Showing posts from January, 2019

downloading folders from google drive.

I wanted to download some course material on RL shared by the author via Google drive using the command line.  I got a bunch of stuff using wget a folder in google drive was a challenge. I looked it up in SO which gave me a hint but no solution. I installed gdown using pip and then used: gdown --folder --continue if there are more than 50 files you need to use --remaining-ok and only get the first 50. In such a case its best to download using the folder using the UI and decompress locally. Decompressing from the command line created errors related to unicode but using the mac UI I decompressed without a glitch.

Android Coding Conundrums 1 Fragment Constructors

While researching using the factory design pattern for  fragment creation I couldn't help but notice how that fragment creation is a long term source of bugs. Why is fragment creation error prone? Perhaps because the API for fragment has been changed so frequently that so much of the advice is dated. In the real world fragment is deprecated in favour of a decedent in the app support library but that has been deprecated as well in-favour of androidX support libraries.  Perhaps it is because many newcomers to Android are Java developers who follow the Java idiom of constructor overloading to pass parameters at creation for use in Activity.onCreate(). However, this is not a good idea it is an example of bug pattern. Using a constructor will usually appear to work fine until Android destroys the activity and looks for a default constructor. If there isn't one the app crashes with a runtime exception . This is because behind the scenes the default constructor is called ra

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