I'm trying to get a JsonObject from a local server,this is my object:
[
{
"id":2,
"latitude":34.042542,
"longitude":-4.997182,
"title":"zone1",
"icone":"http://192.168.1.50/Heloo/images/icone.png"
}
]
i want to set 3 variables (JsonLat as double by latitude/ JsonLong as double by longitude / JsonName as string by title ) but after executing my application i can't get this value .
My requestData(url) is in onCreate() just after setContentView().
this is my HttpManager class :
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class HttpManager {
public static String getData(String uri) {
BufferedReader reader = null;
try {
URL url = new URL(uri);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
StringBuilder sb = new StringBuilder();
reader = new BufferedReader(new InputStreamReader(con.getInputStream()));
String line;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
return sb.toString();
} catch (Exception e) {
e.printStackTrace();
return null;
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
}
}
}
this is my requestData() definition and MyTask class :
public void requestData(String uri) {
MyTask task = new MyTask();
task.execute(uri);
}
public class MyTask extends AsyncTask<String, String, String> {
#Override
protected void onPreExecute() {
// updateDisplay("Starting task");
//tasks.add(this);
}
#Override
protected String doInBackground(String... params) {
String content = HttpManager.getData(params[0]);
return content;
}
#Override
protected void onPostExecute(String result) {
try {
JSONArray cast = new JSONArray(result);
for (int i=0; i<cast.length(); i++) {
JSONObject Marker = new JSONObject(cast.get(i).toString());
JsonLat = Marker.getDouble("latitude");
Jsonlong = Marker.getDouble("longitude");
JsonName = Marker.getString("title");
}
} catch (JSONException e) {
e.printStackTrace();
}
}
#Override
protected void onProgressUpdate(String... values) {
// updateDisplay(values[0]);
}
}
EDIT : I tried to show the values with the log.v inside the try{} , i can see my values , but when i tried to use the value outside the try {} it doesn't work , also when i try to apply a function with JsonLat ,Jsonlng , JsonName as parameters inside the try{} it doesn't work as well it seems that there is a probleme with try{} or i don't know !!!!!
You are getting JSONArray from server ..You have to parse JsonArray
JSONArray cast // your jsonarray object
for (int i=0; i<cast.length(); i++) {
JSONObject Marker = new JSONObject(cast.get(i));
JsonLat = Marker.getDouble("latitude");
Jsonlong = Marker.getDouble("longitude");
JsonName = Marker.getString("title");
}
Actually this works when I try with another random JSON data. I think your problem is with getDouble() methods. You can just get them all as strings with getString() method. Then you can make conversion in Java.
Related
I had wrote a code which use a parse to catch some data from a JSON file but i don't know what kind of structure is better between the sparse array or the array map for memorise these data ?
I had used a array map but I don't know if it's too wasted on so little data data.
public class MainActivity extends AppCompatActivity {
private ProgressDialog pd;
private String TAG = MainActivity.class.getSimpleName();
public ArrayMap<Integer, ValoriDiSueg> ArrayDati = new ArrayMap<>();
Button buttonProg;
TextView textViewProg;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
buttonProg = (Button) findViewById(R.id.button);
textViewProg = (TextView) findViewById(R.id.textView);
buttonProg.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
new JsonCLASS().execute("https://samples.openweathermap.org/data/2.5/weather?q=London,uk&appid=b6907d289e10d714a6e88b30761fae22");
}
});
}
private class JsonCLASS extends AsyncTask<String, String, String> {
#Override
protected void onPreExecute() {
super.onPreExecute();
pd = new ProgressDialog(MainActivity.this);
pd.setMessage("Please wait");
pd.setCancelable(false);
pd.show();
}
#Override
protected String doInBackground(String... params) {
HttpURLConnection connection = null;
BufferedReader reader = null;
try {
URL url = new URL(params[0]);
connection = (HttpURLConnection) url.openConnection();
connection.connect();
InputStream stream = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(stream));
StringBuffer buffer = new StringBuffer();
String line = "";
while ((line = reader.readLine()) != null) {
buffer.append(line + "\n");
Log.d("Response: ", "> " + line); //here u ll get whole response...... :-)
}
return buffer.toString();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (connection != null) {
connection.disconnect();
}
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
The parse of these data
#Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
try {
JSONObject jsonObject = new JSONObject(result);
JSONArray Arr = new JSONArray(jsonObject.getString("weather"));
for (int i = 0; i < Arr.length(); i++){
JSONObject jsonPart = Arr.getJSONObject(i);
ArrayDati.put(i,new ValoriDiSueg( jsonPart.getString("main"), jsonPart.getString("description")));
//ArrayDati.put(i,new ValoriDiSueg("description : "+ jsonPart.getString("description")));
textViewProg.setText(textViewProg.getText()+"main : "+ ArrayDati.get(i).Main +"\n"+textViewProg.getText()+"description : "+ ArrayDati.get(i).Description );
}
} catch (Exception e ){
e.printStackTrace();
}
if (pd.isShowing()) {
pd.dismiss();
}
}
}
}
And I created a class:
public class ValoriDiSueg {
String Main;
String Description;
public ValoriDiSueg(String main, String description) {
this.Main = main;
this.Description = description;
}
}
any suggestions??
