java - Parse.com 获取查询并将其转换为字符串 Java

Question

我想做的是查询一个类并获取一些字符串。但是下面的代码返回类似 ;

com.parse.ParseObject@b4209180

而且我无法将其设置为正常的字符串值。

ParseQuery<ParseObject> query = ParseQuery.getQuery("question");
//query.whereKeyExists:@"objectId"
query.whereExists("questionTopic");

query.findInBackground(new FindCallback<ParseObject>() {

    @Override
    public void done(List<ParseObject> topics, ParseException e) {
        // TODO Auto-generated method stub
        if(e==null){


                textview.setText(topics.toString());

            }


        }else{
             Log.d("notretreive", "Error: " + e.getMessage());
        }


    }
});

Answer 1

代码中的“主题”是问题对象的列表。您需要从该对象中获取主题。这应该让你上路:

ParseQuery<ParseObject> query = ParseQuery.getQuery("question");
query.whereExists("questionTopic");

query.findInBackground(new FindCallback<ParseObject>() {

    @Override
    public void done(List<ParseObject> questions, ParseException e) {
        // The query returns a list of objects from the "questions" class
        if(e==null){
          for (ParseObject question : questions) {
            // Get the questionTopic value from the question object
            Log.d("question", "Topic: " + question.getString("questionTopic");
          }       
        } else {
             Log.d("notretreive", "Error: " + e.getMessage());
        }
    }
});