I having an error while parsing json array in my android application.
My json object is in the following form:
{"post":[
[{"0":"all the best to every one...!!","post":"all the best to every one...!!"},
{"0":"hello every one...","post":"hello every one..."}]
]}
My java file in android is as follows:
public class Newsactivity extends ListActivity {
private static final String TAG_SUCCESS = "";
private ProgressDialog pDialog;
JSONParser jParser = new JSONParser();
ArrayList<HashMap<String, String>> postsList;
private static String url_all_products = "myurl";
private static final String TAG_POST = "post";
JSONArray posts = null;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.allposts);
postsList = new ArrayList<HashMap<String, String>>();
new LoadAllProducts().execute();
ListView lv = getListView();
}
class LoadAllProducts extends AsyncTask<String, String, String> {
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(Newsactivity.this);
pDialog.setMessage("Loading posts. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
protected String doInBackground(String... args) {
List<NameValuePair> params = new ArrayList<NameValuePair>();
JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params);
Log.d("All Posts: ", json.toString());
try {
posts = json.getJSONArray(TAG_POST);
for (int i = 0; i < posts.length(); i++) {
JSONObject c = posts.getJSONObject(i);
String post = c.getString(TAG_POST);
HashMap<String,String> map = new HashMap<String,String>();
map.put(TAG_POST, post);
postsList.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String file_url) {
pDialog.dismiss();
runOnUiThread(new Runnable() {
public void run() {
ListAdapter adapter = new SimpleAdapter(
Newsactivity.this, postsList,
R.layout.singlepost, new String[] { TAG_POST},
new int[] { R.id.pid});
setListAdapter(adapter);
}
});
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_newsactivity, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
I am getting a fatal exception starting this activity. This code is modified code of an online tutorial on json parsing. As I am new to android I am unable to find where the id is. So, please help me. Thank you.
I am afraid that your json format is "a little bit strange" (or i may say it is in a different format with what your code is trying to do) according to your code.
As you can see, there are two "[" after the first "post", which means the array of elements is actually inside another array.
{"post":[ // first '['
[ // second '['
{"0":"all the best to every one...!!","post":"all the best to every one...!!"},
{"0":"hello every one...","post":"hello every one..."}
]
]}
so to make it correct, do following
try {
posts = json.getJSONArray(TAG_POST);
posts = posts.getJSONArray(0) // to get the first array
for (int i = 0; i < posts.length(); i++) {
JSONObject c = posts.getJSONObject(i);
String post = c.getString(TAG_POST);
HashMap<String,String> map = new HashMap<String,String>();
map.put(TAG_POST, post);
postsList.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
as your json responce having nested array you need to code like this...
JSONObject json; = jParser.makeHttpRequest(url_all_products, "GET", params);
Log.d("All Posts: ", json.toString());
try {
posts = json.getJSONArray(TAG_POST);
for (int i = 0; i < posts.length(); i++) {
subposts = posts.getJSONArray(i);
for (int j = 0; j < subposts.length(); j++) {
JSONObject c = subposts.getJSONObject(i);
String post = c.getString(TAG_POST);
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_POST, post);
postsList.add(map);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
Try this:
posts = json.getJSONArray(TAG_POST);
for (int i = 0; i < posts.getJSONArray(0).length(); i++) {
JSONObject c = posts.getJSONArray(0).getJSONObject(i);
String post = c.getString("0");
HashMap<String,String> map = new HashMap<String,String>();
map.put(TAG_POST, post);
postsList.add(map);
}
Related
I have 2 asyncTasks. One for GetCheckLists another for GetCheckListItems.
In CheckList class, it has checkListId,Title,etc and arrayList of checkListItems.
First I get all the checkLists using GetCheckListAsyncTask. Now for each checkList I am calling GetCheckListItemsAsync task to get all the checkListItems.
Now onPostExecute method of GetCheckListItemsAsyncTask I want to set the checkListItemArrayList.
