Colin's Journal: A place for thoughts about politics, software, and daily life.

ExpenseClam
Easy-to-use business expense tracker for Android.

ExpenseClam for Android

May 12th, 2013

Mileage in ExpenseClam

In previous releases of ExpenseClam I’ve introduced two major new features: mileage and attachments. Of the two, mileage proved to be the easier to do within the existing application structure.

When designing the mileage functionality I decided early on that I wanted to make mileage work the same way as other types of expense as closely as possible. Mileage expenses would appear in the same list of unclaimed expenses, be exported in the same spreadsheet file and be moved into claims in the same fashion.

The easiest way to do this would be to have a mileage specific screen that generated expense records using exactly the same format as normal expenses. This approach is used by a number of competitors and is very lightweight to implement.

The downside to this design is that once a mileage record has been entered it loses mileage specific fields (such as distance, mileage rate, etc).  I decided on a slightly more involved way of solving the problem: extending the expenses records to have mileage specific fields and creating a specific set of screens for creating and editing mileage records.

The code that lists expenses required only minor tweaking in order to distinguish between the two record types. The export code required additional columns in the spreadsheet output for mileage records, and code for managing expenses in claims was unchanged.

When a new or existing expense is opened ExpenseClam determines which UI is required and launches the appropriate Activity. Both sets of screens have a common super class that contains all the common logic for managing the life cycle of creating, discarding and saving expenses. Code for handling receipts is restricted to the expense handling class, while distance calculation logic is restricted to the mileage class, hopefully making maintenance easy.

If I had dropped support for Android versions earlier than Honeycomb I could probably have maintained a common activity and used separate fragments to achieve the same effect. However to support Gingerbread and earlier I have most of the Actionbar logic in the Activities, along with code for coordinating interactions between other Activities.

May 5th, 2013

SwiftKey and trailing spaces

During testing of the latest version of ExpenseClam (released just last week), I stumbled across a small issue that I’ve not seen before.

Until recently I was using a back port of the Jelly Bean keyboard on my phone. I really like the swiping of characters implementation and find the auto correct to be rather good, although the prediction is rather limited.

Since SwiftKey released their version of character swiping (called SwiftKey Flow), I’ve been using it on my phone, and it’s generally good enough that I’ve not switched back to the Jelly Bean keyboard.

Now on to the issue: trailing spaces. Having swiped across letters to form a word, SwiftKey populates the word, and adds a space ready for entering the next word. Unfortunately this space isn’t just for show, it is populated in the widget value, so when the contents of the field are saved it includes the trailing space.

In general this is mostly harmless, however if you spot the trailing space and delete it, you can end up with two database records that look the same, but are actually different. This makes auto complete on fields less useful and potentially confusing.

The fix is easy enough, I just trim the string before saving to the database, but it would have been better if SwiftKey had used the same approach as Google and inserted the space at the start of a swipe rather than at the end.

November 26th, 2012

Android device compatibility

It took me two days of digging around to finally figure out why ExpenseClam was not working properly on the HTC One X. The symptoms were straightforward enough: taking a picture would show a blank result, and the expense record showed a warning icon saying that the image file could not be loaded.

By adding some debug cpde, and with the help of a friend who owns the device, I was able to confirm that the camera code was creating an image file and that it was successfully saved. By signing up to testdroid.com I could get access to the logcat output of a real device on the cloud, which gave me the next breakthrough. My call to BitmapFactory.decodeFile was failing to return a bitmap, in turn caused by SkImageDecoder returning null.

Searching online sent me chasing a few red herrings, but eventually I had the idea of removing the code which sets the thumbnail size before taking the photo. Suddenly it worked, the bitmap correctly loads. So what went wrong?

The API documentation for setJpegThumbnailSize is fairly unambiguous “If applications set both width and height to 0, EXIF will not contain thumbnail.” Further to this the method getSupportedJpegThumbnailSizes states “This method will always return a list with at least two elements. Size 0,0 (no thumbnail) is always supported.” Based on this I had chosen to disable thumbnails in order to reduce image file sizes.

It turns out that only most devices support this. The HTC One X accepts setting the thumbnail size to 0, but then produces a file that the BitmapFactory cannot read. Leaving the thumbnail settings to the device defaults works.

Hopefully this post will save someone else a couple of days investigation.

August 12th, 2012

Nexus 7

It’s been a long time since my last post, with the birth of our daughter taking up all of my nonworking time. I have however purchased a Nexus 7, now being able to see how the 7″ tablet running android compares to the playbook.

I haven’t yet tried travelling with the tablet, but for use at home, it blows away the playbook for usefulness. The experience is not perfect by any stretch. The BBC are yet to provide an iPlayer app that works without flash, so you have to use workarounds to watch TV. The Economist, fantastic publication though it is, have produced a rubbish android app that doesn’t support ICS, never mind Jelly Bean.

