I have made a JSONParse class for parsing JSON response. I have to call 3 web services. But I want to use only that SINGLE class for parsing JSON response for all 3 web services. All 3 web services has different keys and values. What I have done is like below..
MainActivity.java
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {
// Anything Else Goes Here
private ArrayList<ModelCourse> ArrayListModelCourses;
// Variables
private String url = "stream.php";
private String career_path = "";
// Widgets
private ListView lv;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
private void init() {
initialisation();
find_view_by_id();
clickListners();
fetchData();
}
private void initialisation() {
ArrayListModelCourses = new ArrayList<>();
}
private void find_view_by_id() {
lv = (ListView) findViewById(R.id.list_view);
}
private void clickListners() {
lv.setOnItemClickListener(this);
}
private void fetchData() {
StringRequest stringReq = new StringRequest(Request.Method.POST, Constants.base_url + url, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONObject jo = new JSONObject(response);
if (jo.has("success")) {
JsonParse jsonParse = new JsonParse(response);
ArrayListModelCourses = jsonParse.parseJson();
} else {
Toast.makeText(MainActivity.this, "Error msg from server!!", Toast.LENGTH_LONG).show();
}
} catch (JSONException e) {
e.printStackTrace();
}
CustomAdapter ca = new CustomAdapter(getApplicationContext(), ArrayListModelCourses);
lv.setAdapter(ca);
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(MainActivity.this, "Error:" + error.getMessage(), Toast.LENGTH_LONG).show();
}
}) {
#Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put("user_id", "51");
return params;
}
};
RequestQueue queue = Volley.newRequestQueue(this);
queue.add(stringReq);
}
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
String stream_name = ArrayListModelCourses.get(position).getmCourse_name();
String stream_id = ArrayListModelCourses.get(position).getmCourse_id();
career_path += stream_name + ", ";
fetchData();
}
}
JsonParse.java - The single class that I want to use for 3 web services.
public class JsonParse {
// Anything Else Goes Here
ArrayList<ModelCourse> modelCourses = new ArrayList<>();
// Variables
public static final String KEY_ARRAY = "stream_name";
public static final String KEY_ID = "stream_id";
public static final String KEY_NAME = "stream_name";
private String mJsonRes;
public JsonParse(String jsonRes) {
this.mJsonRes = jsonRes;
}
public ArrayList<ModelCourse> parseJson() throws JSONException {
JSONObject jo = new JSONObject(mJsonRes);
JSONArray ja = jo.getJSONArray(KEY_ARRAY);
for (int i = 0; i < ja.length(); i++) {
ModelCourse modelCourseObj = new ModelCourse();
JSONObject object = ja.getJSONObject(i);
modelCourseObj.mCourse_id = object.getString(KEY_ID);
modelCourseObj.mCourse_name = object.getString(KEY_NAME);
modelCourses.add(modelCourseObj);
}
return modelCourses;
}
}
Thanks in advance.
Use can use Gson for mapping json data to objects.
Create models classes for your json data. (use link http://www.jsonschema2pojo.org/)
Now in your MainActivity onResponse() method pass the string response to JsonParse class.
In JsonParse class parse your json data
Gson gson = new Gson();
gson.fromJson(jsonString, JsonModelRootClassName.class);
You can create one method to get "JsonModelRootClassName" based on your web services call.
