@Override
public ActionMode startActionMode(ActionMode.Callback callback) {
  ActionMode actionMode = super.startActionMode(callback);
  return resolveActionMode(actionMode);
}
@Override
public ActionMode startActionMode(ActionMode.Callback callback, int type) 
  ActionMode actionMode = super.startActionMode(callback, type);
  return resolveActionMode(actionMode);
}

/**
 * 处理item，处理点击
 * @param actionMode
 */
private ActionMode resolveActionMode(ActionMode actionMode) {
  if (actionMode != null) {
    final Menu menu = actionMode.getMenu();
    mActionMode = actionMode;
    menu.clear();
    for (int i = 0; i < mActionList.size(); i++) {
      menu.add(mActionList.get(i));
    }
    for (int i = 0; i < menu.size(); i++) {
      MenuItem menuItem = menu.getItem(i);
      menuItem.setOnMenuItemClickListener(new Item.OnMenuItemClickListener() {
        @Override
        public boolean onMenuItemClick(MenuItem item) {
          getSelectedData((String) item.getTitle());
          releaseAction();
          return true;
        }
      });
    }
  }
  mActionMode = actionMode;
  return actionMode;
}

public void linkJSInterface() {
  addJavascriptInterface(new ActionSelectInterface(this), "JSInterface");
}
···
/**
 * js选中的回调接口
 */
private class ActionSelectInterface {
  CustomActionWebView mContext;
  ActionSelectInterface(CustomActionWebView c) {
    mContext = c;
  }
  @JavascriptInterface
  public void callback(final String value, final String title) {
    if(mActionSelectListener != null) {
      mActionSelectListener.onClick(title, value);
    }
  }
}

/**
 * 点击的时候，获取网页中选择的文本，回掉到原生中的js接口
 * @param title 传入点击的item文本，一起通过js返回给原生接口
 */
private void getSelectedData(String title) {
  String js = "(function getSelectedText() {" +
      "var txt;" +
      "var title = \"" + title + "\";" +
      "if (window.getSelection) {" +
      "txt = window.getSelection().toString();" +
      "} else if (window.document.getSelection) {" +
      "txt = window.document.getSelection().toString();" +
      "} else if (window.document.selection) {" +
      "txt = window.document.selection.createRange().text;" +
      "}" +
      "JSInterface.callback(txt,title);" +
      "})()";
  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
    evaluateJavascript("javascript:" + js, null);
  } else {
    loadUrl("javascript:" + js);
  }
}