How can I make sure to add checkListItemArrayList to checkList item's object?
CheckListActivity:
public class CheckListActivity extends AppCompatActivity implements CheckListAdapter.OnItemClickListener{
private ProgressDialog progressDialog;
private RecyclerView recyclerView;
private ArrayList<CheckList> checkLists = new ArrayList<>();
private CheckList mCheckList;
private ArrayList<CheckListItem> itemList;
private ArrayList<CheckList> checkListArrayList;
private CheckListAdapter mAdapter;
JSONArray checkListsItemArray,checkListArray;
public int iterationCount = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_check_list);
checkListArrayList = new ArrayList<>();
mEventId = mIntent.getStringExtra("eventId");
mCheckList = new CheckList();
progressDialog = new ProgressDialog(CheckListActivity.this);
recyclerView = (RecyclerView)findViewById(R.id.recycler_view);
mAdapter = new CheckListAdapter(checkListArrayList,CheckListActivity.this,CheckListActivity.this);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(mAdapter);
GetCheckListAsyncTask getCheckListAsyncTask = new GetCheckListAsyncTask();
getCheckListAsyncTask.execute(mEventId);
}
}
#Override
public class GetCheckListsItemAsyncTask extends AsyncTask<String, Void, JSONObject> {
private String api;
private JSONObject jsonParams;
public GetCheckListsItemAsyncTask(){}
#Override
protected JSONObject doInBackground(String... params) {
try {
api = getResources().getString(R.string.server_url) + "api/checklist_items/getChecklistItems.php";
jsonParams = new JSONObject();
String checklistId = params[0]; // params[0] is username
jsonParams.put("checklistId", checklistId);
ServerRequest request = new ServerRequest(api, jsonParams);
return request.sendRequest();
} catch(JSONException je) {
return Excpetion2JSON.getJSON(je);
}
} //end of doInBackground
#Override
protected void onPostExecute(JSONObject response) {
super.onPostExecute(response);
Log.e("ServerResponse", response.toString());
try {
int result = response.getInt("result");
String message = response.getString("message");
if (result == 1) {
Toast.makeText(CheckListActivity.this, message, Toast.LENGTH_LONG).show();
//code after getting profile details goes here
checkListsItemArray = response.getJSONArray("checklistItems");
for (int i = 0; i < checkListsItemArray.length(); i++) {
int pendingTasks = 0,completedTasks = 0;
itemList = new ArrayList<>();
CheckListItem checkListItem = new CheckListItem();
JSONObject subObject = checkListsItemArray.getJSONObject(i);
String checkListItemName = subObject.getString("text");//name of the attribute in response
String checkListItemBudget = subObject.getString("budget");//name of the attribute in response
String checkListItemTimedate = subObject.getString("time_due");
String checkListItemReminder = subObject.getString("reminder");
String checkListItemId = subObject.getString("checklistItemId");
String checkListItemStatus = subObject.getString("status");
if (checkListItemStatus.equals("1")) {
completedTasks++;
}
if (checkListItemStatus.equals("0")) {
pendingTasks++;
}
checkListItem.setTitle(checkListItemName);
checkListItem.setBudget(checkListItemBudget);
checkListItem.setDateTime(checkListItemTimedate);
checkListItem.setReminder(checkListItemReminder);
checkListItem.setCheckListItemId(checkListItemId);
checkListItem.setStatus(checkListItemStatus);
checkListItem.setPendingItem(pendingTasks);
checkListItem.setCompletedItem(completedTasks);
itemList.add(checkListItem);//adding string to arraylist
}
if(checkListArrayList.size() < iterationCount) {
iterationCount++;
String checkListId =
checkListArrayList.get(iterationCount).getCheckListId();
CheckList checkList1 = checkListArrayList.get(iterationCount);
checkList1.setCheckListItemArrayList(itemList);
