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Android Json array data Error and unable to find or get data from json array index

Dear Friends, i want to get json array data's value from index and compare with my store id.
For example:
i want to get instituteID from json array and compare with value "3" and if it is true then display stored subject value in textview if (instituteID == 3){tv.setText(subject);} instituteID and subject is also coming from json.tell me where i'm wrong
ArrayList<HashMap<String,String>> arraylist = new ArrayList<>();
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv1 = (TextView)findViewById(R.id.subject1);
tv2 = (TextView)findViewById(R.id.subject2);
tv3 = (TextView)findViewById(R.id.subject3);
tv4 = (TextView)findViewById(R.id.subject4);
tv5 = (TextView)findViewById(R.id.subject5);
tv6 = (TextView)findViewById(R.id.subject6);
//here calling json asynctask
new getTacherJson().execute();
DisplayData();
}
public void DisplayData(){
SharedPreferences preferences = getSharedPreferences("Email's response",MODE_PRIVATE);
shared_pref_emal = preferences.getString("response",null);
Log.e("Email's response",shared_pref_emal);
SharedPreferences preferences1 = getSharedPreferences("Institute's ID",MODE_PRIVATE);
shared_pref_ins_id = preferences1.getString("response id",null);
Log.e("inst. id",shared_pref_ins_id);
if (institute_ID == shared_pref_ins_id){
tv1.setText(subject);
tv2.setText(subject2);
tv3.setText(subject3);
tv4.setVisibility(View.GONE);
tv5.setVisibility(View.GONE);
tv6.setVisibility(View.GONE);
}
else {
tv1.setText("Nothing");
}
}
//here is my Json Data
{"response":[{"id":"11","class":"One Class","section":"Morning","teacher":"abc#gmail.com","subject":"Urdu","fromTime":"08:00","toTime":"08:30","instituteID":"3","created_at":"2019-09-12 04:39:31"},{"id":"12","class":"One Class","section":"Morning","teacher":"abc#gmail.com","subject":"Pakistan Studies","fromTime":"08:30","toTime":"09:00","instituteID":"3","created_at":"2019-09-12 04:39:49"},{"id":"13","class":"BSSE","section":"Evening","teacher":"abc#gmail.com","subject":"Introduction to CMP","fromTime":"15:00","toTime":"17:30","instituteID":"3","created_at":"2019-09-16 07:39:43"}]}
MyHttpHandler myhttp = new MyHttpHandler();
String teacherURL = url+"/showTeacherCourses/"+get_email+"/"+shared_pref_ins_id;
String teachDash = myhttp.MyServiceCall(teacherURL);
Log.e(TAG,"Response From Teacher Courses"+teachDash);
if (teachDash != null) {
try {
JSONObject jsonObject = new JSONObject(teachDash);
JSONArray teachArray = jsonObject.getJSONArray("response");
Log.e("Array length", String.valueOf(teachArray.length()));
// looping through All Contacts
for (int i = 0; i < teachArray.length(); i++) {
JSONObject c = teachArray.getJSONObject(i);
id1 = c.getString("id");
clasx = c.getString("class");
section = c.getString("section");
teacher_emaill = c.getString("teacher");
subject = c.getString("subject");
from_time = c.getString("fromTime");
to_time = c.getString("toTime");
institute_ID = c.getString("instituteID");
created_at = c.getString("created_at");
HashMap<String, String> tech_dta_ftch = new HashMap<>();
// adding each child node to HashMap key => value
tech_dta_ftch.put("id", id1);
tech_dta_ftch.put("class",clasx);
tech_dta_ftch.put("section",section);
tech_dta_ftch.put("teacher",teacher_emaill);
tech_dta_ftch.put("subject",subject);
tech_dta_ftch.put("fromTime",from_time);
tech_dta_ftch.put("toTime",to_time);
tech_dta_ftch.put("created_at", created_at);
tech_dta_ftch.put("instituteID", institute_ID);
// adding contact to contact list
arraylist.add(tech_dta_ftch);

