testing proxi sensor with volume up

AndroidProximitySensorActivity.java

package com.exercise.AndroidProximitySensor;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.net.Uri;
import android.os.Bundle;
import android.view.KeyEvent;
import android.widget.TextView;
import android.widget.Toast;

public class AndroidProximitySensorActivity extends Activity {
	/** Called when the activity is first created. */

	TextView ProximitySensor, ProximityMax, ProximityReading;

	SensorManager mySensorManager;
	Sensor myProximitySensor;
	final float alpha = (float) 0.8;
	float gravity[] = new float[3];
	float linear_acceleration[] = new float[3];

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		ProximitySensor = (TextView) findViewById(R.id.proximitySensor);
		ProximityMax = (TextView) findViewById(R.id.proximityMax);
		ProximityReading = (TextView) findViewById(R.id.proximityReading);

		mySensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
		myProximitySensor = mySensorManager
				.getDefaultSensor(Sensor.TYPE_PROXIMITY);

		if (myProximitySensor == null) {
			ProximitySensor.setText("No Proximity Sensor!");
		} else {
			ProximitySensor.setText(myProximitySensor.getName());
			ProximityMax.setText("Maximum Range: "
					+ String.valueOf(myProximitySensor.getMaximumRange()));

            //mySensorManager.registerListener(proximitySensorEventListener,myProximitySensor,SensorManager.SENSOR_DELAY_NORMAL);


        }
	}
    public int count;
	@Override
	public boolean onKeyDown(int keycode, KeyEvent e) {

        count=0;
		if (e.getKeyCode() == KeyEvent.KEYCODE_VOLUME_UP) {
            count++;
//			Toast.makeText(getApplicationContext(),
//					"In!!! =)", Toast.LENGTH_LONG).show();

            mySensorManager.registerListener(proximitySensorEventListener,
                    myProximitySensor,
                    SensorManager.SENSOR_DELAY_NORMAL);


			return true;
		}

		return super.onKeyDown(keycode, e);
	}

	
	SensorEventListener proximitySensorEventListener = new SensorEventListener() {

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

		}

		@Override
		public void onSensorChanged(SensorEvent event) {
			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];

			if (event.sensor.getType() == Sensor.TYPE_PROXIMITY) {

				ProximityReading.setText("Proximity Sensor Reading:"
						+ String.valueOf((int) linear_acceleration[0]) + "  "
						+ String.valueOf((int) linear_acceleration[1]) + "  "
						+ String.valueOf((int) linear_acceleration[2]));

			}
		}
	};
}