}
mAdapter.notifyDataSetChanged();
}
else {
Toast.makeText(CheckListActivity.this, message, Toast.LENGTH_LONG).show();
//code after failed getting profile details goes here
}
} catch(JSONException je) {
je.printStackTrace();
Toast.makeText(CheckListActivity.this, je.getMessage(), Toast.LENGTH_LONG).show();
}
} //end of onPostExecute
}
public class GetCheckListAsyncTask extends AsyncTask<String, Void, JSONObject> {
private String api;
private JSONObject jsonParams;
public GetCheckListAsyncTask(){}
#Override
protected JSONObject doInBackground(String... params) {
try {
api = getResources().getString(R.string.server_url) + "api/checklist/getChecklists.php";
jsonParams = new JSONObject();
String eventId = params[0]; // params[0] is username
jsonParams.put("eventId", eventId);
ServerRequest request = new ServerRequest(api, jsonParams);
return request.sendRequest();
} catch(JSONException je) {
return Excpetion2JSON.getJSON(je);
}
} //end of doInBackground
#Override
protected void onPostExecute(JSONObject response) {
super.onPostExecute(response);
//Log.e("ServerResponse", response.toString());
try {
int result = response.getInt("result");
String message = response.getString("message");
if (result == 1 ) {
Toast.makeText(CheckListActivity.this, message, Toast.LENGTH_LONG).show();
//code after getting profile details goes here
checkListArray = response.getJSONArray("checklists");
for (int i = 0; i < checkListArray.length(); i++) {
CheckList checkList = new CheckList();
JSONObject subObject = checkListArray.getJSONObject(i);
String checkListName = subObject.getString("checklist");//name of the attribute in response
String checkListBudget = subObject.getString("budget");//name of the attribute in response
String checkListIcon = subObject.getString("icon");
String checkListId = subObject.getString("checklistId");
checkList.setCheckListTitle(checkListName);
checkList.setBudget(checkListBudget);
checkList.setImageIcon(checkListIcon);
checkList.setCheckListId(checkListId);
checkListArrayList.add(checkList);
iterationCount++;
new GetCheckListsItemAsyncTask().execute(checkListId);
mAdapter.notifyDataSetChanged();
}
if ((progressDialog != null) && progressDialog.isShowing()) {
progressDialog.dismiss();
}
} else {
Toast.makeText(CheckListActivity.this, message, Toast.LENGTH_LONG).show();
//code after failed getting profile details goes here
if ((progressDialog != null) && progressDialog.isShowing()) {
progressDialog.dismiss();
}
}
} catch(JSONException je) {
je.printStackTrace();
Toast.makeText(CheckListActivity.this, je.getMessage(), Toast.LENGTH_LONG).show();
}
} //end of onPostExecute
#Override
protected void onPreExecute(){
super.onPreExecute();
progressDialog.setMessage("Loading...");
progressDialog.show();
}
}
}
How to set CheckListItemsArrayList to the objects of checkListArrayList sequence wise? Please help. Thank you..
You need to elaborate your question. It is very confusing.
But I think that you want to add items to your AsyncTask class.
You can use the Constructor Method for this.
GetCheckListAsyncTask getCheckListAsyncTask = new GetCheckListAsyncTask(checkListsItemArray);
getCheckListAsyncTask.execute(mEventId);
And for AsyncTask Just Add:
JSONArray m_checkListsItemArray;
public GetCheckListsItemAsyncTask(JSONArray checkListsItemArray){
m_checkListsItemArray = checkListsItemArray;
//Do something here with checkListsItemArray;
}
And use m_checkListsItemArray anywhere in the AsycTask class.
Each time you start a task, you have no control when it ends. The tasks are running Asynchronously so they won't end in the order you start them. Maybe have a field level Array or ArrayList that adds results each time a task ends and then when everyhthing has ended you can work with the array results.
