java - 解析 findInBackground 不添加到全局数组列表？

Question

这是我的代码 fragment ，对名称进行了少量修改。

String[] items;
ArrayList<String>tempListItems;

public void initList() {
        if(query()){
            items = new String[tempListItems.size()];
            items = tempListItems.toArray(items);
            Arrays.sort(items);

            Log.d("HSearch - initList", "Generate Clean List");
            Log.d("initList - temp size", Integer.toString(tempListItems.size()));
            Log.d("initList - items size", Integer.toString(items.length));
        }
    }

private boolean query() {
        tempListItems = new ArrayList<String>();
        ParseQuery<ParseObject> query = ParseQuery.getQuery("Table");
        query.orderByAscending("name");
        query.findInBackground(new FindCallback<ParseObject>() {
            @Override
            public void done(List<ParseObject> list, com.parse.ParseException e) {
                if (e == null) {
                    for (ParseObject name : list) {
                        tempListItems.add(name.getString("name"));
                    }
                } else {
                    Log.d("score", "Error: " + e.getMessage());
                }
            }
        });
        return true;
    }

我的问题出在 query() 中，如果我在 done() 之后检查 tempListItems 的大小，则大小不为空。但是，一旦 query() 完成并返回到 initList()，如果我再次检查 tempListItems，它是空的。

done() 是 query() 中的一个方法。我忘记了它的技术术语!

我不确定如何确保在 query() 和 done() 返回后保留对 tempListItems 的更改。

Answer 1

String[] items;
final ArrayList<String>tempListItems;
{
    tempListItems= new ArrayList<>();
}

public void initList() {
    if(query()){
        items = new String[tempListItems.size()];
        items = tempListItems.toArray(items);
        Arrays.sort(items);

        Log.d("HSearch - initList", "Generate Clean List");
        Log.d("initList - temp size", Integer.toString(tempListItems.size()));
        Log.d("initList - items size", Integer.toString(items.length));
    }
}

private boolean query() {
    ParseQuery<ParseObject> query = ParseQuery.getQuery("Table");
    query.orderByAscending("name");
    query.findInBackground(new FindCallback<ParseObject>() {
        @Override
        public void done(List<ParseObject> list, com.parse.ParseException e) {
            if (e == null) {
                for (ParseObject name : list) {
                    tempListItems.add(name.getString("name"));
                }
            } else {
                Log.d("score", "Error: " + e.getMessage());
            }
        }
    });
    return true;
}

Changed your code, this should work, as It worked for me.

Make your methods public to use in other classes.