Develop Reference

Getting message from JSon

I wrote the code below to get a simple message from a file php that send me a json object, I have no errors in my code and the PHP code work well, can you please help me to find what is the matter with my code :)
JAVA Code :
package com.example.httpclient;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
public class MainActivity extends Activity {
TextView myListView;
#Override
protected void onCreate(Bundle savedInstanceState) {
try{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//This is our textView element
myListView = (TextView) findViewById(R.id.textView1);
//Lets try to connect
try{
//Create a new client object
HttpClient httpclient = new DefaultHttpClient();
//Now post to your demo URL
HttpPost httppost = new HttpPost("http://goldengym.ma/test/test1.php");
//Execute the post and get the response
HttpResponse response = httpclient.execute(httppost);
//Get the message from the response
HttpEntity entity = response.getEntity();
//Get the content of the message
InputStream webs = entity.getContent();
//Convert response to string
try{
BufferedReader reader = new BufferedReader(new InputStreamReader(webs, "iso-8859-1"), 8);
//Read one line of the response
myListView.setText(reader.readLine());
//Slow our inputStream
webs.close();
}catch(Exception e){
Log.e("log_tag", "Error converting result " + e.toString());
}
}catch(Exception e){
Log.e("log_tag", "Error in http connection " + e.toString());
}
}catch (Exception e){
Log.e("log_tag", "Error " + e.toString());
}
}
}
And there is the PHP Code :
<?php
$result = 'TEST WORKED, WE GOT CONNECTION';
print json_encode($result);
?>
And there is my logcat :
03-03 12:35:02.918: I/ActivityManager(1995): Force stopping package com.example.httpclient uid=10118
03-03 12:35:04.518: W/PackageManager(1995): Code path for pkg : com.example.httpclient changing from /data/app/com.example.httpclient-2.apk to /data/app/com.example.httpclient-1.apk
03-03 12:35:04.518: I/ActivityManager(1995): Force stopping package com.example.httpclient uid=10118
03-03 12:35:04.518: W/PackageManager(1995): Resource path for pkg : com.example.httpclient changing from /data/app/com.example.httpclient-2.apk to /data/app/com.example.httpclient-1.apk
03-03 12:35:05.218: I/ActivityManager(1995): Force stopping package com.example.httpclient uid=10118
03-03 12:35:05.493: D/Launcher.LauncherModel(5871): --> package:com.example.httpclient
03-03 12:35:05.723: D/Launcher.LauncherModel(5871): --> update package com.example.httpclient
03-03 12:35:05.723: D/Launcher.LauncherModel(5871): --> package:com.example.httpclient
03-03 12:35:05.913: V/BackupManagerService(1995): updatePackageParticipantsLocked: com.example.httpclient
03-03 12:35:06.188: D/PackageBroadcastService(2465): Received broadcast action=android.intent.action.PACKAGE_REMOVED and uri=com.example.httpclient
03-03 12:35:06.523: V/BackupManagerService(1995): updatePackageParticipantsLocked: com.example.httpclient
03-03 12:35:07.598: W/DeepLinking(3458): no deep link install data found for com.example.httpclient
03-03 12:35:07.663: D/PackageBroadcastService(2465): Received broadcast action=android.intent.action.PACKAGE_ADDED and uri=com.example.httpclient
03-03 12:35:07.703: D/PackageAddedReceiver(2234): package added com.example.httpclient
03-03 12:35:08.048: D/PackageBroadcastService(2465): Received broadcast action=android.intent.action.PACKAGE_REPLACED and uri=com.example.httpclient