I have this class I'm calling to populate a list view with the following code, problem is that it appends a list view when a call it and I need it to clear previously populated data. How can I do this Thank you.
protected String doInBackground(String... args) {
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("Products", Products));
JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params);
Log.d("All Products: ", json.toString());
try {
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
products = json.getJSONArray(TAG_PRODUCTS);
for (int i = 0; i < products.length(); i++) {
JSONObject c = products.getJSONObject(i);
String id = c.getString(TAG_PID);
String name = c.getString(TAG_NAME);
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_PID, id);
map.put(TAG_NAME, name);
productsList.add(map);
}
} else {}
} catch (JSONException e) {e.printStackTrace();}
return null;
}
protected void onPostExecute(String file_url) {
pDialog.dismiss();
runOnUiThread(new Runnable() {
public void run() {
ListAdapter adapter = new SimpleAdapter(
Concurency_main.this, productsList,
R.layout.list_item, new String[] { TAG_PID,
TAG_NAME},
new int[] { R.id.user_id, R.id.user_name});
setListAdapter(adapter);
}
});
}
If you add to a list, it gets appended. If you want to remove all and then add
Call list.clear() method to remove all the entries in the list.
protected String doInBackground(String... args) {
//remove all your list items
productsList.clear();
//Now your list is empty, try adding it now!
}
I am creating an android application and my code will loop through the json data and if finds a match to the string that i have placed in ( in this case "Guil Hernandez") , then it will add that name to an array list of hashmaps. I then populate my listview with a simple adapter. Everything is working properly, but my listview will not appear. Am i doing this sorting "algorithm" wrong? Also if you know of a better way to do the sorting to find a match..PLEASE LET ME KNOW. i am still new to this. Thank you in advance!
private void handleResponse() {
if (mNameDataJson == null ) {
// TODO: handle error
} else {
try {
JSONArray namesArray = mNameDataJson.getJSONArray("posts");
ArrayList<HashMap<String , String> > nameArrayList = new ArrayList<HashMap<String, String>>();
for ( int i = 0 ; i < namesArray.length() ; i++ ) {
JSONObject unit = namesArray.getJSONObject(i);
String name = unit.getString(KEY_NAME);
name = Html.fromHtml(name).toString();
String title = unit.getString(KEY_TITLE);
title = Html.fromHtml(title).toString();
HashMap<String , String> hashMap = new HashMap<String, String>();
if (name == "Guil Hernandez") {
hashMap.put(KEY_NAME, name);
hashMap.put(KEY_TITLE, title);
nameArrayList.add(hashMap);
} else {
Log.v(TAG , "no match");
}
}
String[] keys = { KEY_NAME , KEY_TITLE };
int[] ids = {android.R.id.text1 , android.R.id.text2};
SimpleAdapter adapter = new SimpleAdapter(MyActivity.this , nameArrayList , android.R.layout.simple_list_item_2,
keys , ids);
setListAdapter(adapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
full code here :
public class MyActivity extends ListActivity {
private JSONObject mNameDataJson;
private final String TAG = MyActivity.class.getSimpleName();
private final String KEY_NAME = "author";
private final String KEY_TITLE = "title";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
GetNameData getNameData = new GetNameData();
getNameData.execute();
}
private void handleResponse() {
if (mNameDataJson == null ) {
// TODO: handle error
} else {
try {
JSONArray namesArray = mNameDataJson.getJSONArray("posts");
ArrayList<HashMap<String , String> > nameArrayList = new ArrayList<HashMap<String, String>>();
for ( int i = 0 ; i < namesArray.length() ; i++ ) {
JSONObject unit = namesArray.getJSONObject(i);
String name = unit.getString(KEY_NAME);
name = Html.fromHtml(name).toString();
String title = unit.getString(KEY_TITLE);
title = Html.fromHtml(title).toString();
HashMap<String , String> hashMap = new HashMap<String, String>();
if (name == "Guil Hernandez") {
hashMap.put(KEY_NAME, name);
hashMap.put(KEY_TITLE, title);
nameArrayList.add(hashMap);
} else {
Log.v(TAG , "no match");
}
}
String[] keys = { KEY_NAME , KEY_TITLE };
