app

Using Scala with Java Swing classes is pretty seamless

If you ever wanted to use Scala with Java Swing classes (like JFrame, JTextArea, JScrollPane, etc.), the process is pretty seamless. Here’s an example of a simple Scala/Swing application where I show a text area in a JFrame:

Android source code to show a popup dialog with a text field alvin August 28, 2017 - 6:20pm

I am working on a way to rapidly mock up Android applications using Android Studio, i.e., to rapidly prototype Android applications on the fly, and little snippets of code help to make this happen. For instance, this snippet of code shows how to show a popup dialog to prompt a user to enter information into a text field:

MacOS screen annotation/presentation software

I was going to write a little application to let me annotate my MacOS screen during presentations, but the Ink2Go product looks like it does exactly what I was thinking. As I’m creating a video presentation, such as when showing how to write some Scala or Android code, I want to be able to draw on the screen, such as writing text, arrows, circles, and boxes to highlight parts of the screen. Ink2Go looks like what I want.

The macOS application signing process doesn’t sign all files

I was surprised to learn that when you sign a macOS application, the signing process doesn’t sign every file under the .app application directory. Here’s a quote from the Apple developer docs:

“Your app’s executable code is protected by its signature because the signature becomes invalid if any of the executable code in the app bundle changes. Note that resources such as images and nib files aren’t signed; therefore, a change to these files doesn’t invalidate the signature.”

Getting a Mac/Java app ready for Apple’s Mac App Store

Over the last two days I’ve gotten a Mac/Java app ready for Apple’s Mac App Store, including bundling the application as a macOS “.app” application bundle, and signing it so it can be submitted to the Store.

A relatively quick look at my browser history shows that I needed to hit over 260 URLs to get that done. As a wise professor once told me, “Keep learning, keep learning.”

How to build a macOS application from a Java Jar file

Table of Contents1 - Background2 - Requirements3 - Building your application4 - Note 1: Font smoothing5 - Note 2: Setting the “application category”6 - The Mac/Java AppBundler7 - More information8 - Summary

In this article I’ll show how to build a macOS application from a Java Jar file. I tested this with Java 1.8 on macOS 10.12.5 (Sierra) on June 29, 2017.

Three assumptions in this process are: