Develop Reference

Compare Two JSONArray In Android

I want to compare two JSONArray with the same value with different order how compare it. This code work fine if value place in the same index.
String a = "[\"ABC-110101-056079-0001\",\"CBA-111101-056079-0001\",\"BCD-110101-056079-0011\"]";
String b = "[\"ABC-111101-056079-0001\",\"CBA-110101-056079-0001\",\"BCD-110101-056079-0011\"]";
JSONArray jsonArraya = null;
JSONArray jsonArrayb = null;
try {
jsonArraya = new JSONArray(a);
jsonArrayb = new JSONArray(b);
} catch (JSONException e) {
e.printStackTrace();
}
if (jsonArraya.equals(jsonArrayb)) {
Log.i("TAG",str2 is equal to str1 = " + "true");
}

You could add the elements of each array to a SortedSet instance and compare those:
SortedSet<Object> seta = new TreeSet<>();
jsonArraya.forEach(seta::add);
SortedSet<Object> setb = new TreeSet<>();
jsonArrayb.forEach(setb::add);
Log.i("TAG", "str2 is equal to str1 = " + seta.equals(setb));

The best solution in this situation is to parse values of those arrays first using Gson into POJO files, After that create .equals() method, which will add all strings from array into Set<>.
Then iterate over one set and remove all current item from another set and remove the same elements. Both objects are the same if at the end there will be no elements in the second set.

Android json array: how do I get and specific string? [duplicate]

This question already has answers here:
How do I parse JSON in Android? [duplicate]
(3 answers)
Closed 6 years ago.
I have a Json script which get data from a Mysql database and print it in different TextViews. The thing I want to know is how can I take for example only the "idE" value and print it in the "TextViewTitulo" TextView
try {
String response = "[{"0":"1","id":"1","1":"f3n","idE":"f3n","2":"bar","tipo":"bar"},{"0":"1","id":"1","1":"f3n","idE":"f3n","2":"bar2","tipo":"bar2"}]"
JSONArray array;
array = new JSONArray(response);
StringBuilder sb = new StringBuilder();
for (i=0; i<array.length(); i++) {
// chain each string, separated with a new line
sb.append(array.getString(i) + "\n");
}
// display the content on textview
textViewTitulo.setText(sb.toString());
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
My code works fine, but is displays the whole string of values

You have 2 objects in your JSONArray, and 1 textview to show the data in, so I'm adding append " " to separate them.
for (i=0; i<array.length(); i++) {
sb.append(array.getJSONObject(i).getString("idE"));
sb.append(" ");
//do whatever with it
}
textViewTitulo.setText(sb.toString());

Of course you can get it, you just have to iterate through the whole JSONArray. If you know the value you are looking for, you have to search for it, if you know the index - it is easier, you just have to get it. So for the first case, you could do something like:
for (int i = 0; i < array.length(); i++) {
JSONObject current = array.getJSONObject(i);
// In your case the JSONObject is more complicated
// so you need to iterate over it too
Iterator<?> keys = current.keys();
while(keys.hasNext()) {
String key = (String)keys.next();
String value = current.get(key);
// Do something with the value
}
// Or If you know what key you are looking for, you may do
String value = current.get("idE");
// Do something with value
}

Why do I get an empty response when my android app calls my API on my server?

