如何解决java.lang.IndexOutOfBoundsException:无效的索引0，大小为0? [英] how to solve java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0?
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问题描述
我有两个autocompletetextviews，在第一个autocompletetextview中，我正在使用json从服务器获取项目，以下是对此的响应
I have two autocompletetextviews,in first autocompletetextview i am getting items from server using json,the following is response for that
{"status":"success","clientlist":[{"cid":"1","name":"margi"},{"cid":"2","name":"steven"}],"productboxtype":[{"pbxid":"1","pbxname":"1 Dozen","qtyperbox":"12"},{"pbxid":"2","pbxname":"2 Dozens","qtyperbox":"24"},{"pbxid":"3","pbxname":"3 Dozens","qtyperbox":"36"}]}
我能够在我的第一个自动填充中获得姓名，并且可以正常工作
i am able to get names in my first autocomplete and it works fine,
现在的问题是假设用户选择项目"margi"，其cid为1，因此我再次向服务器发送请求并尝试获取"margi"的产品名称，其响应为
Now issue is suppose user select item "margi" and its cid is 1,so again i am sending request to server and trying to get productnames of 'margi',and its response is
{"status":"success","clientproduct":[{"pid":"4","name":"kangan pair","unitprice":"1500","boxqty":"1","bulkprice":[{"minqty":"10","price":"1500"},{"minqty":"15","price":"1470"},{"minqty":"20","price":"1460"}]}]}
MAniActivity
MAniActivity
public class MainActivity extends Activity {
private AutoCompleteTextView acTextView;
private String catidtemp;
private String catid;
JSONParser jsonParser = new JSONParser();
private AutoCompleteTextView autoproduct;
private static final String FEEDBACK_URL = "";
private static final String FEEDBACK_SUCCESS = "status";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
acTextView = (AutoCompleteTextView) findViewById(R.id.autocmplte_clorder_clname);
acTextView.setAdapter(new SuggestionAdapterClientList(this,acTextView.getText().toString()));
autoproduct=(AutoCompleteTextView)findViewById(R.id.autocmplte_clorder_product);
autoproduct.setAdapter(new SuggestionAdapterClientProduct(this, autoproduct.getText().toString()));
acTextView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
JsonParseClientProduct jp=new JsonParseClientProduct();
List<SuggestGetSetClientProduct> list1 = new ArrayList<SuggestGetSetClientProduct>();
list1 =jp.getParseJsonWCF(autoproduct.getText().toString());
if(position < list1.size())
new AttemptLogin(Integer.parseInt(list1.get(position).getId())).execute();
}
});
}
class AttemptLogin extends AsyncTask<String, String, String> {
boolean failure = false;
private ProgressDialog pDialog;
private int selected_cid=1;
AttemptLogin(int selected_cid){
this.selected_cid=selected_cid;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Sending..");
pDialog.setIndeterminate(true);
// pDialog.setIndeterminateDrawable(getResources().getDrawable(R.drawable.custom_progress));
pDialog.setCancelable(true);
pDialog.show();
}
@SuppressWarnings("unused")
@Override
protected String doInBackground(String...args) {
//Check for success tag
//int success;
Looper.prepare();
try {
JsonParseClientList jp=new JsonParseClientList();
List<NameValuePair> params = new ArrayList<NameValuePair>();
List<SuggestGetSetClientList> list =jp.getParseJsonWCF(acTextView.getText().toString());
for(int i = 0;i<list.size();i++)
{
if(list.get(i).getName().equals(acTextView.getText().toString()))
// params.add(new BasicNameValuePair("cid",list.get(i).getId()));
params.add(new BasicNameValuePair("cid",String.valueOf(selected_cid)));
// catid=list.get(i).getId();
// catidtemp=list.get(i).getId();
}
catidtemp=String.valueOf(selected_cid);
// catidtemp=list.get(i).getId();
System.out.println("cattttttiiiiddd????"+catidtemp);
params.add(new BasicNameValuePair("action", "clientproduct"));
System.out.println("su gayu server ma????"+params);
Log.d("request!", "starting");
// getting product details by making HTTP request
JSONObject json = jsonParser.makeHttpRequest (
FEEDBACK_URL, "POST", params);
//check your log for json response
Log.d("Login attempt", json.toString());
JSONObject jobj = new JSONObject(json.toString());
final String msg = jobj.getString("msg");
return json.getString(FEEDBACK_SUCCESS);
}catch (JSONException e) {
e.printStackTrace();
}
return null;
}
// After completing background task Dismiss the progress dialog
protected void onPostExecute(String file_url) {
//dismiss the dialog once product deleted
pDialog.dismiss();
//parentcat.getText().clear();
}}
public class SuggestGetSetClientProduct {
