Average- An android project

Average
An android aplication

Manuela Alvarez
Ipsit Dash

Outline
• Environment

• Open Street Maps

• Our aplication

• Code

• Running the aplication

• What’s next?

• Video demostration

Environment
Eclipse IDE for Java Developers
Android SDK Tools
Apache Tomcat
PostgresSQL OpenSource Database

Open Street Maps
• Lot of possibilities

• Multiple Web tools: ITO OSM tools, OSM
inspector, OpenStreetBugs, Mapnik,
Cloudmade, OpenCycleMap, OpenBusMap

• Android: Mapzen POI Collector (Uses
Cloudmade), Osmand (OSM Automated
Navigation Directions)

Our Aplication
Our aplication allows users getting the average position of a set
of points

Current point Average point

General view of the code
Android Aplication Dynamic Web Database
Main_Activity DynWeb

OnlocationChanged Servlet Location Connect
postgres
(Hub) database
OnCreate (ConnDB)
DisplayLabel
OnDraw

Layout OnlocationChanged: Starts when change in location
Activity_main.xml OnCreate: Sets the display of OSM and Label
DisplayLabel: Says what to show in the label
OnDraw: Draws the points
Servlet: Sets request and response between device and database
Location: Starts when location is changed
Looks what the new position is
Sends position to the database where it is run SQL query
Emulator Get reponse from database
ConnDB: Connects server to database

Code Set request and response

Dynamic Web. Servlet
...
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
// TODO Auto-generated method stub
String point = request.getParameter("point");
if("location".equalsIgnoreCase(point)) {
Location location = new Location();
Location.getLocation(request, response);
}
}
...
Connects server and database
Dynamic Web. Conection to database
...
private Connection connection = null;
public Connection getConn() {
Class.forName("org.postgresql.Driver").newInstance();
String url = "jdbc:postgresql://localhost:5432/postgres" ;
connection = DriverManager.getConnection(url, "postgres" , "postgres" );
}
...

Code
Telling the database
how to store the records
Dynamic Web. Location
...
ConnDB conndb = new ConnDB();
String updateSQL = "insert into allPositions(reportlat, reportlon) select " + lat + ", " + lon;
connect = conndb.getConn();
Statement stmt = connect.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
stmt.executeUpdate(updateSQL);

Statement stmt2 = connect.createStatement();
stmt2.executeQuery("select avg(reportlat) avgreportlat,avg(reportlon) avgreportlon from allPositions");
ResultSet rs = stmt2.getResultSet();
rs.next();
double avglon = rs.getDouble(1);
double avglat = rs.getDouble(2);
DataOutputStream dos = new DataOutputStream(response.getOutputStream());
dos.writeUTF("Succeed:" + avglon + ":" + avglat);

...

Sending a SQL query to get back the average of all latitude
and longitude values that are already store in the database

Code Displaying map

Main_Activity. OnCreate
public void onCreate(Bundle savedInstanceState) {
setContentView(R.layout.activity_main);
mapView = (MapView) this.findViewById(R.id.mapview);
mapView.setTileSource(TileSourceFactory.MAPNIK);
mapView.setBuiltInZoomControls(true);
mapView.setMultiTouchControls(true);
mapController = mapView.getController(); GPS
mapController.setZoom(11);
point = new GeoPoint(59351756, 18057822);
mapController.setCenter(point);

mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5*1000, 10,locListener);

mapView = (MapView) findViewById(R.id.mapview);
mapView.setBuiltInZoomControls(true); Setting zoom
Label = (TextView)findViewById(R.id.Label);
}

Label to show average point coordinates

Code
Main_Activity. OnLocationChanged
... Connect to the server
url = new URL(strUrl);
HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();
urlConn.setDoInput(true);
urlConn.setDoOutput(true);
urlConn.setRequestMethod("POST");
urlConn.setUseCaches(false);
urlConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
urlConn.setRequestProperty("Charest", "utf-8");
urlConn.connect(); Sending latitude and
DataOutputStream dop = new DataOutputStream(urlConn.getOutputStream()); longitude from current
dop.writeBytes("point=" + URLEncoder.encode("location","utf-8"));
dop.writeBytes("&lon=" + URLEncoder.encode(Double.toString(Lon),"utf-8")); positionto the server
dop.writeBytes("&lat=" + URLEncoder.encode(Double.toString(Lat),"utf-8"));
dop.flush();
dop.close();

DataInputStream dis = new DataInputStream(urlConn.getInputStream());
String locPassage = dis.readUTF();
String[] mystrings = locPassage.split(":");
AVGLat = Double.parseDouble(mystrings[1]); Reading latitude and longitude
AVGLon = Double.parseDouble(mystrings[2]);
noavgyet = false;
of the average point of all
recorded points and display
displayLabel(locPassage);
... it in the label

Code Setting the OSM display
Main_Activity. Activiy_main.xml
...
<org.osmdroid.views.MapView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/mapview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:clickable="true" /> Setting the label
<TextView
android:id="@+id/Label"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_margin="5dip"
android:text="Welcome!"
/>
... Drawing the average point
Main_Activity .OnDraw
...
if (!noavgyet) {
GeoPoint pointavg = new GeoPoint((int)(AVGLat*1e6), (int)(AVGLon*1e6));
Paint paint2 = new Paint();
paint2.setColor(Color.GREEN);
Point screenPoint2 = new Point();
mapView.getProjection().toPixels(pointavg, screenPoint2);
Bitmap bmp2 = BitmapFactory.decodeResource(getResources(), R.drawable.dot2);
canvas.drawBitmap(bmp2, screenPoint2.x, screenPoint2.y, paint2);
...

Running the aplication
Simulate GPS with Dalvik Debug Monitor Server
KML file with 5 points in Vaxholm

-- Table: allpositions
Database
-- DROP TABLE allpositions;

CREATE TABLE allpositions
Allpositions table (
With 2 columns: reportlat double precision,
reportlon double precision
reportlat )
reportlon WITH (
OIDS=FALSE
);
ALTER TABLE allpositions OWNER TO postgres;

Running the aplication
Current point

Average point

Use of the app
Imagine you want to build a factory in a city with a certain number of houses

Assume that we know where future workers live

Collect the coordinates from their houses positions

Get average position coordinates

This minimizes the total travelling distance from workers houses to the factory

What’s next
• Add a reset button to clear records from the database
• Add a button for getting GPS coordinates when pushed
• Sharing location between users
• Drawing all recorded points in the display

Thank you!

Video demostration

Average- An android project

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