public class MainActivity extends Activity implements SensorEventListener{

    private int mShakeValue;
    private final static int SENSITIVITY = 7;

    private boolean mInitialized;
    private SensorManager mSensorManager;
    private Sensor mAccelerometer;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mShakeValue = 0;
        setContentView(R.layout.activity_main);
        mInitialized = false;
        mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
        mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_NORMAL);

        final Button button = (Button) findViewById(R.id.button1);
        button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                // Resets Shake Value to 0
                TextView numberShakes = (TextView)findViewById( R.id.textView2);
                numberShakes.setText(Integer.toString(0));
            }
        });

    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
      super.onConfigurationChanged(newConfig);
      TextView numberShakes = (TextView)findViewById( R.id.textView2);
      numberShakes.setText(numberShakes.getText());
    }

    protected void onResume() {
        super.onResume();
        mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_NORMAL);
    }

    protected void onPause() {
        super.onPause();
        mSensorManager.unregisterListener(this);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

    //Volume buttons are overridden
    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        int keyCode = event.getKeyCode();
        switch (keyCode) {
        case KeyEvent.KEYCODE_VOLUME_UP:
        case KeyEvent.KEYCODE_VOLUME_DOWN:
            return true;
        default:
            return super.dispatchKeyEvent(event);
        }
    }

    @Override
    public void onSensorChanged(SensorEvent event){
        // alpha is calculated as t / (t + dT)
        // with t, the low-pass filter's time-constant
        // and dT, the event delivery rate

        TextView numberShakes = (TextView)findViewById( R.id.textView2);


        if (!mInitialized) {
            mInitialized = true;
        } else {
            float[] gravity = new float[3];
            float[] linear_acceleration = new float[3];

            final float alpha = (float) 0.8;

            gravity[0] = alpha * gravity[0] + (1 - alpha) * event.values[0];
            gravity[1] = alpha * gravity[1] + (1 - alpha) * event.values[1];
            gravity[2] = alpha * gravity[2] + (1 - alpha) * event.values[2];

            linear_acceleration[0] = event.values[0] - gravity[0];
            linear_acceleration[1] = event.values[1] - gravity[1];
            linear_acceleration[2] = event.values[2] - gravity[2];
            System.out.println(linear_acceleration[0]+" , "+ linear_acceleration[1]+" , "+linear_acceleration[2]+" , ");

            mShakeValue = Integer.parseInt((String) numberShakes.getText());
            if(/*linear_acceleration[0] > SENSITIVITY || linear_acceleration[1] > SENSITIVITY ||*/ linear_acceleration[2] > SENSITIVITY && linear_acceleration[2]>0){

                numberShakes.setText(Integer.toString(++mShakeValue));
                System.out.println(numberShakes);
            }
        }
    }

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

    }



}