ReactWebViewManager.java 文件源码

private WebView.PictureListener getPictureListener() {
  if (mPictureListener == null) {
    mPictureListener = new WebView.PictureListener() {
      @Override
      public void onNewPicture(WebView webView, Picture picture) {
        dispatchEvent(
          webView,
          new ContentSizeChangeEvent(
            webView.getId(),
            webView.getWidth(),
            webView.getContentHeight()));
      }
    };
  }
  return mPictureListener;
}