Httclient

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URI;
import java.net.URISyntaxException;
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.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.HTTP;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class Main extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        findViewById(R.id.btnGetURL).setOnClickListener(
				new Button.OnClickListener() {
					@Override
					public void onClick(View v) {
						((TextView) findViewById(R.id.txtResultat)).setText(
								 GetHTML(((EditText)findViewById(R.id.txtURL)).getText().toString(), null));
						
					}
				}
		);
        
    }
    
  //=======================================================
	// Recupère une page Web
	//=======================================================
	public String GetHTML(String url, List <NameValuePair> nvps) {
		DefaultHttpClient httpClient = new DefaultHttpClient();
		try {
			HttpResponse res;
			URI uri = new URI(url);
	    	if (nvps!=null){
	    		HttpPost methodpost = new HttpPost(uri);
	    		methodpost.addHeader("pragma","no-cache");
	    		methodpost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));
	    		res = httpClient.execute(methodpost);
		    } else {
	    		HttpGet methodget = new HttpGet(uri);
		    	methodget.addHeader("pragma","no-cache");
		    	res = httpClient.execute(methodget);
		    }
	    	InputStream data = res.getEntity().getContent();
	    	
	    	return generateString(data);
	    		    	        	
		} catch (URISyntaxException e) {
			e.printStackTrace();
		} catch (ClientProtocolException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return "";
	}
	
	//=======================================================
	// GenerateString 
	//=======================================================
	static public String generateString(InputStream stream) {
		InputStreamReader reader = new InputStreamReader(stream);
		BufferedReader buffer = new BufferedReader(reader);
		StringBuilder sb = new StringBuilder();
		try { 
			String cur;   
			while ((cur = buffer.readLine()) != null) {   
				sb.append(cur).append("\n");  
			}  
		} catch (IOException e) {  
			e.printStackTrace();  
		}
		try {
			stream.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return sb.toString(); 
	}
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<EditText android:layout_height="wrap_content" android:layout_width="fill_parent" android:text="http://www.codes-sources.com/" android:id="@+id/txtURL"></EditText>
<Button android:layout_height="wrap_content" android:layout_width="fill_parent" android:text="Télécharger la page" android:id="@+id/btnGetURL"></Button>
<TextView android:text="TextView01" android:id="@+id/txtResultat" android:layout_height="fill_parent" android:layout_width="fill_parent"></TextView>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.formation.gethttp"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".Main"
                  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>
    <uses-sdk android:minSdkVersion="3" />
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
</manifest>