java - 自定义 ParseQueryAdapter 未填充 Android ListView

Question

对于我正在制作的应用程序，我试图使用自定义 parsequeryadapter 子类使用从 parse.com 获得的数据填充 listView。基本上它只是在打开 Activity 时显示一个空白 Activity 。

适配器代码

package com.example.battlesim;

import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.parse.FindCallback;
import com.parse.ParseException;
import com.parse.ParseQuery;
import com.parse.ParseQueryAdapter;
import com.parse.ParseObject;

public class LeaderboardAdapter extends ParseQueryAdapter<ParseObject> {
    public Context context;

    public LeaderboardAdapter(Context c) {
        super(c, new ParseQueryAdapter.QueryFactory<ParseObject>(){


            public ParseQuery<ParseObject> create(){
//          public final ArrayList<String> leadersName;
//          public final ArrayList<Integer> leadersScore;
            ParseQuery<ParseObject> queryL = ParseQuery.getQuery("Character");
            queryL = queryL.whereNotEqualTo("name", null);
            queryL = queryL.orderByDescending("level");
            queryL.setLimit(10);
            try {
                queryL.find();
            } catch (ParseException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

            return queryL;

//          queryL.findInBackground(new FindCallback<ParseObject>() {
//              public void done(List<ParseObject> scoreList, ParseException e) {
//                  if (e == null) {
//                      for(int i = 0; i < 10; i++){
//                          leadersName.add(scoreList.get(i).getString("name"));
//                          leadersScore.add(scoreList.get(i).getInt("level"));
//                      }
//                  } else {
//                      Log.d("level", "Error: " + e.getMessage());
//                  }
//              }

            }
        });
        this.context = c;
    }



    public View getItemView(ParseObject o, View convertView, ViewGroup parent){
        View vi = convertView;
        if(convertView == null) vi = View.inflate(getContext(),  R.layout.board, null);
        super.getItemView(o, convertView, parent);
        TextView name = (TextView) vi.findViewById(R.id.name);
        TextView level = (TextView) vi.findViewById(R.id.level);

        name.setText(o.getString("name"));
        level.setText(o.getInt("level"));

        return vi;
    }

}

创建代码时的 Activity

LeaderboardAdapter adapter = new LeaderboardAdapter(this);
    adapter.loadObjects();

    ListView lv = (ListView) findViewById(R.id.listView1);
    lv.setAdapter(adapter);

Board.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <TextView
        android:id="@+id/name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="TextView" 
        android:textSize="25dip"/>

    <TextView
        android:id="@+id/level"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:text="TextView" 
        android:textSize="25dip"/>

</RelativeLayout>

抱歉，如果我的格式不对或忘记包含任何内容。我是 StackExchange 的新手，对 Android 编程有些陌生

Answer 1

将 queryL.whereNotEqualTo("name", null); 替换为 queryL.whereExists("name");