Android：自定义 ArrayAdapter 不工作，getView() 未被调用

Question

我正在使用 CustomArrayAdapter 和 ListView。但是，即使在设置 setAdapter 之后它也不起作用。以下是我的代码片段：

PastOrders.java 片段显示listView

public class PastOrders extends Fragment {
private View view;
private ListView pastOrdersList;
private Context context;
private ArrayList<Order> orders;
public PastOrders() {

}

@Override
public View onCreateView(final LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    super.onCreateView(inflater, container, savedInstanceState);
    view = inflater.inflate(R.layout.fragment_pastorders, container, false);
    context = getActivity();
    pastOrdersList = (ListView) view.findViewById(R.id.pastOrdersList);

    ParseQuery<ParseObject> query  = ParseQuery.getQuery("Order");
    query.whereEqualTo("user_id", Vars.currentUser);

    query.findInBackground(new FindCallback<ParseObject>() {
        @Override
        public void done(List<ParseObject> objects, ParseException e) {
            if(e != null) {
                Log.e("TAG", e.getLocalizedMessage());
            } else {

                ArrayList<Order> orders = new ArrayList<Order>();

                Log.i("TAG", objects.toString());

                for (ParseObject object: objects) {
                    Order temp = new Order();
                    temp.orderId = object.getObjectId();
                    temp.date = object.getCreatedAt();
                    temp.status = object.getString("status");
                    Log.i("TAG", "orderID: "+ object.getObjectId() + " temp orderID"+ temp.orderId);
                    orders.add(temp);
                    Vars.pastOrders.add(object);
                }

                Log.i("TAG", "after for loop past orders: "+ orders.toString());
                PastOrdersAdapter pastOrdersAdapter = new PastOrdersAdapter(getActivity(), R.layout.past_orders_row, orders);
                pastOrdersList.setAdapter(pastOrdersAdapter);

            }
        }
    });

    return view;
}

@Override
public void onResume() {
    super.onResume();
}
  }

PastOrdersAdapter.java 自定义适配器

public class PastOrdersAdapter extends ArrayAdapter<Order> {

private Context context;
private ViewHolder holder;
//private ArrayList<Order> orders;

public PastOrdersAdapter(Context context, int resource, List<Order> orders) {
    super(context, resource);
   // this.orders = orders;
    Log.i("TAG", "POA adapter called");
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    Log.i("TAG", "getView from POA");
    LayoutInflater inflater = ((Activity) context).getLayoutInflater();
    if (convertView == null) {
        convertView = inflater
                .inflate(R.layout.past_orders_row, parent, false);
        holder = new ViewHolder();
        holder.orderId = (TextView) convertView.findViewById(R.id.orderId);
        holder.date = (TextView) convertView.findViewById(R.id.date);
        holder.status = (TextView) convertView.findViewById(R.id.status);

        holder.details = (ImageView) convertView.findViewById(R.id.details);


        convertView.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();
    }

    ParseObject order = Vars.pastOrders.get(position);

    Log.i("TAG", "order id in adapter: "+ order.getObjectId());

    if(order != null) {
        holder.orderId.setText(order.getObjectId());
        holder.date.setText(getFormattedDate(order.getCreatedAt()));
        holder.status.setText(order.getString("status"));

        if(order.getString("status").equals("Delivered")) {
            holder.status.setTextColor(Color.GREEN);
        } else if(order.getString("status").equals("Cancelled")) {
            holder.status.setTextColor(Color.RED);
        } else {
            holder.status.setTextColor(Color.YELLOW);
        }
    }


    return convertView;
}

static class ViewHolder {

    TextView orderId;
    TextView date;
    TextView status;

    ImageView details;
}

}

Order.java

public class Order {

public String orderId;
public Date date;
public String status;
}

fragment_pastorders.xml 显示 ListView 的 Fragment 的布局文件

<?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" >

<ListView
    android:id="@+id/pastOrdersList"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
</ListView>

</RelativeLayout>

past_orders_row.xml listview每一行的布局文件

<?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="150dp">

<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="150dp"
    android:orientation="vertical"
    android:id="@+id/LinearLayout01">

    <TextView
        android:id="@+id/orderId"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:textStyle="bold" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/date"
        android:textStyle="italic"/>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/status"/>
</LinearLayout>

<ImageView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/ic_action_next_item"
    android:layout_toRightOf="@id/LinearLayout01"
    android:layout_centerVertical="true"
     android:id="@+id/details"/>
</RelativeLayout>

我也试过打印 getCount() 并且它是非零的。我已经尝试了一切。请帮助

谢谢，

阿皮特

Answer 1

在自定义适配器的构造函数中，您忘记将 orders 参数传递给父构造函数。所以你的适配器不知道要显示什么。

Answer 2

您正在将空列表订单传递给您的适配器。然后在适配器中使用不同的列表：Vars.pastOrders。所以你的适配器有空列表。替换为：

PastOrdersAdapter pastOrdersAdapter = 
     new PastOrdersAdapter(getActivity(), R.layout.past_orders_row, orders);

有了这个：

PastOrdersAdapter pastOrdersAdapter = 
     new PastOrdersAdapter(getActivity(), R.layout.past_orders_row, Vars.pastOrders);

Android：自定义 ArrayAdapter 不工作，getView() 未被调用

Android: Custom ArrayAdapter not working, getView() not getting called

android

android-arrayadapter

android-listview

android-fragments