Android的列表视图具有的JSONObject [英] android List View having jsonObject
问题描述
我的工作活动这要求服务器与放一个php文件中;这个PHP文件将返回我一个 JSONArray 为 JSONObjects 作为要素。我得到这个 jArray ＆放大器;解压出来的内容，例如，所有的 jsonObjects 。每一个的JSONObject有像UNIQUEID，姓名，地址，联系方式等一个特定的用户数据......我向所有用户的列表。我需要当我点击列表项，它会显示我的关注用户的完整个人资料...＆放大器;对于我把另一个这样的提取 jsonObjects 的JSONObject 有UNIQUEID姓名和放大器;相应的提取的JSONObject 作为它的值。
I am working on activity which request one php file on server & this php file will return me one JSONArray having JSONObjects as its elements. I get this jArray & extract out its contents e.g., all jsonObjects. each jsonObject have data of one specific user like uniqueId, name, address, contact details etc... I showed a list of all users. I need when I click on list item it will show me complete profile of the concern user...& for that i put these extracted jsonObjects in another JSONObject having uniqueId as name & the corresponding extracted jsonObject as its value.
我的列表：
这！
当我点击这个名单，我得到了一个项目，它的 UNIQUEID 我需要的是，的JSONObject 为的JSONObject 作为它的值。
When i click on one item of this list I get its uniqueId what I need is, all keys of jsonObject having JsonObject as its values.
public void onItemClick(AdapterView<?> arg0, View arg1, int position, long id) {
ItemBean bean = (ItemBean) adapter.getItem(position);
Toast.makeText(this," FanId => " + bean.getUid() +" \n FanName => " + bean.getTitle(),
Toast.LENGTH_SHORT).show();
Iterator<String> userKeys=extracted();//here i get-> Null PointerException!
while(fKeys.hasNext()){
System.out.println("Key:"+userKeys.next());
}
}
//iterator that return me keys(e.g., all uids of users)
@SuppressWarnings("unchecked")
private Iterator<String> extracted() {
Iterator<String> keys = jFansData.keys();
return keys;
}
12-10 20:45:55.833: ERROR/AndroidRuntime(907): Caused by: java.lang.NullPointerException
12-10 20:45:55.833: ERROR/AndroidRuntime(907): at com.technotalkative.listview5.MainActivity.extracted(MainActivity.java:87)
12-10 20:45:55.833: ERROR/AndroidRuntime(907): at com.technotalkative.listview5.MainActivity.onCreate(MainActivity.java:51)
12-10 20:45:55.833: ERROR/AndroidRuntime(907): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
我没有得到我做什么错在这里，任何解决方案，请...
下面是完整的code我的类 - >
public class MainActivity extends Activity implements OnItemClickListener {
String url,fd;
ListView mFansListView;
JSONObject jFan_Data;//contain data of an indivisual fan
JSONObject jFansData;//contain data of an all fans
ListViewCustomAdapter adapter;
LayoutInflater lInflater;
private ArrayList<Object> fansList;
private ItemBean bean;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
prepareArrayLits();
mFansListView = (ListView) findViewById(android.R.id.list);
adapter = new ListViewCustomAdapter(this, fansList);
mFansListView.setAdapter(adapter);//come null pointer exception when no fan data is returned! hendle it...
mFansListView.setOnItemClickListener(this);
}
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position, long id) {
// TODO Auto-generated method stub
ItemBean bean = (ItemBean) adapter.getItem(position);
Toast.makeText(this," FanId => " + bean.getUid() +" \n UID => " + bean.getTitle(), Toast.LENGTH_SHORT).show();
Iterator<String> fKeys=extracted();
while(fKeys.hasNext()){
System.out.println("Key:"+fKeys.next());
}
}
//....................................................................
//iterator that return me keys(e.g., all uids of fans) through which i match clicked lists id
@SuppressWarnings("unchecked")
private Iterator<String> extracted() {
Iterator<String> keys = jFansData.keys();//I get NullPointerExcertion over here...???
return keys;
}
//.............................................................................
/* *Method used to prepare the ArrayList,
*/
public void prepareArrayLits()
{
url="http://192.168.200.111/ManU/location1_and.php";
HttpClient client = new DefaultHttpClient();
HttpConnectionParams.setConnectionTimeout(client.getParams(), 10000);
HttpResponse response;
JSONObject json = new JSONObject();
try {
HttpPost post=new HttpPost(url);
/**! Currently all these parameters are hard coded...
* In future i have to use services of LocationManager to get my current location!
*/
json.put("radius", 1000);
json.put("lat", 12.9716060);
json.put("lang", 77.5903760);
json.put("myid", "h9ow0");
post.setHeader("json", json.toString());
StringEntity se=new StringEntity(json.toString());
se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
post.setEntity(se);
response=client.execute(post);
/* Checking response */
// Get the data in the entity
InputStream in=response.getEntity().getContent();
//convert it to string...
fd=convertStreamToString(in);
Log.i("Read from Server", fd);
//Checking that fd is array containing data of all users or have no data...
