在textview android中显示json数组不起作用

Posted 2023-04-19

【中文标题】在textview android中显示json数组不起作用

【英文标题】：display json array in textview android not working

【发布时间】：2020-07-21 04:50:17

【问题描述】：

我的 JSON 数组不起作用，我不知道为什么。在日志中，它只显示：[]，没有别的。我不会在文本视图中使用它。

这是我的代码：

private void account()
// get from the server
    String url = "my url";

JsonObjectRequest request = new JsonObjectRequest(Request.Method.POST, url, null,
  new Response.Listener<JSONObject>() 
    @Override
    public void onResponse(JSONObject response) 

      try 
        JSONArray jsonArray = response.getJSONArray("uaccount");
        Log.i("conso", jsonArray.toString());

        for (int i = 0; i < jsonArray.length(); i++) 
          JSONObject employee = jsonArray.getJSONObject(i);
          Log.i("con", employee.toString());
          //Log.i("con", name+ number+status+ age+ city+ town+ gender+weight +height);

          String city = employee.getString("city");
          String town = employee.getString("town");

          txt_City.setText(""+city);
          txt_Town.append(town);
          //Log.i("co", city + town);

        
       catch (JSONException e) 
        Log.i("console.logs e:", e.toString());

        e.printStackTrace();
      
    
  , new Response.ErrorListener() 
  @Override
  public void onErrorResponse(VolleyError error) 
    Log.i("console.logs error:", error.toString());

    error.printStackTrace();
  
);

requestQueue = Volley.newRequestQueue(getActivity());
requestQueue.add(request);

【问题讨论】：

请通过断点显示你的response变量内部数据

在 logcat 中？在我的日志猫响应中只显示：“uaccount”：[]

【参考方案1】：

我用 id 尝试了这段代码：

在onreate：

uAccount("3");

在方法中

  private void uAccount(final String id)
// get from server
    String url = "my url";

JsonObjectRequest request = new JsonObjectRequest(Request.Method.POST, url, null,
  new Response.Listener<JSONObject>() 
    @Override
    public void onResponse(JSONObject response) 

      try 
        JSONArray jsonArray = response.getJSONArray("uaccount");
        Log.i("conso", jsonArray.toString());

        for (int i = 0; i < jsonArray.length(); i++) 
          JSONObject employee = jsonArray.getJSONObject(i);
          Log.i("con", employee.toString());
          //Log.i("con", name+ number+status+ age+ city+ town+ gender+weight +height);

          String city = employee.getString("city");
          String town = employee.getString("town");

          txt_City.setText(""+city);
          txt_Town.append(town);
          //Log.i("co", city + town);

        
       catch (JSONException e) 
        Log.i("console.logs e:", e.toString());

        e.printStackTrace();
      
    
  , new Response.ErrorListener() 
  @Override
  public void onErrorResponse(VolleyError error) 
    Log.i("console.logs error:", error.toString());

    error.printStackTrace();
  
)
  @Override
  protected Map<String, String> getParams() throws AuthFailureError 
    Map<String, String> params = new HashMap<>();
    params.put("id",id);

    return params;
  
;

requestQueue = Volley.newRequestQueue(getActivity());
requestQueue.add(request);