Related
server data
android data
I am passing arraylist of srid of all element and post to server using volley request.enter image description here
here is the code
public class AttendenceShowStdList extends AppCompatActivity {
ActivityAttendenceShowStdListBinding AttendenceShowStdList;
ArrayList<AttStdListModel> userlist = new ArrayList<>();
ArrayList<AllStdListsrIdAdmIdModel> list= new ArrayList<>();
ArrayList<AllStdListModel> stdlist = new ArrayList<>();
AttStdListAdapter adapter;
private DatePickerDialog datePickerDialog;
private String date,clid,sectionId,yrId,instId,usid,usType,attdate;
SharedPreferences sharedPreferences_teach;//staff shareprefferece for profile fetch
private static final String SHARED_PREF_NAME_TEACH="myprefteach";
private static final String Key_USID_TEACH = "techusid";
private static final String Key_INSTID_TEACH = "techinstid";
private static final String Key_USTYPE_TEACH = "techustype";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
AttendenceShowStdList= ActivityAttendenceShowStdListBinding.inflate(getLayoutInflater());
setContentView(AttendenceShowStdList.getRoot());
sharedPreferences_teach =getSharedPreferences(SHARED_PREF_NAME_TEACH, Context.MODE_PRIVATE);
instId=sharedPreferences_teach.getString(Key_INSTID_TEACH,null);
usid=sharedPreferences_teach.getString(Key_USID_TEACH,null);
usType=sharedPreferences_teach.getString(Key_USTYPE_TEACH,null);
//getting data from TakeAttendenceAdapter cardview
clid=getIntent().getExtras().getString("ClassId");
sectionId=getIntent().getExtras().getString("sectionId");
Log.d("cliddd",clid);
yrId=getIntent().getExtras().getString("YearId");
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
date = sdf.format(new Date());
Log.d("dttt",date);
userlist = (ArrayList<AttStdListModel>) getModel(false);
adapter = new AttStdListAdapter(this,userlist);
AttendenceShowStdList.rvstdlist.setAdapter(adapter);
AttendenceShowStdList.rvstdlist.setLayoutManager(new LinearLayoutManager(getApplicationContext(), LinearLayoutManager.VERTICAL, false));
// recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
// recyclerView.setHasFixedSize(true);
getData();
//toolbar
setSupportActionBar(AttendenceShowStdList.toolbar);
Objects.requireNonNull(getSupportActionBar()).setDisplayShowHomeEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
AttendenceShowStdList.submit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
submitAttendence();
// Intent intent = new Intent(AttendenceShowStdList.this,SubmitAttendenceActivity.class);
// startActivity(intent);
}
});
}
private List<AttStdListModel> getModel(boolean isSelect){
List<AttStdListModel> list = new ArrayList<>();
for(int i = 0; i < list.size(); i++){
AttStdListModel model = new AttStdListModel();
model.setSelected(isSelect);
// model.setStud_name(String.valueOf(list.get(i)));
model.setAdmi_id(String.valueOf(list.get(i)));
list.add(model);
}
return list;
}
private void getData() {
RequestQueue queue = Volley.newRequestQueue(getApplicationContext());
String url1="https://comzent.in/wonderschoolerp/apis/teacher/get_studteachers_att.php";
StringRequest request = new StringRequest(Request.Method.POST, url1, new com.android.volley.Response.Listener<String>() {
#SuppressLint("NotifyDataSetChanged")
#Override
public void onResponse(String response) {
// Toast.makeText(getContext(), "Data added to API", Toast.LENGTH_SHORT).show();
try {
JSONObject respObj = new JSONObject(response);
JSONArray jsonArray5=respObj.getJSONArray("studatt_details");
Log.d("std details",jsonArray5.toString());
for(int i=0;i<jsonArray5.length();i++){
JSONObject jsonObject=jsonArray5.getJSONObject(i);
String sr_id=jsonObject.optString("sr_id");
String admi_id=jsonObject.optString("admi_id");
String stud_name=jsonObject.optString("stud_name");
String stud_phone=jsonObject.optString("stud_phone");
String stud_email=jsonObject.optString("stud_email");
