It’s been a little bit over three years since I joined Traveloka as Android engineer. Since then the app has been through 35 minor releases, 25 major releases, 2 major architecture changes, and 1 rewrite from scratch. From having only 3 products in 2015, it now has more than 20…

When you’re at the beginning of apps development. You create a few pages with few data. Then you see it compiles quickly. Not even 20 seconds needed. You continue to build the apps. More activities, more fragments. One year passed, two year passed. You hit the 65k method limit. Going…

There are few times when I want (or need) to debug my apps over wifi. The most likely reason is that my USB cable is being used to charge my other device. Or when I forgot to bring my USB cable when I go to work. The other reason when…

A common mistake for Android developers is to put all the code inside Activity or Fragment. A lot of tutorials create an “MVC” pattern where the View is the XML and the Controller is Activity/Fragment. If anything, they are the V part of MVP, MVC or MVVM Activity or Fragment…

Handling a regular RecyclerView.Adapter with multiple view types can be difficult. The class will be full of code which difficult to manage when we want to add more type to the adapter. It even may become spaghetti code. Here’s one example of adapter that handles 2 types: public class MyAdapter…

When I refactor some code, I found myself in need to copy and paste a lot of things. Whether it’s adding a field that is needed in many classes. Putting a method call in many activities. Or just moving some code around. For example, I’m adding a dependencies to my…

One For All, All For One — Google provides a lot of things as a library that we can use so we don’t have to reinvent the wheel. This is the common way to add those dependencies in the build.gradle: compile 'com.android.support:design:25.2.0' compile 'com.android.support:appcompat-v7:25.2.0' compile 'com.android.support:cardview-v7:25.2.0' While there’s nothing wrong with this approach, it can become a…

Keep It Small, Keep It Secret — By default, ProGuard minification is turned off so your APK will contain unused method/class/field. And they will be pretty easy to read with help from simple tools. I have a simple project with MainActivity, FamilyData and FamilyMember. But there’s no reference made to the last two. I run the ./gradlew…

In a classic Master-Detail pattern, when one of the items is selected then the MainActivity will send an Intent to launch DetailActivity with some information that is required in DetailActivity. It may be as little as an id of the selected items, but may become much complicated with the DetailActivity…