android: Show a hint when the gamelist is empty

src/android/app/src/main/java/org/citra/citra_emu/ui/platform/PlatformGamesFragment.java

@@ -5,6 +5,7 @@ import android.os.Bundle;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.TextView;
 
 import androidx.core.content.ContextCompat;
 import androidx.fragment.app.Fragment;
@@ -22,6 +23,7 @@ public final class PlatformGamesFragment extends Fragment implements PlatformGam
 
     private GameAdapter mAdapter;
     private RecyclerView mRecyclerView;
+    private TextView mTextView;
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
@@ -62,6 +64,7 @@ public final class PlatformGamesFragment extends Fragment implements PlatformGam
     @Override
     public void refresh() {
         mPresenter.refresh();
+        updateTextView();
     }
 
     @Override
@@ -69,9 +72,15 @@ public final class PlatformGamesFragment extends Fragment implements PlatformGam
         if (mAdapter != null) {
             mAdapter.swapCursor(games);
         }
+        updateTextView();
+    }
+
+    private void updateTextView() {
+        mTextView.setVisibility(mAdapter.getItemCount() == 0 ? View.VISIBLE : View.GONE);
     }
 
     private void findViews(View root) {
         mRecyclerView = root.findViewById(R.id.grid_games);
+        mTextView = root.findViewById(R.id.gamelist_empty_text);
     }
 }

src/android/app/src/main/res/layout/fragment_grid.xml

@@ -9,13 +9,25 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content">
 
-        <androidx.recyclerview.widget.RecyclerView
-            android:id="@+id/grid_games"
+        <RelativeLayout
             android:layout_width="match_parent"
-            android:layout_height="match_parent"
-            android:layout_marginLeft="@dimen/activity_horizontal_margin"
-            android:layout_marginRight="@dimen/activity_horizontal_margin"
-            tools:listitem="@layout/card_game"/>
+            android:layout_height="match_parent">
+
+            <TextView
+                android:id="@+id/gamelist_empty_text"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:text="@string/empty_gamelist"
+                android:visibility="gone"
+                android:textSize="18sp"
+                android:gravity="center"/>
+
+            <androidx.recyclerview.widget.RecyclerView
+                android:id="@+id/grid_games"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                tools:listitem="@layout/card_game" />
+        </RelativeLayout>
 
     </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
 </FrameLayout>

src/android/app/src/main/res/values/strings.xml

@@ -125,6 +125,7 @@
     <string name="external_storage_not_mounted">The external storage needs to be available in order to use Citra</string>
 
     <string name="select_dir">Select This Directory</string>
+    <string name="empty_gamelist">No files were found or no game directory has been selected yet.</string>
 
     <!-- Software Keyboard -->
     <string name="software_keyboard">Software Keyboard</string>