JSON Android和Listview
我正在寻找一个在Android中将JSON解析为Listview的好教程 问题是我的JSON文件是这样的JSON Android和Listview,android,json,listview,android-activity,Android,Json,Listview,Android Activity,我正在寻找一个在Android中将JSON解析为Listview的好教程 问题是我的JSON文件是这样的 [{"location_id":"823","company_id":"41","name":"Milj\u00f8station","address":"Aldersro \/ Aldersro 8","place":"","postal":"5700","city":"Svendborg","monday":"","tuesday":"","wednesday":"","thursday
[{"location_id":"823","company_id":"41","name":"Milj\u00f8station","address":"Aldersro \/ Aldersro 8","place":"","postal":"5700","city":"Svendborg","monday":"","tuesday":"","wednesday":"","thursday":"","friday":"","saturday":"","sunday":"","type":"2","lat":"55.061426149085","lng":"10.5927246809006","nocar":"0","distance":"0.00023254303859579"}]
public class SingleMenuItemActivity extends Activity {
// JSON node keys
private static final String TAG_NAME = "name";
private static final String TAG_EMAIL = "email";
private static final String TAG_PHONE_MOBILE = "mobile";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.single_list_item);
// getting intent data
Intent in = getIntent();
// Get JSON values from previous intent
String name = in.getStringExtra(TAG_NAME);
String cost = in.getStringExtra(TAG_EMAIL);
String description = in.getStringExtra(TAG_PHONE_MOBILE);
// Displaying all values on the screen
TextView lblName = (TextView) findViewById(R.id.name_label);
TextView lblCost = (TextView) findViewById(R.id.email_label);
TextView lblDesc = (TextView) findViewById(R.id.mobile_label);
lblName.setText(name);
lblCost.setText(cost);
lblDesc.setText(description);
} }
public class AndroidJSONParsingActivity extends ListActivity {
// url to make request
private static String url = "http://webservice.xxx.com/webservice/getLocationList.php?lat=55.061424255371094&lng=10.592724800109863";
// JSON Node names
private static final String TAG_Location = "location_id";
private static final String TAG_Company = "company_id";
private static final String TAG_NAME = "name";
private static final String TAG_ADDRESS = "address";
private static final String TAG_PLACE = "place";
private static final String TAG_POSTAL = "postal";
private static final String TAG_CITY = "city";
private static final String TAG_MONDAY = "monday";
private static final String TAG_TUESDAY = "tuesday";
private static final String TAG_WEDNESDAY = "wednesday";
private static final String TAG_THURSDAY = "thursday";
private static final String TAG_FRIDAY = "friday";
private static final String TAG_SATURDAY = "saturday";
private static final String TAG_SUNDAY = "sunday";
private static final String TAG_TYPE = "type";
private static final String TAG_LAT = "lat";
private static final String TAG_LNG = "lng";
private static final String TAG_NOCAR = "nocar";
// contacts JSONArray
JSONArray contacts = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Hashmap for ListView
ArrayList<HashMap<String, String>> contactList = new ArrayList<HashMap<String, String>>();
// Creating JSON Parser instance
JSONParser jParser = new JSONParser();
// getting JSON string from URL
JSONObject json = jParser.getJSONFromUrl(url);
try {
// looping through All Contacts
for(int i = 0; i < contacts.length(); i++){
JSONObject c = contacts.getJSONObject(i);
// Storing each json item in variable
String location_id = c.getString(TAG_Location);
String company_id = c.getString(TAG_Company);
String name = c.getString(TAG_NAME);
String address = c.getString(TAG_ADDRESS);
String place = c.getString(TAG_PLACE);
String postal = c.getString(TAG_POSTAL);
String city = c.getString(TAG_CITY);
