Sample Chat UI

Simple task from company - First Online Solution. Just simple UI demonstrate chat.
Information below what should be done to optimize the workpiece.

/** Create special ViewHolder for image to minimize device resource!
* TODO: Change function and create special ImageHolder!
* */

/** Use function to update and calculate time difference
* TODO: Calculate time difference
* */

/** Add new portion to messages list using SwipeToRefresh
* TODO: Realize SwipeToRefresh
* */

/** Simulate simple progress and remove freezing from setting Drawable
* TODO: Simulate progress and remove freezing
* */

These are the main moments which, is not currently implemented,
but they are essential. Other moments are unimportant, such as
creating popup menus, animations and other.