Question

作为我的GPS functionality的基础HelloMap3D Nutiteq（Thx Jaak）的例子我改编自显示current GPS position这个例子的不同之处，所以，没有增长的黄色圆圈，但是修复蓝色半透明圆圈，center point作为我当前的位置，除了更新之外工作正常。如果location发生变化，它应该删除过去的位置此更新发生在方法onLocationChanged中的示例中 enter image description here

这是我的主要活动

中的代码

protected void initGps(final MyLocationCircle locationCircle) {
    final Projection proj = mapView.getLayers().getBaseLayer().getProjection();

    locationListener = new LocationListener() {
        @Override
        public void onLocationChanged(Location location) {

             locationCircle.setLocation(proj, location);
             locationCircle.setVisible(true);

        }

         // Another Methods...
     }
}

我已经像这样调整了MyLocationCircle Class

public void update() {

    //Draw center with a drawable
    Bitmap bitmapPosition = BitmapFactory.decodeResource(activity.getResources(), R.drawable.ic_home);
    PointStyle pointStyle = PointStyle.builder().setBitmap(bitmapPosition).setColor(Color.BLUE).build();

    // Create/update Point
    if ( point == null ) {          
        point = new Point(circlePos, null, pointStyle, null);
        layer.add(point);
    } else { // We just have to change the Position to actual Position
        point.setMapPos(circlePos);
    }

    point.setVisible(visible);


    // Build closed circle
    circleVerts.clear();
    for (float tsj = 0; tsj <= 360; tsj += 360 / NR_OF_CIRCLE_VERTS) {
        MapPos mapPos = new MapPos(circleScale * Math.cos(tsj * Const.DEG_TO_RAD) + circlePos.x, circleScale * Math.sin(tsj * Const.DEG_TO_RAD) + circlePos.y);
        circleVerts.add(mapPos);
    }

    // Create/update line
    if (circle == null) {           
        LineStyle    lineStyle    = LineStyle.builder().setWidth(0.05f).setColor(Color.BLUE).build();
        PolygonStyle polygonStyle = PolygonStyle.builder().setColor(Color.BLUE & 0x80FFFFFF).setLineStyle(lineStyle).build();//0xE0FFFF
        circle = new Polygon(circleVerts, null, polygonStyle, circle_data);

        layer.add(circle);
    } else {
        circle.setVertexList(circleVerts);
    }
    circle.setVisible(visible);
}

public void setVisible(boolean visible) {
    this.visible = visible;
}

public void setLocation(Projection proj, Location location) {
    circlePos       = proj.fromWgs84(location.getLongitude(), location.getLatitude());
    projectionScale = (float) proj.getBounds().getWidth();
    circleRadius    = location.getAccuracy();

    // Here is the most important modification 
    update();
}

因此，每次我们的位置更改都会调用onLocationChanged(Location location)方法，并且会调用locationCircle.setLocation(location)并且最后一次调用它，它将被称为update。

问题是，我做错了什么？和我该如何解决？

提前谢谢。

Answer 1

您可以在每次更新时创建并添加新圈子。您应该重用单个，只需使用setVertexList（）更新顶点。特别是这一行应该在onLocationChanged循环之外，在initGPS的某个地方可能是：

circle = new Polygon(circleVerts, null, polygonStyle, circle_data);

我目前在Nutiteq下的GPS位置未正确更新

1 个答案: