ReactToolbar.java 文件源码

/**
 * Sets an icon for a specific icon source. If the uri indicates an icon
 * to be somewhere remote (http/https) or on the local filesystem, it uses fresco to load it.
 * Otherwise it loads the Drawable from the Resources and directly returns it via a callback
 */
private void setIconSource(ReadableMap source, IconControllerListener controllerListener, DraweeHolder holder) {

  String uri = source != null ? source.getString(PROP_ICON_URI) : null;

  if (uri == null) {
    controllerListener.setIconImageInfo(null);
    controllerListener.setDrawable(null);
  } else if (uri.startsWith("http://") || uri.startsWith("https://") || uri.startsWith("file://")) {
    controllerListener.setIconImageInfo(getIconImageInfo(source));
    DraweeController controller = Fresco.newDraweeControllerBuilder()
            .setUri(Uri.parse(uri))
            .setControllerListener(controllerListener)
            .setOldController(holder.getController())
            .build();
    holder.setController(controller);
    holder.getTopLevelDrawable().setVisible(true, true);
  } else {
    controllerListener.setDrawable(getDrawableByName(uri));
  }

}