DefaultLayoutPromptViewConfig.java 文件源码

/**
 * @return the dimension in px defined for the attribute at <code>index</code>, if defined; null otherwise
 */
@Nullable
@Px
private static Integer suppliedDimensionOrNull(
        @NonNull final TypedArray typedArray,
        @StyleableRes final int index) {

    final int dimensionPixelSize = typedArray.getDimensionPixelSize(index, DEFAULT_DIMENSION_VALUE_IF_UNDEFINED);

    //noinspection ResourceType
    return dimensionPixelSize != DEFAULT_DIMENSION_VALUE_IF_UNDEFINED ? dimensionPixelSize : null;
}