Add pull down to refresh in subscriptions tab

Added the SwipeRefreshLayout in the fragment_subscriptions.xml to
refresh the content when user pulls down.

I keep the when user click in the tab it refresh the feed, because
I don't know which UX do you prefer.

app/src/main/java/com/github/libretube/Subscriptions.kt

@@ -14,6 +14,7 @@ import androidx.preference.PreferenceManager
 import androidx.recyclerview.widget.GridLayoutManager
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
+import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
 import com.github.libretube.adapters.SubscriptionAdapter
 import com.github.libretube.adapters.SubscriptionChannelAdapter
 import com.github.libretube.adapters.TrendingAdapter
@@ -25,6 +26,7 @@ class Subscriptions : Fragment() {
     lateinit var token: String
     var isLoaded = false
     private var subscriptionAdapter: SubscriptionAdapter? =null
+    private var refreshLayout: SwipeRefreshLayout? = null
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         arguments?.let {
@@ -44,8 +46,11 @@ class Subscriptions : Fragment() {
         val sharedPref = context?.getSharedPreferences("token", Context.MODE_PRIVATE)
         token = sharedPref?.getString("token","")!!
         Log.e(TAG,token)
+        refreshLayout = view.findViewById(R.id.sub_refresh)
         if(token!=""){
             view.findViewById<RelativeLayout>(R.id.loginOrRegister).visibility=View.GONE
+            refreshLayout?.isEnabled = true
+
             var progressBar = view.findViewById<ProgressBar>(R.id.sub_progress)
             progressBar.visibility=View.VISIBLE
 
@@ -57,6 +62,11 @@ class Subscriptions : Fragment() {
             feedRecView.layoutManager = GridLayoutManager(view.context, resources.getInteger(R.integer.grid_items))
             fetchFeed(feedRecView, progressBar)
 
+            refreshLayout?.setOnRefreshListener {
+                fetchChannels(channelRecView)
+                fetchFeed(feedRecView, progressBar)
+            }
+
             val scrollView = view.findViewById<ScrollView>(R.id.scrollview_sub)
             scrollView.viewTreeObserver
                 .addOnScrollChangedListener {
@@ -64,11 +74,15 @@ class Subscriptions : Fragment() {
                         == (scrollView.height + scrollView.scrollY)) {
                         //scroll view is at bottom
                         if(isLoaded){
+                            refreshLayout?.isRefreshing = true
                             subscriptionAdapter?.updateItems()
+                            refreshLayout?.isRefreshing = false
                         }
 
                     }
                 }
+        } else {
+            refreshLayout?.isEnabled = false
         }
     }
 
@@ -84,6 +98,8 @@ class Subscriptions : Fragment() {
                 } catch (e: HttpException) {
                     Log.e(TAG, "HttpException, unexpected response")
                     return@launchWhenCreated
+                } finally {
+                    refreshLayout?.isRefreshing = false
                 }
                 if (response.isNotEmpty()){
                     subscriptionAdapter = SubscriptionAdapter(response)
@@ -109,6 +125,8 @@ class Subscriptions : Fragment() {
                 } catch (e: HttpException) {
                     Log.e(TAG, "HttpException, unexpected response")
                     return@launchWhenCreated
+                } finally {
+                    refreshLayout?.isRefreshing = false
                 }
                 if (response.isNotEmpty()){
                     channelRecView?.adapter=SubscriptionChannelAdapter(response.toMutableList())

app/src/main/res/layout/fragment_subscriptions.xml

@@ -4,22 +4,21 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     tools:context=".Subscriptions">
+
     <ProgressBar
         android:id="@+id/sub_progress"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:layout_centerVertical="true"
         android:layout_centerHorizontal="true"
-        android:visibility="gone"
+        android:layout_centerVertical="true"
-        />
+        android:visibility="gone" />
 
     <RelativeLayout
         android:id="@+id/loginOrRegister"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:layout_centerVertical="true"
         android:layout_centerHorizontal="true"
-        >
+        android:layout_centerVertical="true">
 
         <ImageView
             android:id="@+id/boogh"
@@ -40,14 +39,22 @@
             android:textSize="20sp"
             android:textStyle="bold" />
     </RelativeLayout>
+
+    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
+        android:id="@+id/sub_refresh"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
         <ScrollView
             android:id="@+id/scrollview_sub"
             android:layout_width="match_parent"
             android:layout_height="match_parent">
+
             <LinearLayout
                 android:layout_width="match_parent"
-            android:layout_height="match_parent"
+                android:layout_height="wrap_content"
                 android:orientation="vertical">
+
                 <RelativeLayout
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
@@ -59,6 +66,7 @@
                         android:layout_height="wrap_content"
                         android:nestedScrollingEnabled="false" />
                 </RelativeLayout>
+
                 <RelativeLayout
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
@@ -72,4 +80,5 @@
                 </RelativeLayout>
             </LinearLayout>
         </ScrollView>
+    </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
 </RelativeLayout>