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На самом деле я пытался разобрать JSON и проанализировать данные, которые не отображаются в списке. Я работал с использованием эмулятора, получившего следующую ошибку в logcat. Я не могу найти ошибку. Может ли кто-нибудь помочь?данные не отображаются в моем списке
ListStartActivity
public class ListStartActivity extends Activity{
int start =0;
int limit =10;
boolean loadingMore = false;
ListView lv;
SimpleAdapter adpt;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.business);
adpt = new SimpleAdapter(new ArrayList<Lists>(), this);
lv = (ListView)findViewById(R.id.listView);
lv.setAdapter(adpt);
lv.setTextFilterEnabled(true);
(new AsyncListViewLoader()).execute("http://10.0.2.2:8080/ListDetails/list_details/");
}
private class AsyncListViewLoader extends AsyncTask<String, Void, List<Lists>>{
private final ProgressDialog dialog = new ProgressDialog(ListStartActivity.this);
private String address;
private String name;
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
dialog.setMessage("Downloading details.....");
dialog.show();
}
@Override
protected void onPostExecute(List<Lists> result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
dialog.dismiss();
adpt.setItemList(result);
adpt.notifyDataSetChanged();
}
@Override
protected List<Lists> doInBackground(String... params) {
// TODO Auto-generated method stub
List<Lists> result = new ArrayList<Lists>();
try{
URL u = new URL(params[0]);
HttpURLConnection conn = (HttpURLConnection) u.openConnection();
conn.setRequestMethod("POST");
conn.connect();
InputStream is = conn.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
StringBuilder sb = new StringBuilder();
String line = null;
while((line = reader.readLine()) != null){
sb.append(line + "\n");
}is.close();
//result = sb.toString();
JSONArray jArray = new JSONArray(result);
for(int i=0; i<jArray.length(); i++){
JSONObject json_data = jArray.getJSONObject(i);
Lists ls = new Lists(name,address);
ls.setName(json_data.getString(name));
ls.setAddress(json_data.getString(address));
result.add(ls);
}
return result;
}catch(Throwable t){
t.printStackTrace();
}
return null;
}
}
}
SimpleAdapter
public class SimpleAdapter extends ArrayAdapter<Lists>{
private List<Lists> itemList;
private Context context;
public SimpleAdapter(List<Lists> itemList, Context ctx) {
super(ctx, android.R.layout.simple_list_item_2, itemList);
// TODO Auto-generated constructor stub
this.itemList = itemList;
this.context = ctx;
}
public int getCount(){
if(itemList != null)
return itemList.size();
return 0;
}
public Lists getItem(int position){
if(itemList != null)
return itemList.get(position);
return null;
}
public long getItemId(int position){
if(itemList != null)
return itemList.get(position).hashCode();
return 0;
}
@SuppressLint("InflateParams")
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View v = convertView;
if(v == null){
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = inflater.inflate(R.layout.lists, null);
}
Lists l = itemList.get(position);
TextView text1 = (TextView)v.findViewById(R.id.name);
text1.setText(l.getName());
TextView text2 = (TextView)v.findViewById(R.id.address);
text2.setText(l.getAddress());
return v;
}
public List<Lists> getItemList(){
return itemList;
}
public void setItemList(List<Lists> itemList){
this.itemList = itemList;
System.out.println("Set Items List: "+itemList);
}
}
Logcat
10-24 10:44:02.323: A/NetworkStats(90): problem reading network stats
10-24 10:44:02.323: A/NetworkStats(90): java.lang.IllegalStateException: problem parsing line: null
10-24 10:44:02.323: A/NetworkStats(90): at com.android.internal.net.NetworkStatsFactory.readNetworkStatsDetail(NetworkStatsFactory.java:313)
10-24 10:44:02.323: A/NetworkStats(90): at com.android.server.NetworkManagementService.getNetworkStatsUidDetail(NetworkManagementService.java:1271)
10-24 10:44:02.323: A/NetworkStats(90): at com.android.server.net.NetworkStatsService.performPollLocked(NetworkStatsService.java:810)
10-24 10:44:02.323: A/NetworkStats(90): at com.android.server.net.NetworkStatsService.performPoll(NetworkStatsService.java:771)
10-24 10:44:02.323: A/NetworkStats(90): at com.android.server.net.NetworkStatsService.access$100(NetworkStatsService.java:128)
10-24 10:44:02.323: A/NetworkStats(90): at com.android.server.net.NetworkStatsService$3.onReceive(NetworkStatsService.java:610)
10-24 10:44:02.323: A/NetworkStats(90): at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:728)
10-24 10:44:02.323: A/NetworkStats(90): at android.os.Handler.handleCallback(Handler.java:605)
10-24 10:44:02.323: A/NetworkStats(90): at android.os.Handler.dispatchMessage(Handler.java:92)
10-24 10:44:02.323: A/NetworkStats(90): at android.os.Looper.loop(Looper.java:137)
10-24 10:44:02.323: A/NetworkStats(90): at android.os.HandlerThread.run(HandlerThread.java:60)
10-24 10:44:02.323: A/NetworkStats(90): Caused by: java.io.FileNotFoundException: /proc/net/xt_qtaguid/stats: open failed: ENOENT (No such file or directory)
10-24 10:44:02.323: A/NetworkStats(90): at libcore.io.IoBridge.open(IoBridge.java:406)
10-24 10:44:02.323: A/NetworkStats(90): at java.io.FileInputStream.<init>(FileInputStream.java:78)
10-24 10:44:02.323: A/NetworkStats(90): at java.io.FileReader.<init>(FileReader.java:42)
10-24 10:44:02.323: A/NetworkStats(90): at com.android.internal.net.NetworkStatsFactory.readNetworkStatsDetail(NetworkStatsFactory.java:272)
10-24 10:44:02.323: A/NetworkStats(90): ... 10 more
10-24 10:44:02.323: A/NetworkStats(90): Caused by: libcore.io.ErrnoException: open failed: ENOENT (No such file or directory)
10-24 10:44:02.323: A/NetworkStats(90): at libcore.io.Posix.open(Native Method)
10-24 10:44:02.323: A/NetworkStats(90): at libcore.io.BlockGuardOs.open(BlockGuardOs.java:98)
10-24 10:44:02.323: A/NetworkStats(90): at libcore.io.IoBridge.open(IoBridge.java:390)
10-24 10:44:02.323: A/NetworkStats(90): ... 13 more
проверьте сетевое соединение до того, как он набрал URL-адрес в 'doinbackground' и ваш' return null' в 'doinbackground', чтобы изменить 'retrun result'. – prakash
@prakash Я не думаю, что «return null» будет выполняться, если не будет обнаружено какое-то исключение; есть «результат возврата» прямо над этим. ;) – shyam