String attd_status=jsonObject.optString("attd_status");
String attd_reason=jsonObject.optString("attd_reason");
userlist.add(new AttStdListModel(sr_id,admi_id,stud_name,stud_phone,stud_email,
attd_status,attd_reason));
Log.d("s", String.valueOf(userlist));
list.add(new AllStdListsrIdAdmIdModel(sr_id,admi_id,stud_name,stud_phone,stud_email,
attd_status,attd_reason));
}
} catch (JSONException e) {
e.printStackTrace();
}
adapter=new AttStdListAdapter(getApplicationContext(),userlist);
AttendenceShowStdList.rvstdlist.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
}, new com.android.volley.Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(), "Fail to get response = " + error, Toast.LENGTH_SHORT).show();
}
}) {
#Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put("get_studattd","1");
params.put("us_id",usid);
params.put("inst_id",instId);
params.put("class_id",clid);
params.put("sec_id",sectionId);
params.put("ay_id",yrId);
params.put("stud_attend_date",date);
return params;
}
};
queue.add(request);
}
//submit attendence
private void submitAttendence() {
RequestQueue queue = Volley.newRequestQueue(getApplicationContext());
String url1="https://comzent.in/wonderschoolerp/apis/teacher/take_studteacher_att.php";
StringRequest request = new StringRequest(Request.Method.POST, url1, new com.android.volley.Response.Listener<String>() {
#Override
public void onResponse(String response) {
// Toast.makeText(getContext(), "Data added to API", Toast.LENGTH_SHORT).show();
try {
JSONObject respObj = new JSONObject(response);
String msg=respObj.getString("message");
Toast.makeText(AttendenceShowStdList.this, msg, Toast.LENGTH_LONG).show();
Log.d("response msg",msg);
if(msg.equals("Attendance Generated Successfully..!")){
finish();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new com.android.volley.Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(), "Fail to get response = " + error, Toast.LENGTH_LONG).show();
Log.d("error msg", String.valueOf(error));
}
}) {
#Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
ArrayList<String> allstdsrid = new ArrayList<String>();
for(int i=0; i < list.size(); i++) {
allstdsrid.add(String.valueOf(list.get(i).getSr_id()));
}
params.put("sr_id", String.valueOf(allstdsrid));
Log.d("params", String.valueOf(params));
Log.d("allstudentsrid", String.valueOf(allstdsrid));
ArrayList<String> allstdadmid = new ArrayList<String>();
for(int i=0; i < list.size(); i++) {
allstdadmid.add(list.get(i).getAdmi_id());
params.put("admission_id", String.valueOf(allstdadmid));
}
Log.d("allstudentsadmid", String.valueOf(allstdadmid));
///selected student list
ArrayList<String> attstd = new ArrayList<String>();
for (int i = 0; i < AttStdListAdapter.userlist.size(); i++) {
if (AttStdListAdapter.userlist.get(i).getSelected()) {
attstd.add(AttStdListAdapter.userlist.get(i).getAdmi_id());
}
}
params.put("student_attend_submit","1");
params.put("class_id",clid);
params.put("sec_id",sectionId);
params.put("ay_id",yrId);
params.put("att_status", String.valueOf(attstd));
Log.d("params", String.valueOf(params));
params.put("stud_attend_date",date);
params.put("inst_id",instId);
params.put("us_id",usid);
params.put("us_type",usType);
return params;
}
};
queue.add(request);
}
//toolbar back to home
public boolean onOptionsItemSelected(#NonNull MenuItem item) {
if(item.getItemId()==android.R.id.home){
finish();
}
return super.onOptionsItemSelected(item);
}
}
After submitting attendance, values of array of srid and admid retrive at server correctly ,problem is that only first record's srid and admid sets to '0' value.There is no problem when same Api is fetch on postman.
I am new in android I work on a webservice application and the backend in laravel ,I want to read the trades and according to the job I find the tasks but I can not display the data it shows me this error msg ..
