MaterialResources.java 文件源码

/**
 * Returns the drawable object from the given attributes.
 *
 * <p>This method supports inflation of {@code <vector>} and {@code <animated-vector>} resources
 * on devices where platform support is not available.
 */
@Nullable
public static Drawable getDrawable(
    Context context, TypedArray attributes, @StyleableRes int index) {
  if (attributes.hasValue(index)) {
    int resourceId = attributes.getResourceId(index, 0);
    if (resourceId != 0) {
      Drawable value = AppCompatResources.getDrawable(context, resourceId);
      if (value != null) {
        return value;
      }
    }
  }
  return attributes.getDrawable(index);
}