在Android中隐藏/移除/更改画布圆的颜色

Paint paint = new Paint();
paint.setColor(Color.TRANSPARENT); // 设置透明色

canvas.drawCircle(centerX, centerY, radius, paint); // 绘制透明圆

Paint paint = new Paint();
paint.setColor(Color.TRANSPARENT); // 设置透明色
paint.setStyle(Paint.Style.STROKE); // 设置描边样式

canvas.drawCircle(centerX, centerY, radius, paint); // 绘制描边圆

Paint paint = new Paint();
paint.setColor(Color.RED); // 设置颜色为红色

canvas.drawCircle(centerX, centerY, radius, paint); // 绘制红色圆