String monday = c.getString(TAG_MONDAY);
String tuesday = c.getString(TAG_TUESDAY);
String wednesday = c.getString(TAG_WEDNESDAY);
String thursday = c.getString(TAG_THURSDAY);
String friday = c.getString(TAG_FRIDAY);
String saturday = c.getString(TAG_SATURDAY);
String sunday = c.getString(TAG_SUNDAY);
String type = c.getString(TAG_TYPE);
String lat = c.getString(TAG_LAT);
String lng = c.getString(TAG_LNG);
String nocar = c.getString(TAG_NOCAR);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_Location, location_id);
map.put(TAG_Company, company_id);
map.put(TAG_NAME, name);
map.put(TAG_ADDRESS, address);
map.put(TAG_PLACE, place);
map.put(TAG_POSTAL, postal);
map.put(TAG_CITY, city);
map.put(TAG_MONDAY, monday);
map.put(TAG_TUESDAY, tuesday);
map.put(TAG_WEDNESDAY, wednesday);
map.put(TAG_THURSDAY, thursday);
map.put(TAG_FRIDAY, friday);
map.put(TAG_SATURDAY, saturday);
map.put(TAG_SUNDAY, sunday);
map.put(TAG_TYPE, type);
map.put(TAG_LAT, lat);
map.put(TAG_LNG, lng);
map.put(TAG_NOCAR, nocar);
// adding HashList to ArrayList
contactList.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(this, contactList,
R.layout.list_item,
new String[] { TAG_NAME, TAG_LAT, TAG_Company }, new int[] {
R.id.name, R.id.email, R.id.mobile });
setListAdapter(adapter);
// selecting single ListView item
ListView lv = getListView();
// Launching new screen on Selecting Single ListItem
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
String name = ((TextView) view.findViewById(R.id.name)).getText().toString();
String cost = ((TextView) view.findViewById(R.id.email)).getText().toString();
String description = ((TextView) view.findViewById(R.id.mobile)).getText().toString();
// Starting new intent
Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class);
in.putExtra(TAG_NAME, name);
in.putExtra(TAG_Location, cost);
in.putExtra(TAG_Company, description);
startActivity(in);
}
});
} }
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
public JSONObject getJSONFromUrl(String url) {
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
} }
public class SingleMenuItemActivity extends Activity {
// JSON node keys
private static final String TAG_NAME = "name";
private static final String TAG_EMAIL = "email";
private static final String TAG_PHONE_MOBILE = "mobile";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.single_list_item);
// getting intent data
Intent in = getIntent();
// Get JSON values from previous intent
String name = in.getStringExtra(TAG_NAME);
String cost = in.getStringExtra(TAG_EMAIL);
String description = in.getStringExtra(TAG_PHONE_MOBILE);
// Displaying all values on the screen
TextView lblName = (TextView) findViewById(R.id.name_label);
TextView lblCost = (TextView) findViewById(R.id.email_label);
TextView lblDesc = (TextView) findViewById(R.id.mobile_label);
lblName.setText(name);
lblCost.setText(cost);
lblDesc.setText(description);
} }
public class AndroidJSONParsingActivity extends ListActivity {
// url to make request
private static String url = "http://webservice.xxx.com/webservice/getLocationList.php?lat=55.061424255371094&lng=10.592724800109863";
// JSON Node names
private static final String TAG_Location = "location_id";
private static final String TAG_Company = "company_id";
private static final String TAG_NAME = "name";
private static final String TAG_ADDRESS = "address";
private static final String TAG_PLACE = "place";
private static final String TAG_POSTAL = "postal";
private static final String TAG_CITY = "city";
private static final String TAG_MONDAY = "monday";
private static final String TAG_TUESDAY = "tuesday";
