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PDF Producer: -. PDF Version: -. Page Count: -. Preparing document for printing…. Mobile - Wireless from publicyard. PDF 50KB. Proximity alerts let our ur applications set triggers that are fired when a uuser moves within or beyond a set distance from a geo eographic location.

To set a proximity alert for a given coverage area, select the center point using lon ongitude and latitude values , a radius around thatat point, and an expiry time-out for the alert.

The Busy Coder\'s Guide to Android Development, Version 4.2.pdf

The alertt will w fire if the device crosses over that boundary,ry, both when it moves from outside to within the radius us, and when it moves from inside to beyond it. When en triggered, proximity alerts fire Intents, mostt commonly c broadcast Intents. This cangive us a recognizable context for the locations and coordinates used in location-based services and map-based activities.

The geocoding lookups are done on the server, so our applications will require us to include an Internet uses-permission in our manifest. Reverse Geocoding converts latitude and longitude to corresponding address. Map based Activities To use maps in our applications we need to extend MapActivity. The layout for the new class must then include a MapView to display a Google Maps interface element.

The Android maps library is not a standard Android package; as an optional API, it must be explicitly included in the application manifest before it can be used. MapView controls can be used only within an Activity that extends MapActivity. Override the onCreate method to lay out the screen that includes a MapView, and override isRouteDisplayed to return true if the Activity will be displaying routing information such as traffic directions.

By default the Map View will show the standard street map. In addition, we can choose to display a satellite view, StreetView, and expected traffic, as shown in the following code snippet: mapView. Creating and using Overlays Overlays enable us to add annotations and click handling to MapViews. Each Overlay lets us draw 2D primitives, including text, lines, images, and shapes, directly onto a canvas, which is then overlaid onto a Map View [6]. We can add several Overlays onto a single map. All the Overlays assigned to a Map View are added as layers, with newer layers potentially obscuring older ones.

User clicks are passed through the stack until they are either handled by an Overlay or registered as clicks on the Map View itself. Each Overlay is a canvas with a transparent background that is layered onto a Map View and used to handle map touch events. To add a new Overlay, we create a new class that extends Overlay.

We override the draw method to draw the annotations we want to add, and override onTap to react to user clicks generally made when the usertaps an annotation added by this Overlay. Figure 5.

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Overlays on Maps V. For preparing this application we first we need three activities namely Vol. For preparing the user interfacee oof the activities requesting source and destination ion addresses, we need to use the corresponding XML fi files of the activities. Once the user interface off these th two activities is ready we need to design the userus interface of the Map Activity. As this activ tivity should hold the Google Map, the procedure illu llustrated in the above section should be followe wed for the access to Google Map API.

Then we shou ould create two explicit intents which are generat rated when an event is performed by user like clickingng a button one for communication between the he source passing the source address to destinationn activity and destination and other for comm mmunication between destination and Map Activity pa passing the source and destination addresses to the th Map Activity. The first activity whic hich takes the source address from the user is sho hown in the following figure.

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Figure 6. The second activity is shown in the following fi figure Vol.


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The he MapActivity thus loaded is shown in the followi wing figure. Figure 8. MapActivity displaying route In the above figure the blue circ ircle indicates the source and the green circle indi dicates the destination and the green curved line indicat ates the route between these locations.

They utilize the abilit ility to make use of the geographical position of the moobile device. They can utilize multiple technolog ogies such as the GPS satellite network, cellular networ orks, Wi-Fi networks and other technologies. Conontext awareness is the excellent feature for the LBS. Location Lo Based Services can be used in a variety of aspects like vehicle tracking, monitoring driving hababits, locating our employees, finding the route between be two places or to find the route to a specifiedd location l from current position etc.

All of thesee need n the use of GPS along with some tracking prog ograms.

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Android provides a very nice platform for developing LBS applications. It provides separate ate methods and classes for each and every separa rate entity involved in Vol. Location Based Services thus help the users in a variety of aspects and thus has a greater scope of development in the near future. There are several reasons why a location reading regardless of the source can contain errors and be inaccurate.

Some sources of error in the user location include: 8. Determining which to use and trust is a matter of trade-offs in accuracy, speed, and battery-efficiency. User movement Because the user location changes, you must account for movement by re-estimating user location every so often.

Varying accuracy Location estimates coming from each location source are not consistent in their accuracy. A location obtained 10 seconds ago from one source might be more accurate than the newest location from another or same source. These problems can make it difficult to obtain a reliable user location reading. This document provides information to help you meet these challenges to obtain a reliable location reading.

It also provides ideas that you can use in your application to provide the user with an accurate and responsive geo-location experience. The future work is to eliminate these problems and provide an efficient way to find out the location of user accurately. Rajsekhar Rao for providing guidance in understanding the concepts.

Very small memory storage as small as 64kb. Professor enters the attendance to the mobile using keypad. It is a manual process. After saving the absentees or presenters in to the mobile, teacher can edit the attendance list in the mobile. And this attendance details can send to a computer using GPRS. It was developed considering the requirements of that time and has a very little future scope.

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The system has a limited bounds. It lags behind a lot as when compared to modern day technology such as Windows, Android, iphone. It does not support the GPS technology to reduce the fake attendance. Modules 4. This module is specially designed for staffs, which use mobile phone to take attendance. Each staff enter username and password before enter in to attendance list. In this module Lecturer takes the attendance using the cell phone.

Lecturers select the branch, semester and year. After this session he enters in to attendance page. Here staff makes a mark on the absentees 4. In this module attendance list in the cell phone is sends to the database.