I have android application that called information and show it as a list.
I have a spinner when you choose the date from the spinner you get the information related to that date.
In the app first load it calls automatically today information.
this is the code I use in my main activity to create my spinner and fill it with elements and handle the clicks on each item:
// Spinner element
spinner = (Spinner) v.findViewById(R.id.spinner);
// Spinner click listener
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
// On selecting a spinner item
//String item = parent.getItemAtPosition(position).toString();
switch(position){
case 3:
if (JsonUtils.isNetworkAvailable(getActivity())) {
list.clear();
new MyTask().execute(Config.SERVER_URL + "/banko_api.php?d_o=-1");
} else {
Toast.makeText(getActivity(), getResources().getString(R.string.failed_connect_network), Toast.LENGTH_SHORT).show();
}
break;
case 4:
if (JsonUtils.isNetworkAvailable(getActivity())) {
list.clear();
new MyTask().execute(Config.SERVER_URL + "/banko_api.php?d_o=0");
} else {
Toast.makeText(getActivity(), getResources().getString(R.string.failed_connect_network), Toast.LENGTH_SHORT).show();
}
break;
case 5:
if (JsonUtils.isNetworkAvailable(getActivity())) {
list.clear();
new MyTask().execute(Config.SERVER_URL + "/banko_api.php?d_o=1");
} else {
Toast.makeText(getActivity(), getResources().getString(R.string.failed_connect_network), Toast.LENGTH_SHORT).show();
}
break;
default:
if (JsonUtils.isNetworkAvailable(getActivity())) {
list.clear();
new MyTask().execute(Config.SERVER_URL + "/banko_api.php?d_o=0");
} else {
Toast.makeText(getActivity(), getResources().getString(R.string.failed_connect_network), Toast.LENGTH_SHORT).show();
}
break;
}
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
Calendar calendar = Calendar.getInstance();
Date today = calendar.getTime();
calendar.add(Calendar.DAY_OF_YEAR, -1);
Date yesterday = calendar.getTime();
calendar = Calendar.getInstance();
calendar.add(Calendar.DAY_OF_YEAR, 1);
Date tomorrow = calendar.getTime();
DateFormat dateFormat = new SimpleDateFormat("dd/MM EEE");
String todayAsString = dateFormat.format(today);
String tomorrowAsString = dateFormat.format(tomorrow);
String yesterdayAsString = dateFormat.format(yesterday);
// Spinner Drop down elements
List<String> categories = new ArrayList<String>();
categories.add(yesterdayAsString);
categories.add(todayAsString);
categories.add(tomorrowAsString);
// Creating adapter for spinner
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(getContext(), R.layout.spinner_item, categories);
dataAdapter.setDropDownViewResource(R.layout.spinner_dropdown_item);
// attaching data adapter to spinner
spinner.setAdapter(dataAdapter);
spinner.setSelection(4);
The problem : first load of the app is calling the data of today (which is the default choice in my spinner) without any problem.
if i choose another element in the spinner it also calls the related data without problem.
now if I want to select back today element in the spinner no data will be brought from the server even when the app at the start up it calls data from the same link and get it.
I get this message in my log :
W/System.err: org.json.JSONException: Value [] of type org.json.JSONArray cannot be converted to JSONObject
The onPostExcute of my Asynktask contains this code:
#Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
if (null != progressDialog && progressDialog.isShowing()) {
progressDialog.dismiss();
}
if (null == result || result.length() == 0) {
Toast.makeText(getActivity(), getResources().getString(R.string.failed_connect_network), Toast.LENGTH_SHORT).show();
} else {
try {
Log.d("resultTT",result);
JSONObject mainJson = new JSONObject(result);
JSONArray jsonArray = mainJson.getJSONArray(JsonConfig.CATEGORY_ARRAY_NAME);
JSONObject objJson = null;
for (int i = 0; i < jsonArray.length(); i++) {
objJson = jsonArray.getJSONObject(i);
ItemMatch objItem = new ItemMatch();
objItem.setMatchId(objJson.getString(JsonConfig.Match_ID));
objItem.setMatchTournamentName(objJson.getString(JsonConfig.Match_LEAGUE_NAME));
objItem.setMatchTime(objJson.getString(JsonConfig.Match_TIME));
