Android的列表视图中添加相同的项目 [英] Android Listview Adds The Same Item

问题描述

我开发一个Android应用程序，我使用的是Android的ListView。我从Web服务越来越DATAS并把它们填进ArrayList中。它的尺寸为37然后我尝试填充ArrayList中的列表视图，但它总是得到相同的元素（最后一个）。下面你可以看到code部分：

 私人无效ctv_listele（字符串RES）{
ArrayList的＆LT;＆CTV GT; ctvList =新的ArrayList＆LT;＆CTV GT;（）;尝试{
    的JSONObject的JSONObject =新的JSONObject（RES）;
    JSONArray jsonArray = jsonObject.getJSONArray（tarife）;
    INT最大= jsonArray.length（）;
    的for（int i = 0; I＆LT;最大;我++）{
        的JSONObject TMP = jsonArray.getJSONObject（ⅰ）;
        ctv.setYear（tmp.getString（年））;
        ctv.setYearlyCost（tmp.getString（YearlyCost））;
        ctv.setMonthlyCost（tmp.getString（MonthlyCost））;
        ctv.setGroup（tmp.getString（「本集团」））;
        ctv.setDegree（tmp.getString（度））;
        Log.e（增加，tmp.getString（YearlyCost））;
        ctvList.add（CTV）;
    }
    Log.e（结束，将String.valueOf（ctvList.size（）））;
}赶上（JSONException E）{
    // TODO自动生成catch块
    e.printStackTrace（）;
}
  ListView控件productList的=（的ListView）findViewById（R.id.listView_ctv）;
  MyCustomAdapter适配器=新MyCustomAdapter（这一点，R.layout.ctv_row，ctvList）;
  productList.setAdapter（适配器）;}
公共类MyCustomAdapter扩展ArrayAdapter＆LT;＆CTV GT; {私人活动范围内;
私人的ArrayList＆LT;＆CTV GT;清单当然;
私人LayoutInflater layoutInflater;
私人AdapterSatir adaSatir;公共MyCustomAdapter（活动方面，诚信ctvRow，ArrayList的＆LT;＆CTV GT;对象）{
    超（背景下，R.layout.ctv_row，对象）;
    this.context =背景;
    this.liste =物体;
    Log.e（清单当然，将String.valueOf（liste.size（）））;
}@覆盖
公共查看getView（INT位置，查看convertView，父母的ViewGroup）{查看view_satir = convertView;
    如果（view_satir == NULL）{
        adaSatir =新AdapterSatir（）;
        layoutInflater = context.getLayoutInflater（）;
        view_satir = layoutInflater.inflate（R.layout.cevretemizliktarifeleri_row，空，真）;
        adaSatir.textView1 =（TextView中）view_satir.findViewById（R.id.textView_ctvlist1）;
        adaSatir.textView2 =（TextView中）view_satir.findViewById（R.id.textView_ctvlist2）;
        adaSatir.textView3 =（TextView中）view_satir.findViewById（R.id.textView_ctvlist3）;
        adaSatir.textView4 =（TextView中）view_satir.findViewById（R.id.textView_ctvlist4）;
        view_satir.setTag（adaSatir）;
    }其他{
        adaSatir =（AdapterSatir）view_satir.getTag（）;
    }
    adaSatir.textView1.setText（liste.get（位置）.getDegree（））;
    adaSatir.textView2.setText（liste.get（位置）.getGroup（））;
    adaSatir.textView3.setText（liste.get（位置）.getMonthlyCost（））;
    adaSatir.textView4.setText（liste.get（位置）.getYearlyCost（））;
    返回view_satir;
}私有类AdapterSatir
{
    公众的TextView textView1;
    公众的TextView textView2;
    公众的TextView textView3;
    公众的TextView textView4;
}
}
 

解决方案

 的for（int i = 0; I＆LT;最大;我++）{
        的JSONObject TMP = jsonArray.getJSONObject（ⅰ）;
        ctv.setYear（tmp.getString（年））;
        ctv.setYearlyCost（tmp.getString（YearlyCost））;
        ctv.setMonthlyCost（tmp.getString（MonthlyCost））;
        ctv.setGroup（tmp.getString（「本集团」））;
        ctv.setDegree（tmp.getString（度））;
        Log.e（增加，tmp.getString（YearlyCost））;
        ctvList.add（CTV）;
    }
 