String no_data="No Data";
if(no_data==fd){
Log.i("NoRecords", "No Users Near you... Try over long distance!");
}else {
JSONArray jArray = new JSONArray(fd);//contain array returned by "php" having data of all users
try{
fansList = new ArrayList<Object>();
for(int i=0;i<jArray.length();i++){
//will return the data of each row fetched from JSONArray returned by location1.php
String data_of_each_user=jArray.get(i).toString();
Log.i("Data Of User at index "+i+" is", data_of_each_user);
//I put the object at index "i" into JSONObject & retrieve data from name-value pair
jFan_Data=jArray.getJSONObject(i);//data of User at index i in array
AddObjectToList(jFan_Data.getString("uniqid").toString(),R.drawable.ic_add, jFan_Data.getString("name"), jFan_Data.getString("distance"));
try{
/** this JSONObject hold data of all users taking UniqueId of user as key &
* JSONObject at index i in the array returned by the php as the value!!! */
jFansData.put(jFan_Data.get("uniqid").toString(), jFan_Data);//why i getting NullPointerException Over Here...???
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
//..............................................................................
// Add one item into the Array List
public void AddObjectToList(String uid,int image, String title, String desc)
{
bean = new ItemBean();
bean.setUid(uid);
bean.setDescription(desc);
bean.setImage(image);
bean.setTitle(title);
fansList.add(bean);
}
// -------------------------------------------------------------------------
//convert respons into human readable formate
private static String convertStreamToString(InputStream is) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
}
正如我上面提到的，我需要向用户展示的完整个人资料当我点击列表项......所以，我做什么来解决这个问题！ ???
as i mentioned above, I need to show the complete profile of the user when i click on list item... So, What i do to solve this problem!!! ???
推荐答案
好了，所以我想通了，凡我错了。因为我从PHP和放大器JSONObjects之一JSONArray;每个JSONObject的是一个用户的完整的数据，因此对于有代表创造一种新的JSONObject（用户的关键和放大器具有唯一ID; JSONObject的索引i作为它的价值），我只是PIC的JSONArrray中的onClick＆放大器;通过它的元素（即JSONObjects）及不见了;当前的JSONObject的UniqueID元素匹配，我得到当我点击列表项目的UID。如果匹配的话，我借此jObject和放大器;使用它的值，如果没有的话去其他。
Ok so I figured it out that where i am wrong. as i get one JSONArray of JSONObjects from php & each JSONObject is the complete data of one user so there for behalf of creating one new JSONOBject(having UniqueId of user as key & JSONObject at index i as its Value), i simply pic the JSONArrray in "onClick" & gone through its elements(i.e., JSONObjects) & match the UniqueId element of current JSONObject with the uid which i get when i click on list item. If it match then i take this jObject & use its values if not then go for other.
public void onItemClick(AdapterView<?> arg0, View arg1, int position, long id) {
// TODO Auto-generated method stub
ItemBean bean = (ItemBean) adapter.getItem(position);
Toast.makeText(this," FanId => " + bean.getUid() +" \n UID => " + bean.getTitle(), Toast.LENGTH_SHORT).show();
/**from here-> I am going to start one activity that show the complete profile of a
* particular user... According to the unique id received from clicking on ListItem!
*/
for(int i=0;i<jArray.length();i++){
try {
JSONObject jFan_Data=jArray.getJSONObject(i);
String uid=jFan_Data.getString("uniqid");
if(uid.equals(bean.getUid())){
//New Intent that start new Activity that show Profile of user
String nm = jFan_Data.get("name").toString();// +"\n";
String add = jFan_Data.get("address").toString();
String city = jFan_Data.get("city").toString();
String state = jFan_Data.get("state").toString();
String zip = jFan_Data.get("postcode").toString();
String uniqid = jFan_Data.get("uniqid").toString();
String lat = jFan_Data.get("lat").toString();
String lng = jFan_Data.get("lang").toString();
String phone = jFan_Data.get("phone").toString();
String mob = jFan_Data.get("mobile").toString();
String email = jFan_Data.get("email").toString();
String dis = jFan_Data.get("distance").toString();
String[] jFanData={nm,add,city,state,zip,phone,mob,email,dis,uniqid,lat,lng};
Intent in= new Intent(getParent(), FanProfile.class);
TabGroupActivity prnt = (TabGroupActivity) getParent();
Bundle fBundle= new Bundle();
fBundle.putStringArray("jFanData", jFanData);
in.putExtras(fBundle);
prnt.startChildActivity("FanProfile", in);
//startActivity(in);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
坦克所有的回应我提出的宝贵意见和放大器;建议！ ：）
Tanks to all that respond me for their valuable comments & suggestions! :)
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