int[] ids = {android.R.id.text1 , android.R.id.text2};
SimpleAdapter adapter = new SimpleAdapter(MyActivity.this , nameArrayList , android.R.layout.simple_list_item_2,
keys , ids);
setListAdapter(adapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
private class GetNameData extends AsyncTask<Object, Void, JSONObject> {
JSONObject jsonResponse = null;
#Override
protected JSONObject doInBackground(Object... objects) {
String nameUrl = "http://blog.teamtreehouse.com/api/get_recent_summary/?count=20";
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url(nameUrl)
.build();
Call call = client.newCall(request);
call.enqueue(new Callback() {
#Override
public void onFailure(Request request, IOException e) {
}
#Override
public void onResponse(Response response) throws IOException {
String responseString = response.body().string();
Log.v(TAG , responseString);
try {
jsonResponse = new JSONObject(responseString);
} catch (JSONException e) {
e.printStackTrace();
}
}
});
return jsonResponse;
}
#Override
protected void onPostExecute(JSONObject jsonObject) {
mNameDataJson = jsonObject;
handleResponse();
}
}
}
If you want to compare strings use equals(). Like this:
if (name.equals("Guil Hernandez")) {
hashMap.put(KEY_NAME, name);
hashMap.put(KEY_TITLE, title);
nameArrayList.add(hashMap);
}
I tried searching for similar questions but I cant find anything that fits in to what I am doing.. I'm trying to populate a listview from a database and whenever I run it, it doesn't display anything in the listview..
here is the logcat..
JSONException: Value {"message":"Patient Available","success":1,"post":[{"lname":"miradora doringo","address":"navotas, pilipinas","email":"tam.muqu23","age":"20","gender":"babae","remarks":"mabuting estudyante","patient_id":"6","contact":"361008762","fname":"jenelien"},{"lname":"andres","address":"manila","email":"julieannandres#gmail.com","age":"20","gender":"female","remarks":"trial","patient_id":"7","contact":"926644895","fname":"julie"}]} of type org.json.JSONObject cannot be converted to JSONArray
this is my Viewpatient.java:
public class Viewpatient extends ListActivity {
private Button create;
private ProgressDialog pDialog;
private static final String READ_PATIENT_URL = "http://192.168.43.15:8080/DoctorScheduler/activities/viewpatient.php";
private static final String TAG_SUCCESS = "success";
private static final String TAG_MESSAGE = "message";
private static final String TAG_POST = "post";
private static final String TAG_PATIENT = "patient_id";
private static final String TAG_FNAME = "fname";
private static final String TAG_LNAME = "lname";
private static final String TAG_AGE = "age";
private static final String TAG_GENDER = "gender";
private static final String TAG_CONTACT = "contact";
private static final String TAG_EMAIL = "email";
private static final String TAG_ADDRESS = "address";
private static final String TAG_REMARKS = "remarks";
JSONParser jsonParser = new JSONParser();
//array of all patient information by patient
JSONArray Apatient = null;
//manages all patient in a list
ArrayList<HashMap<String, String>> ApatientList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_viewpatient);
ApatientList = new ArrayList<HashMap<String, String>>();
new LoadInformation().execute();
ListView lv = getListView();
lv.setOnItemClickListener(new OnItemClickListener(){
#Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// TODO Auto-generated method stub
// INSERT ALL PREVIOUS CONSULTATIONS OF THE PATIENT HERE
}
});
create = (Button) findViewById(R.id.BtnAdd);
create.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent createInfo = new Intent(Viewpatient.this, Viewupdate.class);
startActivity(createInfo);
}
});
};
public class LoadInformation extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
pDialog = new ProgressDialog(Viewpatient.this);
pDialog.setMessage("Loading all patient information....");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
}
#Override
protected Void doInBackground(Void... args) {
// TODO Auto-generated method stub
List<NameValuePair> params = new ArrayList<NameValuePair>();
// Making a request to url and getting response
String json = jsonParser.getJSONFromURL(READ_PATIENT_URL, "POST", params);