In simple:
If your key is int or long, you should use SparseArray, SparseLongArray as it will not boxing/un-boxing the key value when operates. Also, it provides similar classes for int/long values as long as the key is int/long.
If you key is not int nor long, such as an object or String, you should use ArrayMap instead as it will handle the conflicts of key hashes.
There are no much performance and memory usage difference between these two class as they are all requires O(log n) to search and O(n) to insert/delete (in most cases).
I have a problem with this Json file. I am trying to do a Parser that shows in a textview the results after a button is pressed. I wonna parse the "firstName" tag but to do this, I need to pass through the others tags like "league" and "standard". I don't know how to parse them in this Json file.
The Json file is structured like this:
{
"_internal":{
"pubDateTime":"2017-06-23 03:21:52.076",
"xslt":"xsl/league/roster/marty_active_players.xsl",
"eventName":"league_roster"
},
"league":{
"standard":[
{
"firstName":"Alex",
"lastName":"Abrines",
"personId":"203518",
"teamId":"1610612760 1610612760",
"jersey":"8",
"pos":"G-F",
"heightFeet":"6",
"heightInches":"6",
"heightMeters":"1.98",
"weightPounds":"190",
"weightKilograms":"86.2",
"dateOfBirthUTC":"1993-08-01",
"teams":[
{
"teamId":"1610612760",
"seasonStart":"2016",
"seasonEnd":"2016"
}
],
"draft":{
"teamId":"1610612760",
"pickNum":"32",
"roundNum":"2",
"seasonYear":"2013"
},
"nbaDebutYear":"2016",
"yearsPro":"0",
"collegeName":"",
"lastAffiliation":"Spain/Spain",
"country":"Spain"
},
This is my Java code:
public class MainActivity extends AppCompatActivity {
Button btnHit;
TextView txtJson;
ProgressDialog pd;
String Players[] = new String[100];
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnHit = (Button) findViewById(R.id.btn);
txtJson = (TextView) findViewById(R.id.tvJsonItem);
btnHit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
new JsonTask().execute("http://data.nba.net/10s/prod/v1/2016/players.json");
}
});
}
private class JsonTask extends AsyncTask<String, String, String> {
protected void onPreExecute() {
super.onPreExecute();
pd = new ProgressDialog(MainActivity.this);
pd.setMessage("Please wait");
pd.setCancelable(false);
pd.show();
}
protected String doInBackground(String... params) {
HttpURLConnection connection = null;
BufferedReader reader = null;
try {
URL url = new URL(params[0]);
connection = (HttpURLConnection) url.openConnection();
connection.connect();
InputStream stream = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(stream));
StringBuffer buffer = new StringBuffer();
String line = "";
while ((line = reader.readLine()) != null) {
buffer.append(line + "\n");
Log.d("Response: ", "> " + line); //here u ll get whole response...... :-)
}
return buffer.toString();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (connection != null) {
connection.disconnect();
}
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
#Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
try {
JSONObject jsonObject = new JSONObject(result);
String DataPlayers = jsonObject.getString("standard");
JSONArray jsonArray = new JSONArray(DataPlayers);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject JO = jsonArray.getJSONObject(i);
Players[i] = JO.getString("firstName");
txtJson.append(Players[i] + "\n");
}
} catch (JSONException e) {
e.printStackTrace();
}
if (pd.isShowing()) {
pd.dismiss();
}
}
}
Wrong:
JSONObject jsonObject = new JSONObject(result);
String DataPlayers = jsonObject.getString("standard");
Correct:
JSONObject jsonObject = new JSONObject(result);
JsonObject objStandard = jsonObject.getJSONObject("league");
Now from objStandard object, you can retrieve the json array and iterate through the sub json objects.
