个人中心
文章发布
退出
作者热门文章
- android - 多次调用 OnPrimaryClipChangedListener
- android - 无法更新 RecyclerView 中的 TextView 字段
- android.database.CursorIndexOutOfBoundsException : Index 0 requested, 光标大小为 0
- android - 使用 AppCompat 时，我们是否需要明确指定其 UI 组件(Spinner、EditText)颜色
26
4
我试图通过 ParseQuerys 类中的方法调用 AsyncTask，以在我的 Fragment lvRestaurantFrag 的 ListView 中使用该信息。问题是该方法返回 null，因为 AsyncTask 未到达 onPostExecute。我不知道如何解决它。
在这里我留下我的代码:
[
{
"idBranchRestaurant":1,
"idRestaurant":1,
"restaurant":{
"idRestaurant":1,
"name":"Don Julio",
"description":"La mejor parrilla para cualquier turista",
"socialNetwork":[
{
"idSocialNetworkRestaurant":1,
"idRestaurant":1,
"idTypeSocialNetwork":1,
"value":"www.donjulio.com.ar",
"type":{
"idTypeSocialNetwork":1,
"name":"Website",
"icon":"website_ic.jpg"
}
}
]
},
"idRangePriceBranch":1,
"RangePrice":{
"idRangePriceBranch":1,
"idBranchRestaurant":1,
"minimum":300,
"maximum":600
},
"name":"Paraguay",
"photo":[
{
"idBranchPhoto":4,
"idBranchRestaurant":1,
"branch":null,
"idUser":0,
"user":null,
"photo":"entradaDonJulio.jpg"
}
],
"cuisine":[
{
"idCousine":1,
"name":"Parrilla"
}
],
"menu":[
{
"idTypeMenu":1,
"name":"Mediodia",
"idBranchRestaurant":1,
"plates":null
},
{
"idTypeMenu":2,
"name":"Noche",
"idBranchRestaurant":1,
"plates":null
}
],
"filter":[
{
"idTypeFilter":2,
"name":"Family",
"icon":"family_ic.jpg"
}
],
"service":[
{
"idService":2,
"name":"Comida para celiacos"
},
{
"idService":1,
"name":"Wifi"
}
],
"timetable":[
{
"idTimetableBranch":11,
"idBranchRestaurant":1,
"idDay":2,
"openingHour":"19 hs",
"closingHour":"24 hs",
"day":{
"idDay":2,
"name":"Tuesday"
}
},
{
"idTimetableBranch":10,
"idBranchRestaurant":1,
"idDay":2,
"openingHour":"12 hs",
"closingHour":"16 hs",
"day":{
"idDay":2,
"name":"Tuesday"
}
},
{
"idTimetableBranch":9,
"idBranchRestaurant":1,
"idDay":1,
"openingHour":"19 hs",
"closingHour":"24 hs",
"day":{
"idDay":1,
"name":"Monday"
}
},
{
"idTimetableBranch":8,
"idBranchRestaurant":1,
"idDay":1,
"openingHour":"12 hs ",
"closingHour":"16 hs",
"day":{
"idDay":1,
"name":"Monday"
}
},
{
"idTimetableBranch":12,
"idBranchRestaurant":1,
"idDay":3,
"openingHour":"12 hs",
"closingHour":"16 hs",
"day":{
"idDay":3,
"name":"Wednesday"
}
},
{
"idTimetableBranch":13,
"idBranchRestaurant":1,
"idDay":3,
"openingHour":"19 hs ",
"closingHour":"24 hs",
"day":{
"idDay":3,
"name":"Wednesday"
}
},
{
"idTimetableBranch":14,
"idBranchRestaurant":1,
"idDay":4,
"openingHour":"12 hs",
"closingHour":"16 hs",
"day":{
"idDay":4,
"name":"Thursday"
}
},
{
"idTimetableBranch":15,
"idBranchRestaurant":1,
"idDay":4,
"openingHour":"19 hs",
"closingHour":"24 hs",
"day":{
"idDay":4,
"name":"Thursday"
}
},
{
"idTimetableBranch":16,
"idBranchRestaurant":1,
"idDay":5,
"openingHour":"12 hs",
"closingHour":"16 hs ",
"day":{
"idDay":5,
"name":"Friday"
}
},
{
"idTimetableBranch":17,
"idBranchRestaurant":1,
"idDay":5,
"openingHour":"19 hs ",