objItem.setMatchStatus(objJson.getString(JsonConfig.Match_STATUS));
objItem.setMatchLocalTeamName(objJson.getString(JsonConfig.Match_LOCALTEAM_NAME));
objItem.setMatchVisitorTeamName(objJson.getString(JsonConfig.Match_VISITORTEAM_NAME));
objItem.setMatchLocalTeamGoals(objJson.getString(JsonConfig.Match_LOCALTEAM_GOALS));
objItem.setMatchVisitorTeamGoals(objJson.getString(JsonConfig.Match_VISITORTEAM_GOALS));
objItem.setMatchBestOddPercent(objJson.getString(JsonConfig.Match_BEST_ODD_PERCENT));
objItem.setMatchBestOddResult(objJson.getString(JsonConfig.Match_BEST_ODD_RESULT));
list.add(objItem);
}
} catch (JSONException e) {
e.printStackTrace();
}
for (int j = 0; j < list.size(); j++) {
object = list.get(j);
array_match_id.add(String.valueOf(object.getMatchId()));
str_match_id = array_match_id.toArray(str_match_id);
array_league_name.add(String.valueOf(object.getMatchTournamentName()));
str_league_name = array_league_name.toArray(str_league_name);
array_match_time.add(String.valueOf(object.getMatchTime()));
str_match_time = array_match_time.toArray(str_match_time);
array_match_status.add(String.valueOf(object.getMatchStatus()));
str_match_status = array_match_status.toArray(str_match_status);
array_match_localteam_name.add(object.getMatchLocalTeamName());
str_match_localteam_name = array_match_localteam_name.toArray(str_match_localteam_name);
array_match_visitorteam_name.add(object.getMatchVisitorTeamName());
str_match_visitorteam_name = array_match_visitorteam_name.toArray(str_match_visitorteam_name);
array_match_localteam_goals.add(object.getMatchLocalTeamGoals());
str_match_localteam_goals = array_match_localteam_goals.toArray(str_match_localteam_goals);
array_match_visitorteam_goals.add(object.getMatchVisitorTeamGoals());
str_match_visitorteam_goals = array_match_visitorteam_goals.toArray(str_match_visitorteam_goals);
array_match_best_odd_percent.add(object.getMatchBestOddPercent());
str_match_best_odd_percent = array_match_best_odd_percent.toArray(str_match_best_odd_percent);
array_match_best_odd_result.add(object.getMatchBestOddResult());
str_match_best_odd_result = array_match_best_odd_result.toArray(str_match_best_odd_result);
}
setAdapterToListView();
}
In the try section of this code u can see I make a log of the result to see what is coming from the server i just get this : D/resultTT: []
and as you see the try is inside the else section so in the if statement of this section i check if the result is null or empty ; but the code passes it and enter the else statement but still showing that the returned result array is empty.
I want some help to find the reason behind this empty returned array even it loads fine at the start up. why can not it get the information after I choose any element in the spinner and then come back to the default (today) element?
UPDATE : this is my php side-server api code
<?php
include_once ('includes/variables.php');
DEFINE ('DB_HOST', $host);
DEFINE ('DB_USER', $user);
DEFINE ('DB_PASSWORD', $pass);
DEFINE ('DB_NAME', $database);
$mysqli = #mysql_connect (DB_HOST, DB_USER, DB_PASSWORD) OR die ('Could not connect to MySQL');
#mysql_select_db (DB_NAME) OR die ('Could not select the database');
?>
<?php
mysql_query("SET NAMES 'utf8'");
$date_offset = mysql_real_escape_string($_GET[d_o]);
//$date_offset = 0;
if(empty($date_offset) || $date_offset == "0")
{
$date_offset_value = "0";
$query="SELECT a.*, m.match_id, m.match_time, m.en_tournament_name FROM app_banko a inner join matches_of_comments m on m.match_id = a.match_id where a.date_offset = $date_offset_value limit 20";
$resouter = mysql_query($query);
}
else
{
$date_offset_value = $date_offset;
$query="SELECT a.*, m.match_id, m.match_time, m.en_tournament_name FROM app_banko a inner join matches_of_comments m on m.match_id = a.match_id where a.date_offset = $date_offset_value limit 20";
$resouter = mysql_query($query);
}
$set = array();
$total_records = mysql_num_rows($resouter);
if($total_records >= 1){
while ($link = mysql_fetch_array($resouter, MYSQL_ASSOC)){
$set['NewsApp'][] = $link;
}
}
echo $val= str_replace('\\/', '/', json_encode($set));
?>

