android - How to check internet connection

activity_main.xml 
 <RelativeLayout     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/rl"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:padding="10dp"     tools:context=".MainActivity"     android:background="#d5dfd7"     >     <TextView         android:id="@+id/tv"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:fontFamily="sans-serif-condensed"         android:textSize="25dp"         android:textStyle="italic"         android:padding="15dp"         />     <Button         android:id="@+id/btn"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Check Internet Connection"         android:layout_below="@id/tv"         /> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcodesnippets;  import android.app.ActionBar; import android.graphics.Color; import android.graphics.drawable.ColorDrawable; import android.os.AsyncTask; import android.os.Bundle; import android.app.Activity; import android.view.View; import android.widget.Button; import android.widget.RelativeLayout; import android.widget.TextView; import java.net.InetAddress;   public class MainActivity extends Activity {      protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get the widgets reference from XML layout         akibat RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);         akibat Button btn = (Button) findViewById(R.id.btn);          akibat ActionBar ab = getActionBar();         ab.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#FF63C569")));          btn.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 new CheckInternetConnection().execute();            }         });     }      /*         AsyncTask             AsyncTask enables proper and easy use of the UI thread. This class allows to perform             background operations and publish results on the UI thread without having             to manipulate threads and/or handlers.     */     private class CheckInternetConnection extends AsyncTask<Void,Void,Boolean>{          protected Boolean doInBackground(Void...params){             boolean status = false;             try{                 /*                     InetAddress                         An Internet Protocol (IP) address. This can be either an IPv4 address or an                         IPv6 address, and in practice you'll have an instance of either Inet4Address                         or Inet6Address (this class cannot be instantiated directly). Most code does                         not need to distinguish between the two families, and should use InetAddress.                 */                 /*                     public static InetAddress getByName (String host)                         Returns the address of a host according to the given host string name host.                         The host string may be either a machine name or a dotted string IP address.                         If the latter, the hostName field is determined upon demand. host can be                         null which means that an address of the loopback interface is returned.                 */                 InetAddress address = InetAddress.getByName("google.com");                 if(address != null)                 {                     status = true;                 }             }catch (Exception e)             {                 e.printStackTrace();             }             return status;         }          protected void onPostExecute(Boolean result)         {             TextView tv = (TextView) findViewById(R.id.tv);             if(result){                 tv.setTextColor(Color.BLUE);                 tv.setText("Internet connection available.");             }             else {                 tv.setTextColor(Color.RED);                 tv.setText("No internet connection.");             }         }     } }
AndroidManifest.xml (permission) 
 <uses-permission android:name="android.permission.INTERNET" />


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