UI: Fix typecast exception when trying to get Bitmap off a Drawable

src/main/java/com/amaze/filemanager/ui/views/RoundedImageView.java

@@ -37,7 +37,7 @@ public class RoundedImageView extends ImageView {
         if (getWidth() == 0 || getHeight() == 0) {
             return;
         }
-        Bitmap b = ((BitmapDrawable) drawable).getBitmap();
+        Bitmap b = drawableToBitmap(drawable);
         Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);
 
         int w = getWidth(), h = getHeight();
@@ -76,6 +76,34 @@ public class RoundedImageView extends ImageView {
         return output;
     }
 
+    /**
+     * Converts a {@link Drawable} to {@link Bitmap}
+     * A drawable can be drawn on a {@link Canvas} and a Canvas can be backed by a Bitmap.
+     * Hence the conversion
+     * @param drawable
+     * @return
+     */
+    public static Bitmap drawableToBitmap (Drawable drawable) {
+        Bitmap bitmap;
+
+        if (drawable instanceof BitmapDrawable) {
+            BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
+            if(bitmapDrawable.getBitmap() != null) {
+                return bitmapDrawable.getBitmap();
+            }
+        }
+
+        if(drawable.getIntrinsicWidth() <= 0 || drawable.getIntrinsicHeight() <= 0) {
+            bitmap = Bitmap.createBitmap(1, 1, Bitmap.Config.ARGB_8888); // Single color bitmap will be created of 1x1 pixel
+        } else {
+            bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
+        }
+
+        Canvas canvas = new Canvas(bitmap);
+        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
+        drawable.draw(canvas);
+        return bitmap;
+    }
 }