iTunes 11-style color matching code for Android

In trying to address issue #17, I've updated the build scripts to work with the newer version of gradle build tools. This may or may not fix the issue, as I didn't push the build out to a repository and see if I could pull it fine as a dependency.

Hi Michael,

I'm particularly interested in seeing the minSdKVersion change go in, since I have an app (https://github.com/nikclayton/android-squeezer) that supports SDK 7 and up and I'd like to use the ColorArt library with it. As far as I can tell there's nothing in ColorArt that uses any higher SDK features, so this should be safe.

The other changes are just straightforward cleanups.

Thanks, Nik

I could trigger an NPE in findTextColors(), line 164

            } else if (mSecondaryColor == null) {
NPE HERE  =>   if (!isDistinctColor(mPrimaryColor, currentColor) ||        
                        !isContrastingColor(currentColor, mBackgroundColor)) {
                    continue;

mPrimaryColor can be null, hence the NPE since isDistinctColor() expects an int as first parameter.

.. If you do so, your markdown starts to show up properly) Cooooooool library! =)

Also, I'm interested, do you use some kind of random heuristics points or just scan the whole bitmap to calculate most dominant colors? (so that the algorithm complexity is O(n^2) ?)

Manifest merger failed : Attribute application@allowBackup value=(false) from AndroidManifest.xml:28:9-36 is also present at [org.michaelevans.colorart:library:0.0.3] AndroidManifest.xml:12:9-35 value=(true). Suggestion: add 'tools:replace="android:allowBackup"' to element at AndroidManifest.xml:23:5-58:19 to override.

It seems that the algorithm you're using has a tough time picking out reds. I'm using your library to pick out colors for albums and here is the first example of something going not as expected.

The background color is pretty good. It could be a little darker to reflect that the album background isn't pure white. My main issue is with the primary color here. There are pretty much only two colors on the album, white and red. The red doesn't show up in any of the colors, be it primary, secondary, or detail color. In all of these examples, the colors are as follows:

• Background color is from ColorArt.getBackgroundColor()
• Song title is ColorArt.getPrimaryColor()
• Artist is ColorArt.getSecondaryColor()
• The time played and time left textviews are ColorArt.getPrimaryColor()
• The progress bar on the seekbar is ColorArt.getSecondaryColor()
• The draggable thumb on the seekbar is ColorArt.getPrimaryColor()

Here's another example

The background color is a dark brown/green. Ideally it would be a red or a white as those are the two most dominant colors in the image and they also touch the borders.

Yet another example:

For this album cover, the background color is good. What's weird is that the primary color is pink. There isn't really pink on the album cover, though there is a bit of red in the reflection of the sunglasses. It would make more sense for the primary color to be a black, white or brown.

Moar example:

There should be red/magenta as the primary color.

Last example:

Nix the purple/lilac. Use the reds/oranges/light blues/blacks or whites. The background color should definitely be white here as that is also the background color of the album. Red or orange would work as well.

EDIT:

I found some more weird occurrences. In the following image, there shouldn't be any light blue.

In the following image, there should not be pink.

In the future, similar to Chris Banes's ColorFinder, it would be nice to have a secondary text color which is either black or white depending on the brightness of the background color to ensure high visibility/readability.

java.lang.IllegalArgumentException: Comparison method violates its general contract! at java.util.ComparableTimSort.mergeLo(ComparableTimSort.java:710) at java.util.ComparableTimSort.mergeAt(ComparableTimSort.java:447) at java.util.ComparableTimSort.mergeCollapse(ComparableTimSort.java:372) at java.util.ComparableTimSort.sort(ComparableTimSort.java:178) at java.util.ComparableTimSort.sort(ComparableTimSort.java:142) at java.util.Arrays.sort(Arrays.java:1973) at java.util.Collections.sort(Collections.java:1867) at org.michaelevans.colorart.library.ColorArt.findTextColors(ColorArt.java:154) at org.michaelevans.colorart.library.ColorArt.analyzeImage(ColorArt.java:49) at org.michaelevans.colorart.library.ColorArt.(ColorArt.java:44)