您忘记在每次迭代的init你CVT对象。所以，你总是添加相同的参考到列表中。

 的for（int i = 0; I＆LT;最大;我++）{
        的JSONObject TMP = jsonArray.getJSONObject（ⅰ）;
        CTV = CVT无级变速器的新（）;
        ctv.setYear（tmp.getString（年））;
        ctv.setYearlyCost（tmp.getString（YearlyCost））;
        ctv.setMonthlyCost（tmp.getString（MonthlyCost））;
        ctv.setGroup（tmp.getString（「本集团」））;
        ctv.setDegree（tmp.getString（度））;
        Log.e（增加，tmp.getString（YearlyCost））;
        ctvList.add（CTV）;
    }
 

I'm developing an Android Application and I'm using Android ListView. I'm getting datas from the web service and fill them into the Arraylist. It's size is 37. Then i try to fill the listview with Arraylist but it always get the same element(last one). Below you can see the code part:

private void ctv_listele(String res){
ArrayList<CTV> ctvList = new ArrayList<CTV>();

try {
    JSONObject jsonObject = new JSONObject(res);
    JSONArray jsonArray = jsonObject.getJSONArray("tarife");
    int max = jsonArray.length();
    for(int i = 0; i < max; i++) {
        JSONObject tmp = jsonArray.getJSONObject(i);
        ctv.setYear(tmp.getString("Year"));
        ctv.setYearlyCost(tmp.getString("YearlyCost"));
        ctv.setMonthlyCost(tmp.getString("MonthlyCost"));
        ctv.setGroup(tmp.getString("Group"));
        ctv.setDegree(tmp.getString("Degree"));
        Log.e("Added",tmp.getString("YearlyCost"));
        ctvList.add(ctv);
    }
    Log.e("End",String.valueOf(ctvList.size()));
} catch (JSONException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}
  ListView productList = (ListView) findViewById(R.id.listView_ctv);
  MyCustomAdapter adapter = new MyCustomAdapter(this, R.layout.ctv_row, ctvList);
  productList.setAdapter(adapter);

}


public class MyCustomAdapter extends ArrayAdapter<CTV>{

private Activity context;
private ArrayList<CTV> liste;
private LayoutInflater layoutInflater;
private AdapterSatir adaSatir;

public MyCustomAdapter(Activity context, int ctvRow, ArrayList<CTV> objects) {
    super(context, R.layout.ctv_row, objects);
    this.context=context;
    this.liste=objects;
    Log.e("liste",String.valueOf(liste.size()));
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

View view_satir=convertView;
    if(view_satir==null) {
        adaSatir=new AdapterSatir();
        layoutInflater=context.getLayoutInflater();
        view_satir=layoutInflater.inflate(R.layout.cevretemizliktarifeleri_row, null,true);
        adaSatir.textView1=(TextView) view_satir.findViewById(R.id.textView_ctvlist1);
        adaSatir.textView2=(TextView) view_satir.findViewById(R.id.textView_ctvlist2);
        adaSatir.textView3=(TextView) view_satir.findViewById(R.id.textView_ctvlist3);
        adaSatir.textView4=(TextView) view_satir.findViewById(R.id.textView_ctvlist4);
        view_satir.setTag(adaSatir);
    } else {
        adaSatir = (AdapterSatir) view_satir.getTag();
    }
    adaSatir.textView1.setText(liste.get(position).getDegree());
    adaSatir.textView2.setText(liste.get(position).getGroup());
    adaSatir.textView3.setText(liste.get(position).getMonthlyCost());
    adaSatir.textView4.setText(liste.get(position).getYearlyCost());
    return view_satir;
}

private class AdapterSatir
{
    public TextView textView1;
    public TextView textView2;
    public TextView textView3;
    public TextView textView4;
}
}

解决方案

for(int i = 0; i < max; i++) {
        JSONObject tmp = jsonArray.getJSONObject(i);
        ctv.setYear(tmp.getString("Year"));
        ctv.setYearlyCost(tmp.getString("YearlyCost"));
        ctv.setMonthlyCost(tmp.getString("MonthlyCost"));
        ctv.setGroup(tmp.getString("Group"));
        ctv.setDegree(tmp.getString("Degree"));
        Log.e("Added",tmp.getString("YearlyCost"));
        ctvList.add(ctv);
    }

you forget to init your cvt object at every iteration. So you add always the same reference to the list.

for(int i = 0; i < max; i++) {
        JSONObject tmp = jsonArray.getJSONObject(i);
        CTV cvt = new CVT();
        ctv.setYear(tmp.getString("Year"));
        ctv.setYearlyCost(tmp.getString("YearlyCost"));
        ctv.setMonthlyCost(tmp.getString("MonthlyCost"));
        ctv.setGroup(tmp.getString("Group"));
        ctv.setDegree(tmp.getString("Degree"));
        Log.e("Added",tmp.getString("YearlyCost"));
        ctvList.add(ctv);
    }

这篇关于Android的列表视图中添加相同的项目的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！