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I used this library https://github.com/futuresimple/android-floating-action-button. How can I change the image of the main button? I want to change the button image right after selecting one of the smaller buttons.
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Add the floating action button to your layout The size of the FAB, using the app:fabSize attribute or the setSize() method. The ripple color of the FAB, using the app:rippleColor attribute or the setRippleColor() method. The FAB icon, using the android:src attribute or the setImageDrawable() method.
To change the shape of the Floating action button: You can use the shape property of FloatingActionButton() widget class. Implement BeveledRectangleBorder( ) on this property. The output will be a square floating action button, increase the border-radius value to make a circular type shape.
From https://developer.android.com/reference/android/support/design/widget/FloatingActionButton.html
As this class descends from ImageView, you can control the icon which is displayed via setImageDrawable(Drawable).
Or you can use setImageResource():
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