"org.json.JSONArray cannot be converted to JSONObject"
public static final String TacheNamearray = "libelle_tache";
public static final String TacheName = "libelle_tache";
public static final String JSON_ARRAY_TACHE = "result";
public static final String MetierNamearray = "libelle_metier";
public static final String MetierName = "libelle_metier";
public static final String JSON_ARRAY = "result";
private JSONArray result;
private ArrayList<String> arrayListTache;
TextView tacheename;
Spinner spinner_tache;
Spinner spinner;
Button button;
private GpsTracker gpsTracker;
private TextView tvLatitude,tvLongitude;
String URL_Post = "http://192.168.1.233/projet/public/api/getmetier";
private ArrayList<String> arrayList;
TextView employeename;
private TextView tvUsername, tvEmail;
private UserInfo userInfo;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recherche);
spinner= (Spinner) findViewById(R.id.spnrEmployee);
spinner_tache= (Spinner) findViewById(R.id.spnrTache);
tacheename= (TextView) findViewById(R.id.tvTache);
employeename= (TextView) findViewById(R.id.tvName);
button = (Button) findViewById(R.id.button);
tvLatitude = (TextView)findViewById(R.id.latitude);
tvLongitude = (TextView)findViewById(R.id.longitude);
arrayListTache = new ArrayList<String>();
userInfo = new UserInfo(this);
tvEmail = (TextView)findViewById(R.id.key_email);
String email = userInfo.getKeyEmail();
tvEmail.setText(email);
arrayList = new ArrayList<String>();
getMetiers();
spinner.setOnItemSelectedListener(new
AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int
position, long id) {
//Setting the values to textviews for a selected item
String metier= arrayList.get(position);
getTaches(metier);
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
employeename.setText("");
}
});
}
private void getMetiers() {
StringRequest stringRequest = new
StringRequest("http://192.168.1.233/projet/public/api/getmetier",
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
JSONObject j = null;
try {
j = new JSONObject(response);
result = j.getJSONArray(JSON_ARRAY);
empdetails(result);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
private void empdetails(JSONArray j) {
for (int i = 0; i < j.length(); i++) {
try {
JSONObject json = j.getJSONObject(i);
arrayList.add(json.getString(MetierNamearray));
} catch (JSONException e) {
e.printStackTrace();
}
}
// arrayList.add(0,"Select Employee");
spinner.setAdapter(new ArrayAdapter<String>(RechercheActivity.this,
android.R.layout.simple_spinner_dropdown_item, arrayList));
}
//Method to get student name of a particular position
private String getemployeeName(int position){
String name="";
try {
//Getting object of given index
JSONObject json = result.getJSONObject(position);
//Fetching name from that object
name = json.getString(MetierName);
} catch (JSONException e) {
e.printStackTrace();
}
//Returning the name
return name;
}
public void getLocation(View view){
gpsTracker = new GpsTracker(RechercheActivity.this);
insert();
if(gpsTracker.canGetLocation()){
double latitude = gpsTracker.getLatitude();
double longitude = gpsTracker.getLongitude();
tvLatitude.setText(String.valueOf(latitude));
tvLongitude.setText(String.valueOf(longitude));
}else{
gpsTracker.showSettingsAlert();
}
Intent intent = new Intent(RechercheActivity.this,
TechnicienActivity.class);
startActivity(intent);
}
public void insert(){
StringRequest stringRequest = new StringRequest(Request.Method.POST,
URL_Post, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
Toast.makeText(getApplication(),response,Toast.LENGTH_LONG).show();
}
}, new ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(RechercheActivity.this,error+"",Toast.LENGTH_LONG).show();
}
}
){
#Override
protected Map<String,String>getParams()throws AuthFailureError {
Map<String,String> params = new HashMap<String,String>();
String text1 = spinner.getSelectedItem().toString();
String lon = tvLongitude.getText().toString().trim();
String lat = tvLatitude.getText().toString().trim();
params.put("libelle_metier",text1);
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
private void getTaches(String metier) {
StringRequest stringRequest = new
StringRequest("http://192.168.1.233/projet/public/api/gettaches",
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
JSONObject j = null;
try {
j = new JSONObject(response);
result= j.getJSONArray(JSON_ARRAY_TACHE);
tachedetails(result);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
private void tachedetails(JSONArray j) {
for (int i = 0; i < j.length(); i++) {
try {
JSONObject json = j.getJSONObject(i);
arrayListTache.add(json.getString(TacheNamearray));
} catch (JSONException e) {
e.printStackTrace();
}
// arrayListTache.add(0,"Select Employee");
spinner_tache.setAdapter(new ArrayAdapter<String>
(RechercheActivity.this,
android.R.layout.simple_spinner_dropdown_item, arrayListTache));
}
//Method to get student name of a particular position
private String gettacheName(int position){
String libelle_tache="";
try {
//Getting object of given index
JSONObject json = result.getJSONObject(position);
//Fetching name from that object
libelle_tache = json.getString(TacheName);
} catch (JSONException e) {
e.printStackTrace();
}
//Returning the name
return libelle_tache;
}
and the JSON part gives me that ..
