Question

public class Setting extends Activity implements OnClickListener {

    ListView listView1;
    ImageView backbutton;
    String Url = "http://182.71.212.110:8083/api/values/userdetails";
    String Id;
    String Designation;
    String EmployeeName;
    JSONArray _jarray;

    List<RowItem> rowItems;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.setting);
        listView1 = (ListView) findViewById(R.id.listView1);
        backbutton = (ImageView) findViewById(R.id.backbutton);
        backbutton.setOnClickListener(this);

        new GetUserdetail().execute();


        CustomList adapter = new CustomList(this, rowItems);
        listView1.setAdapter(adapter);
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        if (v.getId() == R.id.backbutton) {
            finish();
        }
    }

    class GetUserdetail extends AsyncTask<Void, Void, Void> {

        @Override
        protected void onPreExecute() {
            // TODO Auto-generated method stub
            super.onPreExecute();
        }

        @Override
        protected Void doInBackground(Void... params) {
            // TODO Auto-generated method stub
            try {
                String json = HttpHitter.ExecuteData(Url);
             _jarray = new JSONArray(json);
                System.out.println("_jarray" + _jarray);

                for (int i = 0; i <= _jarray.length(); i++) {
                    JSONObject _obj = _jarray.getJSONObject(i);

                    Id = _obj.getString("Id");
                    Designation = _obj.getString("Designation");
                    EmployeeName = _obj.getString("EmployeeName");
                    System.out.println(Id + "" + Designation + ""
                            + EmployeeName);
                }

            } catch (JSONException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            // TODO Auto-generated method stub
            super.onPostExecute(result);
            rowItems = new ArrayList<RowItem>();


        }
    }

}

这是我的代码，我能够在Jason解析这一行System.out.println之后显示值（Id +＆＃34;＆＃34; + Designation +＆＃34;＆＃34; + EmployeeName）;

但我无法在Listview中打印数据，我创建时会出现错误数据模型

public class RowItem {

    public RowItem(String title, String desc) {

        this.title = title;
        this.desc = desc;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }

    private String title;
    private String desc;
}

我已经创建了适配器，我从Base适配器扩展，工作正常，请告诉我如何绑定值并在列表视图中显示Json Parsing之后请建议我尝试实现。

Answer 1

使用Custom Adapter将 JSON数据绑定到Listview ，如下所示：

public class ListViewAdapterForLead extends BaseAdapter {
   Context context;
   LayoutInflater inflater;
   ArrayList<SpinnerNavItem> data;
   TextView txtText;


   public ListViewAdapterForLead(Context context,ArrayList<SpinnerNavItem> arraylist) {
       this.context = context;
       data = arraylist;

   }

   @Override
   public int getCount() {
       return data.size();
   }

   @Override
   public Object getItem(int index) {
       return data.get(index);
   }

   @Override
   public long getItemId(int position) {
       return position;
   }

   public View getView(final int position, View convertView, ViewGroup parent) {
       if (convertView == null) {
        LayoutInflater mInflater = (LayoutInflater)
                context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
        convertView = mInflater.inflate(R.layout.row_lead, null);
    }


    txtText = (TextView) convertView.findViewById(R.id.textLeadMenu);



    txtText.setText(data.get(position).getTitle());
    return convertView;




   }



   public View getDropDownView(int position,View convertView,ViewGroup parent){

       if (convertView == null) {
            LayoutInflater mInflater = (LayoutInflater)
                    context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
            convertView = mInflater.inflate(R.layout.row_lead, null);
        }


        txtText = (TextView) convertView.findViewById(R.id.textLeadMenu);


        txtText.setText(data.get(position).getTitle());


    return convertView;

    }
 }

Answer 2

在自定义适配器的getView()方法中绑定您的值。

Answer 3

您应该在后台任务完成后设置数据。

*首先尝试在onPostExecute（）方法中设置列表适配器 *确保模型中的所有细节都已填满 *在Adapter类中使用getView（）方法来解析数据。

有关使用BaseAdapter的ListView的示例代码，请参阅以下链接
http://www.androidhive.info/2012/02/android-custom-listview-with-image-and-text/

Answer 4

你忘了一件事，这就是List为空的原因

将解析后的数据添加到列表

 //initialize your list here
 rowItems = new List<RowItems>();

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

                         JSONObject _obj = _jarray.getJSONObject(i);
                            RowItemsr = new RowItems();
                        Id = _obj.getString("Id");
                        Designation = _obj.getString("Designation");
                        EmployeeName = _obj.getString("EmployeeName");
                        System.out.println(Id + "" + Designation + ""
                                + EmployeeName);
                       // you must create an object and add it to your list
                         r.setTitle(EmployeeName);
                         r.setDesc(Designation);
                        rowItems.add(r);
                    }

这就是你需要的

在Json Parsing之后无法在android中的listview中打印数据

4 个答案: