当我的地理位置改变如何做什么？ [英] How to make anything when my geolocation is changed?

问题描述

我要做出一些动作，即每当我的地理位置将被改变时，文本'我在这里'显示对话框。

I want to make some action, i.e. show dialog with text 'im here' every time when my geolocation will be changed.

我使用MyLocationOverlay动用我对谷歌地图的图形页面的位置点。

I'm using MyLocationOverlay to draw a dot on my location on the Google Maps's mapview.

我怎样才能做到这一点？

How can I achieve that?

推荐答案

下面是位置监听器类 -

Below is the location listener class -

private MyOverLay draw = new MyOverLay();

 class MyLocationListener_gps implements LocationListener {
                public void onLocationChanged(Location location) {

                    clat = location.getLatitude();
                    clon = location.getLongitude();
                                GeoPoint geoPoint = new GeoPoint((int) (clat * 1E6),
                                        (int) (clon * 1E6));
                                    mapView.getController().animateTo(geoPoint);

                                    draw = new MyOverLay(geoPoint);
                                    mapView.getOverlays().add(draw);
        }
                }

下面是code类覆盖 -

Here is code overlay class-

class MyOverLay extends Overlay {
        private GeoPoint gp1;
        private int mRadius = 3;

        public MyOverLay() {

        }

        public MyOverLay(GeoPoint gp1) {
            this.gp1 = gp1;
        }

        @Override
        public boolean draw(Canvas canvas, MapView mapView, boolean shadow,
                long when) {

            Projection projection = mapView.getProjection();
            if (shadow == false) {

                Paint paint = new Paint();
                paint.setAntiAlias(true);

                Point point = new Point();
                projection.toPixels(gp1, point);
                paint.setColor(Color.BLUE);

                RectF oval = new RectF(point.x - mRadius, point.y - mRadius,
                        point.x + mRadius, point.y + mRadius);

                canvas.drawOval(oval, paint);
            }

            return super.draw(canvas, mapView, shadow, when);
        }

    }

这将绘制一个蓝色圆点为u移动和UR坐标chnage。

It will draw a blue dot as u move and ur co-ordinates chnage.

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