检查ParseQuery是否正在加载

Question

在我的Fragment中，ParseQuery成功查询如下：

                comments = new ParseQuery<ParseObject>("CommentItem");
                comments.setLimit(99);
                comments.whereEqualTo("parentUser", feedUserName);
                comments.whereEqualTo("parentFeed", feedItem);
                comments.findInBackground(new FindCallback<ParseObject>() {
                    @Override
                    public void done(List<ParseObject> mobjects, ParseException e) {

                        if(e == null){

                            for(ParseObject object : objects){




                            }


                        }


                    }
                });

但是，如果连接速度很慢，则在查询之前只能看到背景。如何在加载解析查询时显示加载符号？

Answer 1

您需要在执行findInBackground之前显示进度对话框并在回调中将其关闭。 所以你的代码应如下所示：

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comments = new ParseQuery < ParseObject > ("CommentItem");
comments.setLimit(99);
comments.whereEqualTo("parentUser", feedUserName);
comments.whereEqualTo("parentFeed", feedItem);

// show progres dialog 
final ProgressDialog myDialog = ProgressDialog.show(this, "Loading...","Loading Results...", true);

comments.findInBackground(new FindCallback < ParseObject > () {@
  Override
  public void done(List < ParseObject > mobjects, ParseException e) {

    myDialog.dismiss();  // remove progress dialog on finish
    if (e == null) {

      for (ParseObject object: objects) {




      }


    }


  }
});

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祝你好运。