so these three packages does not support the current version of SDK.

import android.net.http.EventHandler;
import android.net.http.Headers;
import android.net.http.RequestQueue;

I am darn pretty new to Android/Java. But ever since I got my G1 I have just been dying to code on an app that can POST and GET info from a web app (running apache/php/mysql).

So can some one point me somewhere.

What I want is the user to enter a value in an input box and its POSTed to my server and server sends back reply and its printed on the screen. Now I know this very simple and straight forward stuff.

Yes this would be very interesting to know.. I'm also trying to use your tutorial but i can't find RequestQueue, not even in the docs.

I couldnt get it working either, seems SDK 1.0 has made these out of date

I found something here which does the trick

http://blog.richstern.com/?p=32

So how do we POST data with the current SDK?

Hi, everyone.

I'll try to run app so it's error. It's the same question with andbot: three packages does not support the current version of SDK.
import android.net.http.EventHandler;
import android.net.http.Headers;
import android.net.http.RequestQueue;

How can I import some packages?

Thanks,

--Alex

These packages are not in the current SDK, here is how you can POST : doing_http_post_with_the_current_sdk-t5911.html

Hi,

I can see in the other apps, they use some packages the same. So How can I run those app?

Thanks,

--Alex

hello plusminus,
i read complete tutoral
when i run the code i get error over statement:

android.net.http.RequestQueue rQueue = new RequestQueue(this);

i cnat resolve it. would you have any idea bout this error.

the error is : multiple maker at this line
android.net.http.RequestQueue cannot be resolved
to a type

pls help me.

Hi Plus Minus,

I saw your sample code.

I am running Apache Server in my pc.

I created a very small PHP script which will take input.

PHP Script
<?php
echo "POSTed data: '".$_POST['mydata']."'";
?>
Location of the PHP File:
http://localhost/postresponse.php

I wrote few lines of code to Post HTTP Request with String Info:
package http.pack;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import android.app.Activity;
import android.os.Bundle;

public class http_sample extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
String POSTText = null;
try {
POSTText = "mydata=" + URLEncoder.encode("HELLO, ANDROID HTTPPostExample - by anddev.org", "UTF-8");
} catch (UnsupportedEncodingException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}

try {
doPost("http://localhost/postresponse.php", POSTText);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private InputStream doPost(String urlString, String content) throws IOException {
URL url = new URL(urlString);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
InputStream in = null;
OutputStream out;
byte[] buff;
con.setRequestMethod("POST");
URLConnection.setDefaultRequestProperty("Content-Type", "application/x-www-form-urlencoded");
con.setDoOutput(true);
con.setDoInput(true);
con.connect();
out = con.getOutputStream();
buff = content.getBytes("UTF8");
out.write(buff);
out.flush();
out.close();
in = con.getInputStream();
return in;
}
}

Now I get exception error when con.connect(); is hit.
Am I suppose include some thing more.

Please guide me to run this code successfully.

Vishal

Could u pls tell me where can i find android.net.http.RequestQueue api...i am getting error...while creating requestQueue..Like the android.net.http.RequestQueue was not found...also for Header and Iterrator in worker class

also giving error @ Iterator and header class...

also provide code... for geting the response from servlet...instead of PHP...

this could be a really help fr me...

plusminus wrote:

Doing HTTP Post with Android

What you will learn: You will learn how to do HTTP Post from within Android.

Problems/Questions: Write them right below...

Difficulty: 2 of 5

What it will look like:

Description:
0.) HTTP is a request-response protocol. Various types of requests are possible, each identified by a different HTTP method. Here we will use the POST-Method.

1.) So we will once again start, where all Activities start. We will do some simple preparation first:

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Using java Syntax Highlighting

1.         @Override
2.         public void onCreate(Bundle icicle) {
3.                 super.onCreate(icicle);
4.  
5.                 /* Create a new HTTP-RequestQueue. */
6.                 android.net.http.RequestQueue rQueue = new RequestQueue(this);
7.                
8.                 /* Prepare the Post-Text we are going to send. */
9.                 String POSTText = null;
10.                 try {
11.                         POSTText = "mydata=" + URLEncoder.encode("HELLO, ANDROID HTTPPostExample - by anddev.org", "UTF-8");
12.                 } catch (UnsupportedEncodingException e) {
13.                         return;
14.                 }
15.                 /* And put the encoded bytes into an BAIS,
16.                  * where a function later can READ bytes from. */
17.                 byte[] POSTbytes = POSTText.getBytes();
18.                 ByteArrayInputStream baos = new ByteArrayInputStream(POSTbytes);

Parsed in 0.031 seconds, using GeSHi 1.0.8.4

2.) Preparation is done now, now we will do the interesting stuff:

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1.                 /* Create a header-hashmap */
2.                 Map<String, String> headers = new HashMap<String, String>();
3.                 /* and put the Default-Encoding for html-forms to it. */
4.                 headers.put("Content-Type", "application/x-www-form-urlencoded");
5.                
6.                 /* Create a new EventHandler defined above, to handle what gets returned. */
7.                 MyEventHandler myEvH = new MyEventHandler(this);

Parsed in 0.032 seconds, using GeSHi 1.0.8.4

:idea: MyEventHandler is described in step 5.)

