Merge pull request #3582 from ByteHamster/empty-view-subscriptions

Added empty view to subscription list

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

@@ -42,6 +42,7 @@ import de.danoeh.antennapod.core.util.IntentUtils;
 import de.danoeh.antennapod.core.util.download.AutoUpdateManager;
 import de.danoeh.antennapod.dialog.RenameFeedDialog;
 import de.danoeh.antennapod.menuhandler.MenuItemUtils;
+import de.danoeh.antennapod.view.EmptyViewHandler;
 import io.reactivex.Observable;
 import io.reactivex.android.schedulers.AndroidSchedulers;
 import io.reactivex.disposables.Disposable;
@@ -63,6 +64,7 @@ public class SubscriptionFragment extends Fragment {
     private DBReader.NavDrawerData navDrawerData;
     private SubscriptionsAdapter subscriptionAdapter;
     private FloatingActionButton subscriptionAddButton;
+    private EmptyViewHandler emptyView;
 
     private int mPosition = -1;
     private boolean isUpdatingFeeds = false;
@@ -87,6 +89,7 @@ public class SubscriptionFragment extends Fragment {
         subscriptionGridLayout.setNumColumns(prefs.getInt(PREF_NUM_COLUMNS, 3));
         registerForContextMenu(subscriptionGridLayout);
         subscriptionAddButton = root.findViewById(R.id.subscriptions_add);
+        setupEmptyView();
         return root;
     }
 
@@ -136,9 +139,18 @@ public class SubscriptionFragment extends Fragment {
         getActivity().invalidateOptionsMenu();
     }
 
+    private void setupEmptyView() {
+        emptyView = new EmptyViewHandler(getContext());
+        emptyView.setIcon(R.attr.ic_folder);
+        emptyView.setTitle(R.string.no_subscriptions_head_label);
+        emptyView.setMessage(R.string.no_subscriptions_label);
+        emptyView.attachToListView(subscriptionGridLayout);
+    }
+
     @Override
     public void onActivityCreated(Bundle savedInstanceState) {
         super.onActivityCreated(savedInstanceState);
+
         subscriptionAdapter = new SubscriptionsAdapter((MainActivity) getActivity(), itemAccess);
         subscriptionGridLayout.setAdapter(subscriptionAdapter);
         subscriptionGridLayout.setOnItemClickListener(subscriptionAdapter);
@@ -174,12 +186,14 @@ public class SubscriptionFragment extends Fragment {
         if(disposable != null) {
             disposable.dispose();
         }
+        emptyView.hide();
         disposable = Observable.fromCallable(DBReader::getNavDrawerData)
                 .subscribeOn(Schedulers.io())
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe(result -> {
                     navDrawerData = result;
                     subscriptionAdapter.notifyDataSetChanged();
+                    emptyView.updateVisibility();
                 }, error -> Log.e(TAG, Log.getStackTraceString(error)));
     }
 

app/src/main/java/de/danoeh/antennapod/view/EmptyViewHandler.java

@@ -2,6 +2,7 @@ package de.danoeh.antennapod.view;
 
 import android.content.Context;
 import android.graphics.drawable.Drawable;
+import android.widget.AbsListView;
 import androidx.annotation.AttrRes;
 import androidx.core.content.ContextCompat;
 import androidx.recyclerview.widget.RecyclerView;
@@ -9,7 +10,6 @@ import android.util.TypedValue;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ImageView;
-import android.widget.ListView;
 import android.widget.RelativeLayout;
 import android.widget.TextView;
 
@@ -54,28 +54,31 @@ public class EmptyViewHandler {
         emptyView.setVisibility(View.GONE);
     }
 
-    public void attachToListView(ListView listView) {
+    public void attachToListView(AbsListView listView) {
         if (layoutAdded) {
-            throw new IllegalStateException("Can not attach to ListView multiple times");
+            throw new IllegalStateException("Can not attach EmptyView multiple times");
         }
+        addToParentView(listView);
         layoutAdded = true;
-        ((ViewGroup) listView.getParent()).addView(emptyView);
         listView.setEmptyView(emptyView);
     }
 
     public void attachToRecyclerView(RecyclerView recyclerView) {
         if (layoutAdded) {
-            throw new IllegalStateException("Can not attach to ListView multiple times");
+            throw new IllegalStateException("Can not attach EmptyView multiple times");
         }
+        addToParentView(recyclerView);
         layoutAdded = true;
         this.recyclerView = recyclerView;
-        ViewGroup parent = ((ViewGroup) recyclerView.getParent());
-        parent.addView(emptyView);
         updateAdapter(recyclerView.getAdapter());
+    }
 
+    private void addToParentView(View view) {
+        ViewGroup parent = ((ViewGroup) view.getParent());
+        parent.addView(emptyView);
         if (parent instanceof RelativeLayout) {
             RelativeLayout.LayoutParams layoutParams =
-                    (RelativeLayout.LayoutParams)emptyView.getLayoutParams();
+                    (RelativeLayout.LayoutParams) emptyView.getLayoutParams();
             layoutParams.addRule(RelativeLayout.CENTER_IN_PARENT, RelativeLayout.TRUE);
             emptyView.setLayoutParams(layoutParams);
         }
@@ -99,7 +102,7 @@ public class EmptyViewHandler {
         }
     };
 
-    private void updateVisibility() {
+    public void updateVisibility() {
         boolean empty;
         if (adapter == null) {
             empty = true;

core/src/main/res/values/strings.xml

@@ -325,6 +325,8 @@
     <string name="no_fav_episodes_label">You can add episodes to the favorites by long-pressing them.</string>
     <string name="no_chapters_head_label">No chapters</string>
     <string name="no_chapters_label">This episode has no chapters.</string>
+    <string name="no_subscriptions_head_label">No subscriptions</string>
+    <string name="no_subscriptions_label">To subscribe to a podcast, press the plus icon below.</string>
 
     <!-- Preferences -->
     <string name="storage_pref">Storage</string>