In my android app, I am creating a function to convert to json object.
this is the code
JSONArray jsonArr = new JSONArray();
for (Modificateurs mod : this.getModificateurs()) {
JSONObject pnObj = new JSONObject();
pnObj.put(Artifact.JSON_MODIFICATEUR, mod.getModificateur());
pnObj.put(Artifact.JSON_DATEMODIFICATION, mod.getDateModification());
jsonArr.put(pnObj);
}
object.putOpt(Artifact.JSON_MODIFICATEURS, jsonArr);
Now i create this function to convert this json object but it still not working.
JSONArray jsonArr = object.getJSONArray(Artifact.JSON_MODIFICATEURS);
for (int i = 0; i < jsonArr.length(); i++) {
JSONObject objet = jsonArr.getJSONObject(i);
String modificateur = objet.optString(Artifact.JSON_MODIFICATEUR);
String date = objet.optString(Artifact.JSON_DATEMODIFICATION);
Modificateurs mod = new Modificateurs(modificateur, date);
mods.add(mod);
}
this.modificateurs=mods;
What's wrong in my function?
Regarding the comments, if your application crashes at line
for (Modificateurs mod : this.getModificateurs()) {
I guess it's a NullPointerException and this.getModificateurs() is returning null.
You have to check the nullity before iterating :
if (this.getModificateurs() != null) {
for (Modificateurs mod : this.getModificateurs()) {
...
Related
I am fetching data from JSON to android.But, I am getting an empty JSON response. The PHP code which generates JSON data is as follows:
$result = $conn->query("SELECT dbname FROM users ORDER BY dbname ASC");
//defined second array for dbnames' list
$dblist = array();
while($row = $result->fetch_assoc()){
//array_push($response['dblist'],$row['dbname']);
$dblist[] = array('name'=>$row['dbname']);
}
$response['dblist'] = $dblist;
This is the JSON response.
{"dblist":[{"name":"a"},{"name":"arsod"}]}
The Java code to fetch data in android is as follows:
JSONObject obj = new JSONObject(s);
JSONArray names = obj.getJSONArray("dblist");
for(int i=0; i < names.length(); i++) {
JSONObject n = names.getJSONObject(i);
String name = n.getString("name");
Toast.makeText(MainActivity.this, name, Toast.LENGTH_SHORT).show();
institutes.add(name);
}
where institutes is an ArrayList in which I want to add each fetched element. But while fetching the data, I get the error in logcat org.json.JSONException: End of input at character 0 of. What is going wrong?
Considering the following:
s = {"dblist":[{"name":"a"},{"name":"arsod"}]}
Your code should be like,
JSONObject obj = new JSONObject(s);
JSONArray names = obj.getJSONArray("dblist");
for(int i=0; i < names.length(); i++) {
JSONObject n = names.getJSONObject(i);
String name = n.getString("name");
Toast.makeText(MainActivity.this, name, Toast.LENGTH_SHORT).show();
institutes.add(name);
}
remove this line:
JSONObject object = obj.getJSONObject("dblist");
and replace all occurences of object. with obj.
your JSONObject obj doesn't contain "dblist" object, there is only array inside it, so you should look for getJSONArray("dblist") straight inside obj
edit: you are parsing different String s, I've just checked this code:
final String s = "{\"dblist\":[{\"name\":\"a\"},{\"name\":\"arsod\"}]}";
JSONObject obj = new JSONObject(s);
JSONArray names = obj.getJSONArray("dblist");
for (int i = 0; i < names.length(); i++) {
JSONObject n = names.getJSONObject(i);
String name = n.getString("name");
Toast.makeText(this, name, Toast.LENGTH_SHORT).show();
}
which is almost exacly same as your and works pretty fine...
[{"UserID":"vishi"},{"UserID":"vish"}]
this is the json data that I am sending from php...
how can i get these values with same name in android
Thanks,
JSONArray array = new JSONArray(...);
int length = array.length() ;
for (int i = 0; i < length; i++) {
JSONObject obj = array.optJSONObject(i);
if (obj != null) {
String userId = obj.optString("UserID");
}
}
[
{
"UserID": "vishi" // key is UserId. value is vishi
},
{
"UserID": "vish"
}
]
The key UserID is the same. Just loop through the array and get the value
ArrayList<String> list = new ArrayList<String>();
JSONArray jr = new JSONArray("your json");
for(int i=0i<jr.length();i++)
{
JSONObject jb = jr.getJSONObject(i);
String value= jb.getString("UserID");
list.add(value);
}
Note:
Blackbelt's answer will also work and it also has null check cause optJSONObject() could return null also. This is a better way
Drawing from blackbelt's answer
JSONObject obj = array.optJSONObject(i);
if (obj != null) {
String userId = obj.optString("UserID");
}
From the docs
public JSONObject optJSONObject (String name)
Added in API level 1
Returns the value mapped by name if it exists and is a JSONObject. Returns null otherwise.
