在两点之间画一条线 android & google maps

Question

我在谷歌地图上工作，我想在两点之间画一条线我使用了本网站用户问题中的以下代码，但它对我不起作用我在删除此功能时强制关闭在应用程序的内部类中工作

但我需要它，因为我必须画线

我使用的代码如下：

    class MyOverlay extends com.google.android.maps.Overlay {
    GeoPoint [] geoPointsArray ;
// constructor 
public MyOverlay(){

    }   

@Override 
public void draw(Canvas canvas, MapView mapv, boolean shadow){
    super.draw(canvas, mapv, shadow);

    Paint   mPaint = new Paint();
    mPaint.setDither(true);
    mPaint.setColor(Color.RED);
    mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
    mPaint.setStrokeJoin(Paint.Join.ROUND);
    mPaint.setStrokeCap(Paint.Cap.ROUND);
    mPaint.setStrokeWidth(2);

    GeoPoint gP1 = new GeoPoint(19240000,-99120000);
    GeoPoint gP2 = new GeoPoint(37423157, -122085008);

    Point p1 = new Point();
    Point p2 = new Point();
    Path path = new Path();

    projection.toPixels(gP1, p1);
    projection.toPixels(gP2, p2);

    path.moveTo(p2.x, p2.y);
    path.lineTo(p1.x,p1.y);

    canvas.drawPath(path, mPaint);
}

}//内部类结束

我真的需要帮助，当我刚刚添加这个东西时，我被强制关闭了：S

Answer 1

试试这个给你的叠加层添加一个或多个点并用红色填充它们。

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

        Paint mPaint = new Paint();
        mPaint.setDither(true);
        mPaint.setStyle(Style.FILL_AND_STROKE);
        mPaint.setColor(Color.RED);
        mPaint.setAlpha(9);
        mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
        mPaint.setStrokeJoin(Paint.Join.ROUND);
        mPaint.setStrokeCap(Paint.Cap.ROUND);
        mPaint.setStrokeWidth(2);

        Path path = new Path();

        Projection projection = mapView.getProjection();

        for(int j = 0; j < geoArrayist.size(); j++) 
        {
            Iterator<GeoPoint> it = geoArrayist.iterator();
            while(it.hasNext()) 
            {
                GeoPoint arrayListGeoPoint = it.next();

                Point currentScreenPoint = new Point();
                projection.toPixels(arrayListGeoPoint, currentScreenPoint);

                if(j == 0)
                    path.moveTo(currentScreenPoint.x, currentScreenPoint.y); 
                else
                    path.lineTo(currentScreenPoint.x, currentScreenPoint.y);
            }                 
        }
        // old_geopoint = new_geopoint;
        canvas.drawPath(path, mPaint);
    }   

geoArrayList 是一个地理点列表。

Answer 2

使用下面的堆栈溢出答案在谷歌地图上的两点之间绘制路线，它可能会对你有所帮助。

Draw Route Path on Google Map