Develop Reference

close android program Immediately run the app in json

hi every body i wrote a program to get data from server and show the data in list view with json
but when i start the app ,app immediately closed.
i checked my manifest and its okay , idont know what should i do , please help me!
Main Activity code:
package com.example.delta.travel;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ListAdapter;
import android.widget.SimpleAdapter;
import android.widget.Toast;
import org.apache.http.NameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
public class MainActivity extends ListActivity {
private ProgressDialog pd;
JSONParser jParser=new JSONParser();
ArrayList<HashMap<String,String>> P;
JSONArray s=null;
private final String url="http://192.168.1.4/upload/travel.php";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new travel().execute();
}
class travel extends AsyncTask<String,String,String>{
#Override
protected void onPreExecute() {
super.onPreExecute();
pd=new ProgressDialog(MainActivity.this);
pd.setMessage("login");
pd.show();
}
#Override
protected String doInBackground(String... params) {
List<NameValuePair> parms=new ArrayList<>();
JSONObject json=jParser.makeHTTPRequest(url,"GET",parms);
try {
int t=json.getInt("t");
if(t==1){
s=json.getJSONArray("travel");
for(int i=0;i<s.length();i++){
JSONObject c=s.getJSONObject(i);
String companyname=c.getString("companyname");
String cod=c.getString("cod");
String bign=c.getString("bign");
String stop=c.getString("stop");
String date=c.getString("date");
String time=c.getString("time");
String price=c.getString("price");
HashMap<String,String>map=new HashMap<String,String>();
map.put("companyname",companyname);
map.put("cod",cod);
map.put("bign",bign);
map.put("stop",stop);
map.put("date",date);
map.put("time",time);
map.put("price",price);
P.add(map);
}
}else {
Toast.makeText(MainActivity.this,"No DataFound",Toast.LENGTH_SHORT).show();
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
pd.dismiss();
runOnUiThread(new Runnable() {
#Override
public void run() {
ListAdapter adapter = new SimpleAdapter(MainActivity.this, P, R.layout.item_list,
new String[]{"companyname", "cod", "bign", "stop", "date", "time", "price"},
new int[]{R.id.companyname, R.id.cod, R.id.bign, R.id.stop, R.id.date, R.id.time1, R.id.price});
setListAdapter(adapter);
}
});
}
}
}
my JSONParser code:
package com.example.delta.travel;
import android.net.http.HttpResponseCache;
import android.util.Log;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.util.Date;
import java.util.List;
/**
* Created by delta on 5/28/2016.
*/
public class JSONParser {
static InputStream is=null;
static JSONObject jObj=null;
static String json="";
// constructor
public JSONParser(){
}
// function get json from url
// by making HTTP POST or GET method
public JSONObject makeHTTPRequest(String url,String method,
List<NameValuePair> params){
//making HTTP request
try{
//check for request method
if(method=="POST"){
// request method is POST
//defaultHTTPClient
DefaultHttpClient httpClient =new DefaultHttpClient();
HttpPost httpPost=new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(params));
HttpResponse httpResponse=httpClient.execute(httpPost);
HttpEntity httpEntity=httpResponse.getEntity();
is=httpEntity.getContent();
}else if(method=="GET"){
//request method is GET
DefaultHttpClient httpClient=new DefaultHttpClient();
String paramString = URLEncodedUtils.format(params,"utf-8");
url+="?"+paramString;
HttpGet httpGet=new HttpGet(url);
HttpResponse httpResponse=httpClient.execute(httpGet);
HttpEntity httpEntity=httpResponse.getEntity();
is=httpEntity.getContent();
}
}catch (UnsupportedEncodingException e){
e.printStackTrace();
}catch (ClientProtocolException e){
e.printStackTrace();
}catch (IOException e){
e.printStackTrace();
}
try{
BufferedReader reader=new BufferedReader(new InputStreamReader(
is,"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();
}catch (Exception e){
Log.e("Buffer Error","Error Converting result"+e.toString());
}
//try parse the string to a JSON object
try{
jObj=new JSONObject(json);
}catch (JSONException e){
Log.e("JSON Parser","Error parsing data"+e.toString());
}
//return JSON String
return jObj;
}
}
and my travel.php code:
<?php
$con=mysqli_connect("localhost","root","","travels");
mysqli_set_charset($con,"utf8");
$response=array();
$result=mysqli_query($con,"select * from travel");
if(mysqli_num_rows($result)>0){
while($row=mysqli_fetch_array($result)){
$temp=array();
$temp["companyname"]=$row["companyname"];
$temp["cod"]=$row["cod"];
$temp["bign"]=$row["bign"];
$temp["stop"]=$row["stop"];
$temp["date"]=$row["date"];
$temp["time"]=$row["time"];
$temp["price"]=$row["price"];
$response["travel"]=array();
array_push($response["travel"],$temp);
}
$response["t"]=1;
echo json_encode($response);
}
else{
$response["t"]=0;
$response["message"]="Not Found";
echo json_encode($response);
}
?>

1) Change the code in your JSONParser class with this code. use only this fiction.
public JSONObject makeHTTPRequest(String urlString, String method) {
if(method.equals("POST")){
URL url = null;
try {
url = new URL(urlString);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setRequestProperty("Accept", "application/json");
BufferedReader br = new BufferedReader(new InputStreamReader(
(conn.getInputStream())));
String output;
StringBuilder sb = new StringBuilder();
while ((output = br.readLine()) != null) {
sb.append(output);
}
conn.disconnect();
json = sb.toString();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (ProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}else if(method.equals("GET")){
URL url = null;
try {
url = new URL(urlString);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setRequestProperty("Accept", "application/json");
BufferedReader br = new BufferedReader(new InputStreamReader(
(conn.getInputStream())));
String output;
StringBuilder sb = new StringBuilder();
while ((output = br.readLine()) != null) {
sb.append(output);
}
conn.disconnect();
json = sb.toString();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (ProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
e.printStackTrace();
}
return jObj;
}
2) And in MainActivity you have to add P = new ArrayList<>(); in onCreate() method like this.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
P = new ArrayList<>();
new travel().execute();
}
All done it is working at my side. it should definitely work for you too.

Do some changes and see if it works :
new travel().execute(url);
Your AsyncTask :
class travel extends AsyncTask<String,Void,String>{
#Override
protected void onPreExecute() {
super.onPreExecute();
pd=new ProgressDialog(MainActivity.this);
pd.setMessage("login");
pd.show();
}
#Override
protected String doInBackground(String... params) {
// List<NameValuePair> parms=new ArrayList<>();
for(urlString in params){
JSONObject json=jParser.makeHTTPRequest(urlString,"GET");
}
//rest is same
In JSONParser Class :
public class JSONParser {
static InputStream is=null;
static JSONObject jObj=null;
static String json="";
// constructor
public JSONParser(){
}
// function get json from url
// by making HTTP POST or GET method
public JSONObject makeHTTPRequest(String url,String method){
//making HTTP request
try{
//check for request method
if(method=="POST"){
// request method is POST
//defaultHTTPClient
DefaultHttpClient httpClient =new DefaultHttpClient();
HttpPost httpPost=new HttpPost(url);
//httpPost.setEntity(new UrlEncodedFormEntity(params));
HttpResponse httpResponse=httpClient.execute(httpPost);
HttpEntity httpEntity=httpResponse.getEntity();
is=httpEntity.getContent();
}else if(method=="GET"){
//request method is GET
DefaultHttpClient httpClient=new DefaultHttpClient();
///String paramString = URLEncodedUtils.format(params,"utf-8");
//url+="?"+paramString;
HttpGet httpGet=new HttpGet(url);
HttpResponse httpResponse=httpClient.execute(httpGet);
HttpEntity httpEntity=httpResponse.getEntity();
is=httpEntity.getContent();
}
// Rest is same

Converting a JSON response to string using a webservice in android

I am using a webservice to retrieve a JSON and convert it to a string.But i am getting the string as null.
The MainActivity class is:
package com.example.webserviceeg;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.TimeZone;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.app.Dialog;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
Button btnshowdata;
TextView txtdata;
String URL="http://www.footballultimate.com/fifa/index.php/api/matchShedule/";
ProgressBar pb;
HttpResponse response;
String result;
HttpEntity entity;
InputStream is;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnshowdata=(Button) findViewById(R.id.btnshowdata);
txtdata=(TextView) findViewById(R.id.txtdata);
pb=(ProgressBar) findViewById(R.id.progressBar1);
btnshowdata.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
new Retrievevalues().execute();
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public class Retrievevalues extends AsyncTask<String,Void,Void>
{
#Override
protected void onPreExecute() {
pb.setVisibility(View.VISIBLE);
}
#Override
protected Void doInBackground(String... params) {
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(URL);
List<NameValuePair> pairs = new ArrayList<NameValuePair>();
// TimeZone tz = TimeZone.getDefault();
// Date now = new Date();
// int offsetFromUtc = tz.getOffset(now.getTime()) / 1000;
pairs.add(new BasicNameValuePair("time_offset","19800"));
httppost.setEntity(new UrlEncodedFormEntity(pairs));
response = httpclient.execute(httppost);
result=responsetostring.getResponseBody(response);
Toast.makeText(getApplicationContext(),result,Toast.LENGTH_LONG).show();
// txtdata.setText(result);
}catch(Exception e){
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void result) {
pb.setVisibility(View.INVISIBLE);
}
}
}
I am using a second class containing static methods to convert the response object to a string:
responsetostring.java
package com.example.webserviceeg;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import org.apache.http.HeaderElement;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.ParseException;
import org.apache.http.protocol.HTTP;
public class responsetostring {
// Json Response Processing
// Json Response Processing
public static String getResponseBody(HttpResponse response) {
// TODO Auto-generated method stub
String response_text = null;
HttpEntity entity = null;
try {
entity = response.getEntity();
try {
response_text = _getResponseBody(entity);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
return response_text;
}
public static String _getResponseBody(final HttpEntity entity) throws IOException,
ParseException {
if (entity == null) {
throw new IllegalArgumentException("HTTP entity may not be null");
}
InputStream instream = entity.getContent();
if (instream == null) {
return "";
}
if (entity.getContentLength() > Integer.MAX_VALUE) {
throw new IllegalArgumentException(
"HTTP entity too large to be buffered in memory");
}
String charset = getContentCharSet(entity);
if (charset == null) {
charset = HTTP.DEFAULT_CONTENT_CHARSET;
}
Reader reader = new InputStreamReader(instream, charset);
StringBuilder buffer = new StringBuilder();
try {
char[] tmp = new char[1024];
int l;
while ((l = reader.read(tmp)) != -1) {
buffer.append(tmp, 0, l);
}
} finally {
reader.close();
}
return buffer.toString();
}
public static String getContentCharSet(final HttpEntity entity)
throws ParseException {
if (entity == null) {
throw new IllegalArgumentException("HTTP entity may not be null");
}
String charset = null;
if (entity.getContentType() != null) {
HeaderElement values[] = entity.getContentType().getElements();
if (values.length > 0) {
NameValuePair param = values[0].getParameterByName("charset");
if (param != null) {
charset = param.getValue();
}
}
}
return charset;
}
}
But the string result in MainActivity , i am getting it as null.Please help

Change to this:
if (instream != null) {
BufferedReader reader = new BufferedReader(
new InputStreamReader(is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
return sb.toString();
}
else
{
return "";
}

JAVA ANDROID:Reading Php Json values, Eclipse dont see the error but it doesnt work