JSONArray jsonArray = objStandard.getJSONArray("standard");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject JO = jsonArray.getJSONObject(i);
Players[i] = JO.getString("firstName");
txtJson.append(Players[i] + "\n");
}
2 cents suggestion :)
It seems you have just started exploring android development, saying based on you are using a legacy method of json parsing, I would suggest you to check out GSON library, which is a Java serialization/deserialization library to convert Java Objects into JSON and back. In short, you will not be needed to parse JSON response manually but rather you will be having normal java class objects and members/methods to deal with.
Your code should be like this
try {
String result = "your_json_string";
JSONObject jsonObject = new JSONObject(result);
JSONObject leagueObject = jsonObject.getJSONObject("league");
JSONArray standardArray = leagueObject.getJSONArray("standard");
for (int i = 0; i < standardArray.length(); i++) {
JSONObject standardObject = standardArray.getJSONObject(i);
String name = standardObject.getString("firstName");
}
} catch (Exception e) {
System.out.println(e);
}
I am getting problem to parse json in android spinner. I have tried by below listed code but I am getting full json array in spinner like screenshot
My Json Array
{"Department":[{"1":"Computer"},{"2":"IT"},{"3":"Civil"}]} // like this type json string
My Code
public class GetDropdownItems extends AsyncTask<Void, Void, String[]> {
public GetDropdownItems() {
super();
}
#Override
protected void onPreExecute() {
super.onPreExecute();
Log.i("MY_NETWORK", "first");
}
#Override
protected String[] doInBackground(Void... params) {
StringBuilder sbstaffdep = new StringBuilder();
String staffdepURL = StaticDataEntity.URL_GETDEP;
String charset = "UTF-8"; // Or in Java 7 and later, use the constant: java.nio.charset.StandardCharsets.UTF_8.name()
URLConnection connectionstaffDep = null;
try {
connectionstaffDep = new URL(staffdepURL).openConnection();
} catch (IOException e) {
e.printStackTrace();
}
connectionstaffDep.setDoOutput(true); // Triggers POST.
connectionstaffDep.setRequestProperty("Accept-Charset", charset);
connectionstaffDep.setConnectTimeout(6000);
InputStream responsestaffDep = null;
try {
responsestaffDep = connectionstaffDep.getInputStream();
} catch (IOException e) {
e.printStackTrace
();
return new String[]{"unreachable"};
}
BufferedReader brstaffDep = new BufferedReader(new InputStreamReader(responsestaffDep));
String readstaffDep;
try {
while ((readstaffDep = brstaffDep.readLine()) != null) {
//System.out.println(read);
sbstaffdep.append(readstaffDep);
}
} catch (IOException e) {
e.printStackTrace();
}
try {
brstaffDep.close();
} catch (IOException e) {
e.printStackTrace();
}
String[] finaldata = new String[1];
finaldata[0] = sbstaffdep.toString();
return finaldata;
}
#Override
protected void onPostExecute(String[] s) {
super.onPostExecute(s);
if (s[0].equals("unreachable")) {
new SweetAlertDialog(SignUpStaff.this, SweetAlertDialog.ERROR_TYPE)
.setTitleText("Oops...")
.setContentText("Unable to connect to server ! \n Please try again later.")