Try this :
for(int i = 0; i < teachArray.length(); i++){
JSONObject c = teachArray.getJSONObject(i);
HashMap<String, String> tech_dta_ftch = new HashMap<>();
tech_dta_ftch.put("id", c.getString("id"));
tech_dta_ftch.put("class",c.getString("class"));
tech_dta_ftch.put("section",c.getString("section"));
tech_dta_ftch.put("teacher",c.getString("teacher"));
tech_dta_ftch.put("subject",c.getString("subject"));
tech_dta_ftch.put("fromTime",c.getString("fromTime"));
tech_dta_ftch.put("toTime",c.getString("toTime"));
tech_dta_ftch.put("created_at", c.getString("created_at"));
tech_dta_ftch.put("instituteID", c.getString("instituteID"));
arraylist.add(tech_dta_ftch);
}
And to compare institute ID of at a specific index of your array list currently I am selecting at first index, you could use it probably your way:
if (arraylist.get(0).get("instituteID").equalsIgnoreCase("ID_TO_CHECK_WITH")){
//DO YOUR STUFF
}

.replace(list(x), "") Doesn't Work Java

I wrote code:
List<String> Names = new ArrayList<String>();
List<Double> Prices = new ArrayList<Double>();
List<String> Dates = new ArrayList<String>();
List<String> Hours = new ArrayList<String>();
List<String> iDs = new ArrayList<String>();
SimpleAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView resultsListView = (ListView) findViewById(R.id.listMyReceipts);
SearchView m = (SearchView) findViewById(R.id.action_search);
HashMap<String, String> NamePrice = new HashMap<>();
TextView test = (TextView) findViewById(R.id.test);
Names.add("Starbucks"); Prices.add(11.99); Dates.add("01/01/2017"); Hours.add("9:33");
Names.add("Apple Store"); Prices.add(500.00); Dates.add("01/01/2017"); Hours.add("9:30");
Names.add("Esselunga"); Prices.add(135.67); Dates.add("01/01/2017"); Hours.add("11:51");
Names.add("Mediaworld"); Prices.add(19.98); Dates.add("01/01/2017"); Hours.add("12:03");
Names.add("Starbucks"); Prices.add(11.99); Dates.add("01/01/2017"); Hours.add("12:47");
for (int i = 0; i < Names.size(); i++) {
iDs.add(";+#:" + i + ":#+;");
NamePrice.put(iDs.get(i) + Names.get(i), " " + Prices.get(i).toString() + "€" + " - " + Dates.get(i) + " " + Hours.get(i));
}
List<HashMap<String, String>> listItems = new ArrayList<>();
adapter = new SimpleAdapter(this, listItems, R.layout.list_item,
new String[] {"First", "Second"},
new int[] {R.id.listitemTitle, R.id.listitemSubItem});
//Integer x = 0;
//int x = -1;
Iterator it = NamePrice.entrySet().iterator();
for (int i = 0; i < iDs.size(); i++) {
HashMap<String, String> resultMap = new HashMap<>();
Map.Entry pair = (Map.Entry) it.next();
resultMap.put("First", pair.getKey().toString().replace(iDs.get(i), ""));
resultMap.put("Second", pair.getValue().toString());
listItems.add(resultMap);
}
//test.setText(IDs.get(x - 1));
resultsListView.setAdapter(adapter);
}
This should replace all the IDs into "". It doesn't. So the output could be: ;+#:0:#+;NAME1 12.99 ;+#:1:#+;NAME2 0.99
But in the second loop, if I say
resultMap.put("First", pair.getKey().toString().replace(IDs.get(0), ""));
it replaces correctly the element 0.
The output would be: NAME1 12.99 ;+#:1:#+;NAME2 0.99

You are not getting the entries of NamePrice in the order you expect. I inserted a System.out.println() in your second for loop and got the output in this order:
;+#:3:#+;Mediaworld
;+#:0:#+;Starbucks
;+#:4:#+;Starbucks
;+#:1:#+;Apple Store
;+#:2:#+;Esselunga
So you are trying to replace ;+#:0:#+; in ;+#:3:#+;Mediaworld and so forth. That doesn’t replace anything. The reason is that NamePrice is a HashMap. A HashMap’s iterator does not return the entries in any specific order, particularly not in the order they were inserted.
You may use a LinkedHashMap instead:
LinkedHashMap<String, String> NamePrice = new LinkedHashMap<>();
Its iterator returns the entries in the order they were created. So now the replacements work.

