Detect Android Accelerometer sensor changed

package com.exercise.AndroidAccelerometer;

import java.util.List;

import android.app.Activity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.widget.TextView;

public class AndroidAccelerometer extends Activity {

SensorManager sensorManager;
boolean accelerometerPresent;
Sensor accelerometerSensor;

TextView x, y, z;

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
      x = (TextView)findViewById(R.id.x);
      y = (TextView)findViewById(R.id.y);
      z = (TextView)findViewById(R.id.z);
    
      sensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
      List<Sensor> sensorList = sensorManager.getSensorList(Sensor.TYPE_ACCELEROMETER);
      if(sensorList.size() > 0){
       accelerometerPresent = true;
       accelerometerSensor = sensorList.get(0);
      }
      else{
       accelerometerPresent = false;
      }
  }

@Override
protected void onResume() {
 // TODO Auto-generated method stub
 super.onResume();
 if(accelerometerPresent){
  sensorManager.registerListener(accelerometerListener, accelerometerSensor, SensorManager.SENSOR_DELAY_NORMAL);
 }
}

@Override
protected void onStop() {
 // TODO Auto-generated method stub
 super.onStop();
 if(accelerometerPresent){
  sensorManager.unregisterListener(accelerometerListener);
 }
}

private SensorEventListener accelerometerListener = new SensorEventListener(){

 @Override
 public void onAccuracyChanged(Sensor arg0, int arg1) {
  // TODO Auto-generated method stub
 
 }

 @Override
 public void onSensorChanged(SensorEvent arg0) {
  // TODO Auto-generated method stub
  float x_value = arg0.values[0];
  float y_value = arg0.values[1];
  float z_value = arg0.values[2];
  x.setText(String.valueOf(x_value));
  y.setText(String.valueOf(y_value));
  z.setText(String.valueOf(z_value));
 }};
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  >
<TextView
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="@string/hello"
  />
<TextView
android:id="@+id/x"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/y"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/z"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>

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next:
- Detect Shaking
- Detect phone flipping