在Android上從URL簡單解析JSON並顯示在列表視圖或微調器中

Question

我正在嘗試解析從我的應用程序中的URL提取的JSON result

我已經在Internet上嘗試了一些示例，但是無法使其正常工作。

數據如下所示：

[{"objectno":"CarlosG","objectname":"MJ1196H00167","objecttype":"car_station_wagon","postext":"11 km norte de Monterrey, en San Nicolás De Los Garza NL, Carretera Monterrey-Nuevo Laredo MEX-85 ","ignition":1,"drivername":"Carlos Gutierrez","longitude_mdeg":-100292728,"latitude_mdeg":25765772},{"objectno":"Demo","objectname":"MJ1196H00169","objecttype":"car","postext":"Adsum Culiacán Rosales, Calle Río San Lorenzo ","ignition":1,"drivername":"AutoDemo","longitude_mdeg":-107392146,"latitude_mdeg":24794140},{"objectno":"GustavoC","objectname":"MJ6146H01742","objecttype":"car_station_wagon","postext":"En Guadalajara JA, Calle George Frideric Handel / Calle A Las Montañas ","ignition":0,"drivername":"Gustavo Cortez","longitude_mdeg":-103421146,"latitude_mdeg":20675859}]

JSON格式

[

    {
        "objectno":"CarlosG",
        "objectname":"MJ1196H00167",
        "objecttype":"car_station_wagon",
        "postext":"11 km norte de Monterrey, en San Nicolás De Los Garza NL, Carretera Monterrey-Nuevo Laredo MEX-85 ",
        "ignition":1,
        "drivername":"Carlos Gutierrez",
        "longitude_mdeg":-100292728,
        "latitude_mdeg":25765772
    },
    {
        "objectno":"Demo",
        "objectname":"MJ1196H00169",
        "objecttype":"car",
        "postext":"Adsum Culiacán Rosales, Calle Río San Lorenzo ",
        "ignition":1,
        "drivername":"AutoDemo",
        "longitude_mdeg":-107392146,
        "latitude_mdeg":24794140
    },
    {
        "objectno":"GustavoC",
        "objectname":"MJ6146H01742",
        "objecttype":"car_station_wagon",
        "postext":"En Guadalajara JA, Calle George Frideric Handel / Calle A Las Montañas ",
        "ignition":0,
        "drivername":"Gustavo Cortez",
        "longitude_mdeg":-103421146,
        "latitude_mdeg":20675859
    }

]

我在列表視圖或微調器中需要它。

提取URL並解析JSON數據在listview或spinner顯示的最簡單方法是什么？

謝謝

Answer 1

您必須創建一個模態類和列表視圖適配器。

  Model.java

  public class Model {
     String field1, field2,... fieldn;

     public Model(JSONObject object) {
         field1 = object.optString("key1");
         field1 = object.optString("key2");
         .
         .
         fieldn = object.optString("keyn");
     }

     //getter methods of each fields (You've an option to auto generate them in Android Studio
}

現在從Activity類中創建一個像這樣的ArrayList

 ArrayList<Model> models = new ArrayList<>;
 for (int i = 0; i < jsonArray.length(); i++) {
     models.add(new Model(jsonArray.getJSONObject()));
 }

 //Populate List View
 ListView lv = findViewById(R.id.lv);
 CustomAdapter adapter = new CustomAdapter(models);
 lv.setAdapter(adapter);


 //Create a new class for the Custom adapter extending the BaseAdapter

 class CustomAdapter extends BaseAdapter {
         ArrayList<Model> models;

         public CustomAdapter(ArrayList<Model> models) {
             this.models = models;
         }

         View getView(...) {
             //Create your item view here
             // Use a ViewHolder to hold the Views

             //Access the data from the model
             Model model = (Model) getItem(position);

             holder.textView.setText(model.getField1());
              ........
              ........

             return convertView;
         }

         Object getItem(int position) {
              return models.get(position);
         }
}

我給了一個模特。 修改類以合並您的更改。