Reading Php Json values, Eclipse dont see the error but it doesnt work. Im becoming crazy because it must run, can you help me?
When i execute it nothing happens.
This is the java activity code:
package com.json.php;
import android.app.Activity;
import android.os.Bundle;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import android.widget.TextView;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class JSONExampleActivity extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://iatek.eu/sys/getsms.php");
TextView textView = (TextView)findViewById(R.id.textView1);
try {
HttpResponse response = httpclient.execute(httppost);
String jsonResult = inputStreamToString(response.getEntity().getContent()).toString();
JSONObject obj = new JSONObject(jsonResult);
JSONArray jsonArray = obj.getJSONArray("posts");
/*Para hacer prueba accedo a un registro concreto en este caso el 3*/
JSONObject childJSONObject = jsonArray.getJSONObject(3);
String username = childJSONObject.getString("username");
String sms = childJSONObject.getString("sms");
String fcat = childJSONObject.getString("fcat");
textView.setText(""+sms+"--" + username);
/* para hacer pruebas lo he comentado
for (int i = 0; i < jsonArray.length(); i++)
{
JSONObject childJSONObject = jsonArray.getJSONObject(i);
String username = childJSONObject.getString("username");
String sms = childJSONObject.getString("sms");
String fcat = childJSONObject.getString("fcat");
textView.setText(""+sms+"--" + username);
}*/
}
catch (JSONException e) {
e.printStackTrace();
}
catch (ClientProtocolException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
}
private StringBuilder inputStreamToString(InputStream is) {
String rLine = "";
StringBuilder answer = new StringBuilder();
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
try {
while ((rLine = rd.readLine()) != null) {
answer.append(rLine);
}
}
catch (IOException e) {
e.printStackTrace();
}
return answer;
}
}
and here is the json code into iatek.eu/sys/getsms.php
{"posts":[{"cid":"11","username":"Livi","sms":"ag","fto":"","fcat":"cat"},{"cid":"10","username":"Sumone","sms":"","fto":"","fcat":""},{"cid":"9","username":"R2D2","sms":"dw","fto":"wd","fcat":"wd"},{"cid":"5","username":"Roy","sms":"sa","fto":"sa","fcat":"sa"},{"cid":"12","username":"Charles","sms":"ag","fto":"","fcat":"cat"},{"cid":"13","username":"Clarck","sms":"age","fto":"","fcat":"cat"}]}
can someone tell me where is the mistake?
thanks

You cannot run network operation on the main thread.
Use asyncTask instead.
public class JSONExampleActivity extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
new GetSmsTask().execute("http://iatek.eu/sys/getsms.php");
}
private class GetSmsTask extends AsyncTask<String, Void, JSONObject> {
protected JSONObject doInBackground(String... urls) {
JSONObject obj = null;
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url[0]);
HttpResponse response = httpclient.execute(httppost);
String jsonResult = inputStreamToString(response.getEntity()
.getContent()).toString();
obj = new JSONObject(jsonResult);
}
catch (JSONException e) {
e.printStackTrace();
}
catch (ClientProtocolException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
return obj;
}
protected void onPostExecute(JSONObject obj) {
JSONArray jsonArray = obj.getJSONArray("posts");
JSONObject childJSONObject = jsonArray.getJSONObject(3);
String username = childJSONObject.getString("username");
String sms = childJSONObject.getString("sms");
String fcat = childJSONObject.getString("fcat");
textView.setText(""+sms+"--" + username);
}
}
}
EDIT:
I just ran the code myslef, and I got this
09-13 13:33:59.315: W/System.err(14200): org.json.JSONException:
Unterminated object at character 7551 of {"posts":[{......
This means your JSON is invalid
http://pro.jsonlint.com/ paste your link there you will see the error.
To test that the code is working replace this
String jsonResult = inputStreamToString(response.getEntity()
.getContent()).toString();
with this:
String jsonResult = "{\"posts\":" +
"[{\"cid\":\"11\",\"username\":\"Livi\",\"sms\":\"ag\",\"fto\":\"\",\"fcat\":\"cat\"}," +
" {\"cid\":\"11\",\"username\":\"Livi\",\"sms\":\"ag\",\"fto\":\"\",\"fcat\":\"cat\"}, " +
"{\"cid\":\"11\",\"username\":\"Livi\",\"sms\":\"ag\",\"fto\":\"\",\"fcat\":\"cat\"}," +
"{\"cid\":\"11\",\"username\":\"Livi\",\"sms\":\"ag\",\"fto\":\"\",\"fcat\":\"cat\"}]}";