"closingHour":"2 hs",
"day":{
"idDay":5,
"name":"Friday"
}
}
],
"latitude":"87654322",
"longitude":"23456789",
"calification":null,
"averageFood":4.0,
"averageService":4.0,
"averageAmbience":4.0,
"averageCalification":4.0,
"promotion":[
{
"idPromotion":3,
"idTypePromotion":2,
"code":"DIADELPADRE",
"name":"Dia Del Padre Regalo",
"startDate":"2017-06-26T00:00:00",
"expireDate":"2017-06-18T00:00:00",
"description":"postre de regalo",
"value":100,
"type":{
"idTypePromotion":2,
"name":"Gift"
}
}
]
},
{
"idBranchRestaurant":2,
"idRestaurant":2,
"restaurant":{
"idRestaurant":2,
"name":"La Hormiga",
"description":"el lugar explota de gente y en especial de gente de ort",
"socialNetwork":[
{
"idSocialNetworkRestaurant":2,
"idRestaurant":2,
"idTypeSocialNetwork":2,
"value":"www.facebook.com/LaHormiga",
"type":{
"idTypeSocialNetwork":2,
"name":"Facebook",
"icon":"fb_ic.jpg"
}
}
]
},
"idRangePriceBranch":1,
"RangePrice":{
"idRangePriceBranch":1,
"idBranchRestaurant":1,
"minimum":300,
"maximum":600
},
"name":"Ort",
"photo":[
{
"idBranchPhoto":5,
"idBranchRestaurant":2,
"branch":null,
"idUser":0,
"user":null,
"photo":"entradaLaHormiga.jpg"
}
],
"cuisine":[
{
"idCousine":2,
"name":"Pizza"
}
],
"menu":[
{
"idTypeMenu":3,
"name":"Mediodia",
"idBranchRestaurant":2,
"plates":null
}
],
"filter":[
{
"idTypeFilter":1,
"name":"With Discount",
"icon":"discount_ic.jpg"
}
],
"service":[
{
"idService":3,
"name":"Aire acondicionado"
},
{
"idService":1,
"name":"Wifi"
}
],
"timetable":[
{
"idTimetableBranch":18,
"idBranchRestaurant":2,
"idDay":6,
"openingHour":"11 hs",
"closingHour":"15 hs",
"day":{
"idDay":6,
"name":"Saturday"
}
},
{
"idTimetableBranch":19,
"idBranchRestaurant":2,
"idDay":7,
"openingHour":"11 hs",
"closingHour":"15 hs",
"day":{
"idDay":7,
"name":"Sunday"
}
}
],
"latitude":"234567897",
"longitude":"123456789",
"calification":null,
"averageFood":5.0,
"averageService":5.0,
"averageAmbience":5.0,
"averageCalification":5.0,
"promotion":[
]
},
{
"idBranchRestaurant":3,
"idRestaurant":3,
"restaurant":{
"idRestaurant":3,
"name":"paja rota",
"description":"La mejor parrilla de ramos mejia",
"socialNetwork":[
{
"idSocialNetworkRestaurant":3,
"idRestaurant":3,
"idTypeSocialNetwork":3,
"value":"twitter.com/Pajarota",
"type":{
"idTypeSocialNetwork":3,
"name":"Twitter",
"icon":"ic_twitter.png"
}
}
]
},
"idRangePriceBranch":3,
"RangePrice":{
"idRangePriceBranch":3,
"idBranchRestaurant":3,
"minimum":50,
"maximum":250
},
"name":"Ramos MEjia",
"photo":[
{
"idBranchPhoto":6,
"idBranchRestaurant":3,
"branch":null,
"idUser":0,
"user":null,
"photo":"EntradaPajaRota.jpg"
}
],
"cuisine":[
{
"idCousine":1,
"name":"Parrilla"
}
],
"menu":[
{
"idTypeMenu":4,
"name":"Mediodia",
"idBranchRestaurant":3,
"plates":null
},
{
"idTypeMenu":5,
"name":"Noche",
"idBranchRestaurant":3,
"plates":null
}
],
"filter":[
{
"idTypeFilter":2,
"name":"Family",
"icon":"family_ic.jpg"
