Android Sensor

package com.example.testsensors;

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;
import android.widget.Toast;

public class TestSensors extends Activity implements SensorEventListener {
    private boolean theRegisteredSensor;
    private SensorManager theSensorManager;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        theRegisteredSensor = false;
        theSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
    }
        protected void onStart() {
                super.onResume();
                List<sensor> sensors = theSensorManager
                .getSensorList(Sensor.TYPE_ACCELEROMETER);
                if (sensors.size() > 0) {
                        Sensor sensor = sensors.get(0);
                        theRegisteredSensor = theSensorManager.registerListener(this, sensor, SensorManager.SENSOR_DELAY_FASTEST);
                }
        }



        @Override
        protected void onPause() {
                if (theRegisteredSensor) {
                        theSensorManager.unregisterListener(this);
                        theRegisteredSensor = false;
                }
                super.onPause();
        }


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

        @Override
        public void onSensorChanged(SensorEvent event) {
            // TODO Auto-generated method stub
            StringBuffer StringBuff = new StringBuffer();
            if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER){
                StringBuff.append("Accelerometer\n");
                StringBuff.append("X-axis:").append(event.values[0]).append("\n");
                StringBuff.append("Y-axis:").append(event.values[1]).append("\n");
                TextView tv = (TextView) findViewById(R.id.accero_counters);
                tv.setText(StringBuff.toString());
            Toast.makeText(getBaseContext()
            , "Movement is detected.",Toast.LENGTH_SHORT).show();
        }
   }
}
</sensor>