Getting Data From the Web (URLConnection via http)

Klian · by **Klian** » Wed Feb 25, 2009 12:21 pm

Ive tried the example code and all I get is (see attached image)

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package org.klian.android.GetDataFromTheWeb;
 
import android.app.Activity;
 
import android.os.Bundle;
 
import java.io.BufferedInputStream; 
 
import java.io.InputStream; 
 
import java.net.URL; 
 
import java.net.URLConnection; 
 
import org.apache.http.util.ByteArrayBuffer; 
 
import android.widget.TextView; 
 
public class GetDataFromTheWeb extends Activity {
 
    /** Called when the activity is first created. */
 
    @Override
 
    public void onCreate(Bundle savedInstanceState) {
 
        /* We will show the data we read in a TextView. */ 
 
        TextView tv = new TextView(this); 
 
        /* Will be filled and displayed later. */ 
 
        String myString = null; 
 
        try { 
 
             /* Define the URL we want to load data from. */ 
 
             URL myURL = new URL( 
 
                       "http://www.tortuganinja.com"); 
 
             /* Open a connection to that URL. */ 
 
             URLConnection ucon = myURL.openConnection(); 
 
             /* Define InputStreams to read 
 
              * from the URLConnection. */ 
 
             InputStream is = ucon.getInputStream(); 
 
             BufferedInputStream bis = new BufferedInputStream(is); 
 
             /* Read bytes to the Buffer until 
 
              * there is nothing more to read(-1). */ 
 
             ByteArrayBuffer baf = new ByteArrayBuffer(50); 
 
             int current = 0; 
 
             while((current = bis.read()) != -1){ 
 
                  baf.append((byte)current); 
 
             } 
 
             /* Convert the Bytes read to a String. */ 
 
             myString = new String(baf.toByteArray()); 
 
        } catch (Exception e) { 
 
             /* On any Error we want to display it. */ 
 
             myString = e.getMessage(); 
 
        } 
 
        /* Show the String on the GUI. */ 
 
        tv.setText(myString); 
 
        this.setContentView(tv); 
 
    }
 
}
 
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kali · by **kali** » Thu Feb 26, 2009 7:31 am

hai friend is it possible to brows gallary from code

alienmanfc6 · by **alienmanfc6** » Fri Feb 27, 2009 7:31 pm

Hello there,
I am using this code as a start to my app that will get info from a html file. What i need to know is, is there a way to adjust the time out on the web page request?
Thanks

metachris · by **metachris** » Tue Mar 03, 2009 9:45 am

Hey!

Some of you might have noticed that fetching data from the web blocks the GUI, even if you do it in a handler.

Here is how to do the same thing non-blocking, using a Thread. Threads on the other side cannot interact with the GUI (not even Toast), so we'll be posting a Handler that can do that:

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public class Iconic extends Activity {
    private String html = "";
    private Handler mHandler;
 
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mHandler = new Handler();
        checkUpdate.start();
    }
 
    private Thread checkUpdate = new Thread() {
        public void run() {
            try {
                URL updateURL = new URL("http://iconic.4feets.com/update");
                URLConnection conn = updateURL.openConnection();
                InputStream is = conn.getInputStream();
                BufferedInputStream bis = new BufferedInputStream(is);
                ByteArrayBuffer baf = new ByteArrayBuffer(50);
 
                int current = 0;
                while((current = bis.read()) != -1){
                    baf.append((byte)current);
                }
 
                /* Convert the Bytes read to a String. */
                html = new String(baf.toByteArray());
                mHandler.post(showUpdate);
            } catch (Exception e) {
            }
        }
    };
 
    private Runnable showUpdate = new Runnable(){
        public void run(){
            Toast.makeText(Iconic.this, "HTML Code: " + html, Toast.LENGTH_SHORT).show();
        }
    };
}
 
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Hope some of you can use this code! This was originally posted on 4feets.com

- Chris

Berzerk · by **Berzerk** » Tue Mar 10, 2009 5:56 am

If anyone is still having problems with character encoding, character set, unicode, etc...

Here is what worked for me:

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myString = EncodingUtils.getString(baf.toByteArray(), "ISO-8859-1");
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That line replaced the original line in the GetDataFromWeb tutorial.

The characterset "ISO-8859-1" works perfect for Portuguese and similar languages. For other languages, look up the appropriate characterset and replace it.

Don't forget to include:

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import org.apache.http.util.EncodingUtils;
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-Berzerk

rahulp · by **rahulp** » Tue Mar 17, 2009 8:03 am

hi.. plusminus
when i tried running ur code..i got an "unknown error

cymon · by **cymon** » Fri Mar 27, 2009 1:21 am

@rahulp

Add this to your manifest file: <uses-permission android:name="android.permission.INTERNET" />

sujay0000 · by **sujay0000** » Thu Apr 16, 2009 5:40 pm

Hello;

Can someone tell me how do we get the same thing working with other file formats and save them in the default location??

like if I wanna download something from

mydomain.com/music/abcd.mp3

so what modification in this code could help us save this abcd.mp3 on the default laction on our phone?

rahulp · by **rahulp** » Fri Apr 24, 2009 10:12 am

hi.. i want to download a file from a server. where i can send the name of the file to download.. how can i send this to my server,, also how to retrieve this filename at the server

glory · by **glory** » Mon Apr 27, 2009 12:02 pm

Hi Plusminus,

When I tried to run your code then I got unknown Error as output

I have also given permission in the Android manifest file

And when I tried to do HTTP Connection then i Got the follwing error

04-27 16:38:59.296: ERROR/OSNetworkSystem(326): unknown socket error -1

Please help me out , I have given the appropiate Permission in the Manifest in the file

myshoes · by **myshoes** » Mon May 04, 2009 2:11 am

Can someone verify whether webview is working with the 1.5 sdk? Not even the sample provided on the google code page works as of today (5/3).

desuvinodkumar · by **desuvinodkumar** » Wed Jun 17, 2009 7:04 am

plusminus wrote:Hello venkat,

perhaps sth like this works:
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// ...

/* Open a connection to that URL. */

URLConnection ucon = myURL.openConnection(new Proxy(...));

// ...

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Regards,
plusminus

HI PLUS MINUS

i need to query the webservices
how can i do it

i need to downnload images for the PHp (nusoap) server how can i do it

desuvinodkumar · by **desuvinodkumar** » Tue Jun 23, 2009 7:51 am

Hi

I need to get data from PHP server and should return that data in Xml format How can i do that

thanks in advance

sedimental · by **sedimental** » Tue Jul 21, 2009 7:50 am

Hi guys, can anyone help me with this error? I have no idea how to solve it!

dapaintballer331 · by **dapaintballer331** » Sat Aug 08, 2009 10:26 pm

read what the screen says.... add that permission to android manifest... wow.

Eclipse can do this, or read the 4-20 posts in this thread, specifying where, what, and how to add the permission.

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