We designed and printed our team shirt to wear on STePS day


And print our poster for STePS


We set up a website to show a live “Number of Focus minutes of all our users”, and use an iPad to display it during STePS.

During STePS, we have to give 100 “How the app works” speeches, really wear me out afterwards. I had my first experience as a exhibitor at STePS.

IMG_2016-11-20 23:15:43.jpg

Although our team didn’t win, CS3216 final project has brought me two things more than that. First is my teammates. They are the best I can ask for even though we didn’t win. I learnt a lot from them, and working with them is really joyful. Second I get to experience full life cycle of a product (from design, implementation to publishing and marketing). I hope to start it all over again, and this time, I am confident I will do much better (hopefully in CS3217).

Bring Jaedye to live

In this week, we have gone into the final stage of the app and start marketing our marketing plan.

We started off purchasing a Google play account and publish a beta version of the app, as well as setting up our Facebook page. After we published our beta version and ask as many of our friends to download and use as possible, we received tons of feedbacks from them. Most of the feedbacks are actually good idea and we have implemented them. For example, our music feature originally will use tracks from users’ phone local storage. However, most users now do not store music tracks on their phones (they often stream music online). So we include our own Mindful Music into the app itself. We also find the problem explaining how the app work to the users. Although there is a tutorial session when you first install the app, most frequently asked question I got from my friends was “How the it work”. As we put the button label “Start Training”, most of them do not know that after setting the timer, you can go and do whatever you want to focus on (studying, sleeping, eating and so on), they were expecting the app to show them something for them to train. Also one lesson we learnt that many users actually don’t read our tutorial (LOL), even though they are extremely short. I learnt two lessons from this incidence. First we should release our beta version earlier and ask for feedbacks from our close friends. As developers, sometimes we cannot know what the users need as good as users themselves. In our case, feedbacks from them are very constructive and valuable ways of improvement we can consider for our app. Second, we should focus more on the UX rather than UI. I often found myself looking to make the UI as beautiful and catchy as possible without considering much about the UX. As a result, in our consultation with Su Yuen, she was completely lost in our app. We try to fix it by adding a one-time tutorial in the app, but many users neglected this and found the app confusing. We should have consult users (a random friend) about our app at a very early stage to see if he understand the app flow, and based on his feedback to design a UI that is intuitive to users.

We also decided on using stickers, posters and Facebook posts for marketing.


Cutting these stickers is a pain >.<“, luckily we managed to borrow a paper cutter so that it can be done in a few hours. We pasted the stickers in common studying areas around NUS. Unfortunately the best place to paste them is in the library, but we don’t have permission to do that so … we can’t.


Aside from stickers, we also have posters with catchy phrase to get the attention of reader and motivate them to take a look at our app.


Jaedye week 11

This week, our aim is to settle part of the UI as we are having consultation with Su Yuen on Tuesday. However, the challenge and social mode was not done yet so I and Yuchuan continue to work to complete it, while Van and Derek focusing on polishing the UI.

We started off by having a meeting and decide what UI element need to be improved, compiled it into a list, then each member can refer to that list and work. In the mean time, I try to get the functionality of the challenge mode up.

While doing the challenge mode, I came across many interesting problem. Challenge mode will display a list of challenges in which the user participate in. This will be fetch from our server. Initially I want to store this list in the database so that it can serve the user faster and work offline. However, a lot of foreseen problems arise in this approach. First, when should I fetch data from the server? Should the data be fetched when user access the challenge page (this will make no difference with fetching data directly without storing as we need to make API call and wait for response), or should the data be fetched periodically (this may affect performance even if the user does not use challenge at all, and the data on challenge page is not real time). Second, if I was to store data in the database, how should I update them with new information. After asking around, I found that the correct way to do this is to attach an last_update time-stamp when sending a request to the server, and the server will return only the record that was changed. Then we have to update these records one by one in the database. However, this approach is not very applicable to our app as the challenge data will definitely changed (as the challenge involve multiple players). Hence, after consider the good and bad of storing data locally, I decide that we will not store it on the phone and the data will be fetch directly from server on the page load itself. This simplify the problem dramatically. But it will result in longer page load and higher data usage.

On the other hand, I try to help my teammates doing UI. Doing front end takes dramatic longer time than we expect. Hence, we have to reschedule the meeting with Su Yuen to Friday instead of Tuesday so that we have more to show on the consultation. During the consultation, we have some trouble building the app so Su Yuen have to wait for us quite some time. During the consultation, Su Yuen gave us a lot of questions about the UX flow of the app. I truly learned on that day the differences between UI and UX. Su Yuen get lost in the app as she did not understand how it work and did not know what to do. I realize a big problem: I have never truly put myself as a fresh user. I understand the app well because I am the app developer, but to the users who have not read anything about the app, it is not intuitive to look at the UI and understand what to do. On today meeting with Bjorn, he also briefly told us on how to study the user use case, follow that and design a UI that make sense to fresh new user. So our next mission is not to implement something that looks cool into the app, but to refine the UI so that the app flow is natural and intuitive.

Jaedye week 10

After two week getting started with Android, I understand the basic workflow as well as simple transition between activities in an Android app. Now comes the interesting story between Activity and Fragment in Android.

