Technology

How to Implement the Backpropagation Algorithm


Unfortunately, typesetting math in WordPress.com is painful, painful, painful
So instead battling WordPress, I’m gonna use my notebook for this post.

As usual, there is code! https://github.com/frankandrobot/mustached-octo-neuralnetwork

(Oh and as of 12/8/2013, my notebook is visually ugly. Will style it later.)

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Technology

Table Joins/Unions and ContentProviders: Reminderer


Ever since I wrote the new ContentProvider framework, Reminderer had this annoying bug where it wouldn’t auto-refresh the open tasks list whenever you added a new task. You added a task but the darn task wouldn’t show on the list until you rotated the phone.

The first approach was to force reload the Loader every time the fragment gets focus. While this hack works, its just that—a hack. This approach quickly becomes inefficient once the task list gets unduly large (as in hundreds of tasks). The second approach was to use a ContentObserver to listen for changes in the database. Fortunately, for some reason, as I’ll explain shortly, the content observer wouldn’t listen to changes in the table.

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Technology

Off the Beaten Path: Reminderer


I’ve spent the past week fixing some persistent and annoying bugs. More on those later. Being a fan of the KISS principle, I think its better to polish what I have so far before adding more features rather than… adding a gazillion features that half work. So you can follow the latest progress in the dogFood branch.

The immediate goal is to make the “open tasks” activity more polished:

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Technology

Rearrangeable List View Rows: Reminderer


Project View

I’ve been pretty busy at work, so I haven’t had as much time to work on Reminderer. The screenshot on the right shows the main page for Projects (aka categories)—you can now organize TODOs by project (1 project per TODO). Yes, the row height is too small to be user friendly but at this point I’m still working on the core functionality.

Rearrangeable List View Rows

One of the things that the UI will need is the ability to intuitively rearrange/reorder data, whether its projects or TODOs. Continue reading

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Technology

End of Phase 1: Reminderer


first screenshot

I finally finished the first draft of the alarm system! Yay. Screenshot on the right.

“Wait,” you might be saying to yourself, “That app looks like crap.” And you’re right. I’ve been focusing strictly on the back end. With that out of the way, I can now dog food the app. Normally, I work from the outside in—create a UI first then add backend functionality as needed. In this case, the alarm system is so straightforward (yet interconnected) that it made more sense to complete it first.

What’s next?

The immediate next step is to add folders or categories. Each alarm can belong to one folder/category. Each folder/category has its own view. You’ll also be able to add an unlimited number of subtasks to a task, with unlimited hierarchy. Eventually there will also be tags to put tasks in multiple categories.

I’m also going to start surveying similar apps.

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