当用户停止移动相机的Andr​​oid谷歌地图V2执行的AsyncTask [英] Android google maps v2 execute asynctask when user stops moving the camera

问题描述

我提出这是使用谷歌地图API V2的应用程序。我的问题是，当我注册相机更改侦听器，它执行每个摄像头的运动停止时不移动的时间。我要实现后者。如何修改我的code仅移动站时，需要注册？

下面是我的code：

  mMap.setOnCameraChangeListener（新GoogleMap.OnCameraChangeListener（）{
            @覆盖
            公共无效onCameraChange（CameraPosition位置）{
                的LatLngBounds边界= mMap.getProjection（）getVisibleRegion（）的LatLngBounds。;
                NE = bounds.northeast;
                SW = bounds.southwest;
                NE1 = ne.latitude;
                NE2 = ne.longitude;
                SW1 = sw.latitude;
                SW2 = sw.longitude;
                新DownloadJSON（）执行（）;
            }
        }）;
 

解决方案

我实现了自定义计时器都满足的条件，只有当一定时间后执行。这里是我的code：

  mMap.setOnCameraChangeListener（新GoogleMap.OnCameraChangeListener（）{
                @覆盖
                公共无效onCameraChange（CameraPosition位置）{
                    的LatLngBounds边界= mMap.getProjection（）getVisibleRegion（）的LatLngBounds。;
                    NE = bounds.northeast;
                    SW = bounds.southwest;
                    如果（T！= NULL）{
                        t.purge（）;
                        t.cancel（）;
                    }
                    T =新的Timer（）;
                    t.schedule（新的TimerTask（）{
                        公共无效的run（）{
                            如果（NE1 = ne.latitude和放大器;！＆安培;！NE2 = ne.longitude＆放大器;＆安培; SW1 = sw.latitude和放大器;！＆安培;！SW2 = sw.longitude）{
                                NE1 = ne.latitude;
                                NE2 = ne.longitude;
                                SW1 = sw.latitude;
                                SW2 = sw.longitude;
                                Log.d（变量，刷新数据）;
                                新DownloadJSON（）执行（）;
                                t.cancel（）;
                            }
                            其他{
                            NE1 = ne.latitude;
                            NE2 = ne.longitude;
                            SW1 = sw.latitude;
                            SW2 = sw.longitude;}
                            t.cancel（）; //也只是顶部的计时器线程，否则，你可能会收到一个崩溃报告
                        }
                    }，1000）;
                    //新DownloadJSON（）执行（）;
                }
            }）;
 

I am making an app which is using google maps api v2. My problem is that when I register camera change listener, it executes each time the camera moves not when the moving stops. I want to achieve the latter. How can I modify my code to register only when moving stops ?

Here is my code:

mMap.setOnCameraChangeListener(new GoogleMap.OnCameraChangeListener() {
            @Override
            public void onCameraChange(CameraPosition position) {
                LatLngBounds bounds = mMap.getProjection().getVisibleRegion().latLngBounds;
                ne = bounds.northeast;
                sw = bounds.southwest;
                ne1 = ne.latitude;
                ne2 = ne.longitude;
                sw1 = sw.latitude;
                sw2 = sw.longitude;
                new DownloadJSON().execute();
            }
        });

解决方案

I implemented custom timer to execute after certain time only when conditions are met. Here is my code:

mMap.setOnCameraChangeListener(new GoogleMap.OnCameraChangeListener() {
                @Override
                public void onCameraChange(CameraPosition position) {
                    LatLngBounds bounds = mMap.getProjection().getVisibleRegion().latLngBounds;
                    ne = bounds.northeast;
                    sw = bounds.southwest;
                    if(t!=null){
                        t.purge();
                        t.cancel();
                    }
                    t = new Timer();
                    t.schedule(new TimerTask() {
                        public void run() {
                            if(ne1 != ne.latitude && ne2 != ne.longitude && sw1 != sw.latitude && sw2 != sw.longitude){
                                ne1 = ne.latitude;
                                ne2 = ne.longitude;
                                sw1 = sw.latitude;
                                sw2 = sw.longitude;
                                Log.d("Tag","Refreshing data");
                                new DownloadJSON().execute();
                                t.cancel();
                            }
                            else{
                            ne1 = ne.latitude;
                            ne2 = ne.longitude;
                            sw1 = sw.latitude;
                            sw2 = sw.longitude;}
                            t.cancel(); // also just top the timer thread, otherwise, you may receive a crash report
                        }
                    }, 1000);
                    //new DownloadJSON().execute();
                }
            });

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