[{"id":1,"libelle_metier":"metier 1","deleted_at":null,"created_at":"2018-04-03 09:12:37","updated_at":"2018-04-03 09:12:37"},{"id":2,"libelle_metier":"metier 2","deleted_at":null,"created_at":"2018-04-03 09:12:44","updated_at":"2018-04-03 09:12:44"},{"id":3,"libelle_metier":"metier 4","deleted_at":null,"created_at":"2018-04-03 09:46:36","updated_at":"2018-04-04 14:15:06"}]
and my PHP code and
class TechniciensController extends Controller
{
public function GetTechniciens()
{
return Technicien::all();
}
return json_encode(Technicien::all());
then you can use json_decode.
this line :
j = new JSONObject(response);
update it:
JSONArray jsonarray = new JSONArray(response);
i think it's works.
I am new to programming and my current app gets data from my server for a single data only and input it into textview. But now I have successfully created a php script that encodes JSONArray with multiple values but I dont know how to get the values to the android code via looping and I also dont know how to populate my listview.
Sample JSON
[{"lnumber":"2","violation":"2"},{"lnumber":"2","violation":"No Helmet"}]
PHP Script
$result = array();
$sql = "SELECT lnumber,violation FROM violators WHERE
lnumber='".$lnumber."'";
$stmt = $con->prepare($sql);
$stmt->execute();
$stmt->bind_result($lnumber, $violation);
while($stmt->fetch())
{
$temp = [
'lnumber'=>$lnumber,
'violation'=>$violation
];
array_push($result, $temp);
}
echo json_encode($result);
How am I currently getting data from server and displaying it using only textview.
Android Code
StringRequest stringRequest = new StringRequest(url, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
loading.dismiss();
showJSON(response);
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getViolation.this,error.getMessage().toString(),Toast.LENGTH_LONG).show();
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
private void showJSON(String response)
{
try
{
String lnumber;
String violation;
JSONObject jsonObject = new JSONObject(response);
JSONArray result = jsonObject.getJSONArray(getConfig.JSON_ARRAY);
JSONObject violationData = result.getJSONObject(0);
lnumber = violationData.getString(getConfig.KEY_LNUMBER);
violation = violationData.getString(getConfig.KEY_VIOLATION);
textViewResult.setText("License Number:\t"+lnumber+"\nViolation:\t"+violation);
}
PS:
My Listview id is listView. If anyone can help me how to display multiple data from the server to the listview would be a very great help!
1.Your JSON root tag is [] . You must use JSONArray . It is not JSONObject .
2.Your sample did not contain datetime key in your JSONObject .
Try this
DataBean
public class DataBean {
/**
* lnumber : 2
* violation : 2
*/
private String lnumber;
private String violation;
public String getLnumber() {
return lnumber;
}
public void setLnumber(String lnumber) {
this.lnumber = lnumber;
}
public String getViolation() {
return violation;
}
public void setViolation(String violation) {
this.violation = violation;
}
}
Adapter
public class MyAdapter extends BaseAdapter {
private List<DataBean> beanList;
private LayoutInflater inflater;
private Context context;
public MyAdapter() {
}
public MyAdapter(List<DataBean> beanList, Context context) {
this.context = context;
this.beanList = beanList;
this.inflater = LayoutInflater.from(context);
}
#Override
public int getCount() {
return beanList == null ? 0 : beanList.size();
}
#Override
public Object getItem(int position) {
return beanList.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = inflater.inflate(R.layout.your_layout, null);
DataBean dataBean = beanList.get(position);
text.setText(dataBean.getLnumber() + dataBean.getViolation());
return view;
}
}
Activity
private List<DataBean> beanList = new ArrayList<>();
private ListView listView;
private void showJSON(String response) {
listView = (ListView) findViewById(R.id.listview);
try {
String lnumber;
String violation;
String datetime;
DataBean dataBean = new DataBean();
JSONArray jsonArray = new JSONArray(response);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
lnumber = jsonObject.getString("lnumber");
violation = jsonObject.getString("violation");
dataBean.setLnumber(lnumber);
dataBean.setViolation(violation);
beanList.add(dataBean);
}
MyAdapter myAdapter = new MyAdapter(beanList,MainActivity.this);
listView.setAdapter(myAdapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
so you want to fetch the json from the php script u have.
