Implement activity of SNS Feed(Post)

[lijm1358]

This revision includes

Changes

1. Add new activity&layout to display SNS feed from server (SnsFeedActivity)

2. Add interfaces, data classses for SNS related communication (API/ServerClient, Model/PostFeedItem)

3. Add new retrofit2 instance object (API/ServerPostAPI)

4. Add ViewPager, Recycler layout&adapter to show comments, images of post (image_viewpager.xml, commnet_recycler.xml, ImageSliderAdapter, CommentRecyclerAdapter)

5. Add dependencies for processing request and images

Documents

• https://square.github.io/retrofit/
• https://github.com/bumptech/glide

[Snowapril]

Suggested change

	class SnsFeedInformation(postInfo: PostFeedItem, baseurl : String) {
	val postId: Int = postInfo.postID
	val writerName: String = postInfo.writer.username
	val writerImage: String = baseurl + postInfo.writer.picture
	val postcontent: String = postInfo.contents
	val postTime: String = postInfo.postTime.split(".")[0].replace("T", " ")
	val postLat: Double = postInfo.location.lat
	val postLong: Double = postInfo.location.lng
	val liker = postInfo.like
	var likerCount: Int = 0
	}
	/** class of informations of sns feed */
	data class SnsFeedInformation(
	val postId: Int,
	val writerName: String,
	val writerImage: String,
	val postcontent: String,
	val postTime: String,
	val postLat: Double,
	val postLong: Double,
	val liker: List<Like>,
	var likerCount: Int,
	) {
	constructor(postInfo: PostFeedItem, baseurl : String) : this(
	postInfo.postID,
	postInfo.writer.username,
	baseurl + postInfo.writer.picture,
	postInfo.contents,
	postInfo.postTime.split(".")[0].replace("T", " "),
	postInfo.location.lat,
	postInfo.location.lng,
	postInfo.like,
	0,
	)
	}

This kind of class have an advantage when declare it as a data class, as it kvm automatically add equals,
hashCode, etc.. Although it may seems little bit more verbose, I think this is a more kotlinic way.

[lijm1358]

Thanks for your suggestion, I'll commit this right away!

[Snowapril]

LGTM! Applying above my suggestion is up to you .You do not have to change it in this PR