need to save all the values coming in for loop?

if (Username.equals(RegisteredUSer)) {
JSONArray nameObject = msg.getJSONArray("NameList");
for (int j = 0; j < nameObject.length(); j++) {
JSONObject name = nameObject.getJSONObject(j);
USername = name.getString("FirstName");
USerweight = name.getString("Weight");
Weight = Double.parseDouble(USerweight);
}
}
HERE i need to save all the username and weight coming within for loop and convert the userweight in double ,and extracting the save values within the same class??

Your version:
ArrayList<String> username = new ArrayList<String>();
ArrayList<Double> weight = new ArrayList<Double>();
if (Username.equals(RegisteredUSer)) {
JSONArray nameObject = msg.getJSONArray("NameList");
for (int j = 0; j < nameObject.length(); j++) {
JSONObject name = nameObject.getJSONObject(j);
USername = name.getString("FirstName");
USerweight = name.getString("Weight");
Weight = Double.parseDouble(USerweight);
username.add(USername);
weight.add(Weight);
}
}

U can use a string array or an arraylist.The syntax is ArrayList username=new ArrayList (); username.add (variablename); to extract the values call username.get (loopvariable);

ArrayList of HashMaps to string, and then back to ArrayList of HashMaps

I have a ArrayList<HashMap<String,String>> that I am using the toString() method on to store in a database.
Here is the code that I use to store it the toString() to a database (it works):
HashMap<String, String> commentsHash = null;
ArrayList<HashMap<String, String>> test2 = new ArrayList<HashMap<String, String>>();
for (int i=0; i < test.size(); i++)
{
String timestamp = test.get(i).get("timestamp");
String last_name = test.get(i).get("last_name");
String first_name = test.get(i).get("first_name");
String comment = test.get(i).get("comment");
commentsHash = new HashMap<String, String>();
commentsHash.put("creation_timestamp", timestamp);
commentsHash.put("first_name", first_name);
commentsHash.put("last_name", last_name);
commentsHash.put("comment", comment);
test2.add(commentsHash);
}
dbHelper.addCommentsToMyLiPost(Integer.parseInt(sqlId), test2.toString());
Here is the method I want to use to convert a string to a HashMap<String, String>:
protected HashMap<String,String> convertToStringToHashMap(String text){
HashMap<String,String> data = new HashMap<String,String>();
Pattern p = Pattern.compile("[\\{\\}\\=\\, ]++");
String[] split = p.split(text);
for ( int i=1; i+2 <= split.length; i+=2 ){
data.put( split[i], split[i+1] );
}
return data;
}
I have tried using .split(",") on the string to split the string into 2 parts, but instead of returning two, it returns 8.
Here is what the toString() method prints. It is an ArrayList of HashMaps, and I am trying to grab the two HashMaps that are inside of the ArrayList.
[{comment=hello, last_name=u1, first_name=u1, creation_timestamp=1404938643772}, {comment=hello2, last_name=u2, first_name=u2, creation_timestamp=1404963221598}]

In convertToStringToHashMap, when you put your data into HashMap, the old value will be replaced since they have same key for each records, such as comment, last_name, etc.
public static Map<String, Map<String, String>> convertToStringToHashMap(String text)
{
Map<String, Map<String, String>> map = new HashMap<String, Map<String, String>>();
Pattern p = Pattern.compile("[\\{\\}\\=\\, ]++");
String[] split = p.split(text);
Map<String, String> data = new HashMap<String, String>();
int gap = 8;
int key = 1;
for (int i = 1; i + 2 <= split.length; i += 2)
{
data.put(split[i], split[i+1]);
if((i + 1) % gap == 0)
{
map.put(String.valueOf(key++), data);
data = new HashMap<String, String>();
data.clear();
}
}
return map;
}
This will return a Map:
2={first_name=u2, last_name=u2, comment=hello2, creation_timestamp=1404963221598}
1={first_name=u1, last_name=u1, comment=hello, creation_timestamp=1404938643772}