.setCancelText("Ok")
.setCancelClickListener(new SweetAlertDialog.OnSweetClickListener() {
#Override
public void onClick(SweetAlertDialog sweetAlertDialog) {
sweetAlertDialog.cancel();
}
})
.show();
return;
}
Log.i("MY_NETWORK", s.toString());
String[] dataofdropdowndep = s[0].split(",");
ArrayAdapter<String> adapterdep = new ArrayAdapter<String>(SignUpStaff.this, android.R.layout.simple_list_item_1, dataofdropdowndep);
adapterdep.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
dropstaffdep.setAdapter(adapterdep);
}
}
public class GetDropdownItems extends AsyncTask<Void, Void, String> {
public GetDropdownItems() {
super();
}
#Override
protected void onPreExecute() {
super.onPreExecute();
Log.i("MY_NETWORK", "first");
}
#Override
protected String doInBackground(Void... params) {
StringBuilder sbstaffdep = new StringBuilder();
String staffdepURL = StaticDataEntity.URL_GETDEP;
String charset = "UTF-8"; // Or in Java 7 and later, use the constant: java.nio.charset.StandardCharsets.UTF_8.name()
URLConnection connectionstaffDep = null;
try {
connectionstaffDep = new URL(staffdepURL).openConnection();
} catch (IOException e) {
e.printStackTrace();
}
connectionstaffDep.setDoOutput(true); // Triggers POST.
connectionstaffDep.setRequestProperty("Accept-Charset", charset);
connectionstaffDep.setConnectTimeout(6000);
InputStream responsestaffDep = null;
try {
responsestaffDep = connectionstaffDep.getInputStream();
} catch (IOException e) {
e.printStackTrace
();
return "unreachable";
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
responsestaffDep, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
Log.d("-------------", json);
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
return json;
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
if (s.equals("unreachable")) {
new SweetAlertDialog(SignUpStaff.this, SweetAlertDialog.ERROR_TYPE)
.setTitleText("Oops...")
.setContentText("Unable to connect to server ! \n Please try again later.")
.setCancelText("Ok")
.setCancelClickListener(new SweetAlertDialog.OnSweetClickListener() {
#Override
public void onClick(SweetAlertDialog sweetAlertDialog) {
sweetAlertDialog.cancel();
}
})
.show();
return;
}
Log.i("MY_NETWORK", s.toString());
Json js=new Json(s);
JSONArray array=js.getJSONArray("Department");
for(JSONArray b:array){
// traverse array here
}
ArrayAdapter<String> adapterdep = new ArrayAdapter<String>(SignUpStaff.this, android.R.layout.simple_list_item_1, dataofdropdowndep);
adapterdep.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
dropstaffdep.setAdapter(adapterdep);
}
}
HI Change your Json Response from server or you can change manually .
Here is your format :
{"Department"
[
{
"1": "Computer"
},
{
"2": "IT"
},
{
"3": "Civil"
}
]
}
Please check it with any json viewer format online.
this type json data:
check this json array:
{
"schools": [{
"Name": "Hill View Elementary",
"SchoolID": "HVE"
}, {
"Name": "Mill View",
"SchoolID": "MVE"
}, {
"Name": "Big School",
"SchoolID": "BSC"
}]
}
your mistake is you are not putting comma between two objects
The way you are fetching the Json file is wrong, there is already Json classes that can easly get each array,object or key alone.
org.json is the library we are going to use with the JSONArray and JSONObject classes.
Before we start you should know a basic understanding of the Json file scheme :
"name":{} this is the array syntax represented by the {} symbols, this array can hold arrays,objects or keys.
[] represent and object which can hold arrays and keys too but it doesn't have name.
"key":"value" now the is key type which can hold the data or values you want and has a key to retrieve it by name.
Now here is a piece of code to fetch your file and get each part of the Json file alone and then you can populate it as you wish.
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.content.res.Resources;
public class Fetch {
final private static String DEPARTMENT = "Department";
String [] departments ;
public void fetch(Resources r , int resourceID) {
String JsonString = readStringFromRaw(r, resourceID);
//the whole josn file is a json object even if it starts with { and ends with } so...
try {
JSONObject mainObject = new JSONObject(JsonString);
// the JSONObject throws a JSONException if there is something wrong with the syntax
JSONArray department = mainObject.getJSONArray(DEPARTMENT);
int length = department.length();
departments = new String[length];
JSONObject object;
for(int i = 0 ; i < length ; i++){
object = department.getJSONObject(i);
departments[0] = object.getString(""+i+1);
//this because you tagged the keys with 1 , 2 , 3 and so on.. so it has the value of the object that it is in + 1 .
