我当前正在编写一个应用程序,该应用程序每分钟(或其他指定的时间)接收位置数据,然后将其发送到服务器.
I am currently writing an application that receives location data every minute (or other specified amount of time) and thes send it to server.
我注意到的问题是: 当我将应用程序连接到电源时,它可以正常工作-以定义的时间间隔发送更新. 当我在电池上使用它时,它会随机发送更新.
The problem that I have noticed is: When I use my application connected to power source it works perfectly - sends updates with defined interval. When I use it on battery it sends updates randomly.
对于我的应用程序,我使用计时器指定更新间隔.此计时器在后台服务中运行.我要求在计时器中进行更新,并在收到位置信息时删除更新. 我的代码片段:
For my application I use timer to specify interval of update. This timer runs in Background service. I request updates in timer and remove updates when I receive location. Fragment of my code:
private class mainTask extends TimerTask { public void run() { toastHandler.sendEmptyMessage(0); } } private final Handler toastHandler = new Handler() { @Override public void handleMessage(Message msg) { date = date.getInstance(); //used to set time of update. if(!GPSupdating) { locationManager.requestLocationUpdates("gps", 0, 0, locationListenerGPS); GPSupdating = true; } } };我的位置侦听器:
LocationListener locationListenerGPS = new LocationListener() { public void onLocationChanged(Location updatedLocation) { myGPSLocation = updatedLocation; haveLocationGPS = true; locationManager.removeUpdates(locationListenerGPS); GPSupdating = false; } public void onStatusChanged(String provider, int status, Bundle extras) {} public void onProviderEnabled(String provider) {} public void onProviderDisabled(String provider) {} };您知道为什么它不能正常工作吗?
Do you have any idea why this is not working correctly?
推荐答案您不会通过每分钟启用和禁用GPS来节省能源.选择更大的间隔(5分钟),或者第二次获取该位置. 然后将位置存储在lastValidLocation字段中,启动自己的计时器,并每分钟读取一次lastValidLocation.并发送到服务器(如果已更改).
You will not save energy by enabling and disabling GPS once per minute. Either choose a greater intervall (5 minute) or get the location evry second. Then store the location in a lastValidLocation filed, start your own Timer, and once a minute read out lastValidLocation. and send to server if changed.
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