i am doing given below but it is giving exception unable to instantiate activity

> 
> java.lang.InstantiationException
> 
> 
> 

below is my code>

```
 public class GetDeviceIdActivity extends Activity{

Context myContext;
public GetDeviceIdActivity(Context myContext)
{
    this.myContext = myContext;

}

TelephonyManager telephonyManager = (TelephonyManager)myContext.getSystemService(Context.TELEPHONY_SERVICE);
String imei = telephonyManager.getDeviceId();

```