Coloring.java 文件源码

/**
 * Tries to clone and just color filter the drawable. Uses mode SRC_ATOP.
 *
 * @param drawable Which drawable to color
 * @param color Which color to use
 * @return A colored drawable ready for use
 */
@SuppressWarnings("RedundantCast")
public Drawable colorUnknownDrawable(@Nullable Drawable drawable, int color) {
    if (drawable instanceof DrawableWrapper || drawable instanceof android.support.v7.graphics.drawable.DrawableWrapper) {
        drawable = DrawableCompat.wrap(drawable);
        DrawableCompat.setTint(drawable, color);
        DrawableCompat.setTintMode(drawable, PorterDuff.Mode.SRC_ATOP);
        drawable = DrawableCompat.unwrap(drawable);
        return drawable;
    } else {
        try {
            // noinspection ConstantConditions
            Drawable copy = drawable.getConstantState().newDrawable();
            copy.mutate();
            copy.setColorFilter(color, SRC_ATOP);
            return copy;
        } catch (Exception e) {
            if (drawable != null) {
                Log.d(LOG_TAG, "Failed to color unknown drawable: " + drawable.getClass().getSimpleName());
            }
            return drawable;
        }
    }
}