android - ARGB8888画质差

Question

我尝试将文本添加drawable到layerdrawable. 我尝试了以下代码：

Bitmap canvasBitmap = Bitmap.createBitmap(sb.getWidth(), sb.getHeight(), Bitmap.Config.ARGB_8888);
Canvas imageCanvas = new Canvas(canvasBitmap);
imageCanvas.drawARGB(0, 0, 0, 0);
Paint p = new Paint();
p.setColor(Color.WHITE);
p.setTextSize(40);
imageCanvas.drawText("Sample text display here", 0, sb.getHeight()/2, p);
LayerDrawable background = new LayerDrawable(new Drawable[]{new BitmapDrawable(canvasBitmap)});

但是与其他文本字段相比，质量很差。

我需要关于如何提高文本质量或以其他方式将文本添加到drawable.