Java 如何在android中在地图上的地理点之间绘制虚线？

我已经在这里提到了链接，在那里

Bitmap bmp = BitmapFactory.decodeResource(this.getResources(),R.drawable.greenflag);
Bitmap bmp = BitmapFactory.decodeResource(this.getResources(),R.drawable.redflag);

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在drawble.greenflag中，即图像文件或xml文件？

使用此选项在两个地理点之间绘制线

class MyOverlay extends Overlay 
{
  public MyOverlay() {
  }
  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(100);
   for (int i = 0; i < numPoints - 1; i++) {
    float latiA = (float) Double.parseDouble(latlong[i].getLat());
    float longiA = (float) Double.parseDouble(latlong[i].getLon());
    float latiB = (float) Double.parseDouble(latlong[i + 1].getLat());
    float longiB = (float) Double.parseDouble(latlong[i + 1].getLon());
    //distance = getDistance(latiA, longiA, latiB, longiB);
    int latA = (int) (1000000 * Double.parseDouble(latlong[i].getLat()));
    int longA = (int) (1000000 * Double.parseDouble(latlong[i].getLon()));
    int latB = (int) (1000000 * Double.parseDouble(latlong[i + 1].getLat()));
    int longB = (int) (1000000 * Double.parseDouble(latlong[i + 1].getLon()));
    GeoPoint gP1 = new GeoPoint(latA, longA);
    GeoPoint gP2 = new GeoPoint(latB, longB);
    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);
   }
    }
}

类MyOverlay扩展覆盖
{
公共MyOverlay（）{
}
公共空白绘制（画布、MapView mapv、布尔阴影）{
super.draw（画布、贴图、阴影）；
Paint mPaint=新油漆（）；
mPaint.setDither（true）；
mPaint.setColor（Color.RED）；
mPaint.setStyle（绘制、样式、填充和笔划）；
mPaint.setStrokeJoin（油漆.连接.圆形）；
mPaint.setStrokeCap（油漆盖圆形）；
mPaint.设定行程宽度（100）；
对于（int i=0；i

publicvoiddraw（Canvas-Canvas、MapView-mapv、boolean-shadow）在这种情况下，您能给出Canvas声明格式吗？