Recently I am working on product where I have been assigned to some interesting charting related tasks. As part of an assignment, I needed to convert bunch of PNGs to SVGs with embedded base64 png image as charting API I was working on written to accept SVG only so I wrote following python script which does this bulk conversion.

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import os
startSvgTag = """<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg version="1.1"
xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink"
width="240px" height="240px" viewBox="0 0 240 240">"""

endSvgTag = """</svg>"""
for files in os.listdir("."):
    if files.endswith(".png"):
      pngFile = open(files, 'rb')
      base64data = pngFile.read().encode("base64").replace('\n','')
      base64String = '<image xlink:href="data:image/png;base64,{0}" width="240" height="240" x="0" y="0" />'.format(base64data)

      f = open(os.path.splitext(files)[0]+".svg",'w')
      f.write( startSvgTag + base64String + endSvgTag)
      print 'Converted '+ files + ' to ' + os.path.splitext(files)[0]+".svg"

Basically we will be converting PNG image to base64 format string and we will be using it an SVG using the template String by string concatenation. A Just run this script in directory where you have your pngs.

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sachin@sachin-VPCF226FM:~/download/icons$ python png2svg.py

Life is short - you need Python!

After I moved to United States, I found interesting concept here to sell unused items in your home, called as Garage Sale or Yard sale. The garage sale sell the used thing but it’s still good quality. You can buy something with the cheap price over there. You can save much money from buying yard sale.

But its bit hard to find garage sale which will interesting and near to you, so I decided to use my android development skills to write app to do this which will use current GPS or user entered location to find garage sales and allow search using item names like chairs, books etc. Initial work of android application is complete and its google play now, named as “Garagesaledroid”,

Garagesaledroid which lets you to find garage sales near you. It talks to appengine service which actually aggregates the sale data from various site together as result you get large database of sales in this app. Following is the list of features,

Current features:

• Find garage sale near you using GPS or preferred location.
• Filter sale by distance (aerial), sale day, item or location.
• View sale details and get driving direction or navigation instructions.
• View sales on google maps with detailed map balloon.
• Aggregated large sale database.

Upcoming features:

• Save and organize Favourite sale
• Get Real time notifications for newly added sales.
• Set reminders for sale dates.
• and You can also suggest new feature!

Following are some screenshots from application:

Happy Shopping.

Thanks,

Sachin.

During last cricket world cup, I developed cricket score android application named as cricscoredroid. I had taken this application off from android market for 6 months now as there was not free score provider was available after world cup.

Cricscoredroid was very popular during cricket world cup, it had 4.5 rating in android market and was installed by more than 25k users within 2 months of its release. Reason of its popularity was its very simple and fastest in android market. Also it has some unique notification features.

Cricscoredroid is back in Google Play now with lots UI improvements. Cricscoredroid now features Android HOLO dark theme and Honeycomb styled Action Bar using HoloEverywhere and ActionBarSherlock . What this library does is that if you’re using your app in a device with Android 2.x, it gives you an ActionBar that is a copy of the real Honeycomb ActionBar, thanks to Jake Wharton , a guy who created this library.

It is available on Google Play . Use and rate it on google play!. Screenshots of cricscoredroid with new Holo Dark theme,

Have fun!

If you tried Eclipse Juno, you may see strange behaviour with open tabs in editors. Juno has stopped retaining open file tabs tabs. If you open new file using Ctrl Shift R, it closes last active file . This behaviour is started in Juno.

If you take a look in the preferences, in the appearance section, you won’t find anything related to this.

The good news is that I found fix, rather work around :). Go to Preferences -> General -> Appearance and switch to the Classic theme. Yes, switching theme solved this issue.

I am still looking for correct fix, let me know if you find one.