package com.example.httpclient;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import android.os.Build;
import android.os.Bundle;
import android.os.StrictMode;
import android.annotation.TargetApi;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.widget.TextView;
public class MainActivity extends Activity {
TextView myListView;
#TargetApi(Build.VERSION_CODES.GINGERBREAD)
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//This is our textView element
myListView = (TextView) findViewById(R.id.tv);
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
//Lets try to connect
try{
//Create a new client object
HttpClient httpclient = new DefaultHttpClient();
//Now post to your demo URL
HttpPost httppost = new HttpPost("http://10.0.2.2/testAndroid/test1.php");
//Execute the post and get the response
HttpResponse response = httpclient.execute(httppost);
//Get the message from the response
HttpEntity entity = response.getEntity();
//Get the content of the message
InputStream webs = entity.getContent();
//Convert response to string
try{
BufferedReader reader = new BufferedReader(new InputStreamReader(webs, "iso-8859-1"), 8);
//Read one line of the response
myListView.setText(reader.readLine());
//Slow our inputStream
webs.close();
}catch(Exception e){
Log.e("log_tag", "Error converting result " + e.toString());
}
}catch(Exception e){
Log.e("log_tag", "Error in http connection " + e.toString());
}
}
#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;
}
}
PLz try this code, It is working fine. There should use
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
and Manifeast
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.httpclient"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.provider.testdemo.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

Network calls made on the main Thread are disallowed (http://developer.android.com/reference/android/os/NetworkOnMainThreadException.html)
Also, you need <uses-permission android:name="android.permission.INTERNET"/> in your AndroidManifest.xml file.
Never use Exception to handle your exceptions.
Also, I would try to avoid putting a try-catch into an other try-catch.

do it as follows:
public class MyAsyncTask extends AsyncTask<String, String, String> {
private TextView myListView;
public MyAsyncTask(TextView myListView){
this.myListView = myListView;
}
#Override
protected String doInBackground(String... params) {
String response = null;
HttpClient httpclient = new DefaultHttpClient();
//Now post to your demo URL
HttpPost httppost = new HttpPost(params[0]);
//Execute the post and get the response
HttpResponse response = httpclient.execute(httppost);
//Get the message from the response
HttpEntity entity = response.getEntity();
//Get the content of the message
InputStream webs = entity.getContent();
//Convert response to string
try{
BufferedReader reader = new BufferedReader(new InputStreamReader(webs, "iso-8859-1"), 8);
response = reader.readLine();
}catch(Exception e){
Log.e("log_tag", "Error converting result " + e.toString());
}finally{
webs.close();
}
return response;
}
#Override
protected void onPostExecute(String result) {
if(result != null){
myListView.setText(result);
}
}
In onCreate() of your activity:
new MyAsyncTask(myListView).execute("http://goldengym.ma/test/test1.php");
The key method of AsyncTask is doInBackground(), which performs the lengthy operations on a separate thread, while onPostExecute works on the main thread. Refer AsyncTask documentation for more detail. Also, before making any call to server, you should always check first, whether internet is available. I had not posted that part here. Hope this helps.

You can not do the internet operations on main thread. It will give you mainThreadException.
You have to use Asynctask for doing these operations. Then only your able to fetch data from the web services.
http://www.vogella.com/tutorials/AndroidBackgroundProcessing/article.html
You can use this link to understand how it works.

Connecting to WCF webservices using JSON on Android

Recently i am developing Android applications
what i wanted to do is consume a web services
from .net WCF into my application
Here is my Client Code
import java.io.InputStream;<br>
import java.io.InputStreamReader;
import org.apache.http.HttpEntity;<br>
import org.apache.http.HttpResponse;<br>
import org.apache.http.client.methods.HttpGet;<br>
import org.apache.http.impl.client.DefaultHttpClient;<br>
import org.json.JSONObject;<br>
import android.R.string;<br>
import android.os.Bundle;<br>
import android.app.Activity;<br>
import android.view.Menu;<br>
import android.view.View;<br>
import android.widget.TextView;<br>
public class MyPamIndex extends Activity {
private final static String SERVICE_URI = "http://172.30.2.95:9000/JSON/MyPam.svc";
private TextView NabVals;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_pam_index);
NabVals = (TextView)findViewById(R.id.textView2);
}
public void OnRefreshClick(View button)
{
try {
// Send GET request to <service>/GetVehicle/<plate>
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet request = new HttpGet(SERVICE_URI + "/ProductID/" + "1");
request.setHeader("Accept", "application/json");
request.setHeader("Content-type", "application/json");
HttpResponse response = httpClient.execute(request);
HttpEntity responseEntity = response.getEntity();
// Read response data into buffer
char[] buffer = new char[(int)responseEntity.getContentLength()];
InputStream stream = responseEntity.getContent();
InputStreamReader reader = new InputStreamReader(stream);
reader.read(buffer);
stream.close();
JSONObject vehicle = new JSONObject(new String(buffer));
NabVals.setText(vehicle.getString("NabValue"));
// Populate text fields
} catch (Exception e) {
e.printStackTrace();
}
}
when i run the apps it have an error
in
HttpResponse response = httpClient.execute(request);
i have search the entire forum but found nothing
i already add my android manifest file but still does not working
please help me
this is my Manifest file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.core.mypam"
android:versionCode="1"
android:versionName="1.0" >
<uses-permission android:name="anroid.permission.INTERNET"></uses-permission>
<uses-sdk
android:minSdkVersion="7"
android:targetSdkVersion="16" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.core.mypam.MyPamIndex"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
"http://172.30.2.95:9000" is not my machine IP but its located on other PC within same LAN
Please help me

