Java 将数据从JSON ArrayList加载到微调器
我似乎不明白这一点,因为我只是一个android的初学者 我的应用程序通过JSON从我的WebAPI获取客户名称 现在我正试图将其加载到一个微调器中,但如何在其中加载JSON arraylist呢 我尝试在其中加载custable,但现在微调器中显示“com.jetron.jetronbuitendianst.CustomerDetailsTable…” 我的代码:Java 将数据从JSON ArrayList加载到微调器,java,android,json,arraylist,android-spinner,Java,Android,Json,Arraylist,Android Spinner,我似乎不明白这一点,因为我只是一个android的初学者 我的应用程序通过JSON从我的WebAPI获取客户名称 现在我正试图将其加载到一个微调器中,但如何在其中加载JSON arraylist呢 我尝试在其中加载custable,但现在微调器中显示“com.jetron.jetronbuitendianst.CustomerDetailsTable…” 我的代码: package com.jetron.jetronbuitendienst; import android.annotati
package com.jetron.jetronbuitendienst;
import android.annotation.TargetApi;
import android.os.AsyncTask;
import android.os.Build;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import org.json.JSONArray;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
public class Gegevens extends Main {
String Naam;
Spinner spCustomers;
private ArrayList<CustomerDetailsTable> Klanten;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_gegevens);
new AsyncLoadCustDetails().execute();
spCustomers = (Spinner) findViewById(R.id.spKlanten);
}
/**
* Set up the {@link android.app.ActionBar}, if the API is available.
*/
protected class AsyncLoadCustDetails extends
AsyncTask<Void, JSONObject, ArrayList<CustomerDetailsTable>> {
ArrayList<CustomerDetailsTable> custTable = null;
@Override
protected ArrayList<CustomerDetailsTable> doInBackground(Void... params) {
// TODO Auto-generated method stub
RestAPI api = new RestAPI();
try {
JSONObject jsonObj = api.GetCustomerDetails();
JSONParser parser = new JSONParser();
custTable = parser.parseCustomerDetails(jsonObj);
Log.d("Customers: ", jsonObj.toString());
} catch (Exception e) {
// TODO Auto-generated catch block
Log.d("AsyncLoadCustDetails", e.getMessage());
}
return custTable;
}
@Override
protected void onPostExecute(ArrayList<CustomerDetailsTable> result) {
// TODO Auto-generated method stub
// Application of the Array to the Spinner
ArrayAdapter<CustomerDetailsTable> spinnerArrayAdapter = new ArrayAdapter<CustomerDetailsTable>(getApplicationContext(), android.R.layout.simple_spinner_item, custTable);
spinnerArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); // The drop down view
spCustomers.setAdapter(spinnerArrayAdapter);
}
}
}
package com.jetron.jetronbuitendianst;
导入android.annotation.TargetApi;
导入android.os.AsyncTask;
导入android.os.Build;
导入android.support.v7.app.AppActivity;
导入android.os.Bundle;
导入android.util.Log;
导入android.widget.ArrayAdapter;
导入android.widget.Spinner;
导入org.json.JSONArray;
导入org.json.JSONObject;
导入java.util.ArrayList;
导入java.util.List;
公共类Gegevens扩展了Main{
字符串Naam;
纺纱机;
私人律师克拉滕;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_gevens);
新建AsyncLoadCustDetails().execute();
spCustomers=(微调器)findviewbyd(R.id.spKlanten);
}
/**
*如果API可用,请设置{@link android.app.ActionBar}。
*/
受保护的类AsyncLoadCustDetails扩展
异步任务{
ArrayList custTable=null;
@凌驾
受保护的ArrayList doInBackground(无效…参数){
//TODO自动生成的方法存根
RestAPI api=new RestAPI();
试一试{
JSONObject jsonObj=api.GetCustomerDetails();
JSONParser=新的JSONParser();
custable=parser.parseCustomerDetails(jsonObj);
Log.d(“客户:,jsonObj.toString());
}捕获(例外e){
//TODO自动生成的捕捉块
d(“AsyncLoadCustDetails”,e.getMessage());
}
返回客户表;
}
@凌驾
受保护的void onPostExecute(ArrayList结果){
//TODO自动生成的方法存根
//阵列在旋转器中的应用
ArrayAdapter spinnerArrayAdapter=新的ArrayAdapter(getApplicationContext(),android.R.layout.simple\u spinner\u项,custTable);
spinnerrayadapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);//下拉视图
spCustomers.setAdapter(spinnerrayadapter);
}
}
}
这是jsonObj:D/Customers::{“Successful”:true,“Value”:[{“Naam”:“Google”},{“Naam”:“Apple”},{“Naam”:“AVN”},{“Naam”:“Bemd”}]}
对我有效
class LoadAlbums extends AsyncTask<String, String, ArrayList<HashMap<String,String>>> {