//the reason I put "" empty quotations is because I want it a string so this is a way to cast the numbers to strings .
}
} catch (JSONException e) {
e.printStackTrace();
}
}
public static String readStringFromRaw(Resources r, int resourceID) {
InputStream is = r.openRawResource(resourceID);
BufferedReader br = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder(1000);
String line;
try {
while ((line = br.readLine()) != null)
sb.append(line);
br.close();
is.close();
return sb.toString();
} catch (IOException e) {
return e.getMessage();
}
}
}
With this class you can get a String array holding the departments you want for your json file that you have.
The heirarchy between arrays and objects is very important so keep in mind that when you write a json file make it less complicated to extract the information easier.
I am new to android and am completely puzzled by AsyncTasks. I need to create a leaderboard which will pull global leaderboard scores from a server.
I have posted below the two methods that were created in the LeaderboardsFragment which are used to access and display the scores - getGlobalScores and readStream.
I am unsure of how to use these in the AsyncTask - mostly how and what parameters to pass to the AsyncTask - most of the tutorials I have been looking at do not deal with 2D arrays. Any hints would be really appreciated, I am really having trouble understanding the literature surrounding this.
package uk.ni.appidemic.whackamole;
import java.io.BufferedReader;
public class LeaderboardsFragment extends Fragment {
AssetStore AS;
private TextView TopScores;
private String[][] global_scores = new String[10][3];
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_leaderboards, container, false);
//Go and get the asset store from the activity
AS = WhackAMoleActivity.getAssetManager();
TopScores = (TextView) rootView.findViewById(R.id.leaderboards);
// Extract and display the top score text view from the preferences
displayLocalScores();
// this method is used to send a highscore to the server (name and score)
// this method may get pulled out to the gameloop as its the only place it should be used in the final game
// but this can be used for testing purposes atm (Server needs to be on)
// sendScoreGlobal("porter", 1001);
//async Get global scores from the server and display them - new thread
new AsyncOperation().execute();
...................
public void getGlobalScores() {
//gets global score in HTML format to be parsed
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
try {
URL url = new URL("http://62........./high_scores");
HttpURLConnection con = (HttpURLConnection) url.openConnection();
readStream(con.getInputStream());
} catch (Exception e) {
e.printStackTrace();
}
}
/gets the data and stores the global scores in a 2d array
//it then displays to screen
public void readStream(InputStream in) {
BufferedReader reader = null;
try {
StringBuilder htmlIn = new StringBuilder();
StringBuilder globalScoreBuilder = new StringBuilder();
htmlIn.append("");
reader = new BufferedReader(new InputStreamReader(in));
String line = "";
while ((line = reader.readLine()) != null) {
htmlIn.append(line);
}
// String to be scanned to find the pattern.
String html = htmlIn.toString();
String regexPattern = "<td align=\"left\" style=\"padding-left:10px;\">(\\d+?)</td>|<td align=\"right\" style=\"padding-right:10px;\">(\\w+?)</td>";
// Create a Pattern object
Pattern patternObject = Pattern.compile(regexPattern);
// Now create matcher object.
