Android微调器显示对象引用而不是字符串

Question

好的,我的旋转器有问题.其中包含从Web服务中提取的数据.我所遇到的问题是,当没有点击微调器而不是显示微调器中第一个项目的字符串时,它会显示一个对象引用.

我看了相关的问题,但仍然看不到我缺少什么,是否像缺少toString参考一样简单？

这是填充微调器的代码

private void buildDrinkDropDown() {

        List<NameValuePair> apiParams = new ArrayList<NameValuePair>(1);
        apiParams.add(new BasicNameValuePair("call", "drinkList"));

        bgt = new BackGroundTask(MAP_API_URL, "GET", apiParams);

        try {

            JSONArray drinks = bgt.execute().get();

            for (int i = 0; i < drinks.length(); i++) {

                JSONObject d = drinks.getJSONObject(i);

                String id = d.getString(TAG_ID_DRINK);
                String createdAt = d.getString(TAG_CREATED_AT);
                String updatedAt = d.getString(TAG_UPDATED_AT);
                String price = d.getString(TAG_PRICE);
                String name = d.getString(TAG_NAME);

                drinkList.add(new Drink( createdAt ,id, name, price,updatedAt ));
            }

            drinkField = (Spinner) findViewById(R.id.countryField); 
            DrinkAdapter dAdapter = new DrinkAdapter(this, android.R.layout.simple_spinner_item, drinkList);
            drinkField.setAdapter(dAdapter);

            drinkField.setOnItemSelectedListener(new OnItemSelectedListener(){

                @Override
                public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                    //Drink selectedDrink = drinkList.get(position);
                    GlobalDrinkSelected = drinkList.get(position).getId().toString();

                }

                @Override
                public void onNothingSelected(AdapterView<?> parent) {}


            });

        } catch (JSONException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }
    }

这是适配器类的代码

package com.android.main;

import java.util.ArrayList;

import android.app.Activity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class DrinkAdapter extends ArrayAdapter<Drink>
{
    private Activity context;
    ArrayList<Drink> data = null;

    public DrinkAdapter(Activity context, int resource, ArrayList<Drink> data)
    {
        super(context, resource, data);
        this.context = context;
        this.data = data;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) 
    {   // Ordinary view in Spinner, we use android.R.layout.simple_spinner_item
        return super.getView(position, convertView, parent);   
    }

    @Override
    public View getDropDownView(int position, View convertView, ViewGroup parent)
    {   // This view starts when we click the spinner.
        View row = convertView;
        if(row == null)
        {
            LayoutInflater inflater = context.getLayoutInflater();
            row = inflater.inflate(R.layout.dropdown_value_id, parent, false);
        }

        Drink item = data.get(position);
        String test = item.getName();
        Log.d("test ", test);

        if(item != null)
        {   

            TextView drinkName = (TextView) row.findViewById(R.id.item_value);

            if(drinkName != null){
             drinkName.setText(item.getName());
             Log.d("find me ", drinkName.toString());
            }

        }

        return row;
    }
}

以下是适配器中使用的dropdown_value_id布局的xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/item_value"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</LinearLayout>

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编辑:截图

Answer 1

我遇到了类似的问题,但是我使用默认的ArrayAdapter而没有在单独的类中扩展它.仔细研究一下后,我发现了这个:

但是引用了TextView,它将填充数组中每个对象的toString().您可以添加自定义对象的列表或数组.覆盖对象的toString()方法,以确定将为列表中的项显示的文本.

默认的ArrayAdapter将在已传递给适配器的数组中的每个对象上调用.toString().如果您的DrinkAdapter只显示饮料的名称,您可以覆盖toString()方法并完成

适配器:

ArrayAdapter<Drink> drinkAdapter = new ArrayAdapter<Drink>(getActivity(), android.R.layout.simple_spinner_dropdown_item, drinks);

类对象:

public Drink {

    String name;

    // Constructor, getters, and setters for the object here

    @Override
    public String toString() {
        return getName(); // You can add anything else like maybe getDrinkType()
    }
}

而且你已经完成了,不需要为你的DrinkAdapter单独上课

Answer 2

我的想法很快:getView()方法用于表示行.你可以在getView()方法中实现像getDropDownView方法这样的类似编码吗？

将内容从getDropDownView方法复制到getView()方法

我没试过这个,但我在ListView中做了类似的一个,我在getView()方法中做了类似的编码.

如果我找到任何东西,我也会尝试在本地复制这个并发布.

Answer 3

好的,所以我通过做一些研究并查看这个问题的答案来解决这个问题自定义setDropDownViewResource微调项目的示例

我在getDropDownView中提取了我正在做的事情,并在getView和getDropDownView中调用它.

这是代码

package com.android.main;

import java.util.ArrayList;

import android.app.Activity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class DrinkAdapter extends ArrayAdapter<Drink>
{
    private Activity context;
    ArrayList<Drink> data = null;

    public DrinkAdapter(Activity context, int resource, ArrayList<Drink> data)
    {
        super(context, resource, data);
        this.context = context;
        this.data = data;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) 
    {   // Ordinary view in Spinner, we use android.R.layout.simple_spinner_item

        return initView(position, convertView, parent);  
    }

    @Override
    public View getDropDownView(int position, View convertView, ViewGroup parent)
    {   // This view starts when we click the spinner.
        return initView(position, convertView, parent);
    }

    private View initView(int position, View convertView, ViewGroup parent) {
        View row = convertView;
        if(row == null)
        {
            LayoutInflater inflater = context.getLayoutInflater();
            row = inflater.inflate(R.layout.dropdown_value_id, parent, false);
        }

        Drink item = data.get(position);
        String test = item.getName();
        Log.d("test ", test);

        if(item != null)
        {   

            TextView drinkName = (TextView) row.findViewById(R.id.item_value);

            if(drinkName != null){
             drinkName.setText(item.getName());
             Log.d("find me ", drinkName.toString());
            }

        }

        return row;
    }
}