android - How to detect connection type

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="#cedfde"     >     <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="Get Active Network Type"         android:layout_below="@id/tv"         /> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcodesnippets;  import android.app.ActionBar; import android.content.Context; import android.graphics.Color; import android.graphics.drawable.ColorDrawable; import android.net.NetworkInfo; 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 android.net.ConnectivityManager;   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         simpulan RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);         simpulan Button btn = (Button) findViewById(R.id.btn);         simpulan TextView tv = (TextView) findViewById(R.id.tv);          simpulan ActionBar ab = getActionBar();         ab.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#FF99C5FF")));          btn.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 String type = getConnectionType();                 if(type!= null){                     tv.setText("Active network type : " + type );                 }                 else {                     tv.setText("No active network found.");                 }            }         });     }      // Custom method to detect active network connection type     public String getConnectionType(){         String type = null;         /*             ConnectivityManager                 Class that answers queries about the state of network connectivity. It also                 notifies applications when network connectivity changes. Get an instance of this                 class by calling Context.getSystemService(Context.CONNECTIVITY_SERVICE).         */         ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);          /*             NetworkInfo                 Describes the status of a network interface.                  Use getActiveNetworkInfo() to get an instance that represents the                 current network connection.         */         NetworkInfo activeNetwork = cm.getActiveNetworkInfo();          // Determine if there is any active network         boolean isConnected = activeNetwork != null && activeNetwork.isConnectedOrConnecting();          if(isConnected) // If there is an active network         {             /*                 public String getTypeName ()                     Return a human-readable name describe the type of the network,                      for example "WIFI" or "MOBILE".                  Returns                     the name of the network type             */              /*                 You can get active network type instead type name by using the following method.                 But you need to make the necessary changes on this code.             */              /*                 public int getType ()                     Reports the type of network to which the gosip in this NetworkInfo pertains.                  Returns                     one of TYPE_MOBILE, TYPE_WIFI, TYPE_WIMAX, TYPE_ETHERNET, TYPE_BLUETOOTH,                     or other types defined by ConnectivityManager             */             type = activeNetwork.getTypeName();         }         return type;     } }
AndroidManifest.xml (permission) 
 <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
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