}
],
"service":[
{
"idService":1,
"name":"Wifi"
},
{
"idService":4,
"name":"Carta de braille"
}
],
"timetable":[
{
"idTimetableBranch":20,
"idBranchRestaurant":3,
"idDay":5,
"openingHour":"12 hs",
"closingHour":"16 hs",
"day":{
"idDay":5,
"name":"Friday"
}
},
{
"idTimetableBranch":21,
"idBranchRestaurant":3,
"idDay":5,
"openingHour":"19 hs",
"closingHour":"2 hs",
"day":{
"idDay":5,
"name":"Friday"
}
},
{
"idTimetableBranch":22,
"idBranchRestaurant":3,
"idDay":6,
"openingHour":"12 hs",
"closingHour":"16 hs",
"day":{
"idDay":6,
"name":"Saturday"
}
},
{
"idTimetableBranch":23,
"idBranchRestaurant":3,
"idDay":6,
"openingHour":"19 hs",
"closingHour":"2 hs",
"day":{
"idDay":6,
"name":"Saturday"
}
},
{
"idTimetableBranch":24,
"idBranchRestaurant":3,
"idDay":7,
"openingHour":"12 hs",
"closingHour":"16 hs",
"day":{
"idDay":7,
"name":"Sunday"
}
}
],
"latitude":"12345678",
"longitude":"87654321",
"calification":null,
"averageFood":5.0,
"averageService":5.0,
"averageAmbience":5.0,
"averageCalification":5.0,
"promotion":[
]
},
{
"idBranchRestaurant":4,
"idRestaurant":4,
"restaurant":{
"idRestaurant":4,
"name":"la espiga",
"description":"el mejor lugar para comer pastas",
"socialNetwork":[
{
"idSocialNetworkRestaurant":4,
"idRestaurant":4,
"idTypeSocialNetwork":4,
"value":"instagram.com/laespiga",
"type":{
"idTypeSocialNetwork":4,
"name":"Instagram",
"icon":"ic_Instagram.png"
}
}
]
},
"idRangePriceBranch":4,
"RangePrice":{
"idRangePriceBranch":4,
"idBranchRestaurant":4,
"minimum":80,
"maximum":150
},
"name":"Almagro",
"photo":[
{
"idBranchPhoto":7,
"idBranchRestaurant":4,
"branch":null,
"idUser":0,
"user":null,
"photo":"EntradaLaEspiga.jpg"
}
],
"cuisine":[
{
"idCousine":4,
"name":"Pasta"
}
],
"menu":[
{
"idTypeMenu":6,
"name":"Tarde",
"idBranchRestaurant":4,
"plates":null
}
],
"filter":[
{
"idTypeFilter":1,
"name":"With Discount",
"icon":"discount_ic.jpg"
}
],
"service":[
{
"idService":1,
"name":"Wifi"
},
{
"idService":3,
"name":"Aire acondicionado"
}
],
"timetable":[
{
"idTimetableBranch":26,
"idBranchRestaurant":4,
"idDay":1,
"openingHour":"16 hs",
"closingHour":"19 hs",
"day":{
"idDay":1,
"name":"Monday"
}
},
{
"idTimetableBranch":27,
"idBranchRestaurant":4,
"idDay":2,
"openingHour":"16 hs",
"closingHour":"19 hs",
"day":{
"idDay":2,
"name":"Tuesday"
}
},
{
"idTimetableBranch":28,
"idBranchRestaurant":4,
"idDay":3,
"openingHour":"16 hs",
"closingHour":"19 hs",
"day":{
"idDay":3,
"name":"Wednesday"
}
},
{
"idTimetableBranch":29,
"idBranchRestaurant":4,
"idDay":4,
"openingHour":"16 hs",
"closingHour":"19 hs",
"day":{
"idDay":4,
"name":"Thursday"
}
},
{
"idTimetableBranch":30,
"idBranchRestaurant":4,
"idDay":5,
"openingHour":"16 hs",
"closingHour":"19 hs",
"day":{
"idDay":5,
"name":"Friday"
}
}
],
"latitude":"87657467",
"longitude":"45254567",
"calification":null,
"averageFood":5.0,
"averageService":5.0,
"averageAmbience":5.0,
