Http Post connection in SDK-1.0

Nemat · by **Nemat** » Mon Sep 29, 2008 9:56 am

Hi,
I am using Android SDK-1.0.I was able to make Http post connection with server in SDK-0.9.How can this be done using new SDK?

Thanks in advance

ninor · by **ninor** » Mon Sep 29, 2008 10:25 am

This Http thing has changed a little bit.
Here's the new location of the library (and possibly there are some internal changes):
http://code.google.com/android/reference/org/apache/http/impl/package-summary.html

Nemat · by **Nemat** » Mon Sep 29, 2008 11:39 am

Thanks ninor for your reply.

But I got error in implementing EventHandler interface and android.net.http.RequestQueue class.

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Using java Syntax Highlighting

public void go(Map<String,String> variables){
 
       MyEventHandler myEvH = new MyEventHandler(this);
 
        android.net.http.RequestQueue rQueue = new RequestQueue(this);        
 
        Map<String, String> headers = new HashMap<String, String>();
 
        headers.put("Content-Type", "application/x-www-form-urlencoded");
 
               String variablesURL;
 
        if(variables != null && variables.size() > 0){
 
             try {
 
                  StringBuilder b = new StringBuilder();
 
                  Set<String> keys = variables.keySet();
 
                  // Iterate over each variable you want and append it to our variablesURL variable
 
                  for(Iterator<String> i = keys.iterator();;){
 
                       String key = i.next();
 
                       b.append(key);
 
                       b.append("=");
 
                       b.append(URLEncoder.encode(variables.get(key), "UTF-8"));
 
                       // Minor speed optimization so that i.hasNext() is only called once (instead of in the for loop).
 
                       if(i.hasNext()){
 
                            b.append("&");
 
                       } else {
 
                            break;
 
                       }
 
                  }
 
                  variablesURL = b.toString();
 
             } catch (UnsupportedEncodingException e) {
 
                  Log.e("HTTP_Request", "Unsupported Encoding Exception");
 
                  return;
 
             }
 
        } else {
 
             variablesURL = "";
 
        }
 
             byte[] POSTbytes = variablesURL.getBytes();
 
             ByteArrayInputStream baos = new ByteArrayInputStream(POSTbytes);
 
             rQueue.queueRequest("http://www.zinsure.net/zinsure/JSONServlet", "POST", headers, myEvH, baos, POSTbytes.length, false);               
 
   }
 
private class MyEventHandler implements EventHandler {
 
        private static final int RANDOM_ID = 0x1337;
 
        private  String DEBUG_TAG = null;
 
        ByteArrayBuffer baf = new ByteArrayBuffer(20);
 
        private Activity myActivity;
 
        MyEventHandler(Activity activity) {
 
             this.myActivity = activity;  
 
        }
 
        public void data(byte[] bytes, int len) {
 
             baf.append(bytes, 0, len);  }
 
        public void endData() {
 
             String text = new String(baf.toByteArray());
 
             myShowNotificationAndLog("Data loaded: \n" + text);
 
                        } catch (JSONException e) {
 
                                // TODO Auto-generated catch block
 
                                e.printStackTrace();
 
                        }
 
        }
 
        public void status(int arg0, int arg1, int arg2, String s) {
 
             myShowNotificationAndLog("status [" + s + "]");  }
 
        public void error(int i, String s) {
 
             this.myShowNotificationAndLog("error [" + s + "]");  }
 
        public void handleSslErrorRequest(int arg0, String arg1, SslCertificate arg2) { }
 
        public void headers(Iterator arg0) { }
 
        public void headers(Headers arg0) { }
 
        private void myShowNotificationAndLog(String msg) {
 
             Log.d(DEBUG_TAG, msg);
 
       }
 
                public void certificate(SslCertificate arg0) {
 
                        // TODO Auto-generated method stub
 
                }
 
                public void handleSslErrorRequest(SslError arg0) {
 
                        // TODO Auto-generated method stub
 
                }
 
    }
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ninor · by **ninor** » Mon Sep 29, 2008 11:58 am

I made a new app with your code, but I can't find RequestQueue.
android.net.http.RequestQueue
What imports are you using in this activity/service?

