在我的Google地图中心创建十字线 [英] Creating a Crosshair in the Center of My Google Map

问题描述

我是Android开发新手，我遇到了一个问题，我一直在努力工作数小时而没有成功。我想在我的Google地图的中心创建一个十字线，即使在地图平移时，它仍停留在中心位置。我的可绘制目录中有一个十字线的.png图像。另外，我有一个MapView，它显示带有多个标记的Google Map。什么是最好的方法来解决这个问题？

I am new to Android development and I have a problem that I have been working on for hours with no success. I want to create a cross-hair in the center of my Google Map that stays in the center even when the map is panned. I have a .png image of the cross-hair in my drawable directory. Additionally, I have a MapView that displays the Google Map with several markers. What is the best way to approach this problem?

推荐答案

public class CrossHairsOverlay extends Overlay {
    public boolean draw(Canvas canvas, MapView mapView, boolean shadow, long when) {
        super.draw(canvas, mapView, shadow);
        GeoPoint centerGp = mapView.getMapCenter();
        Projection projection = mapView.getProjection();
        Point centerPoint = projection.toPixels(centerGp, null);
        Paint p = new Paint();
        Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.crosshairs_dial);
        canvas.drawBitmap(bmp, centerPoint.x, centerPoint.y, p);
        return true;
    }
}

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