You are currently browsing the Batista R. Harahap posts tagged: location based

Jajan for Android Open Sourced at Github

6 February 2012 Android / API / Augmented Reality / Blog / Location Based Services / Mobile / Open Source / Portfolio / StartupLokal / Technology / Urbanesia / Wikitude API
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Jajan for Android is now Open Sourced at Github a few hours ago. I personally hope that by looking at the source code provided, more and more developers will sync to the tune of how easy it is to create an Android application. I wrote most of the codes 7 August 2011 in under 4 hours. Using ready made libraries already available within Android and also other third party libraries, it helped to ease the complications.

The source code is NOT perfect, there’s a lot of places where it could be optimized aggressively even more. More of the optimization will most definitely lie within the ListView. At any case, it will load 100 search results, you can make this endless by loading an incremental of your choice.

The codes are available at https://github.com/tistaharahap/jajan/.

Excerpts from the README shown below:

JAJAN by Urbanesia
==================

Jajan is a simple app to showcase Urbanesia's API v1.0 and how you can extend for your own apps.

As of this writing, the initial commit is at sync with Jajan's binaries at Android Market which is version 1.1.1. Upcoming Jajan versions will NOT be published from the codebase here in Github, this repository is treated as an example for future third party apps by you.

Jajan is available in multiple platforms, go to , if your device is one of the supported platform, it will redirect to your device's application store or it may have you download a binary for your platform.

Blackberry Coordinates From Cell Tower

5 August 2011 Blackberry / Blog / Location Based Services / Mac / Mobile / Technology / Tutorial / Urbanesia
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I’m beginning to like coding in Blackberry since now an official JDE for Mac is available. Then I decided to have a look and prepare myself for some rather annoying but pleasant surprise from Blackberry’s JDE. To be honest, I don’t like Blackberry’s behavior of complicating simple things. But then I learned a lot from the codes.

Urbanesia is a location based service and therefore location is very important. I’ve been trying out a few ways to get the device’s location and after all the things I’ve tried, I resorted into plain GMM solution. Blackberry’s location API was too slow to get a fix on the device’s location. Nevertheless, the codes are included as well.

The codes should work well from Blackberry OS 5.0 upwards. Haven’t tried with older OS. You might want to wrap calling the methods inside a Thread so it won’t block the UI. My 2 cents about Threading in Blackberry, extend the Thread class, makes life easier.

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package com.urbanesia.api;
 
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
 
import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import javax.microedition.location.Criteria;
import javax.microedition.location.Location;
import javax.microedition.location.LocationException;
import javax.microedition.location.LocationProvider;
 
import net.rim.device.api.system.GPRSInfo;
 
import com.urbanesia.utils.Log;
 
public class CellTowerLocation {
	protected static final int LOOKUP_TIMEOUT = 5000;
	protected static final int LOOKUP_TOLERANCE = 500;
 
	public static final boolean FORCE_LOCATION_UPDATE = true;
	public static final boolean DONT_FORCE_LOCATION_UPDATE = false;
 
	public static String getLocation() {
		Criteria ct = new Criteria();
		ct.setHorizontalAccuracy(1000);
		ct.setVerticalAccuracy(1000);
		ct.setCostAllowed(true);
		ct.setPreferredResponseTime(LOOKUP_TIMEOUT);
		ct.setPreferredPowerConsumption(Criteria.POWER_USAGE_LOW);
 
		String coords = "";
		try {
			LocationProvider lp = LocationProvider.getInstance(ct);
			Location loc = lp.getLocation(LOOKUP_TIMEOUT + LOOKUP_TOLERANCE);
 
			String lat = String.valueOf(loc.getQualifiedCoordinates().getLatitude());
			String lon = String.valueOf(loc.getQualifiedCoordinates().getLongitude());
 
			coords = lat+","+lon;
			Log.out("Coordinates - Exact Location: " + coords);
		} catch (LocationException e) {
			Location loc = LocationProvider.getLastKnownLocation();
			String lat = String.valueOf(loc.getQualifiedCoordinates().getLatitude());
			String lon = String.valueOf(loc.getQualifiedCoordinates().getLongitude());
 
			coords = lat+","+lon;
			Log.out("Coordinates - Using last known location: " + coords);
		} catch (InterruptedException e) {
			Location loc = LocationProvider.getLastKnownLocation();
			String lat = String.valueOf(loc.getQualifiedCoordinates().getLatitude());
			String lon = String.valueOf(loc.getQualifiedCoordinates().getLongitude());
 
			coords = lat+","+lon;
			Log.out("Coordinates - Using last known location: " + coords);
		}
 