If you get an array in return when expecting an object, there might be something wrong with the request to the API. One way is to figure it out it set up Wireshark on the development machine to sniff and filter the traffic. Then you can see if your request is faulty.

It is possible that the value of the response argument from the onPostExecute method contains stringified JSONArray, not JSONObject.
You can always test this with:
try:
JSONArray jsonArray = new JSONArray(result);
catch(JSONException e) {
// String `result` is not an array. Parse it as a regular JSONObject.
}
Testing wheter string is an empty json array (depends on it's formatting, especially when it may contain some white characters) checking it's length might be a pretty bad idea.
It all depends how are determined an API endpoints that you are calling.
One more tip at the end. If you are planning to consume REST API I strongly recommend using:
Retrofit - which allows you to easily define interfaces to access your API,
GSON - to automatically convert responses for Java models.

Your result string is an empty array but not an empty string. The empty array is represented as the following string:
String result = "[]";
In that case result.length() is equal to 2.
When parsing JSON you need to know if the parsed object is of type Object or of type Array. The former one is wrapped with braces {}, the later one with square brackets [].
So the following line:
JSONObject mainJson = new JSONObject(result);
Should probably be:
JSONArray mainJson = new JSONArray(result);
But I cannot emphasize enough that you need to know what your API returns if you want to be able to parse it correctly.
EDIT:
Well, json_encode will have a hard time to guess whether it should create a JSON Array or a JSON Object out of the empty array that you created with $set = array();.
Adding objects to the array like you do in your loop makes it obvious for json_encode that it should create a JSON Object.
I don't know if you can force json_encode's behavior, but worst case you could check yourself if the array is empty and return "" or null if the array is empty.
$set = array();
$total_records = mysql_num_rows($resouter);
if ($total_records >= 1) {
while ($link = mysql_fetch_array($resouter, MYSQL_ASSOC)) {
$set['NewsApp'][] = $link;
}
echo $val= str_replace('\\/', '/', json_encode($set));
} else {
echo $val="";
}

please put a check result.isEmpty() in your try block condition may this could solve your problem.

you can not directly get response in string . it can use JSONObject and JSONArray.

Storing String Array as JSON Array then getting Ljava.lang.String# when trying to receive and set TextView as value

Right now i am pulling a value from a EditText MainActivity and putting that as at string in sharedpref. In a later activity I am receiving that value and trying to add it to the end of an array that is contunially growing. To store the Array in that later activity for receiving later to continue adding I used a JSON array. So basically I create a String Array when the counter is 0 (first input the user has done since clearing) and receive the string value from the MainActivity EditText and add that as the first value in the String Array and then store it as a JSON Array. When I receive it later (when counter is > 0) and convert it back to string Array, the outPut in my TextView for any given spot in the array is [L.java.lang.String;#42a5e438,. Below is my code for both if coutner == 0 and counter >0; Does anyone know what the solution is?
int placeCounterExplanation = pref.getInt("placeCounterExplanation",0);
//getting new item
String explanationItem = pref.getString("explanationItem",null);
if(placeCounterExplanation > 0){
///////////////////////////////////// RECEIVE//
//pull existing array
JSONArray explanationjArray;
try {
explanationjArray = new JSONArray(settings.getString("jArray", ""));
//converting from json back to workable string array
// String []ExplanationDetailArray = new String[explanationjArray.length()];
String []ExplanationDetailArray = new String[100];
//matching them/converting
for(int i = 0, count = explanationjArray.length(); i<= count; i++)
{
try {
String jsonString = explanationjArray.getString(i);
ExplanationDetailArray[i] = jsonString;
}
catch (JSONException e) {
e.printStackTrace();
}
}
//after matching^ it adds newest value
ExplanationDetailArray[placeCounterExplanation] = explanationItem;
////////////////////////////////////////////////////////////////////////
Intent i = getIntent();
// getting attached intent data
String product = i.getStringExtra("product");
// displaying selected product name
txtProduct.setText(product);
if (product.equals("Alcohol")){
test.setText(ExplanationDetailArray[0]);
String placeCount = Integer.toString(placeCounterExplanation);
test2.setText(ExplanationDetailArray[1]);
// test3.setText(placeCounterExplanation - 1);
}
//////////////////////////////////////////////////////////////////////////
/////STORE
explanationjArray.put(Arrays.toString(ExplanationDetailArray));
// explanationjArray.put(ExplanationDetailArray);
editor2.putString("jArray", explanationjArray.toString());
editor2.commit();
} catch (JSONException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
if (placeCounterExplanation == 0){
ExplanationDetailArray = new String[100];
ExplanationDetailArray[0] = explanationItem;
JSONArray explanationjArray = new JSONArray();
//////////////////////////////
// String sC = Integer.toString(spotCounter);
Intent i = getIntent();
// getting attached intent data
String product = i.getStringExtra("product");
// displaying selected product name
txtProduct.setText(product);
if (product.equals("Alcohol")){
test.setText(ExplanationDetailArray[0]);
// test2.setText(ExplanationDetailArray[1]);
// test3.setText(placeCounterExplanation - 1);
}
///////////////////////////////
//STORING MIGHT NOT NEED THIS INSIDE HERE
// explanationjArray.put(ExplanationDetailArray);
explanationjArray.put(Arrays.toString(ExplanationDetailArray));
editor2.putString("jArray", explanationjArray.toString());
editor2.commit();
// placeCounterExplanation = placeCounterExplanation + 1;
// editor.putInt("placeCounterExplanation",placeCounterExplanation);
//editor.commit();
}
//after either IF Statement catches teh program, it advances the counter.
placeCounterExplanation = placeCounterExplanation + 1;
editor.putInt("placeCounterExplanation",placeCounterExplanation);
editor.commit();