Matcher matcherObject = patternObject.matcher(html);
Log.d(getActivity().getResources().getString(R.string.LOG_TAG), "Trying to find regex matches");
TopScores.append("\n");
int nextFreePointer = 0;
int rowCount = 0;
while (matcherObject.find()) {
if (matcherObject.group(1) != null) {
Log.d(getActivity().getResources().getString(R.string.LOG_TAG), "Regex match : " + matcherObject.group(1));
globalScoreBuilder.append(matcherObject.group(1) + " ");
global_scores[rowCount][nextFreePointer] = matcherObject.group(1);
nextFreePointer++;
}
if (matcherObject.group(2) != null) {
Log.d(getActivity().getResources().getString(R.string.LOG_TAG), "Regex match : " + matcherObject.group(2));
globalScoreBuilder.append(matcherObject.group(2) + " ");
global_scores[rowCount][nextFreePointer] = matcherObject.group(2);
nextFreePointer++;
}
if (nextFreePointer > 2) {
nextFreePointer = 0;
rowCount++;
}
globalScoreBuilder.append("\n");
}
StringBuilder sb = new StringBuilder();
String lineSeparator = System.getProperty("line.separator");
for (String[] row : global_scores) {
sb.append(Arrays.toString(row)).append(lineSeparator);
}
String text = sb.toString();
TopScores.append("Global Top 10 Scores\n");
TopScores.append(text);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
public class AsyncOperation extends AsyncTask<String, Void, Void>{
protected void onPreExecute(){
}//end of onPreExecute
#Override
protected Void doInBackground(Void... values) {
}//doinBackground
protected void onProgressUpdate(Void... values){
}//onProgressUpdate
protected void onPostExecute(Void... result){
}//end of onPostExecute
}//end of AsyncOperation inner class
}//end of Leaderboards class
You should fetch your game score through a WebService class that extentds AsynTask. Below is my class that I am using in order to fetch remote data safely.
CODE:
public class WebServiceRestTask extends AsyncTask<HttpUriRequest, Void, Object> {
private static final String TAG = "WebServiceRestTask";
private AbstractHttpClient mClient;
private WeakReference<WebServiceRestCallback> mCallback;
private int ws_task;
public WebServiceRestTask(int ws_task) {
this(new DefaultHttpClient(), ws_task);
}
public WebServiceRestTask(AbstractHttpClient client, int task_number) {
mClient = client;
this.ws_task = task_number;
}
public interface WebServiceRestCallback {
public void onRequestSuccess(String response);
public void onRequestError(Exception error);
}
public void setResponseCallback(WebServiceRestCallback callback) {
mCallback = new WeakReference<WebServiceRestCallback>(callback);
}
#Override
protected Object doInBackground(HttpUriRequest... params) {
try {
HttpUriRequest request = params[0];
HttpResponse serverResponse = mClient.execute(request);
BasicResponseHandler handler = new BasicResponseHandler();
String response = handler.handleResponse(serverResponse);
return response + ws_task;
} catch (Exception e) {
Log.w(TAG, e);
return e;
}
}
#Override
protected void onPostExecute(Object result) {
if (mCallback != null && mCallback.get() != null) {
if (result instanceof String) {
mCallback.get().onRequestSuccess((String) result);
} else if (result instanceof Exception) {
mCallback.get().onRequestError((Exception) result);
} else {
mCallback.get().onRequestError(
new IOException("Unknown Error Contacting Host"));
}
}
}
}
Not at my workstation but think something like this should work.
public class AsyncOperation extends AsyncTask<String, Void, Void>{
private String[][] global_scores = new String[10][3];
protected void onPreExecute(){
// optionally show loading indicator
TopScores.append("\n");
}//end of onPreExecute
#Override
protected Void doInBackground(Void... values) {
try {
URL url = new URL("http://62........./high_scores");
HttpURLConnection con = (HttpURLConnection) url.openConnection();
readStream(con.getInputStream());
} catch (Exception e) {
e.printStackTrace();
}
}//doinBackground
protected void onProgressUpdate(Void... values){
}//onProgressUpdate
protected void onPostExecute(Void... result){
// optionally hide loading indicator
StringBuilder sb = new StringBuilder();
String lineSeparator = System.getProperty("line.separator");
for (String[] row : global_scores) {
sb.append(Arrays.toString(row)).append(lineSeparator);
}
String text = sb.toString();
TopScores.append("Global Top 10 Scores\n");
TopScores.append(text);
}//end of onPostExecute
private void readStream(InputStream in) {
BufferedReader reader = null;
try {
StringBuilder htmlIn = new StringBuilder();
StringBuilder globalScoreBuilder = new StringBuilder();
htmlIn.append("");
reader = new BufferedReader(new InputStreamReader(in));
String line = "";
while ((line = reader.readLine()) != null) {
htmlIn.append(line);
}
// String to be scanned to find the pattern.
