Android mapview(负着色)

Question

我想在我的 Android 应用程序中绘制一个圆形覆盖层，我当然可以轻松地做到这一点并为其添加颜色。

但我真正想做的是保持圆透明，并用浅灰色遮蔽圆的外部(世界其他地方)。

我尝试将圆圈添加为路径，为世界添加阴影并剪掉圆圈，但我在设备上的圆圈周围出现了一个边界框(尽管它在模拟器上看起来不错)。

感谢任何帮助。下面是一段代码:

public void draw(Canvas canvas, MapView mapView, boolean shadow) { super.draw(canvas, mapView, shadow);

    Projection projection = mapView.getProjection();

    Point pt = new Point();

    GeoPoint geo = new GeoPoint((int) (mLat * 1e6), (int) (mLon * 1e6));

    projection.toPixels(geo, pt);
    float circleRadius = projection.metersToEquatorPixels(mRadius)
            * (1 / FloatMath.cos((float) Math.toRadians(mLat)));

    Paint innerCirclePaint;

    innerCirclePaint = new Paint();
    innerCirclePaint.setColor(Color.TRANSPARENT);
    innerCirclePaint.setAlpha(35);
    innerCirclePaint.setAntiAlias(true);
    innerCirclePaint.setStyle(Paint.Style.FILL);

    Path path = new Path();
    path.setFillType(Path.FillType.WINDING);
    path.addCircle((float) pt.x, (float) pt.y, circleRadius, Path.Direction.CCW);canvas.drawPath(path, innerCirclePaint);
    canvas.drawARGB(150, 0, 0, 0 );
    canvas.clipPath(path);
}

Answer 1

paint.setColor(Color.parseColor ("#88ff0000"));