FindViewById (int) method - undefined for Get Data Fragment type for accelerometer sensor

I am doing my project to get data using accelerometer sensor on android platform. I have error codes in the last 3 lines. It is the findViewById error not to get the chunk of data. so how can I use findviewbyId in Fragment to get data accelerometer sensor? Thank you very much for your answer:)

import android.app.Activity;
import android.app.Fragment;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.TextureView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorManager;
import android.hardware.SensorEventListener;


public class GetDataFragment extends Fragment implements SensorEventListener {

//definisi variabel-variabel
//Sensor accelerometer;
private Activity parent;
TextView koordinatX;
TextView koordinatY;
TextView koordinatZ;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    return inflater.inflate(R.layout.get_data, container, false);
}

private SensorManager sensorManager;
private Sensor sensor;
//TextView koordinatX;


    @Override
public void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);

     parent = getActivity();


    sensorManager = (SensorManager) parent.getSystemService(Context.SENSOR_SERVICE);
    sensor = sensorManager.getSensorList(Sensor.TYPE_ACCELEROMETER).get(0);


    koordinatX = (TextView)findViewById(R.id.coordinatx);
    koordinatY = (TextView)findViewById(R.id.coordinaty);
    koordinatZ = (TextView)findViewById(R.id.coordinatz);


}