0
我正在实施跟踪服务以跟踪我所在城市的巴士位置。巴士配有WIFI access point (AP)。所以我会从JSON文本文件中解析出来后，根据WIFI AP的SSID检测路由号码。我已经实现了一个BroadcastReceiver来完成这项工作，但为了避免公交车暂时靠近用户并且用户没有进入公交车（可能是因为公交车不是用户正在等待的公交车）希望在60秒后将路由发送到服务器。因此，应用程序必须首次捕获SSID，然后在60秒后检查它是否仍在范围内，然后在此情况下将路由发送到服务器。我的情况怎么办？在将捕获的SSID发送到服务器之前等待60秒
我很感激任何帮助。在JSON文件
部分：
{
"wifi": [
{
"ssid": "Fr Privat",
"route_number": 1
},
{
"ssid": "Fr WLAN Hotspot+",
"route_number": 4
}
]
}
TrackingService类：
public class TrackingService extends Service implements
LocationListener {
private int route_number = 0;
private final BroadcastReceiver wifi_receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
if (wifi.isWifiEnabled()) {
WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
final List<ScanResult> results = wifiManager.getScanResults();
if (results != null) {
// list of access points from the last scan
List<ScanResult> updatedResults = new ArrayList<ScanResult>();
// pick Wi-Fi access points which begins with these "Fr"
// characters.
for (int i = 0; i < results.size(); i++) {
String ssid = results.get(i).SSID;
if (ssid.startsWith("Fr")) {
updatedResults.add(results.get(i));
}
}
if (updatedResults.size() > 0 && route_number == 0) {
String ssid = deliverBestAccessPoint(updatedResults);
// retrieve data from json String and parse it.
route_number = parse_SSID(ssid);
}
}
} else {
Toast.makeText(context, "Please turn your Wi-Fi on",
Toast.LENGTH_SHORT).show();
}
}
private String deliverBestAccessPoint(final List<ScanResult> updatedResults) {
ScanResult bestSignal = (ScanResult) updatedResults.get(0);
for (int i = 1; i < updatedResults.size(); i++) {
ScanResult result = (ScanResult) updatedResults.get(i);
bestSignal = (WifiManager.compareSignalLevel(bestSignal.level,
result.level) < 0) ? result : bestSignal;
}
return bestSignal.SSID;
}
};
@Override
public void onLocationChanged(Location location) {
if (location != null) {
......
String jSONString = convertToJSON(mac, pLong, pLat, time, speed);
if (isNetworkAvailable()) {
PostData sender = new PostData(TrackingService.this);
sender.post_data(jSONString, this);
}
}
}
}