use AsyncDataClass to fetch json from your php script and as you are new to programming first read about AsyncDataClass and then try to print the json you fetched from the script using Log.d("","") then proceed to next step.
hi everyone i am working on a android project where i have to retrive the data form JSON. here is my link
I am trying to get the data using the below code
public class DisplayUser extends AppCompatActivity {
private TextView textViewResult;
private ProgressDialog loading;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_user);
textViewResult = (TextView) findViewById(R.id.check_data_id); // in this text view i will display the text
loading = ProgressDialog.show(this,"Please wait...","Fetching...",false,false);
String url = statics_demo.USER_URL+"7";// this is fixed url where i am getting the data
StringRequest stringRequest = new StringRequest(url, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
loading.dismiss();
showJSON(response);
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(DisplayUser.this,error.getMessage().toString(),Toast.LENGTH_LONG).show();
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
JSONObject result;
private void showJSON(String response) {
try {
JSONArray obj = response.getJSONArray("responseMs");
for (int i = 0; i < obj.length(); i++) {
JSONObject jsonObject = obj.getJSONObject(i);
String name = jsonObject.getString("name");
System.out.println("luckyyyyyy"+name);
// String type = jsonObject.getString("type");
// retrieve the values like this so on..
}
}
catch (JSONException e) {
e.printStackTrace();
}
}
}
When i run the code i am getting a erorr saying
"Error:(60, 37) error: cannot find symbol method getJSONArray(String)"
String s = "[]"; JsonParser parser = new JsonParser(); JsonElement tradeElement = parser.parse(s); JsonArray trade = tradeElement.getAsJsonArray();
you need to convert string to jsonarray first
"http://soccer.sportsopendata.net/v1/leagues/premier-league/seasons/16-17/standings" - Link Which Iam Trying to parse
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Button GetServerData = (Button) findViewById(R.id.GetServerData);
GetServerData.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// WebServer Request URL
String serverURL = "http://soccer.sportsopendata.net/v1/leagues/premier-league/seasons/16-17/standings";
// Use AsyncTask execute Method To Prevent ANR Problem
new LongOperation().execute(serverURL);
}
});
}
private class LongOperation extends AsyncTask<String, Void, Void> {
private final HttpClient Client = new DefaultHttpClient();
private String Content;
private String Error = null;
private ProgressDialog Dialog = new ProgressDialog(MainActivity.this);
String data = "";
TextView uiUpdate = (TextView) findViewById(R.id.textView2);
TextView jsonParsed = (TextView) findViewById(R.id.textView3);
int sizeData = 0;
EditText serverText = (EditText) findViewById(R.id.textView);
protected void onPreExecute() {
// NOTE: You can call UI Element here.
//Start Progress Dialog (Message)
Dialog.setMessage("Please wait..");
Dialog.show();
try {
// Set Request parameter
data += "&" + URLEncoder.encode("data", "UTF-8") + "=" + serverText.getText();
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
#Override
protected Void doInBackground(String... urls) {
/************ Make Post Call To Web Server ***********/
BufferedReader reader = null;
// Send data
try {
// Defined URL where to send data
URL url = new URL(urls[0]);
// Send POST data request
URLConnection conn = url.openConnection();
conn.setDoOutput(true);
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
wr.write(data);
wr.flush();
// Get the server response
reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuilder sb = new StringBuilder();
String line = null;
// Read Server Response
while ((line = reader.readLine()) != null) {
// Append server response in string
sb.append(line + "");
}
// Append Server Response To Content String
Content = sb.toString();
} catch (Exception e) {
Error = e.getMessage();
} finally {
try {
reader.close();
} catch (Exception ex) {
}
}
return null;
}
protected void onPostExecute(Void unused) {
// NOTE: You can call UI Element here.