Putting to one side these niggles, most of the important apps are there and work well. The chrome web browser provides a good experience, with rendering much faster than the playbook. Games play fluidly on the Tegra 3 powered machine, with the vibrant screen providing an almost SciFi feel in such a slim form factor.

The keyboard is good, certainly the best soft keyboard I’ve used. It is a little sluggish at times, with some key taps not registering as well as you would hope. Strangely tapping quickly seems to work better than trying for accuracy.

While the bundled Transformers movie is a terrible film, it does show off the tablet to good effect, with the movie streamed in HD, and looking very crisp on the high resolution screen. It also further justifies having an unlimited broadband package as the one film weighed in at over 5GB of streamed data. Uploading my own DVDs was fiddly from Linux, but should be straightforward from windows or Mac OS.

In conclusion, while the Nexus 7 may not be a substitute for a laptop in the way that an Asus Transformer could be, it makes a great content consumption device. If the alternative for content creation is your phone, the 7 inch screen works far better, while retaining a lot of portability that a large device sacrifices.

The killer feature for me is the weight. Holding the tablet for extended periods is as comfortable as holding a paperback book, possibly more so. The Nexus is the first device for which I reach for most online tasks, with the desktop relegated to development and photo editing.

April 8th, 2012

Blackberry Playbook

I’ve recently acquired a blackberry playbook by porting ExpenseClam to this platform. The physical format of a 7 inch tablet seems to work very well. It is still small enough that carrying the device around is very easy, and holding it in one hand is entirely comfortable. Meanwhile the screen is just large enough that websites can be viewed in their desktop format, without having to zoom in and scroll.

That’s the good news. The bad news is that the quality of available apps is very low. Most of the big name apps are missing (e.g. no Skype). There are many ported Android apps, but these work only partially. Native Android features are missing and they have a tenancy to hang.

Native apps that I have found suffer from a clunky keyboard implementation, and flaky UI widgets. The Web browser is reasonable, but occasionally suffers from unresponsive UI elements.

My overall impression is that the tablet would be far more useful and interesting if it was running Android ice cream sandwich. This leaves me wondering whether I want to get either a 10 inch tablet our something around the 7 inch mark.

To sum up: when writing this post, I started on the tablet, but the application hung, and I ended up retyping it on my phone. It is hard to see the playbook platform being a success given it’s current state.

January 5th, 2012

App rankings in the Android market

For an app that only recently moved into the 100-500 downloads range, the paid version of ExpenseClam is doing remarkably well. As of writing this, ExpenseClam is number 65 on the list of top grossing apps in the Business category on the Android market.

Looking at the next lower ranked app however I think this is down to how the market treats apps that change categories. Number 66 is an app called SMS super faker, which appears to have always cost the same as ExpenseClam, but is in the 1,000-5,000 download range. According to AppBrain it switched from the Communication to the Business category on the 23rd of December 2010, 6 days before reaching the 1,000  downloads mark. The only explanation I can think of for having a lower gross revenue than ExpenseClam is that it has had far fewer downloads in its new category than previously.

Similarly number 70 (calendar scroll widget agenda) also has far more downloads than ExpenseClam, but has recently changed category.

The lesson to learn from this appears to be that changing category within the market is penalised, at least as far as the top grossing lists are concerned.  Whether this impacts app exposure is another matter. How many apps are purchased as a result of browsing the lower echelons of the top grossing list, versus searching and picking from the featured and staff choices lists is unknown.

January 1st, 2012

Tablet versus NetBook

I’m struggling to decide on whether a NetBook or a tablet would be better suited for me. The tablet would be an Android one, probably the new transformer prime from Asus. It would allow me to test tablet specific designs for ExpenseClam and would provide a more convenient form factor for web browsing than my phone. The transformer also has a keyboard attachment, so writing blog posts and even some web site design should be easy.

A NetBook on the other hand would allow me to do Android development while travelling, and even at home on the sofa, rather than isolating myself away in the study.

In theory I could use VNC, or some other remote desktop software to control my desktop from a tablet, but in practise I expect this to be clunky at best. I could get both a tablet and a NetBook, however I know that when travelling I would only want to carry one, not two machines with me.

At the moment I’m leaning towards the tablet. While ExpenseClam works fine on tablets, it uses the same layout as for phones. I should be able to design a layout that really takes advantage of the extra screen space available on tablets. It also feels like a more modern investment than what is essentially a small laptop.

This post is a bit of an experiment as it had all been written on my phone using the latest WordPress app. Overall not a bad experience, mainly thanks to the Swype keyboard.

