BlackBerry Development Fundamentals

package com.bbdevfundamentals.SensorTest;

import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.ui.component.LabelField;
import net.rim.device.api.ui.container.MainScreen;
import net.rim.device.api.system.Application;
import net.rim.device.api.system.SensorListener;
import net.rim.device.api.system.Sensor;

//Create the HelloWorld class
public class SensorTest extends UiApplication implements SensorListener {

 public static void main(String[] args) {
 // Instantiate the HelloWorld object
 SensorTest st = new SensorTest();
 // Enter the Event Dispatcher
 st.enterEventDispatcher();
 }

 public SensorTest() {
 // Create the HelloWorldScreen and open it
 pushScreen(new SensorTestScreen());
 Sensor.addListener(Application.getApplication(), this, Sensor.HOLSTER);
 }

 public void onSensorUpdate(int sensorId, int update) {
 if (update == Sensor.STATE_IN_HOLSTER) {
 Dialog.alert("Device is holstered");                
 } else {
 Dialog.alert("Device is not holstered");
 }
 }
}

final class SensorTestScreen extends MainScreen {

 public SensorTestScreen() {
 super();
 // Create the screen's title
 LabelField lblTitle = new LabelField("Sensor Test", LabelField.ELLIPSIS
 | LabelField.USE_ALL_WIDTH);
 setTitle(lblTitle);
 }

}