// Close progress dialog
Dialog.dismiss();
if (Error != null) {
uiUpdate.setText("Output : " + Error);
}else
{
//Show Response Json Onscreen(Activity)
uiUpdate.setText( Content );
/****************** Start Parse Response JSON Data *************/
String OutputData = "";
try {
JSONObject jsono = new JSONObject(Content);
JSONObject mainObject = jsono.getJSONObject("data");
JSONArray jsonArray = mainObject.getJSONArray("standing");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject object = jsonArray.getJSONObject(i);
// get details2 JSONObject
String position = object.optString("position").toString();
String team = object.optString("team").toString();
OutputData += "Position: " + position + " "
+ "Team Name : " + team + " ";
}
/****************** End Parse Response JSON Data *************/
//Show Parsed Output on screen (activity)
jsonParsed.setText( OutputData );
}catch (JSONException e) {
e.printStackTrace();
}
}
}
}
}
**I am Creating a premier league application which shows all the datas needed for a premier league fan. As Iam new to this I am getting confused over json parsing and getting data from apis. So Can anyone Explain to me how to change my code or Some links which would help me correct it.
Above given is my java code of Main Activity.**
Thank You Everyone for Helping out. But I found my answer from the search over the internet. Here I used VOLLEY to call the link.
JSON PARSER CLASS
public class ParseJSON {
public static String[] position1;
public static String[] team;
public static String[] points;
public static final String JSON_ARRAY = "data";
public static final String CHILD_ARRAY = "standings";
public static final String KEY_ID = "position";
public static final String KEY_NAME = "team";
private JSONObject users = null;
private JSONArray user2=null;
private JSONObject user3=null;
private String json;
public ParseJSON(String json){
this.json = json;
}
protected void parseJSON() {
JSONObject jsonObject = null;
try {
jsonObject = new JSONObject(json);
users = jsonObject.getJSONObject(JSON_ARRAY);
try {
user2=users.getJSONArray(CHILD_ARRAY);
position1 = new String[user2.length()];
team = new String[user2.length()];
points=new String[user2.length()];
for (int i = 0; i < user2.length(); i++) {
JSONObject jo = user2.getJSONObject(i);
try {
user3=jo.getJSONObject("overall");
points[i] = user3.getString("points");
System.out.println("Message me: "+points[i]);
}catch (Exception e)
{
e.printStackTrace();
}
position1[i] = jo.getString(KEY_ID);
team[i] = jo.getString(KEY_NAME);
System.out.println("Message me: "+position1[i]);
System.out.println("Message me: "+team[i]);
}
}catch (Exception e)
{
e.printStackTrace();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
Main Activity Class
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
public static final String JSON_URL="http://soccer.sportsopendata.net/v1/leagues/premier-league/seasons/16-17/standings";
private Button buttonGet;
private ListView listView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
buttonGet = (Button) findViewById(R.id.buttonGet);
buttonGet.setOnClickListener(this);
listView = (ListView) findViewById(R.id.listView);
}
#Override
public void onClick(View v) {
sendRequest();
}
private void sendRequest() {
final StringRequest stringRequest = new StringRequest(JSON_URL,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
showJSON(response);
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(MainActivity.this, error.getMessage(), Toast.LENGTH_LONG).show();
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
private void showJSON(String json){
ParseJSON pj = new ParseJSON(json);
pj.parseJSON();
CustomList cl = new CustomList(this, ParseJSON.position1,ParseJSON.team,ParseJSON.points);
listView.setAdapter(cl);
}
}
Custom Class for adding datas to list view
public class CustomList extends ArrayAdapter<String> {
private String[] position1;
private String[] team;
private String[] points;
private Activity context;
public CustomList(Activity context, String[] position1, String[] team, String[] points) {
super(context, R.layout.list_view_layout, position1);
this.context = context;
this.position1 = position1;
this.team = team;
this.points = points;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = context.getLayoutInflater();
View listViewItem = inflater.inflate(R.layout.list_view_layout, null, true);
TextView pos1 = (TextView) listViewItem.findViewById(R.id.position1);
TextView teamname = (TextView) listViewItem.findViewById(R.id.teamname);
TextView points1 = (TextView) listViewItem.findViewById(R.id.points);
pos1.setText("Position: "+position1[position]);
teamname.setText("Team: "+team[position]);
points1.setText("Points: "+points[position]);
return listViewItem;
}
}
Step 1 : Use Retroft + RxJava for Asynchronous API calls
Step 2 : Use Gson to Serialize and Deserialize.
Step 3 : Use json to POJO to have a Model Class
Simplify the code.