绘制文字 缩小 阴影不随之缩小的处理

canvas.scale(zoom, zoom);
TextPaint textPaint = new TextPaint();
textPaint.setAntiAlias(true);
DynamicLayout layout = new DynamicLayout(text, textPaint, width,
                            Layout.Alignment.ALIGN_NORMAL, 1.0f, 1.0f, false);
layout.draw(canvas);

注意加

textPaint.setSubpixelText(true);