String html = htmlIn.toString();
String regexPattern = "<td align=\"left\" style=\"padding-left:10px;\">(\\d+?)</td>|<td align=\"right\" style=\"padding-right:10px;\">(\\w+?)</td>";
// Create a Pattern object
Pattern patternObject = Pattern.compile(regexPattern);
// Now create matcher object.
Matcher matcherObject = patternObject.matcher(html);
Log.d(getActivity().getResources().getString(R.string.LOG_TAG), "Trying to find regex matches");
int nextFreePointer = 0;
int rowCount = 0;
while (matcherObject.find()) {
if (matcherObject.group(1) != null) {
Log.d(getActivity().getResources().getString(R.string.LOG_TAG), "Regex match : " + matcherObject.group(1));
globalScoreBuilder.append(matcherObject.group(1) + " ");
global_scores[rowCount][nextFreePointer] = matcherObject.group(1);
nextFreePointer++;
}
if (matcherObject.group(2) != null) {
Log.d(getActivity().getResources().getString(R.string.LOG_TAG), "Regex match : " + matcherObject.group(2));
globalScoreBuilder.append(matcherObject.group(2) + " ");
global_scores[rowCount][nextFreePointer] = matcherObject.group(2);
nextFreePointer++;
}
if (nextFreePointer > 2) {
nextFreePointer = 0;
rowCount++;
}
globalScoreBuilder.append("\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}//end of AsyncOperation inner class
i have create an android application on where the user can select the start and end point of the location.
This application will use the Google-Direction web service and make the HTTPRequest.
I will make this as short, I want to call the asynctask method in the JSONParser class from the main_activity.
The issue is, I don't know how to display the result in the main_activtiy method
here is the asynctask method
public class JSONParser {
InputStream is = null;
JSONObject jObj = null;
String json = "";
public JSONParser() {
}
public void getJSONFromUrl(final String url, final responseListener target) {
new AsyncTask<Void, Void, String>() {
protected String doInBackground(Void... params) {
HttpURLConnection httpURLConnection = null;
StringBuilder stringBuilder = new StringBuilder();
try {
httpURLConnection = (HttpURLConnection) new URL(url).openConnection();
InputStreamReader inputStreamReader = new InputStreamReader(httpURLConnection.getInputStream());
int read;
char[] buff = new char[1024];
while ((read = inputStreamReader.read(buff)) != -1) {
stringBuilder.append(buff, 0, read);
}
return stringBuilder.toString();
} catch (MalformedURLException localMalformedURLException) {
return "";
} catch (IOException localIOException) {
return "";
} finally {
if (httpURLConnection != null)
httpURLConnection.disconnect();
}
}
protected void onPostExecute(String result) {
super.onPostExecute(result);
target.onResponseComplete(result);
}
}.execute();
}
here is how the main method is calling the method
new JSONParser().getJSONFromUrl(url, new responseListener() {
#Override
public void onResponseComplete(String response) {
try {
ArrayList<HashMap<String, Object>> list = new ArrayList<HashMap<String, Object>>();
JSONArray step = new JSONObject(response).getJSONArray("routes").getJSONObject(0).getJSONArray("legs")
.getJSONObject(0).getJSONArray("steps");
for (int i = 0; i < step.length(); i++) {
HashMap<String,Object> row = new HashMap<String,Object>();
row.put("Distance", step.getJSONObject(i).getJSONObject("distance").getString("text"));
list.add(row);
}
}catch (Exception e){
e.printStackTrace();
}
}
});
}
the issue right know is how i want to display the Arraylist List value and put it into the TextView call jarak
You can change your List to be
ArrayList<HashMap<String, String>>
as you are getting a string from
step.getJSONObject(i).getJSONObject("distance").getString("text")
To get it out you can use (assuming your textview is called jarak)
for(HashMap<String,String> map : list) {
for(Entry<String, String> entry : map.entrySet()) {
jarak.setText(entry.getKey() + ", " + entry.getValue());
}
}
Hope that helps