How To Parse Multiple Rows With Jsonoject
I am fetching data from mysql using php API and i pass results to android with Json_encode but when i populate results to android listview i get only one first row. This is reuslt
Solution 1:
You have initialized collection in wrong place, Please have look at following code this may help you
ArrayList<HashMap<String, String>> wordList;
wordList = newArrayList<HashMap<String, String>>();
for (int i = 0; i < response.length(); i++) {
try {
JSONObject jObj = newJSONObject(response);
boolean error = jObj.getBoolean("error");
// Check for error node in jsonif (!error) {
// user successfully exist in databaseJSONObject user = jObj.getJSONObject("user");
String paid_amount = user.getString("paid_amount");
String parking_duration =
user.getString("parking_duration");
String parking_name = user.getString("parking_name");
HashMap<String, String> prodHashMap = newHashMap<String, String>();
prodHashMap.put("paid_amount", paid_amount);
prodHashMap.put("parking_duration", parking_duration);
prodHashMap.put("parking_name", parking_name);
wordList.add(prodHashMap);
;
progressBarList.setVisibility(View.GONE);
}
userList = wordList ;
ShowListData()
Solution 2:
You aren't getting just one row, you're creating a new ArrayList through every iteration. You'll only ever get the last row this way.
ArrayList<HashMap<String, String>> wordList;
wordList = newArrayList<HashMap<String, String>>();
You need to initialize your list outside your for loop.
ArrayList<HashMap<String, String>> wordList = new ArrayList<HashMap<String, String>>();
for (int i = 0; i < response.length; i++) {
// add your information here
}
Edit::
I see what's happening. You're looping for the length of String. You need to convert your String response to a JSONArray and loop through that. This way you step through each JSONObject in the array
List<HashMap<String, String>> wordList = newArrayList<HashMap<String,String>>();
try {
JSONArray array = newJSONArray(response);
for (int i = 0; i < array.length(); i++) {
JSONObject jsonObject = array.getJSONObject(i);
// get user // do rest of work
}
} catch (JSONException e) {
e.printStackTrace();
}
Edit 2::
This should get you going. I haven't tested, so watch out for any missing brackets.
privatevoidGetParkingInfo(final String plate_no) {
// Tag used to cancel the requestString tag_string_req = "req_Verfication";
progressBarList.setVisibility(View.VISIBLE);
// myList.setVisibility(View.GONE);StringRequest strReq = newStringRequest(Request.Method.POST,
Urls.URL_driver_parking_information, newResponse.Listener<String>() {
@OverridepublicvoidonResponse(String response) {
Log.d(TAG, "cerfication Response: " + response.toString());
try {
JSONArray jsonArray = newJSONArray(response);
if (jsonArray != null && !jsonArray.length() > 0) {
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
if (!jsonObject.isNull("user")) {
JSONObject user = jsonObject.getJSONObject("user");
String paid_amount = user.getString("paid_amount");
String parking_duration =
user.getString("parking_duration");
String parking_name = user.getString("parking_name");
HashMap<String, String> prodHashMap = newHashMap<String, String>();
prodHashMap.put("paid_amount", paid_amount);
prodHashMap.put("parking_duration", parking_duration);
prodHashMap.put("parking_name", parking_name);
ArrayList<HashMap<String, String>> wordList;
wordList = newArrayList<HashMap<String, String>>();
wordList.add(prodHashMap);
userList = wordList ;
ShowListData();
progressBarList.setVisibility(View.GONE);
}
}
}
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(), "Json error: " +
e.getMessage(), Toast.LENGTH_LONG).show();
// // hiding the progress bar
progressBarList.setVisibility(View.GONE);
myList.setVisibility(View.VISIBLE);
}
}
}, newResponse.ErrorListener() {
@OverridepublicvoidonErrorResponse(VolleyError error) {
Log.e(TAG, "Verfication error Error: " + error.getMessage());
Toast.makeText(getApplicationContext(),
"response error", Toast.LENGTH_LONG).show();
// Toast.makeText(getApplicationContext(),// error.getMessage(), Toast.LENGTH_LONG).show();// hiding the progress bar
progressBarList.setVisibility(View.GONE);
myList.setVisibility(View.VISIBLE);
}
}) {
@OverrideprotectedMap<String, String> getParams() {
// Posting parameters to verfication urlMap<String, String> params = newHashMap<String, String>();
params.put("plate_no", plate_no);
return params;
}
};
// // Adding request to request queueAppController.getInstance().addToRequestQueue(strReq,tag_string_req);
}
Edit 3::
if ($usersArr != false) {
foreach($usersArras$user){
$subresponse["error"] = FALSE;
$subresponse["user"]["paid_amount"] = $user["paid_amount"];
$subresponse["user"]["parking_duration"] = $user["parking_duration"];
$subresponse["user"]["parking_name"] = $user["parking_name"];
$response[] = $subresponse;
$json = json_encode($response);
how I think it should look
if ($usersArr != false) {
foreach($usersArras$user){
$subresponse["error"] = FALSE;
$subresponse["user"]["paid_amount"] = $user["paid_amount"];
$subresponse["user"]["parking_duration"] = $user["parking_duration"];
$subresponse["user"]["parking_name"] = $user["parking_name"];
$response[] = $subresponse;
}
$json = json_encode($response);
Solution 3:
This solution will help anyone who needds to fetch data from mysql using where clause based to android input with volley library .
DBHandler which handles php functions :
.....
publicfunctiongetDriverHistory($plate_no) {
$stmt = $this->conn->prepare("SELECT * from drivers_history
where drivers_history.plate_no = ?");
$stmt->bind_param("s", $plate_no);
if ($stmt->execute()) {
// $user = $stmt->get_result()->fetch_assoc(); // $stmt->close();// return $user;$result = $stmt->get_result();
$usersArr = array();
while ($user = $result->fetch_assoc()){
$usersArr[] = $user;
}
$stmt->close();
return$usersArr;
} else {
returnNULL;
}
}
....
GetdriverFunction.php used to access function above :
...........
<?phpinclude'./DbHandler.php';
$db = new DBHandler();
// json response array$response = array("error" => FALSE);
if (isset($_POST['plate_no'])) {
// receiving the post params$plate_no = $_POST['plate_no'];
$usersArr = $db->getDriverHistory($plate_no);
if ($usersArr != false) {
$response["error"]= FALSE;
$response["user"] = $usersArr;
echo json_encode($response);
}
}
......
finally Java part method to fetch all results where plate_no equals to something plate_no :
privatevoidGetParkingInfo(final String plate_no) {
// Tag used to cancel the requestString tag_string_req = "req_Verfication";
progressBarList.setVisibility(View.VISIBLE);
// myList.setVisibility(View.GONE);StringRequest strReq = newStringRequest(Request.Method.POST,
Urls.URL_driver_parking_information, newResponse.Listener<String>() {
@OverridepublicvoidonResponse(String response) {
Log.d(TAG, "cerfication Response: " + response.toString());
// Parsing jsonJSONArray jsonArrayResult ;
for (int i = 0; i < response.length(); i++) {
try {
JSONObject jObj = newJSONObject(response);
boolean error = jObj.getBoolean("error");
// Check for error node in jsonif (!error) {
// user successfully exist in database
jsonArrayResult = jObj.getJSONArray("user");
for(int x=0; x<jsonArrayResult.length();x++){
JSONObject json = jsonArrayResult.getJSONObject(x);
String paid_amount = json.getString("paid_amount");
String parking_duration =
json.getString("parking_duration");
String parking_name = json.getString("parking_name");
HashMap<String, String> prodHashMap = newHashMap<String, String>();
prodHashMap.put("paid_amount", paid_amount);
prodHashMap.put("parking_duration", parking_duration);
prodHashMap.put("parking_name", parking_name);
ArrayList<HashMap<String, String>> wordList;
wordList = newArrayList<HashMap<String, String>>();
wordList.add(prodHashMap);
userList = wordList ;
}
ShowListData();
progressBarList.setVisibility(View.GONE);
}
else{
// Error in login. Get the error message// // hiding the progress bar
progressBarList.setVisibility(View.GONE);
myList.setVisibility(View.VISIBLE);
String errorMsg = jObj.getString("error_msg");
Toast.makeText(getApplicationContext(), errorMsg,
Toast.LENGTH_LONG).show();
}
} catch (JSONException e) {
// JSON error
e.printStackTrace();
Toast.makeText(getApplicationContext(), "Json error: " +
e.getMessage(), Toast.LENGTH_LONG).show();
// // hiding the progress bar
progressBarList.setVisibility(View.GONE);
myList.setVisibility(View.VISIBLE);
}
}
}
}, newResponse.ErrorListener() {
@OverridepublicvoidonErrorResponse(VolleyError error) {
Log.e(TAG, "Verfication error Error: " + error.getMessage());
Toast.makeText(getApplicationContext(),
"response error", Toast.LENGTH_LONG).show();
// Toast.makeText(getApplicationContext(),// error.getMessage(), Toast.LENGTH_LONG).show();// hiding the progress bar
progressBarList.setVisibility(View.GONE);
myList.setVisibility(View.VISIBLE);
}
}) {
@OverrideprotectedMap<String, String> getParams() {
// Posting parameters to verfication urlMap<String, String> params = newHashMap<String, String>();
params.put("plate_no", plate_no);
return params;
}
};
// // Adding request to request queueAppController.getInstance().addToRequestQueue(strReq,tag_string_req);
}
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