/**
* Check if two Drawables are equal. A regular check for a Drawable equals just checks for the
* instance reference, while this check is doing a deeper equals when dealing with {@link
* DrawableContainer} instances. In these cases, the method will run equals on each of the child
* drawables in the container (order is importance as well).
*
* @param d1
* @param d2
* @return <code>true</code> if the drawables are equal, <code>false</code> otherwise.
*/
public static boolean isEquals(Drawable d1, Drawable d2) {
if (d1 == d2) {
return true;
}
if (d1 == null || d2 == null) {
return false;
}
if (d1 instanceof DrawableContainer && d2 instanceof DrawableContainer) {
// Try to match the content of those containers
DrawableContainerState containerState1 =
(DrawableContainerState) ((DrawableContainer) d1).getConstantState();
DrawableContainerState containerState2 =
(DrawableContainerState) ((DrawableContainer) d2).getConstantState();
return Arrays.equals(containerState1.getChildren(), containerState2.getChildren());
}
return d1.equals(d2);
}
/**
* Returns a {@link Map} that holds a mapping from the existing state-lists in the background
* {@link Drawable}.
*
* @param background A {@link Drawable} background ( {@link StateListDrawable}).
* @return A {@link Map}. An empty map in case the background <code>null</code>, or is not a
* {@link StateListDrawable}.
*/
public static Map<int[], Drawable> getExistingStates(Drawable background) {
LinkedHashMap<int[], Drawable> map = new LinkedHashMap<int[], Drawable>();
if (background instanceof StateListDrawable) {
// Grab the existing states. Note that the API hides some of the
// public functionality with the @hide tag, so we have to access
// those through reflection...
StateListDrawable stateList = (StateListDrawable) background;
DrawableContainerState containerState = (DrawableContainerState) stateList.getConstantState();
Drawable[] children = containerState.getChildren();
try {
// This method is public but hidden ("pending API council")
Method method = stateList.getClass().getMethod("getStateSet", int.class);
for (int i = 0; i < containerState.getChildCount(); i++) {
Object state = method.invoke(stateList, i);
if (state instanceof int[]) {
map.put((int[]) state, children[i]);
}
}
} catch (Exception e) {
PXLog.e(PXViewStyleAdapter.class.getSimpleName(), e, "Error getting the state set");
}
}
return map;
}
