LocationManager locationManager=(LocationManager) this.getSystemService(Context.LOCATION_SERVICE);

public class SMSReceiver extends BroadcastReceiver {

  private String message;


@Override
public void onReceive(Context context, Intent intent) {
Bundle bundle = intent.getExtras();

SmsMessage[] msgs = null;
if (bundle != null) {
Object[] pdus = (Object[]) bundle.get("pdus");
msgs = new SmsMessage[pdus.length];
if (msgs.length >= 0) {
msgs[0] = SmsMessage.createFromPdu((byte[]) pdus[0]);
message = msgs[0].getMessageBody().toString();


//if it's the locating command
if(message.equals("find location xyz"))
{
    PhoneLocater pl = new PhoneLocater();
    pl.locatePhone();
}


else
{Toast.makeText(context,"Nothing",Toast.LENGTH_LONG ).show();
}


}
}
}
}

<receiver android:name="com.example.find_me.SMSReceiver">
<intent-filter>
    <action android:name="android.provider.Telephony.SMS_RECEIVED" />
</intent-filter>

@Override
public void onReceive(Context context, Intent intent) {
    LocationManager locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
    // whatever you need to do
}