You said you were with SDK 1.0, wasn't it? Maybe your preferences aren't correctly mapped to the 1.0 directory.
Have you checked the directory specified in Eclipse -> Window -> Preferences -> Android?

ninor · by **ninor** » Mon Sep 29, 2008 12:26 pm

Apart from these checks, you can see this example:

An example that demonstrates how HttpClient APIs can be used to perform form-based logon.

http://svn.apache.org/repos/asf/httpcom ... Login.java

Nemat · by **Nemat** » Mon Sep 29, 2008 1:34 pm

Thanks for your reply....
This code is working well in SDK-0.9 .I have to convert it into SDK-1.0.But I got errors in request queue and eventHandler class because these classes are removed from new SDK.I dont know which new classes are added instead of them.
Please give me any example of Http post for SDK-1.0.....

Thanks in Advance

ninor · by **ninor** » Mon Sep 29, 2008 3:49 pm

Here it is, directly ripped from the example I posted earlier.
The test page is simpler (thanks www.PragProg.com) with only an email and a password fields.
Also, I commented the code a bit, to set it clear.
Now, this must go inside a Thread to be really useful. You'll note some delay between starting the activity and showing the text. This is probably due to https connection setup.

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Using java Syntax Highlighting

package org.testing.httpPostTest;
 
import android.app.Activity;
 
import android.os.Bundle;
 
import android.util.Log;
 
import android.widget.TextView;
 
import java.io.IOException;
 
import java.util.ArrayList;
 
import java.util.List;
 
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.cookie.Cookie;
 
import org.apache.http.impl.client.DefaultHttpClient;
 
import org.apache.http.message.BasicNameValuePair;
 
import org.apache.http.protocol.HTTP;
 
public class httpPostTest extends Activity {
 
        TextView textMsg;         
 
          /** Called with the activity is first created. */
 
          @Override
 
          public void onCreate(Bundle icicle) {
 
            super.onCreate(icicle);
 
            setContentView(R.layout.httplayout);
 
            // Associate component with layout
 
            textMsg=(TextView)findViewById(R.id.httptext);
 
            DefaultHttpClient httpclient = new DefaultHttpClient();     
 
            // Get cookies from the login page (not the address same of the form post)
 
                HttpGet httpget = new HttpGet("https://secure.pragprog.com/login");
 
                HttpResponse response;
 
                try {
 
                        response = httpclient.execute(httpget);
 
                    HttpEntity entity = response.getEntity();
 
                        Log.d("httpPost", "Login form get: " + response.getStatusLine());
 
                        if (entity != null) {
 
                            entity.consumeContent();
 
                        }
 
                        Log.d("httpPost", "Initial set of cookies:");
 
                        List<Cookie> cookies = httpclient.getCookieStore().getCookies();
 
                        if (cookies.isEmpty()) {
 
                                Log.d("httpPost", "None");
 
                        } else {
 
                            for (int i = 0; i < cookies.size(); i++) {
 
                                Log.d("httpPost", "- " + cookies.get(i).toString());
 
                            }
 
                        }
 
                        // Preparing the post operation (address obtained from the Login page source; it's the form-action)
 
                        HttpPost httpost = new HttpPost("https://secure.pragprog.com/session?");
 
                        List <NameValuePair> nvps = new ArrayList <NameValuePair>();
 
                        nvps.add(new BasicNameValuePair("email", "youremail@email.org"));
 
                        nvps.add(new BasicNameValuePair("password", "somepassword"));
 
                        httpost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));
 
                        // Post, check and show the result (not really spectacular, but works):
 
                        response = httpclient.execute(httpost);
 
                        entity = response.getEntity();
 
                        Log.d("httpPost", "Login form get: " + response.getStatusLine());
 
                        textMsg.setText("Response: " + response.getStatusLine());
 
                        if (entity != null) {
 
                            entity.consumeContent();
 
                        }
 
                        // Send the cookies grabbed from the login form
 
                        Log.d("httpPost", "Post logon cookies:");
 
                        cookies = httpclient.getCookieStore().getCookies();
 
                        if (cookies.isEmpty()) {
 
                                Log.d("httpPost", "None");
 
                        } else {
 
                            for (int i = 0; i < cookies.size(); i++) {
 
                                Log.d("httpPost", "- " + cookies.get(i).toString());
 
                            }
 
                        }                 
 
                } catch (ClientProtocolException e) {
 
                        Log.e("httpPost", e.getMessage());
 
                        e.printStackTrace();
 
                } catch (IOException e) {
 
                        Log.e("httpPost", e.getMessage());
 
                        e.printStackTrace();
 
                } catch (Exception e) {
 
                        Log.e("httpPost", e.getMessage());
 
                        e.printStackTrace();
 
                }
 
        }
 
}
 
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And the layout (it's really complex!)