RESOLVED!!!! ALL ITS PERFECT
HERE IS THE CODE
THANK YOU VERY MUCH meda
package com.json.php;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import android.widget.EditText;
import android.widget.TextView;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.json.php.R;
public class JSONExampleActivity extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
new GetSmsTask().execute("http://YOURWEBSITE.eu/sys/getsms.php");
}
private class GetSmsTask extends AsyncTask<String, Void, JSONObject> {
protected JSONObject doInBackground(String... urls) {
JSONObject obj = null;
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(urls[0]);
HttpResponse response = httpclient.execute(httppost);
/* String jsonResult = "{\"posts\":" + //FOR TESTS
"[{\"cid\":\"11\",\"username\":\"Livi\",\"sms\":\"ag\",\"fto\":\"\",\"fcat\":\"cat\"}," +
" {\"cid\":\"11\",\"username\":\"Livi\",\"sms\":\"ag\",\"fto\":\"\",\"fcat\":\"cat\"}, " +
"{\"cid\":\"11\",\"username\":\"Livi\",\"sms\":\"ag\",\"fto\":\"\",\"fcat\":\"cat\"}," +
"{\"cid\":\"11\",\"username\":\"Livi\",\"sms\":\"ag\",\"fto\":\"\",\"fcat\":\"cat\"}]}";
*/
String jsonResult = inputStreamToString(response.getEntity().getContent()).toString();
obj = new JSONObject(jsonResult);
}
catch (JSONException e) {
e.printStackTrace();
}
catch (ClientProtocolException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
return obj;
}
private StringBuilder inputStreamToString(InputStream is) {
String rLine = "";
StringBuilder answer = new StringBuilder();
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
try {
while ((rLine = rd.readLine()) != null) {
answer.append(rLine);
}
}
catch (IOException e) {
e.printStackTrace();
}
return answer;
}
protected void onPostExecute(JSONObject obj) {
JSONArray jsonArray;
try {
jsonArray = obj.getJSONArray("posts");
JSONObject childJSONObject = jsonArray.getJSONObject(3);
String username = childJSONObject.getString("username");
String sms = childJSONObject.getString("sms");
String fcat = childJSONObject.getString("fcat");
TextView textView = (TextView) findViewById(R.id.textView1);
textView.setText(""+sms+"--" + username);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}

Send JSON from Java to PHP through Post

I am doing an Android program that is supposed to send data from the tablet to a PHP Web Service. The code for sending the JSON:
package com.example.shvalidation;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicHeader;
import org.apache.http.protocol.HTTP;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
public class MainMenuScreen extends Activity {
//JSON Variables
JSONParser jsonParser = new JSONParser();
String pid;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_menu_layout);
new TestThread().execute();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main_menu_layout, menu);
return true;
}
public void PlantToDome(View view) {
Intent intent = new Intent(this, SelectLocationScreen.class);
startActivity(intent);
}
//Código del Web Service
public class TestThread extends AsyncTask<Void, Void, Void> {
ProgressDialog dialog;
protected void onPreExecute() {
dialog = ProgressDialog.show(MainMenuScreen.this, "Loading", "Loading data, please wait..");
}
private String convertStreamToString(InputStream is) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
protected Void doInBackground(Void...args0) {
try {
HttpClient client = new DefaultHttpClient();
HttpResponse response;
HttpPost post = new HttpPost("http://192.168.1.101:8080/GetBook.php");
JSONObject holder = new JSONObject();
JSONObject euid = new JSONObject();
euid.put("euid", 1);
holder.accumulate("euids", euid);
euid.put("euid", 2);
holder.accumulate("euids", euid);
post.setHeader("json", holder.toString());
StringEntity se = new StringEntity(holder.toString());
se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
post.setEntity(se);
response = client.execute(post);
if (response != null) {
InputStream in = response.getEntity().getContent();
String a = convertStreamToString(in);
Log.i("Read from Server", a);
}
} catch (Exception e) {
Log.d("error", e.toString());
}
return null;
}
protected void onPostExecute(Void unused) {
dialog.dismiss();
}
}
}
The PHP Web Service:
<?php
ob_start();
var_dump(json_decode(file_get_contents('php://input')));
$out = ob_get_contents();
ob_end_clean();
$f = fopen('out.txt', 'w+');
fwrite($f, html_entity_decode($out));
fclose($f);
?>
I have tried different methods for getting the JSON, but none of them have worked for me. Maybe the fine people of StackOverflow can help me out with this, as they always have for every other problem that I've had.