3.) I prepared a very simple php-file on my server, which will simply echo the 'mydata' variable posted to it:

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1.                  <?php
2.                                 echo "POSTed data: '".$_POST['mydata']."'";
3.                  ?>

Parsed in 0.061 seconds, using GeSHi 1.0.8.4

4.) So we will call the queueRequest of our RequestQueue with the following parameters:

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1. "http://www.anddev.org/postresponse.php",  // The location of the php-file
2. "POST", // The Request-'Mode'
3. headers, // The Header which tells we will have some POST-vars
4. myEvH, // our eventhandler
5. baos, // our POST-String(converted to bytes) and ready to be sent
6. POSTbytes.length, // amount of the bytes in 'baos' to be sent
7. false // dunno <img src="http://www.anddev.org/images/smilies/hmm.png" alt=":?" title="Confused" />

Parsed in 0.036 seconds, using GeSHi 1.0.8.4

So as a real implementated call it looks like this:

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1.                 /* Calls a php-file I prepared. It looks like:
2.                  * <?php
3.                  *              echo "POSTed data: '".$_POST['data']."'";
4.                  * ?>*/
5.                 rQueue.queueRequest("http://www.anddev.org/postresponse.php", "POST",
6.                                 headers, myEvH, baos, POSTbytes.length,false);
7.  
8.                 /* Wait until the request is complete.*/
9.                 rQueue.waitUntilComplete();
10.         }

Parsed in 0.036 seconds, using GeSHi 1.0.8.4

5.) The last thing we have is a small nearly dummy-class, the MyEventHandler, which simple reacts on events that occur during the "answer" of the requested url called. There basically are just two functions that actually do something:

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1.                 public void data(byte[] bytes, int len) {
2.                         baf.append(bytes, 0, len); // Add received data to a buffer }
3.  
4.                 public void endData() {
5.                         String text = new String(baf.toByteArray()); // Conert Buffer to String
6.                         myShowNotificationAndLog("Data loaded: n" + text); // Log what was returned }

Parsed in 0.036 seconds, using GeSHi 1.0.8.4

Thats it

The Full Source:

"/src/your_package_structure/HTTPPostExample.java"

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Using java Syntax Highlighting

