请给出一个示例代码(Android)，用于从JSON文件中填充3个微调器，如(converter，zone，code)

Question

我有3个微调器，我想将JSON数据解析到它们中。例如，JSON文件结构具有Converterno、zoneno和codeid。所以我想在一个微调器和zoneno中填充所有的转换器编号。在另一个旋转器和类似的第三个旋转器中。我正在android中尝试这一点，并尝试从json中解析数据。请帮忙。我的xml文件很好，只需要在java类中获得帮助，就可以获得下拉的值

这是我在@Lucefer 的帮助下编写的最新代码(Selectcode.java(

package com.example.com;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
public class selectcode extends AppCompatActivity {
String URL = "*url_to_json_php*";
List<String> converter = new ArrayList<>();
List<String> zone = new ArrayList<>();
List<String> codeid = new ArrayList<>();
JSONObject jsonObject;
JSONArray jsonArray;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_selectcode);
try{
jsonObject=new JSONObject(URL);
jsonArray=jsonObject.getJSONArray("server_response");
for (int i=0;i<jsonArray.length();i++){
jsonObject=jsonArray.getJSONObject(i);
converter.add(jsonObject.optString("converternumber"));
zone.add(jsonObject.optString("zonenumber"));
codeid.add(jsonObject.optString("codeid"));
}
} catch (JSONException e) {
e.printStackTrace();
}
Spinner spinner1=(Spinner) findViewById(R.id.selectconverter);
ArrayAdapter<String> adapter1=new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item);
spinner1.setAdapter(adapter1);
Spinner spinner2=(Spinner) findViewById(R.id.selectzone);
ArrayAdapter<String> adapter2=new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item);
spinner2.setAdapter(adapter2);
Spinner spinner3=(Spinner) findViewById(R.id.selectcode);
ArrayAdapter<String> adapter3=new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item);
spinner3.setAdapter(adapter3);
}
}

Answer 1

您需要在xml文件中创建三个snipper，然后可以像下面的一样提供数据

List<String> areas = new ArrayList<>();
List<String> schools = new ArrayList<>();
List<String> classes = new ArrayList<>();
jsonobject = JSONfunctions.getJSONfromURL("http://ww");
try {
jsonarray = jsonobject.getJSONArray("server_response");
for (int i = 0; i < jsonarray.length(); i++) {
jsonobject = jsonarray.getJSONObject(i);
areas.add(jsonobject.optString("converternumber"));
schools.add(jsonobject.optString("zonenumber"));
classes.add(jsonobject.optString("codeid"));
}
.......................
//finally u need to set those three lists to three snippers
Spinner spinner1 = (Spinner) findViewById(R.id.Spinner1); 
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, area);
adapter.setDropDownViewResource(android.R.layout.simple_spin‌​ner_dropdown_item);
spinner1.setAdapter(adapter);
Spinner spinner2 = (Spinner) findViewById(R.id.Spinner2); 
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, school);
adapter.setDropDownViewResource(android.R.layout.simple_spin‌​ner_dropdown_item);
spinner1.setAdapter(adapter);

Spinner spinner1 = (Spinner) findViewById(R.id.Spinner3); 
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, class);
adapter.setDropDownViewResource(android.R.layout.simple_spin‌​ner_dropdown_item);
spinner1.setAdapter(adapter);

Answer 2

我在得到了解决方案

CountryStateCitySpinner