Implement a FAB to add podcast on the Subscriptions screen

Fixes #3475

app/src/main/java/de/danoeh/antennapod/adapter/SubscriptionsAdapter.java

@@ -30,7 +30,6 @@ public class SubscriptionsAdapter extends BaseAdapter implements AdapterView.OnI
     public static final Object ADD_ITEM_OBJ = new Object();
 
     /** the position in the view that holds the add item; 0 is the first, -1 is the last position */
-    private static final int ADD_POSITION = -1;
     private static final String TAG = "SubscriptionsAdapter";
 
     private final WeakReference<MainActivity> mainActivityRef;
@@ -41,28 +40,14 @@ public class SubscriptionsAdapter extends BaseAdapter implements AdapterView.OnI
         this.itemAccess = itemAccess;
     }
 
-    private int getAddTilePosition() {
-        if(ADD_POSITION < 0) {
-            return ADD_POSITION + getCount();
-        }
-        return ADD_POSITION;
-    }
-
-    private int getAdjustedPosition(int origPosition) {
-        return origPosition < getAddTilePosition() ? origPosition : origPosition - 1;
-    }
-
     @Override
     public int getCount() {
-        return 1 + itemAccess.getCount();
+        return itemAccess.getCount();
     }
 
     @Override
     public Object getItem(int position) {
-        if (position == getAddTilePosition()) {
+        return itemAccess.getItem(position);
-            return ADD_ITEM_OBJ;
-        }
-        return itemAccess.getItem(getAdjustedPosition(position));
     }
 
     @Override
@@ -72,10 +57,7 @@ public class SubscriptionsAdapter extends BaseAdapter implements AdapterView.OnI
 
     @Override
     public long getItemId(int position) {
-        if (position == getAddTilePosition()) {
+        return itemAccess.getItem(position).getId();
-            return 0;
-        }
-        return itemAccess.getItem(getAdjustedPosition(position)).getId();
     }
 
     @Override
@@ -98,20 +80,6 @@ public class SubscriptionsAdapter extends BaseAdapter implements AdapterView.OnI
             holder = (Holder) convertView.getTag();
         }
 
-        if (position == getAddTilePosition()) {
-            holder.feedTitle.setText("{md-add 500%}\n\n" + mainActivityRef.get().getString(R.string.add_feed_label));
-                    holder.feedTitle.setVisibility(View.VISIBLE);
-            // prevent any accidental re-use of old values (not sure how that would happen...)
-            holder.count.setPrimaryText("");
-            // make it go away, we don't need it for add feed
-            holder.count.setVisibility(View.INVISIBLE);
-
-            // when this holder is reused, we could else end up with a cover image
-            Glide.with(mainActivityRef.get()).clear(holder.imageView);
-
-            return convertView;
-        }
-
         final Feed feed = (Feed) getItem(position);
         if (feed == null) return null;
 
@@ -137,13 +105,9 @@ public class SubscriptionsAdapter extends BaseAdapter implements AdapterView.OnI
 
     @Override
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
-        if (position == getAddTilePosition()) {
-            mainActivityRef.get().loadChildFragment(new AddFeedFragment());
-        } else {
         Fragment fragment = FeedItemlistFragment.newInstance(getItemId(position));
         mainActivityRef.get().loadChildFragment(fragment);
     }
-    }
 
     static class Holder {
         public TextView feedTitle;

app/src/main/java/de/danoeh/antennapod/fragment/SubscriptionFragment.java

@@ -18,6 +18,8 @@ import android.view.ViewGroup;
 import android.widget.AdapterView;
 import android.widget.GridView;
 
+import com.google.android.material.floatingactionbutton.FloatingActionButton;
+
 import java.util.concurrent.Callable;
 
 import de.danoeh.antennapod.R;
@@ -62,6 +64,7 @@ public class SubscriptionFragment extends Fragment {
     private GridView subscriptionGridLayout;
     private DBReader.NavDrawerData navDrawerData;
     private SubscriptionsAdapter subscriptionAdapter;
+    private FloatingActionButton subscriptionAddButton;
 
     private int mPosition = -1;
     private boolean isUpdatingFeeds = false;
@@ -85,6 +88,7 @@ public class SubscriptionFragment extends Fragment {
         subscriptionGridLayout = root.findViewById(R.id.subscriptions_grid);
         subscriptionGridLayout.setNumColumns(prefs.getInt(PREF_NUM_COLUMNS, 3));
         registerForContextMenu(subscriptionGridLayout);
+        subscriptionAddButton = root.findViewById(R.id.subscriptions_add);
         return root;
     }
 
@@ -141,6 +145,12 @@ public class SubscriptionFragment extends Fragment {
         subscriptionGridLayout.setAdapter(subscriptionAdapter);
         subscriptionGridLayout.setOnItemClickListener(subscriptionAdapter);
 
+        subscriptionAddButton.setOnClickListener(view -> {
+            if (getActivity() instanceof MainActivity) {
+                ((MainActivity) getActivity()).loadChildFragment(new AddFeedFragment());
+            }
+        });
+
         if (getActivity() instanceof MainActivity) {
             ((MainActivity) getActivity()).getSupportActionBar().setTitle(R.string.subscriptions_label);
         }

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

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:orientation="vertical"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
@@ -11,6 +11,18 @@
       android:horizontalSpacing="2dp"
       android:verticalSpacing="2dp"
       android:layout_height="match_parent"
-      android:layout_gravity="center_horizontal">
+      android:layout_gravity="center_horizontal"
+      android:paddingBottom="88dp"
+      android:clipToPadding="false">
   </GridView>
-</LinearLayout>
+    
+    <com.google.android.material.floatingactionbutton.FloatingActionButton
+            android:id="@+id/subscriptions_add"
+            android:layout_width="56dp"
+            android:layout_height="56dp"
+            android:layout_margin="16dp"
+            android:layout_gravity="bottom|end"
+            android:contentDescription="@string/add_feed_label"
+            android:src="@drawable/ic_add_white_24dp"
+        />
+</FrameLayout>