I believe your problem is coming from the following line in code :
explanationjArray.put(ExplanationDetailArray);
This will insert a textual representation of the object into the JSON array. Instead you can do :
explanationjArray.put(Arrays.toString(ExplanationDetailArray));
or your own implementation of converting the string array to a concatenated set of strings.

how to show json array as html in textview

i want to show json in html tag below mycode im getting json and show in two diffrent textview but i want to show in single lines and show all getJSONObject(i).getString("name")); name in bold color and all getJSONObject(i).getString( "sub_ingredients")); in simple text do not want to use two textview i want toshow insingle text view what wil ido? i want to show as html tag
"dish_ingredient":
[
{"name":"Salt","sub_ingredients":""},
{"name":"Sesame Seeds","sub_ingredients":""},
{"name":"Calcium Sulfate","sub_ingredients":""},
{"name":"Brown Sugar","sub_ingredients":""},
{"name":"Salt","sub_ingredients":""},
{"name":"Hamburger Bun","sub_ingredients":""},
{"name":"Cheese-cultured pasteurized milk","sub_ingredients":""},
{"name":"Hamburger Bun","sub_ingredients":"Wheat, Niacin, Eggs"}]}
final LinearLayout table3 = (LinearLayout) findViewById(R.id.table3);
JSONArray school5 = json2.getJSONArray("dish_ingredient");
for (int i = 0; i < school5.length(); i++) {
row4 = getLayoutInflater().inflate(R.layout.row2, null);
((TextView) row4.findViewById(R.id.name)).setText(school5
.getJSONObject(i).getString("name"));
((TextView) row4.findViewById(R.id.subingredients))
.setText(school5.getJSONObject(i).getString( "sub_ingredients"));
table3.addView(row4);
}

If I understand correctly you want to display the JSON as formatted above in one TextView but with certain highlighting. Check out this post. If you want to keep the JSON in its original format I would just get the initial JSONArray, call toString(), and then replace the words "name" and "sub-ingredient" with text fomatted the way you want.
If I misunderstood and you want to extract the values for each JSONObject you just need to loop through the JSONArray
//format these to look like whatever you want
SpanableString nameTitle = "Name: "
SpanableString subIngredientTitle = " Sub-ingredient: ";
String concatProduct = "";
int arraySize = jsonArray.length();
for(int i = 0; i < arraySize; i++){
JSONObject thing = jsonArray.getJSONObject(i);
String name = thing.getString("name");
String subIngredient = thing.getString("sub-ingredient");
if(i == 0){
concatProduct = nameTitle + name + subIngredientTitle + subIngredient;
} else {
concatProduct += " " + nameTitle + name + subIngredientTitle + subIngredient;
}
}
textView.setText(concatProduct);
Something like this would let you process the JSONArray and build one string that you could set to one TextView. The formatting is up to you.