Android Adım Sayar Uygulaması Yapımı

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
              android:orientation="vertical" 
              android:gravity="center" 
              android:layout_width="match_parent" 
              android:layout_height="match_parent"> 
    <TextView android:textColor="@android:color/white" 
              android:layout_width="wrap_content" 
              android:layout_height="wrap_content" 
              android:text="Adım sayar çalışıyor:"/> 
    <TextView android:id="@+id/count" 
              android:textSize="36dp" 
              android:textColor="@android:color/white" 
              android:layout_width="wrap_content" 
              android:layout_height="wrap_content"/> 
</LinearLayout>

package com.starboardland.pedometer; 

import android.app.Activity; 
import android.content.Context; 
import android.hardware.*; 
import android.os.Bundle; 
import android.widget.TextView; 
import android.widget.Toast; 

public class MainActivity extends Activity implements SensorEventListener { 

    private SensorManager sensorManager; 
    private TextView count; 
    boolean activityRunning; 

    @Override 
    public **** onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.main); 
        count = (TextView) findViewById(R.id.count); 

        sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE); 
    } 

    @Override 
    protected **** onResume() { 
        super.onResume(); 
        activityRunning = true; 
        Sensor countSensor = sensorManager.getDefaultSensor(Sensor.TYPE_STEP_COUNTER); 
        if (countSensor != null) { 
            sensorManager.registerListener(this, countSensor, SensorManager.SENSOR_DELAY_UI); 
        } else { 
            Toast.makeText(this, "Count sensor not available!", Toast.LENGTH_LONG).show(); 
        } 

    } 

    @Override 
    protected **** onPause() { 
        super.onPause(); 
        activityRunning = false; 
        // if you unregister the last listener, the hardware will stop detecting step events 
//        sensorManager.unregisterListener(this);  
    } 

    @Override 
    public **** onSensorChanged(SensorEvent event) { 
        if (activityRunning) { 
            count.setText(String.valueOf(event.values[0])); 
        } 

    } 

    @Override 
    public **** onAccuracyChanged(Sensor sensor, int accuracy) { 
    } 
}