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Here is source code of the Program to Open an Internet Data Stream in Android. The program is successfully compiled and run on a Windows system using Eclipse Ide. The program output is also shown below.

Before you can access Internet resources, you need to add an INTERNET uses-permission node to
your application manifest, as shown in the following XML snippet:

<uses-permission android:name=”android.permission.INTERNET”/>

The following shows the basic pattern for opening an Internet data stream

String myFeed = getString(R.string.my_feed);
try {
    URL url = new URL(myFeed);
    // Create a new HTTP URL connection
    URLConnection connection = url.openConnection();
    HttpURLConnection httpConnection = (HttpURLConnection)connection;
    int responseCode = httpConnection.getResponseCode();
    if (responseCode == HttpURLConnection.HTTP_OK) {
        InputStream in = httpConnection.getInputStream();
        processStream(in);
     }
}
catch (MalformedURLException e) {
    Log.d(TAG, “Malformed URL Exception.”);
}
catch (IOException e) {
    Log.d(TAG, “IO Exception.”);
}

Here is the code to download a picture from internet following the url that is provided and displaying it on an Image view using an HTTP client.

Main Activity

 
package com.example.internet_stream;
 
import java.io.IOException;
 
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
 
 
import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
 
public class MainActivity extends Activity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final Button but = (Button)findViewById(R.id.button);
 
    }
 
    public void downloadPicture(View view) {
        final ProgressDialog dialog = ProgressDialog.show(this, "Download",
                "downloading");
        dialog.show();
 
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    final Bitmap downloadedBitmap = downloadBitmap("http://www.sanfoundry.com/wp-content/uploads/2013/04/san-ecosystem_new.png");
                    final ImageView imageView = (ImageView) findViewById(R.id.imageView1);
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            imageView.setImageBitmap(downloadedBitmap);
                        }
                    });
 
                } catch (IOException e) {
                    e.printStackTrace();
                } finally {
                    dialog.dismiss();
                }
            }
        }).start();
 
    }
 
    private Bitmap downloadBitmap(String url) throws IOException {
        //Create a new HTTP url connection
        HttpUriRequest request = new HttpGet(url.toString());
        HttpClient httpClient = new DefaultHttpClient();
        //get the rsponse
        HttpResponse response = httpClient.execute(request);
        //check for the status
        StatusLine statusLine = response.getStatusLine();
        int responseCode = statusLine.getStatusCode();
        //check for the response code
        if (responseCode == 200) {
            HttpEntity entity = response.getEntity();
            byte[] bytes = EntityUtils.toByteArray(entity);
 
            Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0,
                    bytes.length);
            return bitmap;
        } else {
            throw new IOException("Download failed, HTTP response code "
                    + responseCode + " - " + statusLine.getReasonPhrase());
        }
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
 
}

ActivityMain.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >
 
           <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="downloadPicture"
            android:text="Click to download" 
            android:id="@+id/button"/>
 
        <ImageView
            android:id="@+id/imageView1"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:src="@drawable/ic_launcher" >
        </ImageView>
 
</RelativeLayout>

Java Android Program to Open an Internet Data Stream