When I first started on Android, a lot of tutorial mention about Fragment is the new style but I did not understand the idea of Fragment at that time. Activity is nice, I can make a view and put logic code inside a java class and move around from Activities to Activities, I feel I am fine with it. The need for Fragment arises when I started to implement the Bottom Navigation bar. The problem comes when you want to reuse an element across multiple activity without duplicating code (both logic and view). One example is the Bottom Navigation bar. It doesn’t make sense to just add the code for Navigation bar on every activity, and have it re-rendered in the app. I google and read about this, and I choose to use Fragment. The idea here is that you have one big activity where you put the Toolbar (the top bar) and the Bottom Navigation bar, and everything else is Fragment to hold the content of a specific page in the app. So all the previous pages has already been implemented using Activity, with this approach, I would have to convert all of them into Fragment. But I just leave them like that first, I implement two new pages as Fragment and use the above tactics, hoping to achieve a cleaner app. We shall see how this goes.

The next big thing is I also started to integrating API call to our back end in the Android app using Retrofit library. This takes a while to get things up. We need to create model and use Gson to parse JSON into Java object. And we need to set up retrofit to attach our access-token into API calls for authentication with jwt. After that things went smoothly. I really love Retrofit, highly recommend if you are looking for a library to do API call in Android. With it, making request and parsing response is an ease.

Jaedye week 9

This is our second week in development of Jaedye. I am in charged of creating the log in system using google / facebook for the app. As a newbie to Android app programming, I get confused a lot on the way. With background in Rail, I try to map the Android system as much as I can to Rails.


First, the XML layout of Android has been giving me a lot of headache. Android has a lot of layout: LinearLayout, RelativeLayout, CoordinateLayout and so on. I need to read about them and understand the differences before choosing which one to use. For now I primarily understand and use LinearLayout and RelativeLayout. But that’s not everything, the properties of elements are also very complicated. Sometimes I really hard to just align a button or a text view center because I do not know what property to set and the correct answer varies depends on your root layout. However, coming with an background on HTML and CSS, I feel that XML in Android is cleaner and more structured in many ways (this is just based on my reading so far in two weeks, so it may not be correct XD).

  1. XML tags are completely user defined. This make the use of Android or external library an ease. We can use directly the XML tag defined by that particular library and put properties to customize it.
  2. XML properties are more consistent and reliable than CSS. Because CSS can overwrite each other, looking for the correct CSS of an element can be challenging. However, XML property depends only on the layout that the element resides in, hence it is more deterministic then some way.


Next, let’s make Activity. Activity handles logic parts of the app and is mapped to one layout. The logic is contained in a Java class which subclass AppCompactActivity. Inside the class we override some methods (onCreate, onStart, onStop, onDestroy and so on) which will be triggered by Android when the user interact with the app. The flow is quite clear and easy to understand. Transition between activity using Intent is also very straightforward, and I have no problem using it. What I find challenging about this is the callback object. There are tons of callback methods for different elements, and different elements require you to implement the callback differently. This is not hard thanks to Android Studio, it autocompletes and reminds you everything. However, this make your code look very very messy and hard to maintain. Imagine in onCreate method, you have a callback on a button click, and you pass to that callback an new instance of a newly created class with implementations of various methods. It doesn’t sound so bad. But this is only one button, if we have around 3-4 buttons like this, this is really not readable. For now I have not found the correct way to organize this, I have been using comments to separate different parts of the code that handle different view elements, but still it looks pretty bad. I will find a way to solve this in next week.

This is still the early stage of the app development so there is nothing much to focus on but technical details. When the app is more complete, I will shift my focus more on to design decision.

Save Kitty – taking care of your mind

Bjorn’s idea on an app to take care of our mind posted to me a question: “Are we mentally healthy?” There are numerous app and even gadget who focus on physically health, apple health, apple watch, fitbit watch, etc. But I cannot name any well known app for mental health. Hence, I wish to discuss with Bjorn more about the project.

I go on, form a team (which is also our assignment 3 team because I feel comfortable working with them XD). We contacted Bjorn and met up with him, discussed more in details about the app. During the meeting, we deviates a bit from the original idea he proposed (which includes professional consultants) as we think this business model cannot be built easily. And the final idea is an app to take care of your mind from the angle of productivity.

So how exactly the app take care of your mental health. It will give you reminders and incentives to practice mindfulness. You go to the app, set a timer for yourself and start hatching an egg. Whenever you close the app to open facebook or whatsapp on your phone, you will immediately receive a notification and if you fail to return to the app within a few seconds, your egg will become an egg yolk. But if you successfully gone through the timer, the egg will hatch become a cat, added to your collection (woohoo!). You don’t want to kill an egg, maybe that’s the incentive to keep you from distraction.

We are still considering a lot of changes and modification to make the app greater and more suitable to students. Updating soon.

Let Me Know

We’ve kickstarted our assignment 3: “Let Me Know” app. LMK will let you assign a task to a person, and will notify you when that person has completed his part so you can start on yours.

Our group includes Yuchuan, Derek and Van. Yuchuan and I will be working on the backend of the system. We decided to use Expressjs to provide an API. Derek and Van will be working on the front end of the system using Ionic. However, we encounter one problem. As we are doing an PWA, service worker cannot push notification in the background, which means our coolest features, the notification system, will not work. We overcome this by bringing Telegram into the game. We will make a Telegram Bot to send notification. We also leverage on the integration of Telegram as an authentication method. So now user can register a new account using either Facebook or Telegram or both. And if they have Telegram integration, they will have a Telegram Bot which does many features: you can make an “LMK request”, receive notification through the Telegram Bot.

And here we start. Yuchuan and I first tackles the problem: “How do you authenticate with Telegram”. More update coming soon…