String id,name;
public SuggestGetSetClientProduct(String id, String name){
this.setId(id);
this.setName(name);
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
public class JsonParseClientProduct {
double current_latitude,current_longitude;
public JsonParseClientProduct(){}
public JsonParseClientProduct(double current_latitude,double current_longitude){
this.current_latitude=current_latitude;
this.current_longitude=current_longitude;
}
public List<SuggestGetSetClientProduct> getParseJsonWCF(String sName)
{
List<SuggestGetSetClientProduct> ListData = new ArrayList<SuggestGetSetClientProduct>();
try {
String temp=sName.replace(" ", "%20");
System.out.println("what the...."+js);
URLConnection jc = js.openConnection();
BufferedReader reader = new BufferedReader(new InputStreamReader(jc.getInputStream()));
String line = reader.readLine();
JSONObject jsonResponse = new JSONObject(line);
Log.d("test", "Response : " +jsonResponse);
JSONArray jsonArray = jsonResponse.getJSONArray("clientproduct");
for(int i = 0; i < jsonArray.length(); i++){
JSONObject r = jsonArray.getJSONObject(i);
ListData.add(new SuggestGetSetClientProduct(r.getString("pid"),r.getString("name")));
}
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
return ListData;
}
}
public class SuggestionAdapterClientProduct extends ArrayAdapter<String>{
protected static final String TAG = "SuggestionAdapter";
List<String> suggestions = new ArrayList<String>();
// private List<String> suggestions;
public SuggestionAdapterClientProduct(Activity context, String nameFilter) {
super(context, android.R.layout.simple_dropdown_item_1line);
suggestions = new ArrayList<String>();
}
@Override
public int getCount() {
return suggestions.size();
}
@Override
public String getItem(int index) {
return suggestions.get(index);
}
@Override
public Filter getFilter() {
Filter myFilter = new Filter() {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults filterResults = new FilterResults();
JsonParseClientProduct jp=new JsonParseClientProduct();
if (constraint != null) {
// A class that queries a web API, parses the data and
// returns an ArrayList<GoEuroGetSet>
List<SuggestGetSetClientProduct> new_suggestions = new ArrayList<SuggestGetSetClientProduct>();
new_suggestions =jp.getParseJsonWCF(constraint.toString());
Log.d("test", "Size of array : " +new_suggestions.size());
//List<SuggestGetSetClientProduct> new_suggestions =jp.getParseJsonWCF(constraint.toString());
suggestions.clear();
/*for (int i=0;i<new_suggestions.size();i++) {
suggestions.add(new_suggestions.get(i).getName());
}*/
for (int i=0;i<new_suggestions.size();i++) {
String name=new_suggestions.get(i).getName();
String id=new_suggestions.get(i).getId();
System.out.println("checis id"+id);
if(name.contains(constraint)){
suggestions.add(new_suggestions.get(i).getName());
}
}
// Now assign the values and count to the FilterResults
// object
filterResults.values = suggestions;
filterResults.count = suggestions.size();
}
return filterResults;
}
@Override
protected void publishResults(CharSequence contraint,
FilterResults results) {
if (results != null && results.count > 0) {
notifyDataSetChanged();
} else {
notifyDataSetInvalidated();
}
}
};
return myFilter;
}
}
}
推荐答案
java.lang.IndexOutOfBoundsException:无效的索引0，大小为0，位于 java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251)
java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0 at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251)
我相信问题就在这里，
List<SuggestGetSetClientProduct> new_suggestions =jp.getParseJsonWCF(constraint.toString());
您初始化了ArrayList吗?
List<SuggestGetSetClientProduct> new_suggestions = new ArrayList<SuggestGetSetClientProduct>;
在进入For循环之前，先检查ArrayList的大小.
Check the size of the ArrayList first before it goes to For loop.
您的代码应类似于
if (constraint != null) {
List<SuggestGetSetClientProduct> new_suggestions = new ArrayList<SuggestGetSetClientProduct>();
new_suggestions =jp.getParseJsonWCF(constraint.toString());
Log.d("test", "Size of array : " +new_suggestions.size());
// rest code here..//
此外，您没有在SuggestionAdapterClientProduct类中初始化列表，
Also, you didn't initialize your list in SuggestionAdapterClientProduct class,
private List<String> suggestions;
通过以下方式初始化您的arrayList
Initialize your arrayList by,
List<String> suggestions = new ArrayList<String>();
在那个班上.
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