Android: Generate placeholder covers

android/app/src/main/java/com/github/stenzek/duckstation/GameGridFragment.java

@@ -1,7 +1,5 @@
 package com.github.stenzek.duckstation;
 
-import android.content.Context;
-import android.content.res.Configuration;
 import android.os.AsyncTask;
 import android.os.Bundle;
 import android.util.TypedValue;
@@ -17,16 +15,13 @@ import androidx.annotation.Nullable;
 import androidx.appcompat.widget.PopupMenu;
 import androidx.core.content.ContextCompat;
 import androidx.fragment.app.Fragment;
-import androidx.recyclerview.widget.DividerItemDecoration;
-import androidx.recyclerview.widget.GridLayoutManager;
-import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
 
 public class GameGridFragment extends Fragment implements GameList.OnRefreshListener {
     private static final int SPACING_DIPS = 25;
     private static final int WIDTH_DIPS = 160;
 
-    private MainActivity mParent;
+    private final MainActivity mParent;
     private RecyclerView mRecyclerView;
     private ViewAdapter mAdapter;
     private GridAutofitLayoutManager mLayoutManager;
@@ -69,8 +64,8 @@ public class GameGridFragment extends Fragment implements GameList.OnRefreshList
     }
 
     private static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnLongClickListener {
-        private MainActivity mParent;
-        private ImageView mImageView;
+        private final MainActivity mParent;
+        private final ImageView mImageView;
         private GameListEntry mEntry;
 
         public ViewHolder(@NonNull MainActivity parent, @NonNull View itemView) {
@@ -84,9 +79,12 @@ public class GameGridFragment extends Fragment implements GameList.OnRefreshList
         public void bindToEntry(GameListEntry entry) {
             mEntry = entry;
 
+            // while it loads/generates
+            mImageView.setImageDrawable(ContextCompat.getDrawable(mParent, R.drawable.ic_media_cdrom));
+
             final String coverPath = entry.getCoverPath();
             if (coverPath == null) {
-                mImageView.setImageDrawable(ContextCompat.getDrawable(mParent, R.drawable.ic_media_cdrom));
+                new GenerateCoverTask(mParent, mImageView, mEntry.getTitle()).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
                 return;
             }
 
@@ -125,9 +123,9 @@ public class GameGridFragment extends Fragment implements GameList.OnRefreshList
     }
 
     private static class ViewAdapter extends RecyclerView.Adapter<ViewHolder> {
-        private MainActivity mParent;
-        private LayoutInflater mInflater;
-        private GameList mGameList;
+        private final MainActivity mParent;
+        private final LayoutInflater mInflater;
+        private final GameList mGameList;
 
         public ViewAdapter(@NonNull MainActivity parent, @NonNull GameList gameList) {
             mParent = parent;

android/app/src/main/java/com/github/stenzek/duckstation/GenerateCoverTask.java

@@ -0,0 +1,64 @@
+package com.github.stenzek.duckstation;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.os.AsyncTask;
+import android.text.Layout;
+import android.text.StaticLayout;
+import android.text.TextPaint;
+import android.widget.ImageView;
+
+import java.lang.ref.WeakReference;
+
+public class GenerateCoverTask extends AsyncTask<Void, Void, Bitmap> {
+    private final Context mContext;
+    private final WeakReference<ImageView> mView;
+    private final String mTitle;
+
+    public GenerateCoverTask(Context context, ImageView view, String title) {
+        mContext = context;
+        mView = new WeakReference<>(view);
+        mTitle = title;
+    }
+
+    @Override
+    protected Bitmap doInBackground(Void... voids) {
+        try {
+            final Bitmap background = BitmapFactory.decodeResource(mContext.getResources(), R.drawable.cover_placeholder);
+            if (background == null)
+                return null;
+
+            final Bitmap bitmap = Bitmap.createBitmap(background.getWidth(), background.getHeight(), background.getConfig());
+            final Canvas canvas = new Canvas(bitmap);
+            final TextPaint paint = new TextPaint(Paint.ANTI_ALIAS_FLAG);
+            canvas.drawBitmap(background, 0.0f, 0.0f, paint);
+
+            paint.setColor(Color.rgb(255, 255, 255));
+            paint.setTextSize(100);
+            paint.setShadowLayer(1.0f, 0.0f, 1.0f, Color.DKGRAY);
+            paint.setTextAlign(Paint.Align.CENTER);
+
+            final StaticLayout staticLayout = new StaticLayout(mTitle, paint,
+                    canvas.getWidth(), Layout.Alignment.ALIGN_NORMAL, 1, 0, false);
+            canvas.save();
+            canvas.translate(canvas.getWidth() / 2, (canvas.getHeight() / 2) - (staticLayout.getHeight() / 2));
+            staticLayout.draw(canvas);
+            canvas.restore();
+            return bitmap;
+        } catch (Exception e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    @Override
+    protected void onPostExecute(Bitmap bitmap) {
+        ImageView iv = mView.get();
+        if (iv != null)
+            iv.setImageBitmap(bitmap);
+    }
+}