1. package org.anddev.android.webstuff;
2.  
3. import java.io.ByteArrayInputStream;
4. import java.io.UnsupportedEncodingException;
5. import java.net.URLEncoder;
6. import java.util.HashMap;
7. import java.util.Iterator;
8. import java.util.Map;
9.  
10. import org.apache.http.util.ByteArrayBuffer;
11.  
12. import android.app.Activity;
13. import android.app.NotificationManager;
14. import android.net.http.EventHandler;
15. import android.net.http.Headers;
16. import android.net.http.RequestQueue;
17. import android.net.http.SslCertificate;
18. import android.os.Bundle;
19. import android.util.Log;
20.  
21. public class HTTPPostExample extends Activity {
22.  
23.         // ===========================================================
24.         // Fields
25.         // ===========================================================
26.        
27.         private final String DEBUG_TAG = "httpPostExample";
28.  
29.         // ===========================================================
30.         // 'Constructors'
31.         // ===========================================================
32.  
33.         @Override
34.         public void onCreate(Bundle icicle) {
35.                 super.onCreate(icicle);
36.  
37.                 /* Create a new HTTP-RequestQueue. */
38.                 android.net.http.RequestQueue rQueue = new RequestQueue(this);
39.                
40.                 /* Prepare the Post-Text we are going to send. */
41.                 String POSTText = null;
42.                 try {
43.                         POSTText = "mydata=" + URLEncoder.encode("HELLO, ANDROID HTTPPostExample - by anddev.org", "UTF-8");
44.                 } catch (UnsupportedEncodingException e) {
45.                         return;
46.                 }
47.                 /* And put the encoded bytes into an BAIS,
48.                  * where a function later can read bytes from. */
49.                 byte[] POSTbytes = POSTText.getBytes();
50.                 ByteArrayInputStream baos = new ByteArrayInputStream(POSTbytes);
51.                
52.                 /* Create a header-hashmap */
53.                 Map<String, String> headers = new HashMap<String, String>();
54.                 /* and put the Default-Encoding for html-forms to it. */
55.                 headers.put("Content-Type", "application/x-www-form-urlencoded");
56.                
57.                 /* Create a new EventHandler defined above, to handle what gets returned. */
58.                 MyEventHandler myEvH = new MyEventHandler(this);
59.  
60.                 /* Now we call a php-file I prepared. It is exactly this:
61.                  * <?php
62.                  *              echo "POSTed data: '".$_POST['data']."'";
63.                  * ?>*/
64.                 rQueue.queueRequest("http://www.anddev.org/postresponse.php", "POST",
65.                                 headers, myEvH, baos, POSTbytes.length,false);
66.  
67.                 /* Wait until the request is complete.*/
68.                 rQueue.waitUntilComplete();
69.         }
70.        
71.         // ===========================================================
72.         // Worker Class
73.         // ===========================================================
74.        
75.         private class MyEventHandler implements EventHandler {
76.                 private static final int RANDOM_ID = 0x1337;
77.  
78.                 /** Will hold the data returned by the URLCall. */
79.                 ByteArrayBuffer baf = new ByteArrayBuffer(20);
80.                
81.                 /** Needed, as we want to show the results as Notifications. */
82.                 private Activity myActivity;
83.  
84.                 MyEventHandler(Activity activity) {
85.                         this.myActivity = activity;  }
86.  
87.                 public void data(byte[] bytes, int len) {
88.                         baf.append(bytes, 0, len);  }
89.  
90.                 public void endData() {
91.                         String text = new String(baf.toByteArray());
92.                         myShowNotificationAndLog("Data loaded: n" + text);  }
93.  
94.                 public void status(int arg0, int arg1, int arg2, String s) {
95.                         myShowNotificationAndLog("status [" + s + "]");  }
96.  
97.                 public void error(int i, String s) {
98.                         this.myShowNotificationAndLog("error [" + s + "]");  }
99.  
100.                 public void handleSslErrorRequest(int arg0, String arg1, SslCertificate arg2) { }
101.                 public void headers(Iterator arg0) { }
102.                 public void headers(Headers arg0) { }
103.  
104.                 private void myShowNotificationAndLog(String msg) {
105.                         /* Print msg to LogCat and show Notification. */
106.                         Log.d(DEBUG_TAG, msg);
107.                         NotificationManager nm = (NotificationManager) this.myActivity
108.                                         .getSystemService(Activity.NOTIFICATION_SERVICE);
109.                         nm.notifyWithText(RANDOM_ID, msg, NotificationManager.LENGTH_LONG, null);
110.                 }
111.         }
112. }

Parsed in 0.051 seconds, using GeSHi 1.0.8.4

Regards,
plusminus

dj_4war wrote:Could u pls tell me where can i find android.net.http.RequestQueue api...i am getting error...while creating requestQueue..Like the android.net.http.RequestQueue was not found...also for Header and Iterrator in worker class

also giving error @ Iterator and header class...

also provide code... for geting the response from servlet...instead of PHP...

this could be a really help fr me...

U can see the link follow:

Code: Select all

http://android.git.kernel.org/?p=platform/frameworks/base.git;a=tree;f=core/java/android/net/http

I need some help. I have a toggle button on/off, all I want it to do is read on or off on my localhost webpage. I did the internet permission in the manifest and created the button in main.xml, here is my java code, all I want is the webpage to simply read On or Off depending on the button push. I'm begging for help, I read through this forum and tried everything and nothing worked, hence the unused imports... Please help!!!!

Great tutorial! I'm a newbee so please bare with me, I'm wondering how would one be able to create a custom ListView with images and strings using this method? Do you have an example of something like that?

Thanks. It helped me lot.

songotho wrote:

dj_4war wrote:Could u pls tell me where can i find android.net.http.RequestQueue api...i am getting error...while creating requestQueue..Like the android.net.http.RequestQueue was not found...also for Header and Iterrator in worker class

also giving error @ Iterator and header class...

also provide code... for geting the response from servlet...instead of PHP...

this could be a really help fr me...

U can see the link follow:

Code: Select all

http://android.git.kernel.org/?p=platform/frameworks/base.git;a=tree;f=core/java/android/net/http

i've got same problem
i can't get solution at the link. can someone help me ?