Question

我正在创建一个应用程序，我正在绘制从当前标记到附近标记的路线。当我点击附近的标记时它创建了一条路线，当我再次点击另一个标记时，前一条路线仍显示。所以我想删除以前的路线并绘制从当前标记到附近标记的新路线。请帮我使用我的源代码....

mMap.setInfoWindowAdapter(new GoogleMap.InfoWindowAdapter() {

                    @Override
                    public View getInfoWindow(Marker arg0) {

                        return null;
                    }

                    @Override
                    public View getInfoContents(Marker marker) {

                        //for direction Route

                        if(CurrentMarker != null) {
                            LatLng origin = CurrentMarker.getPosition();
                            LatLng dest = marker.getPosition();

                            String url = getDirectionsUrl(origin, dest);

                            DownloadPar downloadPar = new DownloadPar();

                            // Start downloading json data from Google Directions API
                            downloadPar.execute(url);

                        }


                        View myContentsView = getLayoutInflater().inflate(R.layout.details, null);
                        TextView tvTitle = ((TextView)myContentsView.findViewById(R.id.title));
                        tvTitle.setText(marker.getTitle());
                        TextView tvSnippet = ((TextView)myContentsView.findViewById(R.id.snippet));
                        tvSnippet.setText(marker.getSnippet());


                        return myContentsView;



                    }
                });

请帮帮我... 感谢

Answer 1

protected void onPostExecute（List＆gt;＆gt; result）{ ArrayList points = null;

NotificationCompat.Builder builder =
new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle("Notification")
.setContentText("Hello !!!")
.setDefaults(Notification.DEFAULT_ALL)
.setPriority(NotificationCompat.PRIORITY_HIGH)
.addAction(R.drawable.ic_launcher,
"View Call", null)
.addAction(R.drawable.ic_launcher,
"Call Back", null);

// Gets an instance of the NotificationManager service
NotificationManager notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(0, builder.build());

Answer 2

声明变量：

private Polyline polyline;

然后在您最初将Polyline添加到Map：

时的方法中

polyline = mMap.addPolyline(lineOptions);

然后当你想要更新Polyline时，我相信你可以使用：

polyline.setPoints(newPoints);

否则，请通过调用polyline.setMap(null)删除折线，然后像上面所做的那样创建一个新折线。

有关Polyline的详细信息，请参阅documentation

如何在点击另一个标记时清除折线

2 个答案: