嗨,在我的android应用程序中,我需要根据日期在列表视图中显示一些详细信息。当你打开应用程序时,它会获取最近十天的数据并显示出来。前几天这个应用程序运行良好,但现在它显示了一些致命的异常,我仔细检查了代码,无法发现任何错误。
错误是
02-09 12:37:11.399: E/AndroidRuntime(25430): FATAL EXCEPTION: main
02-09 12:37:11.399: E/AndroidRuntime(25430): Process: com.imaginet.everwinmatriculation, PID: 25430
02-09 12:37:11.399: E/AndroidRuntime(25430): java.lang.StringIndexOutOfBoundsException: length=802; regionStart=306; regionLength=-277
02-09 12:37:11.399: E/AndroidRuntime(25430): at java.lang.String.startEndAndLength(String.java:504)
02-09 12:37:11.399: E/AndroidRuntime(25430): at java.lang.String.substring(String.java:1333)
02-09 12:37:11.399: E/AndroidRuntime(25430): at com.imaginet.everwinmatriculation.EventsFragment$5.onResponse(EventsFragment.java:284)
02-09 12:37:11.399: E/AndroidRuntime(25430): at com.imaginet.everwinmatriculation.EventsFragment$5.onResponse(EventsFragment.java:1)
02-09 12:37:11.399: E/AndroidRuntime(25430): at com.android.volley.toolbox.JsonRequest.deliverResponse(JsonRequest.java:65)
02-09 12:37:11.399: E/AndroidRuntime(25430): at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99)
02-09 12:37:11.399: E/AndroidRuntime(25430): at android.os.Handler.handleCallback(Handler.java:739)
02-09 12:37:11.399: E/AndroidRuntime(25430): at android.os.Handler.dispatchMessage(Handler.java:95)
02-09 12:37:11.399: E/AndroidRuntime(25430): at android.os.Looper.loop(Looper.java:135)
02-09 12:37:11.399: E/AndroidRuntime(25430): at android.app.ActivityThread.main(ActivityThread.java:5312)
02-09 12:37:11.399: E/AndroidRuntime(25430): at java.lang.reflect.Method.invoke(Native Method)
02-09 12:37:11.399: E/AndroidRuntime(25430): at java.lang.reflect.Method.invoke(Method.java:372)
02-09 12:37:11.399: E/AndroidRuntime(25430): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)
02-09 12:37:11.399: E/AndroidRuntime(25430): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
代码是:
public class EventsFragment extends Fragment {
public EventsFragment(){}
Button btn1;
// Log tag
private static final String TAG = EventsFragment.class.getSimpleName();
private ProgressDialog pDialog;
private List<ExternalEvents> movieList = new ArrayList<ExternalEvents>();
private List<ExternalEvents> newlistfordescrip = new ArrayList<ExternalEvents>();
private ListView listView;
private CustomListAdapter adapter;
TextView txt;
ImageButton fmdate,tddate;
static String fdate,tdate;
public static final String INDEX = "event_details";
EditText fromdate,todate;
final Calendar c = Calendar.getInstance();
int mYear = c.get(Calendar.YEAR);
int mMonth = c.get(Calendar.MONTH);
int mDay = c.get(Calendar.DAY_OF_MONTH);
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_events, container, false);
return rootView;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
fromdate=(EditText)getActivity().findViewById(R.id.editText1);
todate=(EditText)getActivity().findViewById(R.id.editText2);
fmdate=(ImageButton) getActivity().findViewById(R.id.imageButton1);
tddate=(ImageButton) getActivity().findViewById(R.id.imageButton2);
showprograssdialog();
jsonReqOnStartUp();
fmdate.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
DatePickerDialog.OnDateSetListener mDateSetListener = new DatePickerDialog.OnDateSetListener() {
public void onDateSet(DatePicker view, int year,
int monthOfYear, int dayOfMonth) {
mDay = dayOfMonth;
mMonth = monthOfYear;
mYear = year;
updateDisplay();
}
private void updateDisplay() {
// TODO Auto-generated method stub
GregorianCalendar c = new GregorianCalendar(mYear, mMonth, mDay);
SimpleDateFormat sdf = new SimpleDateFormat("dd MMMM yyyy");
fromdate.setText(sdf.format(c.getTime()));
