Collapse subscriptions filter when scrolling down (#7990)

app/src/main/java/de/danoeh/antennapod/ui/screen/subscriptions/SubscriptionFragment.java

@@ -18,6 +18,8 @@ import androidx.recyclerview.widget.GridLayoutManager;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
 import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
+import com.google.android.material.appbar.AppBarLayout;
+import com.google.android.material.appbar.CollapsingToolbarLayout;
 import com.google.android.material.appbar.MaterialToolbar;
 import com.google.android.material.floatingactionbutton.FloatingActionButton;
 import de.danoeh.antennapod.R;
@@ -83,6 +85,7 @@ public class SubscriptionFragment extends Fragment
     private MaterialToolbar toolbar;
     private SwipeRefreshLayout swipeRefreshLayout;
     private ProgressBar progressBar;
+    private CollapsingToolbarLayout collapsingContainer;
     private boolean displayUpArrow;
 
     private Disposable disposable;
@@ -132,9 +135,11 @@ public class SubscriptionFragment extends Fragment
         }
         refreshToolbarState();
 
+        collapsingContainer = root.findViewById(R.id.collapsing_container);
         subscriptionRecycler = root.findViewById(R.id.subscriptions_grid);
         registerForContextMenu(subscriptionRecycler);
         subscriptionRecycler.addOnScrollListener(new LiftOnScrollListener(root.findViewById(R.id.appbar)));
+        subscriptionRecycler.addOnScrollListener(new LiftOnScrollListener(collapsingContainer));
         subscriptionAdapter = new SubscriptionsRecyclerAdapter((MainActivity) getActivity()) {
             @Override
             public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
@@ -428,12 +433,21 @@ public class SubscriptionFragment extends Fragment
         loadSubscriptionsAndTags();
     }
 
+    private void setCollapsingToolbarFlags(int flags) {
+        AppBarLayout.LayoutParams params = (AppBarLayout.LayoutParams) collapsingContainer.getLayoutParams();
+        params.setScrollFlags(flags);
+        collapsingContainer.setLayoutParams(params);
+    }
+
     @Override
     public void onEndSelectMode() {
         floatingSelectMenu.setVisibility(View.GONE);
         subscriptionAddButton.setVisibility(View.VISIBLE);
         tagsRecycler.setVisibility(tagAdapter.getItemCount() > 1 ? View.VISIBLE : View.GONE);
         updateFilterVisibility();
+        setCollapsingToolbarFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL
+                | AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS
+                | AppBarLayout.LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED);
     }
 
     @Override
@@ -442,6 +456,8 @@ public class SubscriptionFragment extends Fragment
         subscriptionAddButton.setVisibility(View.GONE);
         tagsRecycler.setVisibility(tagAdapter.getItemCount() > 1 ? View.INVISIBLE : View.GONE);
         updateFilterVisibility();
+        setCollapsingToolbarFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL
+                | AppBarLayout.LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED);
     }
 
     public Pair<Integer, Integer> getScrollPosition() {

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

@@ -1,10 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
-<RelativeLayout
+<LinearLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    android:orientation="vertical">
 
     <com.google.android.material.appbar.AppBarLayout
         android:id="@+id/appbar"
@@ -16,15 +17,34 @@
             android:id="@+id/toolbar"
             android:layout_width="match_parent"
             android:layout_height="?attr/actionBarSize"
+            app:layout_collapseMode="pin"
             app:title="@string/subscriptions_label"
             app:navigationContentDescription="@string/toolbar_back_button_content_description"
             app:navigationIcon="?homeAsUpIndicator" />
 
+    </com.google.android.material.appbar.AppBarLayout>
+
+    <androidx.coordinatorlayout.widget.CoordinatorLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <com.google.android.material.appbar.AppBarLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content">
+
+            <com.google.android.material.appbar.CollapsingToolbarLayout
+                android:id="@+id/collapsing_container"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                app:titleEnabled="false"
+                app:contentScrim="#00000000"
+                app:layout_scrollFlags="scroll|snap|enterAlways|exitUntilCollapsed">
+
                 <LinearLayout
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
-            android:layout_marginTop="-16dp"
+                    android:orientation="vertical"
-            android:orientation="vertical">
+                    app:layout_collapseMode="pin">
 
                     <androidx.recyclerview.widget.RecyclerView
                         android:id="@+id/tags_recycler"
@@ -34,6 +54,7 @@
                         android:clipToPadding="false"
                         android:visibility="visible"
                         tools:orientation="horizontal"
+                        tools:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
                         tools:listitem="@layout/item_tag_chip" />
 
                     <TextView
@@ -47,13 +68,15 @@
 
                 </LinearLayout>
 
+            </com.google.android.material.appbar.CollapsingToolbarLayout>
+
         </com.google.android.material.appbar.AppBarLayout>
 
         <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
             android:id="@+id/swipeRefresh"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
-        android:layout_below="@id/appbar">
+            app:layout_behavior="@string/appbar_scrolling_view_behavior">
 
             <androidx.recyclerview.widget.RecyclerView
                 android:id="@+id/subscriptions_grid"
@@ -71,7 +94,7 @@
             android:id="@+id/progressBar"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-        android:layout_centerInParent="true"
+            android:layout_gravity="center"
             android:indeterminateOnly="true"
             android:visibility="visible" />
 
@@ -80,9 +103,7 @@
             android:layout_width="56dp"
             android:layout_height="56dp"
             android:layout_margin="16dp"
-        android:layout_alignParentRight="true"
+            android:layout_gravity="bottom|end"
-        android:layout_alignParentEnd="true"
-        android:layout_alignParentBottom="true"
             android:contentDescription="@string/add_feed_label"
             app:srcCompat="@drawable/ic_add" />
 
@@ -90,6 +111,8 @@
             android:id="@+id/floatingSelectMenu"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-        android:layout_alignParentBottom="true" />
+            android:layout_gravity="bottom" />
 
-</RelativeLayout>
+    </androidx.coordinatorlayout.widget.CoordinatorLayout>
+
+</LinearLayout>