How to get IMEI or ESN Programmatically in Android

To Get IMEI or ESN Programmatically in Android

package mn.androidms_imei;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.telephony.TelephonyManager;
import android.widget.TextView;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       
        TextView textDeviceID = (TextView)findViewById(R.id.deviceid);

        //retrieve a reference to an instance of TelephonyManager
        TelephonyManager telephonyManager = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);

        textDeviceID.setText(getDeviceID(telephonyManager));

    }

    String getDeviceID(TelephonyManager phonyManager){

     String id = phonyManager.getDeviceId();
     if (id == null){
      id = "not available";
     }

     int phoneType = phonyManager.getPhoneType();
     switch(phoneType){
     case TelephonyManager.PHONE_TYPE_NONE:
      return "NONE: " + id;

     case TelephonyManager.PHONE_TYPE_GSM:
      return "GSM: IMEI=" + id;

     case TelephonyManager.PHONE_TYPE_CDMA:
      return "CDMA: MEID/ESN=" + id;

     /*
      *  for API Level 11 or above
      *  case TelephonyManager.PHONE_TYPE_SIP:
      *   return "SIP";
      */

     default:
      return "UNKNOWN: ID=" + id;
     }

    }
   
}

//***activity_main.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/deviceid"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView" />

</LinearLayout>

//***Add Permission 

android.permission.READ_PHONE_STATE