private static final String TAG_WEDNESDAY = "wednesday";
private static final String TAG_THURSDAY = "thursday";
private static final String TAG_FRIDAY = "friday";
private static final String TAG_SATURDAY = "saturday";
private static final String TAG_SUNDAY = "sunday";
private static final String TAG_TYPE = "type";
private static final String TAG_LAT = "lat";
private static final String TAG_LNG = "lng";
private static final String TAG_NOCAR = "nocar";
// contacts JSONArray
JSONArray contacts = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Hashmap for ListView
ArrayList<HashMap<String, String>> contactList = new ArrayList<HashMap<String, String>>();
// Creating JSON Parser instance
JSONParser jParser = new JSONParser();
// getting JSON string from URL
JSONObject json = jParser.getJSONFromUrl(url);
try {
// looping through All Contacts
for(int i = 0; i < contacts.length(); i++){
JSONObject c = contacts.getJSONObject(i);
// Storing each json item in variable
String location_id = c.getString(TAG_Location);
String company_id = c.getString(TAG_Company);
String name = c.getString(TAG_NAME);
String address = c.getString(TAG_ADDRESS);
String place = c.getString(TAG_PLACE);
String postal = c.getString(TAG_POSTAL);
String city = c.getString(TAG_CITY);
String monday = c.getString(TAG_MONDAY);
String tuesday = c.getString(TAG_TUESDAY);
String wednesday = c.getString(TAG_WEDNESDAY);
String thursday = c.getString(TAG_THURSDAY);
String friday = c.getString(TAG_FRIDAY);
String saturday = c.getString(TAG_SATURDAY);
String sunday = c.getString(TAG_SUNDAY);
String type = c.getString(TAG_TYPE);
String lat = c.getString(TAG_LAT);
String lng = c.getString(TAG_LNG);
String nocar = c.getString(TAG_NOCAR);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_Location, location_id);
map.put(TAG_Company, company_id);
map.put(TAG_NAME, name);
map.put(TAG_ADDRESS, address);
map.put(TAG_PLACE, place);
map.put(TAG_POSTAL, postal);
map.put(TAG_CITY, city);
map.put(TAG_MONDAY, monday);
map.put(TAG_TUESDAY, tuesday);
map.put(TAG_WEDNESDAY, wednesday);
map.put(TAG_THURSDAY, thursday);
map.put(TAG_FRIDAY, friday);
map.put(TAG_SATURDAY, saturday);
map.put(TAG_SUNDAY, sunday);
map.put(TAG_TYPE, type);
map.put(TAG_LAT, lat);
map.put(TAG_LNG, lng);
map.put(TAG_NOCAR, nocar);
// adding HashList to ArrayList
contactList.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(this, contactList,
R.layout.list_item,
new String[] { TAG_NAME, TAG_LAT, TAG_Company }, new int[] {
R.id.name, R.id.email, R.id.mobile });
setListAdapter(adapter);
// selecting single ListView item
ListView lv = getListView();
// Launching new screen on Selecting Single ListItem
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
String name = ((TextView) view.findViewById(R.id.name)).getText().toString();
String cost = ((TextView) view.findViewById(R.id.email)).getText().toString();
String description = ((TextView) view.findViewById(R.id.mobile)).getText().toString();
// Starting new intent
Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class);
in.putExtra(TAG_NAME, name);
in.putExtra(TAG_Location, cost);
in.putExtra(TAG_Company, description);
startActivity(in);
}
});
} }
因为您的Web服务返回的是一个
JSONArrayJSONObjectgetJSONFromUrlJSONArrayJSONObjectpublic JSONArray getJSONFromUrl(String url) {
JSONArray jsonarr=null;
// Making HTTP request
// try parse the string to a JSONArray
try {
jsonarr = new JSONArray(json);
} catch (JSONException e) {
}
// return JSON String
return jsonarr; //<<<< return JSONArray instead of JSONObject
}
因为您的Web服务返回的是一个