"averageCalification":5.0,
"promotion":[
]
}
]
private String server = "http://appmorfando.azurewebsites.net/api/";
ParsingObjects parse = new ParsingObjects();
// Query for List Branches
private ArrayList<Branch> branches = new ArrayList<Branch>();
public ArrayList<Branch> getAllBranch(int limit, int offset){
new BranchGetAll().execute("branch/", limit + "", offset + "");
return branches;
}
private class BranchGetAll extends AsyncTask<String, Void, ArrayList<Branch>> {
protected void onPostExecute(ArrayList<Branch> datos) {
super.onPostExecute(datos);
branches = datos;
}
@Override
protected ArrayList<Branch> doInBackground(String... parametros) {
String url = parametros[0] + parametros[1] + "/" + parametros[2];
ArrayList<Branch> branchList = new ArrayList<Branch>();
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url(server + url)
.build();
String resultado;
try {
Response response = client.newCall(request).execute(); // Llamo al API Rest servicio1 en ejemplo.com
resultado = response.body().string();
} catch (IOException e) {
Log.d("Error",e.getMessage()); // Error de Network
return null;
}
try{
JSONArray jsonBranch = new JSONArray(resultado);
for (int i = 0; i < jsonBranch.length(); i++){
Branch b = new Branch();
JSONObject obj = jsonBranch.getJSONObject(i);
b = parse.branch(obj);
//Restaurant
JSONObject restoObj = obj.getJSONObject("restaurant");
b.restaurant = parse.restaurant(restoObj);
//Social Network
JSONArray socialNetwork = restoObj.getJSONArray("socialNetwork");
b.restaurant.social = parse.socialNetwork(socialNetwork);
// Range Price
JSONObject rangeObj = obj.getJSONObject("RangePrice");
b.range = parse.rangePrice(rangeObj);
//Photos
JSONArray photo = obj.getJSONArray("photo");
b.photo = parse.photoBranch(photo);
// Cuisine
JSONArray cuisine = obj.getJSONArray("cuisine");
b.cuisine = parse.cuisine(cuisine);
//Menu
JSONArray menu = obj.getJSONArray("menu");
b.menu = parse.menu(menu);
//Filter
JSONArray filter = obj.getJSONArray("filter");
b.filter = parse.filter(filter);
//Service
JSONArray service = obj.getJSONArray("service");
b.service = parse.service(service);
//Timetable
JSONArray timetable = obj.getJSONArray("timetable");
b.timetable = parse.timetable(timetable);
//Promotion
JSONArray promotion = obj.getJSONArray("promotion");
b.promotion = parse.promotion(promotion);
branchList.add(b);
}
return branchList;
}
catch (JSONException e) {
Log.d("error", e.getMessage());
return null;
}
}
}
public class lvRestaurantFrag extends Fragment implements AdapterView.OnItemClickListener{
MainActivity main;
ListView restaurantItems;
lvRestaurantAdapter adapter;
ParseQuery pq;
ArrayList<Branch> listBranches;
public View onCreateView(LayoutInflater inflater, ViewGroup group, Bundle data) {
View toReturn;
toReturn = inflater.inflate(R.layout.frag_restaurant_lv, group, false);
main = (MainActivity)getActivity();
pq = new ParseQuery();
