RippleDrawable.java

…
@Override
protected boolean onStateChange(int[] stateSet) {
    final boolean changed = super.onStateChange(stateSet);

    boolean enabled = false;
    boolean pressed = false;
    boolean focused = false;
    boolean hovered = false;

    for (int state : stateSet) {
        if (state == R.attr.state_enabled) {
            enabled = true;
        } else if (state == R.attr.state_focused) {
            focused = true;
        } else if (state == R.attr.state_pressed) {
            pressed = true;
        } else if (state == R.attr.state_hovered) {
            hovered = true;
        }
    }

    setRippleActive(enabled && pressed);
    setBackgroundActive(hovered, focused, pressed);

    return changed;
}
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