This program will recreate the whole list from the database entry
Pattern firstPat = Pattern.compile("\\{.*?\\}");
Matcher firstMat = firstPat.matcher(text);
ArrayList<HashMap<String, String>> list = new ArrayList<>();
while(firstMat.find()){
HashMap<String, String> map = new HashMap<>();
String assignStrings = firstMat.group();
String [] assignGroups = assignStrings.substring(1,assignStrings.length()-1).split("\\s*\\,\\s*");
for(String assign:assignGroups){
String [] parts = assign.split("\\=");
map.put(parts[0], parts[1]);
}
list.add(map);
}
return list

Android : HashMap is showing only last array item in a Listview field

I'm prsing information from a json file and showing data in a custom ListView. Now, I have an Array named authors. Where authors are multiple. But, in ListView I can only see the last authors name or last array item .
How can I show all items ? Here is my code
for (int index = 0; index < jsonArray.length(); index++)
{
HashMap<String, String> temp = new HashMap<String,String>();
JSONObject jsonObject = jsonArray.getJSONObject(index);
String topic = jsonObject.getString("topic");
String type = jsonObject.getString("type");
String title = jsonObject.getString("title");
String absData = jsonObject.getString("abstract");
JSONArray getAuthorsArray = new JSONArray(jsonObject.getString("authors"));
for(int a =0 ; a < getAuthorsArray.length(); a++){
JSONObject getJSonObj = (JSONObject)getAuthorsArray.get(a);
String authordName = getJSonObj.getString("name");
Log.e("Name", authordName);
temp.put(KEY_AUTHOR, authordName);
}
temp.put(KEY_TOPIC, topic);
temp.put(KEY_TYPE, type);
temp.put(KEY_TITLE, title);
temp.put(KEY_ABSTRACT,absData);
list.add(temp);
}
}
simpleAdapter = new SimpleAdapter(this, list, R.layout.abstract_items, from, new int[]{R.id.abTopic,R.id.abType,R.id.abTitle,R.id.SubTitle});
setListAdapter(simpleAdapter);

temp.put(KEY_AUTHOR, authordName);
That's probably why. You are iterating over the all authors but HashMap will override values and only the last one is being saveed.
As I understand you are getting back a JSON response with an array of JSONObject. Each JSONObject holding some info and a sub-JSONArray of associated authors.
The easiest approach could be just building ArrayList<JSONObject> and extending BaseAdapter implementing an adapter of your own. It's very easy. For large collections of data search on ViewHolder pattern, for optimization.

'HashMap<String, String> temp;
for (int index = 0; index < jsonArray.length(); index++)
{
temp = new HashMap<String,String>();
JSONObject jsonObject = jsonArray.getJSONObject(index);
String topic = jsonObject.getString("topic");
String type = jsonObject.getString("type");
String title = jsonObject.getString("title");
String absData = jsonObject.getString("abstract");
JSONArray getAuthorsArray = new JSONArray(jsonObject.getString("authors"));
for(int a =0 ; a < getAuthorsArray.length(); a++){
JSONObject getJSonObj = (JSONObject)getAuthorsArray.get(a);
String authordName = getJSonObj.getString("name");
Log.e("Name", authordName);
temp.put(KEY_AUTHOR, authordName);
}
temp.put(KEY_TOPIC, topic);
temp.put(KEY_TYPE, type);
temp.put(KEY_TITLE, title);
temp.put(KEY_ABSTRACT,absData);
list.add(temp);
}
}
simpleAdapter = new SimpleAdapter(this, list, R.layout.abstract_items, from, new int[]{R.id.abTopic,R.id.abType,R.id.abTitle,R.id.SubTitle});
setListAdapter(simpleAdapter);'
you declare the "HashMap"line in above the onstart values.it will help for you.