Filename: httplayout.xml

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Using xml Syntax Highlighting

<?xml version="1.0" encoding="utf-8"?>
 
<LinearLayout
 
  xmlns:android="http://schemas.android.com/apk/res/android"
 
  android:orientation="vertical"
 
  android:layout_width="wrap_content" 
 
  android:layout_height="wrap_content" 
 
  android:layout_gravity="center_vertical|center_horizontal">
 
  <TextView
 
    android:layout_width="wrap_content"
 
    android:layout_height="wrap_content"
 
    android:text="Hola nenk" android:id="@+id/httptext"/>
 
</LinearLayout>
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Hope this helps.

edit: Beautified the code with Syntax tags

Nemat · by **Nemat** » Tue Sep 30, 2008 1:28 pm

Thanks ninor......

now my code is working well....

Thanks a lot....

ElBerto · by **ElBerto** » Wed Oct 01, 2008 2:47 am

ninor,
I am having trouble implementing the example you posted above. When I change the address to google, I get a failure message. I just changed the urls to 'https://www.google.com' which should work fine, but I get a 'The target server failed to respond' error message. Any thoughts?

Thanks

ninor · by **ninor** » Wed Oct 01, 2008 8:01 am

What login/service do you want to enter in?
Maybe there's no necessity for the HTTPS, so you can use HTTP.

ElBerto · by **ElBerto** » Wed Oct 01, 2008 2:36 pm

Ninor,
Thanks for the reply. About 2 hours after posting this I stumbled across something weird. I have setup the development environment in Ubuntu. When I execute the Android application from within Eclipse and it transfers the program over to the emulator, the HTTPClient to https://www.google.com will fail. But when I reboot the emulator and launch it manually (or cause the system to crash and reboot by killing one of the root processes), it works fine. That is will work until I need to recompile and transfer the application from Eclipse. I was watching the SSL communication in Wireshark and it seems to be failing during the handshaking. I wonder if the Eclipse Plug-in is corrupting the certificate for google in some way.

Anyway, I am going to setup a Windows Environment this weekend and see if I see the same issue.

Again, Thanks for your help.

ninor · by **ninor** » Wed Oct 01, 2008 4:30 pm

Well, it seems that the SDK 1.0r1 should still be called a BETA version...

·

phannguyen · by **phannguyen** » Thu Oct 02, 2008 11:18 am

hi ninor,
i have edit your httpPostTest to call a webservice . When debug, i got error at

Code: Select all: response = httpclient.execute(httpget);

I use httpClient to call a webservice, it's right?

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....
 
 DefaultHttpClient httpclient = new DefaultHttpClient(); 
 
         // Get cookies from the login page (not the address same of the form post)
 
          HttpGet httpget = new HttpGet("http://webservice.asmx");//webservice address is availabel
 
          HttpResponse response;
 
          try {
 
               response = httpclient.execute(httpget);// throw exception at here
 
              HttpEntity entity = response.getEntity(); 
 
....
 
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How i can call webservice ?
Android sdk 1.0 have many lib relate http (org.apache.http,org.apache.http.client,...) so i can't understand how to use it and what it mean.
Can u show me step by step to call webservice on android?

thanks a lot.

ninor · by **ninor** » Thu Oct 02, 2008 12:12 pm

I'm not sure if this code will allow connecting to a web service.
But if the web service in question is very simple, then: Can you send me via Private Msg the address of the webservice to check it?

phannguyen · by **phannguyen** » Fri Oct 03, 2008 3:23 am

hi ninor,
This is webservice address http://webservices.iter.dk/calculator.asmx
I pick up it from http://www.anddev.org/viewtopic.php?p=8837
But i don't want to use ksoap2 library, because there are many classes i can't convert to SDK 1.0 as u know in http://www.anddev.org/plshelp_me_conver ... t3005.html
So is there a simpler way to call a webservice that only use android sdk not another lib?
thanks for help.

Http Post connection in SDK-1.0

Http Post connection in SDK-1.0

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