Doing HTTP POST with the current SDK

Moons · by **Moons** » Thu Apr 23, 2009 8:35 am

First of all, I want to thank plusminus for all the work he's done.

I was looking forward to HTTP POST data from my android app with the current SDK, and actually it is pretty simple :

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public void MyFunction{
 
                HttpClient httpclient = new DefaultHttpClient();
 
                //Your URL
 
                HttpPost httppost = new HttpPost("http://www.myurl.com/script.php");
 
                try {
 
                        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
 
                        //Your DATA
 
                        nameValuePairs.add(new BasicNameValuePair("id", "12345"));
 
                        nameValuePairs.add(new BasicNameValuePair("stringdata", "AndDev is Cool!"));
 
                        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
 
                        HttpResponse response;
 
                        response=httpclient.execute(httppost);
 
                } catch (ClientProtocolException e) {
 
                        // TODO Auto-generated catch block
 
                        e.printStackTrace();
 
                } catch (IOException e) {
 
                        // TODO Auto-generated catch block
 
                        e.printStackTrace();
 
                }
 
}
 
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And here it is!

wadael · by **wadael** » Tue May 26, 2009 8:45 pm

HI Moons,

Thanks a lot for your code, you saved me time as I'm new to Android.
I did some refactoring so that it can be used and reused in one's projects.

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package org.wadael.android.utils.net;
 
import java.io.IOException;
 
import java.util.ArrayList;
 
import java.util.Iterator;
 
import java.util.List;
 
import java.util.Map;
 
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;
 
/**
 
 * A refactoring of the code provided by Moons on this page
 
 * http://www.anddev.org/doing_http_post_w ... t5911.html
 
 * 
 
 * Allows to send POST requests to a configurable server
 
 * 
 
 * @author Moons, Wadael
 
 *
 
 */
 
public class HTTPPoster {
 
        public static HttpResponse doPost(String url, Map<String, String> kvPairs)
 
                        throws ClientProtocolException, IOException {
 
                HttpClient httpclient = new DefaultHttpClient();
 
                HttpPost httppost = new HttpPost(url);
 
                if (kvPairs != null && kvPairs.isEmpty() == false) {
 
                        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(
 
                                        kvPairs.size());
 
                        String k, v;
 
                        Iterator<String> itKeys = kvPairs.keySet().iterator();
 
                        while (itKeys.hasNext()) {
 
                                k = itKeys.next();
 
                                v = kvPairs.get(k);
 
                                nameValuePairs.add(new BasicNameValuePair(k, v));
 
                        }
 
                        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
 
                }
 
                HttpResponse response;
 
                response = httpclient.execute(httppost);
 
                return response;
 
        }
 
}
 
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Usage : in the onClick of a button.
SERVER is a URI constant (="http://.......")

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public void onClick(View v) {
 
                                String url = SERVER.toASCIIString();
 
                                Map<String, String> kvPairs = new HashMap<String, String>();
 
                                kvPairs.put("key1","value1");
 
                                kvPairs.put("key2","value2");
 
                                try {
 
                                        HttpResponse re = HTTPPoster.doPost(url, kvPairs);
 
                                } catch (ClientProtocolException e) {
 
                                        e.printStackTrace();
 
                                } catch (IOException e) {
 
                                        e.printStackTrace();
 
                                        // Do something 
 
                                }
 
                        }
 
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wadael · by **wadael** » Tue May 26, 2009 9:43 pm

Now, if anybody knows how to retreive the content of the response, that would be good

kali · by **kali** » Tue Jun 02, 2009 6:34 am

hai moons,
would you teach me how whole code is working with complete samplecode.

pls!!!

blade · by **blade** » Sat Jun 06, 2009 8:56 am

@wadael

I found solution here - gotta give man credits for this.

Anyway, it seem that code below would do the trick

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temp1 = EntityUtils.toString(httpResponse.getEntity()); 
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I used the code Moons supplied and added the code above and it works...

wadael · by **wadael** » Sat Jun 06, 2009 9:45 pm

Hi Blade,

Thanks for your post. I had tried it before, and it didn't work so I retried.
My pblm was in my code answering to the POST request

I've added this method to my class

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ublic static String getPOSTResponse(String url, Map<String, String> kvPairs) throws .... 
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But finally, I will not use it.
I'd advise you to use the method returning the HttpResponse as it leaves open the posssibility to use the status code (404 ? 200, 500 ?) between other possibilities.

Because one should not assume that the network is reliable.

Thanks.

Jerome

blade · by **blade** » Mon Jun 08, 2009 12:03 pm

Variable httpResponse is actually of type HttpResponse...

You can get HTTP Status Code by using:

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int statusCode = httpResponse.getStatusLine().getStatusCode();
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androiddev53 · by **androiddev53** » Wed Jun 17, 2009 4:39 am

I am trying to post an url, for example http://www.google.com & fetch the page.How can I do it on android 1.5?
can somebody guide me with it?