Here is the
string one =[{"ID":5,"Name":"Sai"}]
how i get only id and name from this string
Matcher matcher = Pattern.compile("\\[([^\\]]+)").matcher(one);
List<String> tags = new ArrayList<String>();
int pos = -1;
while (matcher.find(pos+1)){
pos = matcher.start();
tags.add(matcher.group(1));
}
System.out.println("getting data"+tags);
i tried this but it didn't work
List<String> ls = new ArrayList<String>(one);
JSONArray array = new JSONArray();
for(int i = 0; i< array.length(); i++){
JSONObject obj = array.getJSONObject(i);
ls.add(obj.getString("Name"));
}
It's JSON format and it can very easily be read in Android. Here is the sample code:
JSONArray array = new JSONArray(one);
int length = array.length();
for(int i=0;i< length; i++)
{
JSONObject temp = array.getJSONObject(i);
System.out.println(temp.getString("ID"));
System.out.println(temp.getString("Name"));
}
This format of data is called JSON.
Have a look at Go to http://json.org/, scroll to (almost) the end, click on one of the many Java libraries listed.
First of all, your string initialization is wrong.
Wrong:
string one =[{"ID":5,"Name":"Sai"}]
Correct:
String one ="[{\"ID\":5,\"Name\":\"Sai\"}]";
Second, its a JSON formatted data so you can parse it using JSONArray and JSONObject classes, instead of creating any pattern.
Now, in your case its JSONObject inside JSONArray so initially create an object of JSONArray using your string.
For example:
JSONArray arrayJSON = new JSONArray(one); // 'one' is your JSON String
for(int i=0; i<arrayJSON.length(); i++) {
JSONObject objJson = arrayJSON.getJSONObject(i);
String ID = objJson.getString("ID");
.....
.....
// same way you can fetch/parse any string/value from JSONObject/JSONArray
}
it is a json formate Date
use JsonObject class to parse this data
tutorial this
JSONArray jsonArray = new JSONArray("[{\"ID\":5,\"Name\":\"Sai\"}]");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject object = jsonArray.getJSONObject(i);
System.out.println(object.getString("ID"));
System.out.println(object.getString("Name"));
}
it gives me the error log : " org.json.JSONException: No value for tableData"
try {
JSONObject mainJson22 = new JSONObject(reply);
JSONObject jsonResult = mainJson22.getJSONObject("UserListByBusinessAreaContextResult");
JSONArray jsonArray22 = jsonResult.getJSONArray("tableData");
// JSONArray jsonArray22 = mainJson22.getJSONArray("UserListByBusinessAreaContextResult"); // JSONArray jsonArray22 = jsonResult.getJSONArray("tableData"); Log.i("mainjson234","" + jsonArray22);
for (int i2 = 0; i2 < jsonArray22.length(); i2++) {
JSONObject objJson22 = jsonArray22.getJSONObject(i2);
the error is on line : `"JSONArray jsonArray22 = jsonResult.getJSONArray("tableData");"
heres the json:
{
"UserListByBusinessAreaContextResult": "{\"tableData\":[{\"UserID\":30,\"Username\":\"Teste\",\"Name\":\"Teste\"}]}"
}
The object UserListByBusinessAreaContextResult contains a string. This string is:
"{\"tableData\":[{\"UserID\":30,\"Username\":\"Teste\",\"Name\":\"Teste\"}]}"
Do you notice the quotes? The problem is, that your WCF service returns a JSON string, not an object. So either you will have to change the WCF service to deliver an object instead, or parse that string again. Like this (not tested):
JSONObject mainJson22 = new JSONObject(reply);
JSONObject tableData = new JSONObject(
mainJson22.getString("UserListByBusinessAreaContextResult"));
In my app, i want to parse json response which is in the format
{"quote":[{"orderId":"3209926"},{"totalpages":1}]}
below is the code which i had done,But the problem is how to get the "totalpages" value?
try {
JSONObject jObject = new JSONObject(result);
JSONArray jArray = jObject.getJSONArray("quote");
for (int i = 0; i < jArray.length(); i++)
{
JSONObject offerObject = jArray.getJSONObject(i);
current.orderId = offerObject.getInt("orderId");
It shows error when i use
current.totalpage= offerObject.getInt("totalpages");
Anybody knows how to parse this?THanks in advance
Note that getInt(), like other get-functions of JSONObject throw JSONException if the object does not contain the key requested. Thus, before you request the key you should use hasKey() to determine whether the object contains the key.
For example, inside the for loop you can do the following:
JSONObject offerObject = jArray.getJSONObject(i);
if(offerObject.has("orderId") {
current.orderId = offerObject.getInt("orderId");
}
if(offerObject.has("totalpages") {
current.totalpage= offerObject.getInt("totalpages");
}
You can also add a flag and a check after the loop to ensure that both orderId and totalpages were present in the JSON data.
I dont know why your json is having that structure. But if you want to parse it then you will have to do something like the following with the has function.
for (int i = 0; i < jArray.length(); i++) {
JSONObject offerObject = jArray.getJSONObject(i);
if(offerObject.has("orderId")) {
current.orderId = offerObject.getInt("orderId");
} else if(offerObject.has("totalpages")) {
current.totalpage= offerObject.getInt("totalpages");
}
}