ArrayAdapter<String> adaptercountry ;
@Override
protected void onPreExecute() {
super.onPreExecute();
}
protected ArrayList<HashMap<String,String>> doInBackground(String... args) {
ServiceHandler sh = new ServiceHandler();
// Making a request to url and getting response
data = new ArrayList<HashMap<String, String>>();
String jsonStr = sh.makeServiceCall(COUNTRY_URL, ServiceHandler.GET);
Log.d("Response: ", "> " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node your array
country_list = jsonObj.getJSONArray(COUNTRY_LIST);
// looping through All Contacts
for (int i = 0; i < country_list.length(); i++) {
JSONObject c = country_list.getJSONObject(i);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(OP_ID, c.getString(OP_ID));
map.put(OP_NAME,c.getString(OP_NAME));
data.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
return data;
}
protected void onPostExecute(ArrayList<HashMap<String,String>> result) {
super.onPostExecute(result);
String[] arrConuntry=new String[data.size()];
for(int index=0;index<data.size();index++){
HashMap<String, String> map=data.get(index);
arrConuntry[index]=map.get(OP_NAME);
}
// pass arrConuntry array to ArrayAdapter<String> constroctor :
adaptercountry = new ArrayAdapter<String>(getActivity(),
android.R.layout.simple_spinner_dropdown_item,
arrConuntry);
spcountry.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View w) {
new AlertDialog.Builder(getActivity())
.setTitle("Select")
.setAdapter(adaptercountry, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
spcountry.setText(adaptercountry.getItem(which).toString());
try {
cname=country_list.getJSONObject(which).getString("operator_id");
Log.d("Response: ", "> " + cname);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
dialog.dismiss();
}
}).create().show();
}
});
}
类装入相册扩展异步任务{
阵列适配器国家/地区;
@凌驾
受保护的void onPreExecute(){
super.onPreExecute();
}
受保护的ArrayList doInBackground(字符串…args){
ServiceHandler sh=新的ServiceHandler();
//向url发出请求并获得响应
数据=新的ArrayList();
字符串jsonStr=sh.makeServiceCall(国家/地区URL,ServiceHandler.GET);
Log.d(“响应:”、“>”+jsonStr);
if(jsonStr!=null){
试一试{
JSONObject jsonObj=新的JSONObject(jsonStr);
//从数组中获取JSON数组节点
country_list=jsonObj.getJSONArray(country_list);
//通过所有触点循环
对于(int i=0;ivalue
map.put(OP_ID,c.getString(OP_ID));
map.put(OP_名称,c.getString(OP_名称));
数据。添加(地图);
}
}捕获(JSONException e){
e、 printStackTrace();
}
}否则{
Log.e(“ServiceHandler”,“无法从url获取任何数据”);
}
返回数据;
}
受保护的void onPostExecute(ArrayList结果){
super.onPostExecute(结果);
String[]arrconcountry=新字符串[data.size()];
对于(int index=0;index检查API参考
ArrayAdapter使用Object.toString()填充视图
在代码中,使用对象CustomerDetailsTable不会重写toString()函数,因此它只打印类的名称。既然您得到了这样的结果:
D/Customers:: {"Successful":true,"Value":[{"Naam":"Google"},{"Naam":"Apple"},{"Naam":"AVN"},{"Naam":"Bemd"}]}
这意味着您拥有一个名为Value的数组。因此,您可以执行以下操作:
声明公共变量:
private JSONObject jsonChildNode;
private JSONArray jsonMainNode;
private String name;
然后将代码修改为:
try {
JSONObject jsonObj = api.GetCustomerDetails();
JSONParser parser = new JSONParser();
custTable = parser.parseCustomerDetails(jsonObj);
Log.d("Customers: ", jsonObj.toString());
jsonMainNode = jsonObj.optJSONArray("Value");
for (int i = 0; i < jsonMainNode.length(); i++) {
jsonChildNode = jsonMainNode.getJSONObject(i);
name = jsonChildNode.optString("Naam");
}
//and then you can add the name to a List<String> which will contain all the values of each item in the Value JSON Array.
} catch (Exception e) {
// TODO Auto-generated catch block
Log.d("AsyncLoadCustDetails", e.getMessage());
}
试试看{
JSONObject jsonObj=api.GetCustomerDetails();
JSONParser=新的JSONParser();
custable=parser.parseCustomerDetails(jsonObj);
Log.d(“客户:,jsonObj.toString());
jsonMainNode=jsonObj.optJSONArray(“值”);
for(int i=0;i
希望能有帮助