Question

这是我的JSON文件：

IntVar

我原来的方法是在for循环中这样做：

from tkinter import *

def button_placement(canvas):
    xpos, ypos = 150, 25
    for button_number in range(1, 11):
        button = Button(canvas, width='5', height='2', text=button_number,
                    anchor=CENTER, command=
                    lambda id=button_number: button_action(id))
        window = canvas.create_window(xpos, ypos, window=button)
        ypos += 50

def button_action(button_identifier):
    print('Button {} pressed'.format(button_identifier))

root = Tk()
canvas = Canvas(root, height=500)
button_placement(canvas)
canvas.pack()
canvas.mainloop()

但如果我有100个或更多呢？

"charts": { "system_voltage": { "enabled": true, "title": "System Voltage", "xaxis_label": null, "yaxis_label": null, "y_min": 0, "y_max": 18, "status": false }, "temperature1": { "enabled": true, "title": "Box1 Temp", "xaxis_label": null, "yaxis_label": null, "y_min": -30, "y_max": 50, "status": false }, "temperature2": { "enabled": true, "title": "Amb Temp", "xaxis_label": null, "yaxis_label": null, "y_min": -30, "y_max": 50, "status": true }, ...内的每个对象都是唯一的。如何循环访问JSONObject并将每个对象分配给JSON数组而不手动执行？

JSONObject objSysVoltage = chartss.getJSONObject("system_voltage");

Answer 1

使用keys()方法获取所有密钥并获取JSONObject表单密钥。

Iterator<?> keys = chartss.keys();

while( keys.hasNext() ) {
  String key = (String)keys.next();
  if ( chartss.get(key) instanceof JSONObject ) {
      JSONObject josnObject = chartss.getJSONObject(key);
  }
}

Answer 2

使用JsonObjectRequest和JSONArray

JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
       @Override public void onResponse(JSONObject chartss) {
           try {
               JSONArray JA = chartss.getJSONArray("charts");
               String productArray[]= new String[JA.length()];
               for (int i=0; i<JA.length();i++){
                   productArray[i]=JA.getString(i);
                   Log.d("Result",JA.getString(i));

                   ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_dropdown_item_1line, productArray);
                   t2.setAdapter(dataAdapter);
                   String T1 = t2.getSelectedItem().toString();
                   t1.setText(T1);

               }

           } catch (JSONException e) {
               e.printStackTrace();
           }
       }
   }, new Response.ErrorListener() {

       @Override public void onErrorResponse(VolleyError error) {
           error.printStackTrace();
       }
   });
   rq.add(request);}

t2是一个微调器，t1是textview

t2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
   @Override
   public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
       t1.setText(productArray[position]);
   }

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

   }
});

转换JSON对象的JSON对象并将它们分配给Android中的JSON数组

2 个答案: