Please help: OpenCV Android Star Feature Detection

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Nope but you could use the JNI support to call C++ samples from android. Look at this tutorial.

But I am restricted to only use android coding

should work from plain java, too, look here

FeatureDetector star = FeatureDetector.create(FeatureDetector.STAR);

Actually I know how to create but I don't understand how to use star.detect() and the description "Detects keypoints in an image (first variant) or image set (second variant)". Example: { I got 2 image, 1 is the "source image" and the other one is "template image" the function will compare the 2 image and see if the feature in "template image" appear in "source image". If it appear, it will return the position of the detected area. } is that what the function do??

sidenote ... how do people choose their nicknames on forums :D?

no, there's no comparison done.

it either collects keypoints for 1 image, or vectors of keypoints for many images.

@PrettyDerp, maybe it's time now, to explain, what you want to do, once you found keypoints.

"to detect some reference colours " - that's pretty blurry.

What I actually need to do is by using StarFeatureDetector, find the the position of the reference colour. In short, I have this image and within the image there is multiple reference colour. I want to detect that specify reference colour in the image using StarFeatureDetector but I do not know how and i can't find any good example to help me

I tried using template matching but it cannot detect the colour position if the image is not vertical or horizontal

each keypoint has a pt member, the location. you could query the img color at that point, but i see no guarantee, that those keypoints will hit your reference color at all (most feature detectors even work on grayscale).

so you mean most feature detector only work if the image is grayscale?