解析：检索整个列并将其添加到ArrayList

Question

this blog post

我正在尝试检索“高分”列。我想在我的Android应用程序中的排行榜活动的列表视图中显示其所有值。活动开始但列表视图为空白。

 public class LeaderboardsList extends AppCompatActivity {

ArrayList<String> highscores;
ArrayAdapter arrayAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_leaderboards_list);

highscores = new ArrayList<String>();
arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, highscores);


    final ListView leaderboardList = (ListView) findViewById(R.id.listView);

    ParseQuery<ParseObject> query = ParseQuery.getQuery("GameScore");
    query.addAscendingOrder("highscore");

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

            if(e == null){

                if(objects.size() > 0){

                    for(ParseObject object: objects){

                            highscores.add(String.valueOf(object.getNumber("highscore")));

                    }

                    leaderboardList.setAdapter(arrayAdapter);

                }

            }

        }
    });

}

}