restaurantItems = (ListView) toReturn.findViewById(R.id.lvRestaurantItems);
// Here gets null so the adapter size is 0
listBranches = pq.getAllBranch(10,0);
adapter = new lvRestaurantAdapter(listBranches, main);
restaurantItems.setAdapter(adapter);
restaurantItems.setOnItemClickListener(this);
return toReturn;
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
int idBranch = adapter.getId(position);
main.BranchSelected(idBranch);
}
}
最佳答案
这里有两件事:
你怎么知道你的异步任务没有到达onpostexecute？您附加的代码不会覆盖 onpostexecute。让我们尝试实现该方法并执行一个简单的 logcat 或 system.out 来确认。
您的异步任务正在从服务器获取 Json 对象并将它们打包到要返回的列表中。有很多方法会导致此失败，例如服务器连接错误或 json 解析不正确。我会仔细测试您的连接和数据结构，以确保 null 是 asynctask 导致的。
最简单的测试方法之一是注释掉所有连接和 json 相关代码，然后返回一个您知道有效的手动填充列表。这将有助于隔离出现故障的区域。
关于java - 从其他类调用 AsyncTack 并返回 null Android Studio，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45538107/
26
4
0
我正在编写一个具有以下签名的 Java 方法。 void Logger(Method method, Object[] args); 如果一个方法(例如 ABC() )调用此方法 Logger，它应该
我是 Java 新手。 我的问题是我的 Java 程序找不到我试图用作的图像文件一个 JButton。 (目前这段代码什么也没做，因为我只是得到了想要的外观第一的)。这是我的主课 代码: packag
好的，今天我在接受采访，我已经编写 Java 代码多年了。采访中说“Java 垃圾收集是一个棘手的问题，我有几个 friend 一直在努力弄清楚。你在这方面做得怎么样？”。她是想骗我吗？还是我的一生都
我的 friend 给了我一个谜语让我解开。它是这样的: There are 100 people. Each one of them, in his turn, does the following
如果我将使用 Java 5 代码的应用程序编译成字节码，生成的 .class 文件是否能够在 Java 1.4 下运行？ 如果后者可以工作并且我正在尝试在我的 Java 1.4 应用程序中使用 Jav
有关于why Java doesn't support unsigned types的问题以及一些关于处理无符号类型的问题。我做了一些搜索，似乎 Scala 也不支持无符号数据类型。限制是Java和S
我只是想知道在一个 java 版本中生成的字节码是否可以在其他 java 版本上运行 最佳答案 通常，字节码无需修改即可在 较新 版本的 Java 上运行。它不会在旧版本上运行，除非您使用特殊参数 (
我有一个关于在命令提示符下执行 java 程序的基本问题。 在某些机器上我们需要指定 -cp 。 (类路径)同时执行java程序 (test为java文件名与.class文件存在于同一目录下) jav
我已经阅读 StackOverflow 有一段时间了，现在我才鼓起勇气提出问题。我今年 20 岁，目前在我的家乡(罗马尼亚克卢日-纳波卡)就读 IT 大学。足以介绍:D。 基本上，我有一家提供簿记应用
我有 public JSONObject parseXML(String xml) { JSONObject jsonObject = XML.toJSONObject(xml); r
我已经在 Java 中实现了带有动态类型的简单解释语言。不幸的是我遇到了以下问题。测试时如下代码: def main() { def ks = Map[[1, 2]].keySet()
一直提示输入 1 到 10 的数字 - 结果应将 st、rd、th 和 nd 添加到数字中。编写一个程序，提示用户输入 1 到 10 之间的任意整数，然后以序数形式显示该整数并附加后缀。 public
我有这个 DownloadFile.java 并按预期下载该文件: import java.io.*; import java.net.URL; public class DownloadFile {
我想在 GUI 上添加延迟。我放置了 2 个 for 循环，然后重新绘制了一个标签，但这 2 个 for 循环一个接一个地执行，并且标签被重新绘制到最后一个。 我能做什么？ for(int i=0;
我正在对对象 Student 的列表项进行一些测试，但是我更喜欢在 java 类对象中创建硬编码列表，然后从那里提取数据，而不是连接到数据库并在结果集中选择记录。然而，自从我这样做以来已经很长时间了，
我知道对象创建分为三个部分: 声明 实例化 初始化 classA{} classB extends classA{} classA obj = new classB(1,1); 实例化 它必须使用
我有兴趣使用 GPRS 构建车辆跟踪系统。但是，我有一些问题要问以前做过此操作的人: GPRS 是最好的技术吗？人们意识到任何问题吗？ 我计划使用 Java/Java EE - 有更好的技术吗？ 如果
我可以通过递归方法反转数组，例如:数组={1,2,3,4,5} 数组结果={5,4,3,2,1}但我的结果是相同的数组，我不知道为什么，请帮助我。 public class Recursion { p
有这样的标准方式吗？ 包括 Java源代码-测试代码- Ant 或 Maven联合单元持续集成(可能是巡航控制)ClearCase 版本控制工具部署到应用服务器 最后我希望有一个自动构建和集成环境。
我什至不知道这是否可能，我非常怀疑它是否可能，但如果可以，您能告诉我怎么做吗？我只是想知道如何从打印机打印一些文本。 有什么想法吗？ 最佳答案 这里有更简单的事情。 import javax.swin
我是一名优秀的程序员,十分优秀！