September 7th, 2011

Android Market Experience

The Android Market continues to struggle in providing a great end user experience.  To illustrate, here’s what I went through when purchasing Carcassonne tonight:

Dolomites

Dolomites looking desolate

  • I had bookmarked the Carcassonne page on the market a few weeks ago, so when I decided to buy it, I followed the bookmark.  The advertised price was £1.75.
  • I clicked on purchase, and the site prompted me to login, which I did.  The “review your purchase” pop-up appeared, but listed the price as €1.99, and was missing the Confirm button.
  • Deciding that the phone version may work better, I searched on my phone for Carcassone, and saw the price listed as £3.49.
  • Thinking that a lower price sounded better, I tried various re-loads of the page in my browser with no luck – the “review your purchase” pop-up grew a “Confirm” button, but it was greyed out and would not work.
  • I tried searching in the web based version of the market for Carcassone.  The result was a listed price of £3.49.
  • Giving it one last go, I followed the search result link, and it brought up the page showing the price as £1.75.
  • Selecting purchase I was shown the confirmation dialog with a price of €1.99, and a working “Confirm” button.
  • Upon clicking Confirm the app started downloading on my phone – and the website showed a confirmation that I had purchased the game for £1.75.
  • Finally my Google Checkout receipt arrived, showing the actual transaction cost €1.99

It’s fairly amazing that my own app (ExpenseClam) receives any purchases at all given the difficulty involved!

I should add that it was worth persevering – the game is rather good!

June 20th, 2011

ExpenseClam – finding the currency

Stair case

Stair case

Yesterday I released ExpeneseClam, a business expenses tracking app for Android.  Recording expenses on a smartphone can be a painful experience, typos are common, expense claims are not always made in chronological order, and there is usually little time to note down how much a taxi cost.  ExpenseClam has a number of features to help make this easier.  Simple things like auto-suggesting expense descriptions based on the amount entered can make it much quicker to record common recurring expenses.

One of the niftiest features in ExpenseClam is something that you will only stumble across if you travel a lot: it auto selects the default currency for a new expense based on the country you are in.  This is done without needing user permission to determine location, carry out reverse geocoding or even internet access.

The secret sauce is Android’s TelephonyManager and it’s method getNetworkCountryIso().  This method returns the ISO code given by the mobile operator for the network that you are connected to (the Mobile Country Code).  From this a Locale object can be created, which then allows the Currency instance to be created.  None of this requires network traffic and it takes very little processing power to complete.

Changes in the default currency only happens when the country changes.  This is to avoid frustrating users who have to enter expenses in a different currency to this default.  The country derived currency is however prioritised in the list of currencies to make selection easier for what is likely to be a common choice.

February 13th, 2011

Android a challenge to OEMs?

Does the “Android Monopoly” really provide a challenge to the traditional OEMs? Is the answer to use virtualisation on the handset and put Android in a virtual machine sandbox while the OEM’s own O/S runs underneath it?  That’s Andreas Constantinou’s proposal in his latest blog post at VisionMobile. I’m not so sure.  Firstly let’s take a brief look at the history of the OEMs he identifies as losing out due to the success of Android: Motorola and Sony Ericsson.

Toronto sunset at the beaches

Toronto sunset at the beaches

Motorola’s success story pre-Android was the Razr.  This was a huge phone in 2005 and dragged Motorola into second place behind Nokia.  The success of the Razr had little to do with the software that it ran, and a lot to do with the very distinctive and stylish design. Motorola failed to innovate effectively off the back of this however, resulting in a whole series of similar phones and declining market share.  It is only with their adoption of Android that Motorola has been able to rescue themselves from terminal decline in the mobile market.  The Droid series of phones built for Verizon have been very successful for them, bringing the company (now split off as Motorola Mobility) back from the brink.

Sony Ericsson’s history contains more highlights than Motorola’s, but is also a mixed record.  They have used a number of operating systems over the years, with Symbian (using the UIQ interface) and Windows Mobile both playing a part.  Sony Ericsson has been able to differentiate with their Walkman and Cyber-shot brands, both of which relied more on innovation in hardware than software.  Sony Ericsson have produced a range of Android smart phones, which has done much to restore their financial health (to the tune of €1.1bn).

Hardware has always been a major differentiator between mobile OEMs, marking a significant difference between the mobile and personal computing industry.  This traditional strength is not undermined by Google being the driving force behind Android.  OEMs adopting Android get for free the things they have traditionally struggled with: a best-in-class smart phone O/S, app store and cloud services.  This allows them to focus on the part of the equation where they have seen past successes and that aligns to their core competencies.

The announcements coming out of Mobile World Congress this year (and CES before it) shows that there is plenty of room for innovation in hardware and software:

  • Sony Ericsson offering the Xperia Play.  This shows that both hardware innovation (slide out game control pad) can be done alongside corresponding software innovation that sits on-top of Android (the PlayStation Store).
  • Motorola announced the Atrix.  This again shows innovation in both hardware and software, with a docking station that provides a desktop experience when the phone is plugged in.
  • The LG Optimus 3D provides both 3D capture through dual cameras, but also a 3D stereoscopic screen.
  • Samsung are generally sticking with a tried and tested form factor, but are innovating with the screen, the thickness of the phone and the inclusion of NFC in the Galaxy 2.

If Google is restricting what OEMs can do on the hardware and software front, I don’t see much evidence of it in the products that they are announcing, or an opportunity to do more by using virtualisation.

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Copyright 2009 Colin Stewart

Email: colin@owlfish.com