Today after upgrading eclipse to juno(4.2) and installing subclipse 1.6, I got following error on Ubuntu 12.04 installtion,

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Failed to load JavaHL Library.
    These are the errors that were encountered:
    no libsvnjavahl-1 in java.library.path
    no svnjavahl-1 in java.library.path
    no svnjavahl in java.library.path
    java.library.path = /usr/lib/jni:/lib

I run into this error every time I upgrade eclipse as subclipse needs javahl library. Usually a fix is to install javahl from ubuntu repo,

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sudo apt-get install libsvn-java

But this time it did not fix the issue, I got same error after restarting eclipse.

I found that javahl library location has been changed to /usr/lib/x86_64-linux-gnu/jni on ubuntu 64 (12.04) using find command

So updated java.library.path location in $ECLIPSE_HOME/eclipse.ini file from

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-Djava.library.path=/usr/lib/jni

to

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-Djava.library.path=/usr/lib/x86_64-linux-gnu/jni

and that did the trick!

I had a problem with Google GSON deserialization. JSON data which I was trying to parse using GSON library looks like this {"matches":{"matchId":"bla" "score" : "bla"}} and when there is more roles available it looks like this {"matches":[{"matchId":"bla" "score" : "bla"}{"matchId":"hihi" "score" : "hihi"}]}. So sometimes “matches” data comes as “Object” or “ARRAY” format depending upon number of matches available.

GSON fails as expected to parse this in to Java class which has field of type List class, When JSON data comes with matches as “Object” format, it throws exception “Expected BEGIN_ARRAY but was BEGIN_OBJECT”.

Source JSON data it self is bogus here, correct fix should be at JSON generator which should always return ARRAY format for array objects irrespective of number of objects being sent.

Unfortunately I don’t have access to JSON response generator, so I decided to write own GSON’s TypeAdapter implementation for List type which handles this single instance case, deserializes it and then transform into an List and set it on the field, making it uniform.

Following is implementation of ArrayAdapterFactory,

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package com.blog.util;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.TypeAdapter;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.JsonWriter;


public class ArrayAdapter<T> extends TypeAdapter<List<T>> {
  private Class<T> adapterclass;

  public ArrayAdapter(Class<T> adapterclass) {
      this.adapterclass = adapterclass;
  }

  public List<T> read(JsonReader reader) throws IOException {

      List<T> list = new ArrayList<T>();

      Gson gson = new GsonBuilder()
              .registerTypeAdapterFactory(new ArrayAdapterFactory())
              .create();

      if (reader.peek() == JsonToken.BEGIN_OBJECT) {
          T inning = gson.fromJson(reader, adapterclass);
          list.add(inning);

      } else if (reader.peek() == JsonToken.BEGIN_ARRAY) {

          reader.beginArray();
          while (reader.hasNext()) {
              T inning = gson.fromJson(reader, adapterclass);
              list.add(inning);
          }
          reader.endArray();

      }

      return list;
  }

  public void write(JsonWriter writer, List<T> value) throws IOException {

  }

}

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package com.blog.util;;

import java.lang.reflect.ParameterizedType;
import java.util.List;

import com.google.gson.Gson;
import com.google.gson.TypeAdapter;
import com.google.gson.TypeAdapterFactory;
import com.google.gson.reflect.TypeToken;

public class ArrayAdapterFactory implements TypeAdapterFactory {

  @SuppressWarnings({ "unchecked", "rawtypes" })
  @Override
  public <T> TypeAdapter<T> create(final Gson gson, final TypeToken<T> type) {

      TypeAdapter<T> typeAdapter = null;

      try {
          if (type.getRawType() == List.class)
              typeAdapter = new ArrayAdapter(
                      (Class) ((ParameterizedType) type.getType())
                              .getActualTypeArguments()[0]);
      } catch (Exception e) {
          e.printStackTrace();
      }

      return typeAdapter;
      

  }

}

While constructing GSON instance, I assigned TypeAdapterFactory with ArrayAdapterFactory to GsonBuilder,

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Gson gson = new GsonBuilder().registerTypeAdapterFactory(new ArrayAdapterFactory()).create();

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