottomNavigationItemView[])mButtonsField.get(mMenuView);

        for (BottomNavigationItemView item : mButtons) {
            ViewCompat.setBackground(item, new ColorDrawable(color));
        }
    }
    catch (NoSuchFieldException e)
    {
        e.printStackTrace();
    }
    catch (IllegalAccessException e)
    {
        e.printStackTrace();
    }
}

Upvotes: 8

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