ios2droid

A simple Perl script to port iOS images to the appropriate Android density buckets. I use this in my work with Xamarin, but it could certainly be used in other contexts.

Porting iOS images to Android can be time-consuming. This script -- inspired in part by ios2android by Jason Adams -- aims to automate the process as much as possible.

Prerequisites

ImageMagick

On Mac OS X, the easiest way to install ImageMagick is with Homebrew:

brew install imagemagick

(Sorry, I haven't tried getting this to work on Windows.)

Usage

Put the ios2droid script somewhere in your path.

Go to a terminal prompt and cd to the top-level directory of your project. If you're using Xamarin this should be where your .sln file is. There should be an iOS and a Droid directory underneath.

From the terminal prompt, run using either one of these command lines:

ios2droid test
ios2droid

Using the test argument will show what it plans to do -- nothing will be modified. Without test it will do the actual copying.

Sample output

./iOS/Resources/bg.jpg                  -->  ./Droid/Resources/drawable/bg.jpg

./iOS/Resources/btn_circle_info.png     -->  ./Droid/Resources/drawable/btn_circle_info.png
./iOS/Resources/[email protected]  -->  ./Droid/Resources/drawable-hdpi/btn_circle_info.png (resize 75%)
./iOS/Resources/[email protected]  -->  ./Droid/Resources/drawable-xhdpi/btn_circle_info.png
./iOS/Resources/[email protected]  -->  ./Droid/Resources/drawable-xxhdpi/btn_circle_info.png

./iOS/Resources/btn_locked.png          -->  ./Droid/Resources/drawable/btn_locked.png
./iOS/Resources/[email protected]       -->  ./Droid/Resources/drawable-hdpi/btn_locked.png (resize 75%)
./iOS/Resources/[email protected]       -->  ./Droid/Resources/drawable-xhdpi/btn_locked.png
./iOS/Resources/[email protected]       -->  ./Droid/Resources/drawable-xxhdpi/btn_locked.png

./iOS/Resources/btn_minus.png           -->  ./Droid/Resources/drawable/btn_minus.png
./iOS/Resources/[email protected]        -->  ./Droid/Resources/drawable-hdpi/btn_minus.png (resize 75%)
./iOS/Resources/[email protected]        -->  ./Droid/Resources/drawable-xhdpi/btn_minus.png
./iOS/Resources/[email protected]        -->  ./Droid/Resources/drawable-xxhdpi/btn_minus.png

./iOS/Resources/btn_plus.png            -->  ./Droid/Resources/drawable/btn_plus.png
./iOS/Resources/[email protected]         -->  ./Droid/Resources/drawable-hdpi/btn_plus.png (resize 50%)
./iOS/Resources/[email protected]         -->  ./Droid/Resources/drawable-xhdpi/btn_plus.png (resize 67%)
./iOS/Resources/[email protected]         -->  ./Droid/Resources/drawable-xxhdpi/btn_plus.png

./iOS/Resources/btn_unlocked.png        -->  ./Droid/Resources/drawable/btn_unlocked.png
./iOS/Resources/[email protected]     -->  ./Droid/Resources/drawable-hdpi/btn_unlocked.png (resize 75%)
./iOS/Resources/[email protected]     -->  ./Droid/Resources/drawable-xhdpi/btn_unlocked.png
./iOS/Resources/[email protected]     -->  ./Droid/Resources/drawable-xxhdpi/btn_unlocked.png

Details

The script looks for two sub-directories (regardless of case):

• "ios"
• "android" or "droid"

Beneath each sub-directory there must be a "Resources" directory (case must match).

It gathers a list of all jpg, jpeg, and png files in the iOS/Resources directory that do not contain "@" or begin with "icon-".

For each of these image files it finds, it tries to put a new image into each of the following Android directories:

drawable (1x, or ~160 dpi)
Copies the image here.

drawable-hdpi (1.5x, or ~240 dpi)
If there's a @2x version of the image, the script resizes it to 75%, removing the @2x.
If there's a @3x version of the image, the script resizes it to 50%, removing the @3x.

drawable-xhdpi (2x, or ~320 dpi)
If there's a @2x version of the image, the script copies it, removing the @2x.
If there's a @3x version of the image, the script resizes it to 67%, removing the @3x.

drawable-xxhdpi (3x, or ~480 dpi)
If there's a @3x version of the image, the script copies it, removing the @3x.
If there's a @2x version of the image, the script resizes it to 150%, removing the @2x.

All images in the iOS directory are left untouched.

The script does not deal with @4x images on the iOS side, nor any of the other possible drawable-???? directories on the Android side.

License

The MIT License (MIT)

Copyright (c) 2016 Michael Lorenz

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.