sdf = new SimpleDateFormat("dd-MM-yyyy");
fdate=sdf.format(c.getTime());
}
};
DatePickerDialog d = new DatePickerDialog(getActivity(),
mDateSetListener, mYear, mMonth, mDay);
d.getDatePicker().setMaxDate(System.currentTimeMillis()-1000);
d.show();
}
});
tddate.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
DatePickerDialog.OnDateSetListener mDateSetListener = new DatePickerDialog.OnDateSetListener() {
public void onDateSet(DatePicker view, int year,
int monthOfYear, int dayOfMonth) {
mDay = dayOfMonth;
mMonth = monthOfYear;
mYear = year;
updateDisplay();
}
private void updateDisplay() {
// TODO Auto-generated method stub
GregorianCalendar c = new GregorianCalendar(mYear, mMonth, mDay);
SimpleDateFormat sdf = new SimpleDateFormat("dd MMMM yyyy");
todate.setText(sdf.format(c.getTime()));
sdf = new SimpleDateFormat("dd-MM-yyyy");
tdate=sdf.format(c.getTime());
}
};
DatePickerDialog d = new DatePickerDialog(getActivity(),
mDateSetListener, mYear, mMonth, mDay);
d.getDatePicker().setMaxDate(System.currentTimeMillis()-1000);
d.show();
}
});
listView = (ListView) getActivity().findViewById(R.id.list);
adapter = new CustomListAdapter(getActivity(), movieList);
listView.setAdapter(adapter);
btn1 = (Button) getActivity().findViewById(R.id.button1);
btn1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(tdate==null)
{
Toast.makeText(getActivity(), "To Date Cannot be empty Please set it", Toast.LENGTH_LONG).show();
}
if(fdate==null)
{
Toast.makeText(getActivity(), "From Date Cannot be empty Please set it", Toast.LENGTH_LONG).show();
}
if(fdate == tdate)
{
Toast.makeText(getActivity(), "From and To date cannot be same", Toast.LENGTH_LONG).show();
}
if((fdate!=null)&&(tdate!=null)&&(fdate!=tdate))
{
movieList.clear();
newlistfordescrip.clear();
showprograssdialog();
makeJsonObjectRequest();
}
}
});
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// TODO Auto-generated method stub
String desc, tagDesc;
ExternalEvents m = movieList.get(position);
ExternalEvents n = newlistfordescrip.get(position);
desc=m.getdescription();
tagDesc=n.getdescription();
// Starting single contact activity
Intent in = new Intent(getActivity(),Eventsdisplay.class);
in.putExtra("eventdetails", m.getevent_details());
in.putExtra("date", m.getdate());
in.putExtra("description", n.getdescription());
if(m.getThumbnailUrl().get(0) != null)
{
in.putExtra("imageval", "notnull");
Bundle bundleObject = new Bundle();
bundleObject.putSerializable("image",m.getThumbnailUrl());
in.putExtras(bundleObject);
}
else
{
in.putExtra("imageval", "null");
}
startActivity(in);
}
});
// changing action bar color
getActivity().getActionBar().setBackgroundDrawable(
new ColorDrawable(Color.parseColor("#1b1b1b")));
}
void jsonReqOnStartUp(){
Calendar fDateload=new GregorianCalendar(mYear,mMonth,mDay-30);
Calendar tDateload=new GregorianCalendar(mYear,mMonth,mDay);
SimpleDateFormat sdf= new SimpleDateFormat("dd-MM-yyyy");
String tdateld=sdf.format(tDateload.getTime());
String fdateld=sdf.format(fDateload.getTime());
String url ="http://matric.everwinschool.in/webservice/rest/?module=internalevents&from="+fdateld+"&to="+tdateld;
url = url.replaceAll(" ", "%20");
// Creating volley request obj
JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.GET,
url, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
// TODO Auto-generated method stub
//showpDialog();
JSONArray value;
try {
value = response.getJSONArray("Internal Events");
for (int i = 0; i < value.length(); i++)
{
JSONObject obj = value.getJSONObject(i);
JSONObject objOther = value.getJSONObject(i);
ExternalEvents events = new ExternalEvents();
ExternalEvents tagEvents = new ExternalEvents();
tagEvents.setdescription(obj.getString("description"));
events.setevent_detils(obj.getString("event_details"));
events.setdate(obj.getString("date"));
tagEvents.setdescription(obj.getString("description"));
String strDescrip = obj.getString("description");
while(strDescrip.contains("&"))
strDescrip = strDescrip.replace(strDescrip.substring(strDescrip.indexOf("&"),strDescrip.indexOf(";")+1),"");
while(strDescrip.contains("<"))
strDescrip = strDescrip.replace(strDescrip.substring(strDescrip.indexOf("<"),strDescrip.indexOf(">")+1),"");
events.setdescription(strDescrip);
String str=obj.getString("image");
if(str.equalsIgnoreCase("null"))
{
events.setThumbnailUrl(0,null);
}
else
{
String[] mArray = str.split(",");
for(int j=0;j<mArray.length;j++)
{
events.setThumbnailUrl(j, mArray[j]);
}
mArray=null;
}
//Adding movie to movies array
movieList.add(events);
newlistfordescrip.add(tagEvents);
}
hidePDialog();
} catch (JSONException e) {
e.printStackTrace();
}
// notifying list adapter about data changes
// so that it renders the list view with updated data
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
Toast.makeText(getActivity(), "Unable to fetch data", Toast.LENGTH_LONG).show();
hidePDialog();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(jsonObjReq);
}
protected void makeJsonObjectRequest() {
// TODO Auto-generated method stub
String url ="http://matric.everwinschool.in/webservice/rest/?module=internalevents&from="+fdate+ "&to=" +tdate;
url = url.replaceAll(" ", "%20");
// Creating volley request obj
JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.GET,
url, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
// TODO Auto-generated method stub
//showpDialog();
JSONArray value;
try {
value = response.getJSONArray("Internal Events");
for (int i = 0; i < value.length(); i++)
{
JSONObject obj = value.getJSONObject(i);
JSONObject objOther = value.getJSONObject(i);
ExternalEvents events = new ExternalEvents();
ExternalEvents tagEvents = new ExternalEvents();
tagEvents.setdescription(obj.getString("description"));
events.setevent_detils(obj.getString("event_details"));
events.setdate(obj.getString("date"));
tagEvents.setdescription(obj.getString("description"));
String strDescrip = obj.getString("description");
while(strDescrip.contains("&"))
strDescrip = strDescrip.replace(strDescrip.substring(strDescrip.indexOf("&"),strDescrip.indexOf(";")+1),"");
while(strDescrip.contains("<"))
strDescrip = strDescrip.replace(strDescrip.substring(strDescrip.indexOf("<"),strDescrip.indexOf(">")+1),"");
events.setdescription(strDescrip);
String str=obj.getString("image");
String[] mArray = str.split(",");
for(int j=0;j<mArray.length;j++)
{
events.setThumbnailUrl(j, mArray[j]);
}
mArray=null;
// adding movie to movies array
movieList.add(events);
//String stradd = obj.getString("description");
newlistfordescrip.add(tagEvents);
}
hidePDialog();
} catch (JSONException e) {
e.printStackTrace();
}
// notifying list adapter about data changes
// so that it renders the list view with updated data
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
Toast.makeText(getActivity(), "Unable to fetch data", Toast.LENGTH_LONG).show();
hidePDialog();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(jsonObjReq);
}
private void showprograssdialog() {
// TODO Auto-generated method stub
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("Please wait...");
// pDialog.setCancelable(false);
pDialog.show();
}
protected void hidePDialog() {
// TODO Auto-generated method stub
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
}