		Log.out("Coordinates: " + coords);
		return coords;
	}
 
	public static String getLocation(boolean force) {
		if(force) {
			Criteria ct = new Criteria();
			ct.setHorizontalAccuracy(1000);
			ct.setVerticalAccuracy(1000);
			ct.setCostAllowed(true);
			ct.setPreferredResponseTime(LOOKUP_TIMEOUT);
			ct.setPreferredPowerConsumption(Criteria.POWER_USAGE_LOW);
 
			String coords = "";
			try {
				LocationProvider lp = LocationProvider.getInstance(ct);
				Location loc = lp.getLocation(-1);
 
				String lat = String.valueOf(loc.getQualifiedCoordinates().getLatitude());
				String lon = String.valueOf(loc.getQualifiedCoordinates().getLongitude());
 
				coords = lat+","+lon;
			} catch (Exception e) {
				Location loc = LocationProvider.getLastKnownLocation();
				String lat = String.valueOf(loc.getQualifiedCoordinates().getLatitude());
				String lon = String.valueOf(loc.getQualifiedCoordinates().getLongitude());
 
				coords = lat+","+lon;
			}
 
			Log.out("Coordinates: " + coords);
			return coords;
		} else {
			return getLocation();
		}
	}
 
	public static String getLocationGMM() {
		String coords = "0,0";
		int cellID = GPRSInfo.getCellInfo().getCellId();
		int lac = GPRSInfo.getCellInfo().getLAC();
 
		String urlString = "http://www.google.com/glm/mmap" + ConnString.getConnectionString();
 
		try {
			HttpConnection conn = (HttpConnection) Connector.open(urlString);
			OutputStream os = null;
			InputStream in = null;
 
			conn.setRequestMethod(HttpConnection.POST);
			conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded"); 
			conn.setRequestProperty("If-Modified-Since","29 Oct 1999 19:43:31 GMT");
			conn.setRequestProperty("User-Agent","Urbanesia Jajan Blackberry v1.0");
			conn.setRequestProperty("Content-Language", "en-US");
 
			os = conn.openOutputStream();
			WriteData(os, cellID, lac);
 
			in = conn.openInputStream();
			DataInputStream dataInputStream = new DataInputStream(in);
			dataInputStream.readShort();
			dataInputStream.readByte();
			int code = dataInputStream.readInt();
			if (code == 0) {
				double lat = (double) dataInputStream.readInt() / 1000000D;
			    double lng = (double) dataInputStream.readInt() / 1000000D;
			    dataInputStream.readInt();
			    dataInputStream.readInt();
			    dataInputStream.readUTF();
 
			    coords = Double.toString(lat) + "," + Double.toString(lng);
			    Log.out("Coordinates - Got from GMM: " + coords);
			} else {
				Location loc = LocationProvider.getLastKnownLocation();
				String lat = String.valueOf(loc.getQualifiedCoordinates().getLatitude());
				String lon = String.valueOf(loc.getQualifiedCoordinates().getLongitude());
				coords = lat+","+lon;
				Log.out("Coordinates - Using last known location: " + coords);
			}
		} catch (Exception e) {
			Location loc = LocationProvider.getLastKnownLocation();
			String lat = String.valueOf(loc.getQualifiedCoordinates().getLatitude());
			String lon = String.valueOf(loc.getQualifiedCoordinates().getLongitude());
			coords = lat+","+lon;
			Log.out("Coordinates - Using last known location: " + coords);
		}
 
		return coords;
	}
 
	private static void WriteData(OutputStream out, int cellID, int lac) throws IOException  {
		DataOutputStream dataOutputStream = new DataOutputStream(out);
		dataOutputStream.writeShort(21);
        dataOutputStream.writeLong(0);
        dataOutputStream.writeUTF("en");
        dataOutputStream.writeUTF("Android");
        dataOutputStream.writeUTF("1.0");
        dataOutputStream.writeUTF("Web");
        dataOutputStream.writeByte(27);
        dataOutputStream.writeInt(0);
        dataOutputStream.writeInt(0);
        dataOutputStream.writeInt(3);
        dataOutputStream.writeUTF("");
 
        dataOutputStream.writeInt(cellID);  
        dataOutputStream.writeInt(lac);     
 
        dataOutputStream.writeInt(0);
        dataOutputStream.writeInt(0);
        dataOutputStream.writeInt(0);
        dataOutputStream.writeInt(0);
        dataOutputStream.flush();
	}	
}
photo of Batista Batista R Harahap [email protected]
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Cilandak , DKI Jakarta , 12450 Indonesia
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