From the comments section, it appears you only want the JSON being sent to your PHP script. Normally, you post POST this to PHP, and extract it:
<?php
print_r($_POST);
$json_string = $_POST['message'];
$json = json_decode($json_string);
print_r($json);
?>
And then a small client example:
public static void main(String[] args) {
String json = "{\"message\":\"This is a message\"}";
HttpClient httpClient = new DefaultHttpClient();
try {
HttpPost request = new HttpPost("http://somesite.com/test.php");
StringEntity params =new StringEntity("message=" + json);
request.addHeader("content-type", "application/x-www-form-urlencoded");
request.setEntity(params);
HttpResponse response = httpClient.execute(request);
// handle response here...
System.out.println(org.apache.http.util.EntityUtils.toString(response.getEntity()));
org.apache.http.util.EntityUtils.consume(response.getEntity());
} catch (Exception ex) {
// handle exception here
} finally {
httpClient.getConnectionManager().shutdown();
}
}
The output of this is:
Array
(
[message] => {"message":"This is a message"}
)
stdClass Object
(
[message] => This is a message
)

unable to call method

I'm trying to implement ZXing barcode scanner into my program. After getting the scanned result, I wanted to parse the result to a method named getData() which belong to another Java class. No syntax error on IDE, but mysql.getData(contents) won't call the method no matter what. Please advise.
If I put this code under onCreate, the whole program force closed:
package com.posQR.ip;
import com.posQR.ip.MySQL;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class PosQRActivity extends Activity{
MySQL mysql;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mysql.getData("productID");
Button button = (Button)findViewById(R.id.button1);
button.setOnClickListener(scanListener);
}
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
TextView textView = (TextView)findViewById(R.id.textView1);
if (requestCode == 0) {
if (resultCode == RESULT_OK) {
try {
String contents = intent.getStringExtra("SCAN_RESULT");
Toast.makeText(getApplicationContext(), contents + "from main", Toast.LENGTH_LONG).show();
mysql.getData(contents);
String string = Double.toString(mysql.getPrice());
textView.setText(string);
}
catch (Exception e) {
Toast.makeText(getApplicationContext(), "Please scan on the product's QR Code.", Toast.LENGTH_LONG).show();
}
} else if (resultCode == RESULT_CANCELED) {
// Handle cancel
}
}
}
private OnClickListener scanListener = new OnClickListener() {
public void onClick(View v) {
try{
Intent intent = new Intent("com.google.zxing.client.android.SCAN");
intent.putExtra("SCAN_MODE", "QR_CODE_MODE");
startActivityForResult(intent, 0);
}
catch (Exception e){
Toast.makeText(getApplicationContext(), "error opening scanner.", Toast.LENGTH_SHORT).show();
}
}
};
}
.
package com.posQR.ip;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.content.Context;
import android.net.ParseException;
import android.util.Log;
import android.widget.Toast;
public class MySQL{
double Price;
private Context localContext;
public void getData(String productID) {
InputStream is = null;
String result = "";
Toast.makeText(localContext.getApplicationContext(), productID, Toast.LENGTH_LONG).show();
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("id",productID));
//http post
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://dl.dropbox.com/u/11233767/mysqlRequest.php");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
}catch(Exception e){
Log.e("log_tag", "Error in http connection"+e.toString());
}
//convert response to string
try {
BufferedReader br = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = br.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result = sb.toString();
} catch (Exception e) {
// TODO: handle exception
Toast.makeText(localContext.getApplicationContext(), "Error converting result.", Toast.LENGTH_LONG).show();
}
//paring data
try{
JSONArray jArray = new JSONArray(result);
JSONObject json_data=null;
json_data = jArray.getJSONObject(0);
Price=json_data.getDouble("price");
}
catch(JSONException e1){
Toast.makeText(localContext.getApplicationContext(), "No City Found" ,Toast.LENGTH_LONG).show();
} catch (ParseException e1) {
e1.printStackTrace();
}
}
public double getPrice(){
return Price;
}
}

There are many problems here, such as:
the mysql variable is null when you use it in onCreate, you must declare it.
The localContext object in MySql is never initialized, which will cause another NullPointerException when you call getData(). You should create a constructor that accepts a Context object for the MySql class, and use that constructor when you're fixing the first problem. Alternatively you could pass a Context object to getData()
the getData() method accesses the network in the main/UI thread, which will cause another Exception. Call this method in a different thread or spin off a new thread within the method itself. You may want to use an AsyncTask