Using Asynchronous task in Android

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<?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"     >   <Button     android:layout_height="wrap_content"     android:layout_width="fill_parent"     android:id="@+id/readWebpage"     android:onClick="readWebpage"     android:text="Load Webpage"> </Button> <TextView     android:id="@+id/TextView01"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:text="Asynchronous task Demo from CoderzHeaven"> </TextView> </LinearLayout>

Here is the AndroidManifest.xml file
Make sure to add the android.permission.INTERNET permission in this file.

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

The main java file

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package com.pack.coderzheaven;   import java.io.BufferedReader; import java.io.InputStream; import java.io.InputStreamReader;   import org.apache.http.HttpResponse; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient;   import android.app.Activity; import android.os.AsyncTask; import android.os.Bundle; import android.view.View; import android.widget.TextView; import android.widget.Toast;   public class AsynsTaskExample extends Activity {     private TextView textView;     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);         textView = (TextView) findViewById(R.id.TextView01);     }       private class DownloadWebPageTask extends AsyncTask<String, Void, String> {         @Override         protected String doInBackground(String... urls) {             String response = "";             for (String url : urls) {                 DefaultHttpClient client = new DefaultHttpClient();                 HttpGet httpGet = new HttpGet(url);                 try {                     HttpResponse execute = client.execute(httpGet);                     InputStream content = execute.getEntity().getContent();                       BufferedReader buffer = new BufferedReader(                             new InputStreamReader(content));                     String s = "";                     while ((s = buffer.readLine()) != null) {                         response += s;                     }                   } catch (Exception e) {                     Toast.makeText(getApplicationContext(),"Some Error Occurred! " + e.getMessage(), Toast.LENGTH_LONG).show();                 }             }             return response;         }           @Override         protected void onPostExecute(String result) {             textView.setText(result);             Toast.makeText(getApplicationContext(),"Loading WebPage Complete", Toast.LENGTH_LONG).show();         }     }       public void readWebpage(View view) {         DownloadWebPageTask task = new DownloadWebPageTask();         task.execute(new String[] { "http://www.google.com" });       } }