android - Setting src and background for FloatingActionButton -

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when use background , src in android.support.design.floatingactionbutton not set correctly. instead displayed as

enter image description here

<android.support.design.widget.floatingactionbutton android:id="@+id/fab" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/pink" android:src="@drawable/ic_action_barcode_2" android:layout_gravity="bottom|right" android:layout_marginbottom="16dp" android:layout_marginright="16dp" />

but when use imageview appears correctly

enter image description here

<imageview android:id="@+id/fab" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/pink" android:src="@drawable/ic_action_barcode_2" android:layout_gravity="bottom|right" android:layout_marginbottom="16dp" android:layout_marginright="16dp" />

why floatingactionbutton not displayed correctly? should change in code?

floating action button's background not need changed, apply tint , add icon usual

<android.support.design.widget.floatingactionbutton     ...     app:backgroundtint="@color/ic_action_barcode_2"     android:src="@drawable/ic_add" />

this provides round button still in colour desire. in case app namespace used support library features:

xmlns:app="http://schemas.android.com/apk/res-auto"


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