Java 在ListView上显示Hashmap

我正在解析一些JSON数据—一个卡车密钥（id）和一个名称（值）。我把它放在一个HashMap中，只想在

列表视图中显示值

然而，我不断得到这个错误

HashMap不能转换为java.util.Map$条目

在这一行：
return（Map.Entry）mArrayList.get（position）在我的卡车适配器中

有人能看出我做错了什么吗？

下面是解析JSON的内容，将其添加到ArrayList，然后实例化listview适配器

private List<HashMap<String, String>>  listTrucks = new ArrayList<HashMap<String, String>>();

    for (int i = 0; i < arrayRecordSet.length(); i++) {
        record = arrayRecordSet.getJSONObject(i);
        map = new HashMap<>();
        map.put("MYKEY", record.getString("SOME TRUCK KEY"));
        map.put("MYVALUE", record.getString("SOME TRUCK VALUE"));

    listTrucks.add(map);
    }

    TruckAdapter truckAdapter = new TruckAdapter(listTrucks);
    lv.setAdapter(truckAdapter);

您正在定义一个
ArrayList
，但您正在尝试从
getItem
方法获取一个
Map.Entry
。您的列表应该是
ArrayList
，并修复加载方法：

Map.Entry<String, String> map;
for (int i = 0; i < arrayRecordSet.length(); i++) {
    record = arrayRecordSet.getJSONObject(i);
    map = new AbstractMap.SimpleEntry<String, String>(record.getString("SOME TRUCK KEY"), record.getString("SOME TRUCK VALUE"));
    listTrucks.add(map);
}

加载方法

for (int i = 0; i < arrayRecordSet.length(); i++) {
    record = arrayRecordSet.getJSONObject(i);
    listTrucks.add(new Truck(record.getString("SOME TRUCK KEY", record.getString("SOME TRUCK VALUE")));
}

@Override
public Map.Entry<String, String> getItem(int position) {
    Truck truck = listTrucks.get(position);
    return new AbstractMap.SimpleEntry<String, String>(truck.getTRKlTruckKey, truck.getTRKch10TruckNumber);
}

for（int i=0；i

检索方法

for (int i = 0; i < arrayRecordSet.length(); i++) {
    record = arrayRecordSet.getJSONObject(i);
    listTrucks.add(new Truck(record.getString("SOME TRUCK KEY", record.getString("SOME TRUCK VALUE")));
}

@Override
public Map.Entry<String, String> getItem(int position) {
    Truck truck = listTrucks.get(position);
    return new AbstractMap.SimpleEntry<String, String>(truck.getTRKlTruckKey, truck.getTRKch10TruckNumber);
}

@覆盖
公共映射。条目getItem（int位置）{
卡车=列表卡车。获取（位置）；
返回新的AbstractMap.SimpleEntry（truck.getTrkltruckey，truck.getTRKch10TruckNumber）；
}
创建一个名为
Truck
的类

for (int i = 0; i < arrayRecordSet.length(); i++) {
    record = arrayRecordSet.getJSONObject(i);
    Truck truck = new Truck();
    truck.setKey(record.getString("TRKlTruckKey"));
    truck.setNumber(record.getString("TRKch10TruckNumber"));

    listTrucks.add(truck);
}

我猜它只是hashmap而不是hashmap的arraylist，你能给我看看你的jsonShow JSON Response吗？我更新了问题，添加了JSON
for (int i = 0; i < arrayRecordSet.length(); i++) {
    record = arrayRecordSet.getJSONObject(i);
    Truck truck = new Truck();
    truck.setKey(record.getString("TRKlTruckKey"));
    truck.setNumber(record.getString("TRKch10TruckNumber"));

    listTrucks.add(truck);
}

public TruckAdapter(ArrayList<Truck> trucks){
    mArrayList = trucks;
}

@Override
public Truck getItem(int position) {
    return mArrayList.get(position);
}