android: dynamically change FAB(Floating Action Button) icon from code

Question

How to change FAB icon in an Activity during runtime. I have this code ->

FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fabMainActivity);

I know this is possible using fab.setBackgroundDrawable(); but i am a newbie to android, don't understand how to do this.

Any help will be highly appreciated.

Thanks

Solution 1

Changing FloatingActionButton source:

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            floatingActionButton.setImageDrawable(getResources().getDrawable(R.drawable.ic_full_sad, context.getTheme()));
        } else {
            floatingActionButton.setImageDrawable(getResources().getDrawable(R.drawable.ic_full_sad));
    }

This can be replaced by following code from the support library instead:

floatingActionButton.setImageDrawable(ContextCompat.getDrawable(getContext(), R.drawable.ic_full_sad));

Solution 2

If you are using the Support Library:

floatingActionButton.setImageResource(R.drawable.icon_name)

Solution 3

Or you use the Support Library:

floatingActionButton.setImageDrawable(ContextCompat.getDrawable(getContext(), R.drawable.ic_full_sad));

Solution 4

Assume that you will use the image ic_arrow_forward.png as your fab's background:

fab.setImageResource(R.mipmap.ic_arrow_forward);

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