JSONArrayJSONObjectgetJSONFromUrlJSONArrayJSONObjectpublic JSONArray getJSONFromUrl(String url) {
JSONArray jsonarr=null;
// Making HTTP request
// try parse the string to a JSONArray
try {
jsonarr = new JSONArray(json);
} catch (JSONException e) {
}
// return JSON String
return jsonarr; //<<<< return JSONArray instead of JSONObject
}
我曾经使用过相同的教程，通过在try-catch块中替换JSONParser类中的代码解决了这个问题。这是一个毫无用处的类，您可以在onCreate（）中键入它，或在AndroidJSONParseActivity类中写入方法：
HttpClient httpclient = new DefaultHttpClient();
httpclient.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);
HttpGet request = new HttpGet(url);
HttpResponse response = httpclient.execute(request);
HttpEntity resEntity = response.getEntity();
String _response=EntityUtils.toString(resEntity); // content will be consume only once
Log.i(".......",_response);
JSONObject json = new JSONObject(_response);
JSONArray jarray = json.getJSONArray("array_name");
for(int i=0;i<jarray.length();i++)
{
JSONObject jb = (JSONObject) jarray.get(i);
String name = jb.getString("name");
}
HttpClient-HttpClient=newdefaulthttpclient（）；
httpclient.getParams（）.setParameter（CoreProtocolPNames.PROTOCOL_VERSION，HttpVersion.HTTP_1_1）；
HttpGet请求=新的HttpGet（url）；
HttpResponse response=httpclient.execute（请求）；
HttpEntity当前性=response.getEntity（）；
字符串_response=EntityUtils.toString（最近性）；//内容将只被消费一次
Log.i（“……”，_响应）；
JSONObject json=新的JSONObject（_响应）；
JSONArray jarray=json.getJSONArray（“数组名称”）；
对于（int i=0；i我曾经使用过相同的教程，我通过在try-catch块中替换JSONParser类中的代码来解决问题。无论如何，这个类都是无用的，您可以在onCreate（）中键入它，或者在AndroidJSONParseActivity类中写入方法：
HttpClient httpclient = new DefaultHttpClient();
httpclient.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);
HttpGet request = new HttpGet(url);
HttpResponse response = httpclient.execute(request);
HttpEntity resEntity = response.getEntity();
String _response=EntityUtils.toString(resEntity); // content will be consume only once
Log.i(".......",_response);
JSONObject json = new JSONObject(_response);
JSONArray jarray = json.getJSONArray("array_name");
for(int i=0;i<jarray.length();i++)
{
JSONObject jb = (JSONObject) jarray.get(i);
String name = jb.getString("name");
}
HttpClient-HttpClient=newdefaulthttpclient（）；
httpclient.getParams（）.setParameter（CoreProtocolPNames.PROTOCOL_VERSION，HttpVersion.HTTP_1_1）；
HttpGet请求=新的HttpGet（url）；
HttpResponse response=httpclient.execute（请求）；
HttpEntity当前性=response.getEntity（）；
String _response=EntityUtils.toString（resEntity）；//内容将只使用一次
Log.i（“……”，_响应）；
JSONObject json=新的JSONObject（_响应）；
JSONArray jarray=json.getJSONArray（“数组名称”）；
对于（int i=0；i列出整个堆栈跟踪，只列出与您的问题相关的代码。我们还有工作要做。伙计，您认为您的英语不好吗？如果是这样，请尝试使用正确的语法，使用上i表示i，而不是下i。向我们展示您的一些努力。您正在主UI线程上进行Web调用。这也是出现异常的原因。要解决它，yo你应该实现线程机制，最好的线程方式是使用AsyncTask
实现Web调用。把整个堆栈跟踪，只放与你的问题相关的代码。我们也有我们的工作要做。伙计，你认为你的英语不好吗？如果是这样，试着使用正确的语法，用上I代替下I。给我们展示一些效果你在主UI线程上进行Web调用。这也是异常的原因。要解决它，你应该实现线程机制，最好的线程方式是使用AsyncTask
实现Web调用。你在回答中有什么建议？我的意思是用户在代码中犯了什么错误。我想他正在最新的v上运行应用程序android版本，他在主线程上执行Http服务器请求，这就是他面临问题的原因。他应该使用异步任务，这是你应该在回答中包含的内容，以获得upvote:）否则简单的代码并不是完美的答案。实际上我不需要upvote，我只是想帮助。其次，他正在做这件事“填充列表"我以一种复杂的方式给了他做同样事情的简单代码，但你为什么不在答案中描述它，而不是在这里发表评论。你的答案中有什么建议？我的意思是用户在代码中犯了什么错误。我想他在最新版本的android上运行应用程序，在主线程上执行Http服务器请求为什么他会面临这个问题。他应该使用异步任务来解决这个问题，这是你应该在答案中包含的东西，以获得更新投票：）否则简单的代码并不是完美的答案。事实上，我不需要更新投票，我只是想帮点忙。其次，他在做“填充列表”这件事我以一种复杂的方式给了他做同样事情的简单代码，但你为什么不在答案中描述它，而不是在这里添加注释。刚刚测试了它，它又失败了：（@leythisham:post您的最新代码。我认为您正在使用contacts jsonArray而不是json从Arraywell获取价值。您100%正确，代码正在运行。非常感谢您的帮助。我看到了jsonArray和jsonObject现在的功能。刚刚对其进行了测试，但再次失败：（@leythisham:发布你的最新代码。我认为你是在使用联系人jsonArray而不是json从Arraywell获得价值。你说得100%对，代码现在可以工作了。非常感谢你的帮助。我知道你现在对jsonArray和jsonObject做了什么。