You're making a network request on the UI thread. That is no longer allowed and, and will raise an exception. You need to move your code into an AsyncTask. Google NetworkOnMain for a plethora of examples.

Not Able to Make HTTPConnection

I'm new to android development n i'm trying to make HTTPConnection.
I make two files one is ParsingActivity.java(Main Activity File)and other one is XMLParser.java (For setting up the HTTPRClient Request).
ParserActivity.java
package ok.done;
import android.app.Activity;
import android.os.Bundle;
public class ParsingActivity extends Activity {
String URL = "http://api.androidhive.info/pizza/?format=xml";
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
System.out.println("t1==========>"+URL);
XMLParser parser = new XMLParser();
String xml = parser.getXmlFromUrl(URL);
System.out.println("t2==========>"+xml);
}
}
XMLParsing.java
package ok.done;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
public class XMLParser {
// constructor
public XMLParser() {
}
public String getXmlFromUrl(String url) {
String xml = null;
System.out.println("t3==========>"+xml);
System.out.println("t4==========>"+url);
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
System.out.println("t5==========>"+url);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
xml = EntityUtils.toString(httpEntity);
System.out.println("t6==========>"+xml);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// return XML
return xml;
}
}
I also add the permission in the AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="ok.done"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name" >
<activity
android:label="#string/app_name"
android:name=".ParsingActivity" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
</manifest>
And the LogCat result for my System.out.println are
for t1==========>http://api.androidhive.info/pizza/?format=xml
t3==========>null
t4==========>http://api.androidhive.info/pizza/?format=xml
t5==========>null
t6==========>null
t2==========>null
but if everything is perfect in my this simple code thein for the result of t6,t2 is the xml file description.
Any one plz suggest me what should I do or any other links which will be helpful for me for creating XML parsing type application.
Thanks In Advance.

Are you sure that the http server gives a valid xml after firing. To make sure fire the url on web browser, if server gives the xml, you will get the xml content.

Android post JSON

hy,
I'd like to insert a person into the database, so I have to post the name and firstname
here is json url http://localhost:8075/myproject/personne/new
I thought to use
Map map = new HashMap ();
map.put ("name", "aaaaa");
map.put ("firstname", "eee");
but , I do not know WHAT TO DO to post the variables in the server.

you have to create a server side page, for example insert.php.
Then make httppost from your android application to server side page("insert.php")
here is an example about connect to remote database in android