Log.d("Response: ", "> " + json);
try {
Apatient = new JSONArray(json);
if (Apatient != null) {
// looping
for (int i = 0; i < Apatient.length(); i++) {
JSONObject c = Apatient.getJSONObject(i);
String patient_id = c.getString(TAG_PATIENT);
String fname = c.getString(TAG_FNAME);
String lname = c.getString(TAG_LNAME);
String age = c.getString(TAG_AGE);
String gender = c.getString(TAG_GENDER);
String contact = c.getString(TAG_CONTACT);
String email = c.getString(TAG_EMAIL);
String address = c.getString(TAG_ADDRESS);
String remarks = c.getString(TAG_REMARKS);
// tmp hashmap for single contact
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_PATIENT, patient_id);
map.put(TAG_FNAME, fname);
map.put(TAG_LNAME, lname);
map.put(TAG_AGE, age);
map.put(TAG_GENDER, gender);
map.put(TAG_CONTACT, contact);
map.put(TAG_EMAIL, email);
map.put(TAG_ADDRESS, address);
map.put(TAG_REMARKS, remarks);
// adding contact to contact list
ApatientList.add(map);
}
} else {
Log.e("Error", "Couldn't get any data from the url");
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
//super.onPostExecute(result);
pDialog.dismiss();
runOnUiThread(new Runnable(){
public void run(){
ListAdapter adapter = new SimpleAdapter(
Viewpatient.this, ApatientList, R.layout.main,
new String[] { TAG_PATIENT, TAG_FNAME, TAG_LNAME, TAG_AGE,
TAG_GENDER, TAG_CONTACT, TAG_EMAIL, TAG_ADDRESS, TAG_REMARKS },
new int[] { R.id.txtID, R.id.txtFName, R.id.txtLName, R.id.txtAge, R.id.txtGender,
R.id.txtContact, R.id.txtEmail, R.id.txtAddress, R.id.txtRemarks});
setListAdapter(adapter);
}
});
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.viewpatient, menu);
return true;
}
}
this my JSONParser.java:
public class JSONParser {
//new
static String response = null;
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
//constructor
public JSONParser(){
}
public String getJSONFromURL(String url, String method,
List<NameValuePair> params){
try {
// http client
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpEntity httpEntity = null;
HttpResponse httpResponse = null;
// Checking http request method type
if (method == "POST") {
HttpPost httpPost = new HttpPost(url);
// adding post params
if (params != null) {
httpPost.setEntity(new UrlEncodedFormEntity(params));
}
httpResponse = httpClient.execute(httpPost);
} else if (method == "GET") {
// appending params to url
if (params != null) {
String paramString = URLEncodedUtils
.format(params, "utf-8");
url += "?" + paramString;
}
HttpGet httpGet = new HttpGet(url);
httpResponse = httpClient.execute(httpGet);
}
httpEntity = httpResponse.getEntity();
response = EntityUtils.toString(httpEntity);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return response;
}
}
and this is my viewpatient.php:
<?php
require ("../config.inc.php");
$query = "Select * From patientinfo";
try{
$stmt = $dbname->prepare($query);
$result = $stmt->execute();
}catch(PDOException $ex){
$response["success"] = 0;
$response["message"] = "Database Error!";
die(json_encode($response));
}
//retrieve all the rows
$rows = $stmt->fetchAll();
if($rows){
$response["success"] = 1;
$response["message"] = "Patient Available";
$response["post"] = array();
foreach($rows as $row){
$post = array();
$post["patient_id"] = $row["patient_id"];
$post["fname"] = $row["fname"];
$post["lname"] = $row["lname"];
$post["age"] = $row["age"];
$post["gender"] = $row["gender"];
$post["contact"] = $row["contact"];
$post["email"] = $row["email"];
$post["address"] = $row["address"];
$post["remarks"] = $row["remarks"];
//update json response
array_push($response["post"], $post);
}
echo json_encode($response);
}
else{
$response["success"] = 0;
$response["message"] = "No available patient information";
die(json_encode($response));
}
?>
You should change this part Apatient = new JSONArray(json);
Create a JSONObject JSONObject ApatientObject = new JSONObject(json);
Then get your JSONArray from there like this :
Apatient = new JSONArray(ApatientObject.getJSONArray("post"))
The problem is that the response you receive from the server is a JSONObject, not a JSONArray. The JSONObject contains 2 Strings, "message" and "success", and also contains a JSONArray "post" which holds the data you are looking for.
