我想做以下事情:
1] - 收听手机GPS位置的变化并将其发送到服务器以持续跟踪用户位置
2] - 我找到了一个使用LocationListener
查找GPS位置的示例3] - 我找到了一种在设备重启时打开我的应用程序的方法
即使用户将应用程序置于后台,我也需要一些帮助才能发送此数据
这里有什么帮助吗?
答案 0 :(得分:1)
此服务应该在后台运行
LocationClient是与位置相关的API的主要入口点,例如位置和地理围栏。
使用LocationClient:
要建立连接,请调用connect()并等待onConnected(android.os.Bundle)回调。
LocationRequest个对象用于从LocationClient请求位置更新的服务质量。
在LocationRequest中,您可以设置参数,例如位置的准确性和位置更新之间的时间间隔。onLocationChanged将根据您在LocationRequest中设置的时间间隔进行调用,然后您可以更新服务器。 该服务不在后台运行,因此您需要使用AsyncTask或其他方式更新服务器,只需确保服务器更新在后台线程上完成。
public class LocationUpdatesService extends Service implements GooglePlayServicesClient.ConnectionCallbacks,
GooglePlayServicesClient.OnConnectionFailedListener,
LocationListener {
private static int LOCATION_UPDATE_INTERVAL = 30000; // how often you will get a location update (this is in milliseconds)
private LocationClient locationClient;
private LocationRequest locationRequest;
private boolean isConnected = false;
@Override
// onCreate is called when the service gets started (from an Activity) than immediately calls onStartCommand
public void onCreate() {
super.onCreate();
if (servicesConnected()) {
startLocationUpdates();
} else {
// isGooglePlayServicesAvailable FAILURE
}
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
return Service.START_STICKY;
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
private boolean servicesConnected() {
int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
if (ConnectionResult.SUCCESS == resultCode) {
return true;
} else {
return false;
}
}
public void startLocationUpdates() {
locationRequest = LocationRequest.create();
locationRequest.setInterval(LOCATION_UPDATE_INTERVAL);
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationRequest.setFastestInterval(LOCATION_UPDATE_INTERVAL);
locationClient = new LocationClient(this, this, this);
locationClient.connect();
isConnected = true;
}
@Override
public void onDestroy() {
if (locationClient.isConnected()) {
onDisconnectClient();
} else {
// locationClient is disconnected
}
super.onDestroy();
}
private void onDisconnectClient() {
isConnected = false;
locationClient.removeLocationUpdates(this);
locationClient.disconnect();
locationRequest = null;
locationClient = null;
}
@Override
public void onLocationChanged(Location location) {
// update server from here with AsyncTask (or some other way but in the background)
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
}
@Override
public void onConnected(Bundle bundle) {
locationClient.requestLocationUpdates(locationRequest, this);
}
@Override
public void onDisconnected() {
}
}
有用的链接:
http://developer.android.com/reference/android/app/Service.html
http://developer.android.com/guide/components/services.html
http://developer.android.com/reference/android/location/LocationListener.html
https://developer.android.com/reference/com/google/android/gms/location/LocationRequest.html
https://developer.android.com/reference/com/google/android/gms/location/LocationListener.html