I'm assuming you already have your server up and running (so it's already accepting and handling post requests). Please also use an IDE that manages the imports automatically, I just added them for reference.
Following code is copy/paste from one of my projects and untested (please also excuse invalid references I might have missed).
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
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.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
private Response execute(String jsonData) {
String url = "http://localhost:8075/myproject/personne/new";
HttpPost post = new HttpPost(url);
ArrayList<NameValuePair> parameters = new ArrayList<NameValuePair>();
parameters.add(new BasicNameValuePair("data", jsonData));
try {
post.setEntity(new UrlEncodedFormEntity(parameters));
HttpClient httpClient = new DefaultHttpClient();
HttpResponse response = httpClient.execute(post);
return parseResponse(response);
} catch (UnsupportedEncodingException e) {
Log.e(TAG, "Unsupported encoding in JSON data", e);
} catch (ClientProtocolException e) {
Log.e(TAG, "Protocol based error", e);
} catch (IOException e) {
Log.e(TAG, "IO Exception", e);
}
return null;
}
private Response pushPerson(Person person) {
try {
JSONObject json = new JSONObject();
json.put("firstname", person.firstname);
json.put("lastname", person.lastname);;
return execute(json.toString());
} catch (JSONException e) {
Log.e(TAG, "Error pushing person", e);
}
return null;
}
As you can see there's no need for a HashMap, the JSONObject is what you are looking for. The Response can be nearly anything, that's up to you. "Normally" you would return the id of the newly created person.
There are plenty of tutorials out there. When I started I found each of them just by using a search engine. Please also always take a look at the Android docs.

Error in http connection

hi I am trying to fetch data from link as given below
http://abovestress.com/app_stress/fetch_all_detail.php?task=fetchtimefromdateanduserid&track_date=2011-08-09&tracker_user_id=374
but I can't get result my code is here
package com.JsonDemo;
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.app.Activity;
import android.os.Bundle;
import android.util.Log;
public class JsonDemoActivity extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ArrayList<String> fetchsosfromID = new ArrayList<String>();
String result = "";
InputStream is = null;
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("track_date","2011-08-09"));
nameValuePairs.add(new BasicNameValuePair("tracker_user_id",""+374));
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(
"http://abovestress.com/app_stress/fetch_all_detail.php?task=fetchtimefromdateanduserid&");
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 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();
result = sb.toString();
Log.v("log_tag", "Append String " + result);
} catch (Exception e) {
Log.e("log_tag", "Error converting result " + e.toString());
}
// parse json data
try {
JSONArray jArray = new JSONArray(result);
for (int i = 0; i < jArray.length(); i++) {
JSONObject json_data = jArray.getJSONObject(i);
fetchsosfromID.add(json_data.getString("track_time"));
Log.v("log_tag", "daily_data " + fetchsosfromID);
}
} catch (JSONException e) {
Log.e("log_tag", "Error parsing data " + e.toString());
}
}
}
and error comes like this
08-09 17:29:01.315: ERROR/log_tag(2291): Error in http connection java.net.UnknownHostException: abovestress.com
08-09 17:29:01.315: ERROR/log_tag(2291): Error converting result java.lang.NullPointerException
08-09 17:29:01.345: ERROR/log_tag(2291): Error parsing data org.json.JSONException: End of input at character 0 of
manifiest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.JsonDemo"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="9" />
<application android:icon="#drawable/icon" android:label="#string/app_name">
<activity android:name=".JsonDemoActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<uses-permission android:name="android.permission.INTERNET"/>
</application>
</manifest>

You've definitely added the
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
in your manifest, right?
Edit: Your <uses-permission> is in the wrong place. It should look like this:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.JsonDemo"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="9" />
<uses-permission android:name="android.permission.INTERNET"/>
<application android:icon="#drawable/icon" android:label="#string/app_name">
<activity android:name=".JsonDemoActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

you need to put permission tag put of application tag...

The exception you get points to a name resolution problem (getting abovestress.com ip address from DNS server). That is probably because your network is down.
A simple snippet to check if a network connection is up, where Context ctx is you Activity context:
public boolean checkConnection(Context ctx) {
ConnectivityManager conMgr =
(ConnectivityManager)ctx.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo i = conMgr.getActiveNetworkInfo();
if (i == null)
return false;
if (!i.isConnected())
return false;
if (!i.isAvailable())
return false;
return true;
}
EDIT:
if network in not your problem, have a look here and here
you may need to add (besides android.permission.INTERNET) other permissions:
android.permission.ACCESS_NETWORK_STATE
android.permission.READ_PHONE_STATE
and/or:
try {
InetAddress i = InetAddress.getByName(URLName);
} catch (UnknownHostException e1) {
e1.printStackTrace();
}
// ... actually using URL
EDIT 2: AND, as noted by others, uses-permission element goes inside manifest element, not application element