Thanks & Regards,
androiddev53

vegolath · by **vegolath** » Mon Aug 03, 2009 8:23 pm

Well, i decided to combine the the code above with the code from plusminus's tutorial (Thanks)-
Doing HTTP Post with Android (sorry for not adding the actually url, the form engine doesn't let me), to make it supported by the current sdk. Note that instead of using Notification Manager I used a simple text view (cus I'm lazy):

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package com.vegolath.getandposttest;
 
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
 
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.apache.http.util.ByteArrayBuffer;
 
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
 
public class GetAndPost extends Activity {
    
        TextView tv;
        String text;
        
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        tv = (TextView)findViewById(R.id.textveiw);
        text = "";
        
        postData();
    }
    
    public void postData(){  
        
                    // Create a new HttpClient and Post Header  
                    HttpClient httpclient = new DefaultHttpClient();  
                    HttpPost httppost = new HttpPost("http://www.anddev.org/postresponse.php");  
 
                try {  
                        // Add your data  
                        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);  
                        nameValuePairs.add(new BasicNameValuePair("mydata", "Mek Mek"));    
                        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));  
        
                        // Execute HTTP Post Request  
                        HttpResponse response = httpclient.execute(httppost);
                        
                        InputStream is = response.getEntity().getContent();
                        BufferedInputStream bis = new BufferedInputStream(is);
                        ByteArrayBuffer baf = new ByteArrayBuffer(20);
 
                         int current = 0;  
                         while((current = bis.read()) != -1){  
                                baf.append((byte)current);  
                         }  
                           
                        /* Convert the Bytes read to a String. */  
                        text = new String(baf.toByteArray()); 
                        tv.setText(text);
        
                } catch (ClientProtocolException e) {  
                        // TODO Auto-generated catch block  
                } catch (IOException e) {  
                        // TODO Auto-generated catch block  
                }  
        }
}
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Thanks!

sandis84 · by **sandis84** » Wed Aug 26, 2009 8:13 pm

Very nice tutorial, thanks! I have got it working with posting to a server and getting reply. However I fail to add any content when posting to a form. I simply post "null". Could someone explain how to post to this form:

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    <form action="/sign" method="post">
 
      <div><textarea name="content" rows="3" cols="60"></textarea></div>
 
      <div><input type="submit" value="Post Greeting" /></div>
 
    </form>
 
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Ressor · by **Ressor** » Wed Oct 14, 2009 11:53 pm

I'm just starting out and need a little basic help. I've been able to create the HelloAndriod test applicaiton so at least I'm that far, but when I cut and past Vegolath's code into the getandposttest.java file in src on my exclipse dev environment project, I get errors on a few lines. I'm not sure if this code should go into the main .java file and overwrite it all under src or be added as another file.

The errors I see are for the lines below:

Line: public class GetAndPost extends Activity
Error: The public type GetAndPost must be defined in its own file

Line: tv = (TextView)findViewById(R.id.textveiw);
Error: R.id cannot be resolved

Thank you for your patiences and help...

Ressor · by **Ressor** » Thu Oct 15, 2009 12:32 am

Ok...resolved the first error by changing the .java file name to match the public class.

Still can't figure out the other syntax error listed above.

burakkilic · by **burakkilic** » Fri Oct 16, 2009 4:10 pm

Thanks for this. Now I am trying to read an xml file into a string and Post that string. How can I achieve this?

wander · by **wander** » Sat Feb 06, 2010 8:19 pm

hi , vegolath.
if i want post the mail and password to https://mail.google.com/mail/x/ .and fetch current account mail subject list...how to do it?

like this:you can see the style on android display .
how_to_do_fetch_gmail_subject_list-t10862.html

mwq27 · by **mwq27** » Wed Feb 17, 2010 6:55 pm

vegolath wrote:Well, i decided to combine the the code above with the code from plusminus's tutorial (Thanks)-
Doing HTTP Post with Android (sorry for not adding the actually url, the form engine doesn't let me), to make it supported by the current sdk. Note that instead of using Notification Manager I used a simple text view (cus I'm lazy):

Syntax: [ Download ] [ Hide ]
Syntax: [ Download ] [ Show ]
Using java Syntax Highlighting

package com.vegolath.getandposttest;

import java.io.BufferedInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.util.ArrayList;

import java.util.List;

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.apache.http.util.ByteArrayBuffer;

import android.app.Activity;

import android.os.Bundle;

import android.widget.TextView;

public class GetAndPost extends Activity {

TextView tv;

String text;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

tv = (TextView)findViewById(R.id.textveiw);

text = "";

postData();

}

public void postData(){

// Create a new HttpClient and Post Header

HttpClient httpclient = new DefaultHttpClient();

HttpPost httppost = new HttpPost("http://www.anddev.org/postresponse.php");

try {

// Add your data

List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);

nameValuePairs.add(new BasicNameValuePair("mydata", "Mek Mek"));

httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

// Execute HTTP Post Request

HttpResponse response = httpclient.execute(httppost);

InputStream is = response.getEntity().getContent();

BufferedInputStream bis = new BufferedInputStream(is);

ByteArrayBuffer baf = new ByteArrayBuffer(20);

int current = 0;

while((current = bis.read()) != -1){

baf.append((byte)current);

}

/* Convert the Bytes read to a String. */

text = new String(baf.toByteArray());

tv.setText(text);

} catch (ClientProtocolException e) {

// TODO Auto-generated catch block

} catch (IOException e) {

// TODO Auto-generated catch block

}

}

}

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Thanks!

I am running into a small problem. The code runs correctly and doesnt show any errors, but nothing is posting on the screen. It just stays black, I think theres something wrong with my main.xml file, Im new to this so what should my textview look like?
heres my textview:

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/textview"

android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor = "#fff"
/>
Thanks

Doing HTTP POST with the current SDK

Doing HTTP POST with the current SDK

Refactored

HttpREsponse is richer

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