Fix sum bugs.

Author: evtushenko-bogdan

app/src/main/java/com/bogdan/codeforceswatcher/adapter/UserAdapter.kt

@@ -29,7 +29,7 @@ class UserAdapter(private var items: List<User>, private val ctx: Context) : Rec
     }
 
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
-        return ViewHolder(LayoutInflater.from(ctx).inflate(R.layout.users_list_view, parent, false), ctx, items)
+        return ViewHolder(LayoutInflater.from(ctx).inflate(R.layout.users_list_view, parent, false))
     }
 
     override fun onBindViewHolder(holder: ViewHolder, position: Int) {
@@ -72,6 +72,10 @@ class UserAdapter(private var items: List<User>, private val ctx: Context) : Rec
             holder.ivDelta.setImageResource(0)
             holder.tvRatingChange.text = null
         }
+
+        holder.itemView.setOnClickListener {
+            ctx.startActivity(TryActivity.newIntent(ctx, user.id))
+        }
     }
 
     private fun getDateTime(seconds: Long): String {
@@ -94,20 +98,14 @@ class UserAdapter(private var items: List<User>, private val ctx: Context) : Rec
         }
     }
 
-    class ViewHolder(view: View, ctx: Context, items: List<User>) : RecyclerView.ViewHolder(view) {
+    class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {
 
         val tvHandle: TextView = view.tvHandle
         val tvRating: TextView = view.tvRating
         val tvLastRatingUpdate: TextView = view.tvLastRatingUpdate
         val tvRatingChange: TextView = view.tvRatingChange
         val ivDelta: ImageView = view.ivDelta
 
-        init {
-            view.setOnClickListener {
-                ctx.startActivity(TryActivity.newIntent(ctx, items[adapterPosition].id))
-            }
-        }
-
     }
 
 }

app/src/main/java/com/bogdan/codeforceswatcher/fragment/UsersFragment.kt

@@ -27,6 +27,7 @@ class UsersFragment : android.support.v4.app.Fragment(), SwipeRefreshLayout.OnRe
     private var counterIcon: Int = 0
     private lateinit var spSort: AppCompatSpinner
     private var prefs = Prefs.get()
+    private var itemsOnScreen = 0
 
     override fun onRefresh() {
         UserLoader.loadUsers(shouldDisplayErrors = true) {
@@ -89,7 +90,18 @@ class UsersFragment : android.support.v4.app.Fragment(), SwipeRefreshLayout.OnRe
 
         val liveData = CwApp.app.userDao.getAllLive()
         liveData.observe(this, Observer<List<User>> { userList ->
-            userList?.let { usersList -> updateList(usersList) }
+            userList?.let { usersList ->
+                updateList(usersList)
+                val firstVisiblePosition = (recyclerView.layoutManager as LinearLayoutManager)
+                        .findFirstVisibleItemPosition()
+                val lastVisiblePosition = (recyclerView.layoutManager as LinearLayoutManager)
+                        .findLastVisibleItemPosition()
+                if (lastVisiblePosition - firstVisiblePosition > itemsOnScreen) {
+                    itemsOnScreen = lastVisiblePosition - firstVisiblePosition
+                } else {
+                    fab.show()
+                }
+            }
         })
     }