EDIT:
If you're only retreiving data from the server then it can be useful to think in terms of using GET for retrieving / viewing information and POST for creating / editing information as mentioned here:
When do you use POST and when do you use GET?
I want to display a loading process when my application is loading data from the database.
This is my Java file.
Where do I have to put the function to display the loading process?
public class AksesServerActivity extends ListActivity {
private static String link_url = "http://plnskh.zz.mu/android/berita/cekdaftar.php";
private static final String AR_ID = "id";
private static final String AR_JUDUL = "judul";
private static final String AR_CONTENT = "content";
JSONArray artikel = null;
ArrayList<HashMap<String, String>> daftar_artikel = new ArrayList<HashMap<String, String>>();
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
JSONParser jParser = new JSONParser();
JSONObject json = jParser.AmbilJson(link_url);
try {
artikel = json.getJSONArray("artikel");
for(int i = 0; i < artikel.length(); i++){
JSONObject ar = artikel.getJSONObject(i);
String id = ar.getString(AR_ID);
String judul = ar.getString(AR_JUDUL);
String content = ar.getString(AR_CONTENT).substring(0,100)+"...(baca selengkapnya)";
HashMap<String, String> map = new HashMap<String, String>();
map.put(AR_ID, id);
map.put(AR_JUDUL, judul);
map.put(AR_CONTENT, content);
daftar_artikel.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
this.adapter_listview();
}
public void adapter_listview() {
ListAdapter adapter = new SimpleAdapter(this, daftar_artikel,
R.layout.list_item,
new String[] { AR_JUDUL, AR_CONTENT, AR_ID}, new int[] {
R.id.judul, R.id.content, R.id.kode});
setListAdapter(adapter);
ListView lv = getListView();
lv.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,int position, long id) {
String kode = ((TextView) view.findViewById(R.id.kode)).getText().toString();
Intent in = new Intent(AksesServerActivity.this, DetailAksesServer.class);
in.putExtra(AR_ID, kode);
startActivity(in);
}
});
}
}
public class LongOperation extends AsyncTask<String, String, String>
{
ProgressDialog pdialog;
#Override
protected String doInBackground(String... params) {
JSONParser jParser = new JSONParser();
JSONObject json = jParser.AmbilJson(link_url);
try {
artikel = json.getJSONArray("artikel");
for(int i = 0; i < artikel.length(); i++){
JSONObject ar = artikel.getJSONObject(i);
String id = ar.getString(AR_ID);
String judul = ar.getString(AR_JUDUL);
String content = ar.getString(AR_CONTENT).substring(0,100)+"...(baca selengkapnya)";
HashMap<String, String> map = new HashMap<String, String>();
map.put(AR_ID, id);
map.put(AR_JUDUL, judul);
map.put(AR_CONTENT, content);
daftar_artikel.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
pdialog.dismiss();
this.adapter_listview();
}
#Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
pdialog = new ProgressDialog(NewsActivity.this);
pdialog.setMessage("Loading");
pdialog.show();
}
}
for more clarification about asynchronous task and its methods, check here
You must use AsyncTask class, override doInBackground method to perform your databse fetch, onPreExecute method to show your loading and onPostExecute to hide it. you can refer AsynTask process and AsynTask post for more information