后台持续位置更新 [英] Continuous location updates in background
本文介绍了后台持续位置更新的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在开发一个应用程序，它将不断从后台服务发送位置更新。
public class LocationService extends Service implements LocationListener，
GooglePlayServicesClient.ConnectionCallbacks，
GooglePlayServicesClient .OnConnectionFailedListener {
LocationRequest mLocationRequest;
LocationClient mLocationClient;
@Override
public void onCreate（）{
//在手机中创建日志文件
appendLog（DateFormat.getDateTimeInstance（）.format（new Date（））+：Service创建：，com.example.locationservice.Constants.LOG_FILE）;
mLocationRequest = LocationRequest.create（）;
mLocationRequest.setInterval（5 * 1000）;
mLocationRequest.setPriority（LocationRequest.PRIORITY_HIGH_ACCURACY）;
// mLocationRequest.setFastestInterval（5 * 1000）;
mLocationClient = new LocationClient（getApplicationContext（），this，this）;
mLocationClient.connect（）;
$ b @Override
public void onStart（Intent intent，int startId）{
int start = Service.START_STICKY;
appendLog（DateFormat.getDateTimeInstance（）。format（new Date（））+：Service Started：，com.example.locationservice.Constants.LOG_FILE）;
$ b @Override
public void onConnectionFailed（ConnectionResult connectionResult）{
// TODO自动生成的方法存根
appendLog（DateFormat .getDateTimeInstance（）。format（new Date（））+：Connection to client failed，com.example.locationservice.Constants.LOG_FILE）;
this.stopSelf（）;
}
@Override
public void onConnected（Bundle arg0）{
// TODO自动生成的方法存根
Log.i （信息，位置客户连接）;
appendLog（DateFormat.getDateTimeInstance（）。format（new Date（））+：Location Client Connectd：，com.example.locationservice.Constants.LOG_FILE）;
//检查是否启用locaton
if（Util.isLocationEnabled（getApplicationContext（）））{
//检查Internet是否可用
if（Util.isInternetOn（ getApplicationContext（）））{
mLocationClient.requestLocationUpdates（mLocationRequest，this）;
} else {
Log.i（info，Internet not available）;
appendLog（DateFormat.getDateTimeInstance（）。format（new Date（））+：Internet not available，com.example.locationservice.Constants.LOG_FILE）;
this.stopSelf（）;
}
} else {
Log.i（info，Location Acess disabled）;
appendLog（DateFormat.getDateTimeInstance（）.format（new Date（））+：Location Acess disabled，com.example.locationservice.Constants.LOG_FILE）;
this.stopSelf（）;
Log.i（info，Service Connect status ::+ isServicesConnected（））;
$ b @Override
public void onDisconnected（）{
// TODO自动生成的方法存根
appendLog（DateFormat.getDateTimeInstance （）.format（new Date（））+：Location Client DisConnectd：，com.example.locationservice.Constants.LOG_FILE）;
Log.i（info，Location Client Disconnected）;
}
@Override
public void onLocationChanged（Location location）{
// TODO自动生成的方法存根
double latitude = location.getLatitude（）;
double longitude = location.getLongitude（）;
appendLog（DateFormat.getDateTimeInstance（）.format（new Date（））+：Location Changed：，com.example.locationservice.Constants.LOG_FILE）;
Log.i（info，Latitude ::+ latitude）;
Log.i（info，Longitude ::+ longitude）;
if（Util.isInternetOn（getApplicationContext（）））{
//发送位置详细信息
sendLocation（location）;
} else {
this.stopSelf（）;
Log.i（info，Internet not available）;
appendLog（DateFormat.getDateTimeInstance（）。format（new Date（））+：Internet not available，com.example.locationservice.Constants.LOG_FILE）;
@Override
public IBinder onBind（Intent intent）{
// TODO自动生成的方法存根
返回null ;
@Override
public void onDestroy（）{
// TODO自动生成的方法存根
Log.i（info，Service is destroyed ）;
mLocationClient.removeLocationUpdates（this）;
appendLog（DateFormat.getDateTimeInstance（）。format（new Date（））+：Service Destroyed：，com.example.locationservice.Constants.LOG_FILE）;
super.onDestroy（）;
}
private boolean isServicesConnected（）{
//检查Google Play服务是否可用
int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable（LocationService.this）;
//如果Google Play服务可用
if（ConnectionResult.SUCCESS == resultCode）{
return true;
} else {
return false;
code
$ b 但 onLocationChanged 仅在我打开内置地图应用程序时调用。另外明智的是它不更新位置细节。
我从使用警报服务的活动开始了此服务。每一分钟触发一次 alarmManager 。任何人都可以告诉我为什么onLocationChanged不会连续调用。
预先感谢。
解决方案
$ b @Override
public void onCreate（）{
/ /创建日志文件
appendLog（DateFormat.getDateTimeInstance（）。format（new Date（））+：Service created：，com.example.locationservice.Constants.LOG_FILE）;
mLocationClient = new LocationClient（getApplicationContext（），this，this）;
}
将您的onStart替换为：
@Override
public int onStartCommand（Intent intent，int flags，int startId）{
mLocationClient.connect（）;
和：
<$ （
mLocationRequest = LocationRequest.create（）;
mLocationRequest.setInterval（5 * 1000）;
mLocationRequest.setPriority（LocationRequest.PRIORITY_HIGH_ACCURACY）;
mLocationClient.requestLocationUpdates（mLocationRequest，this）;
调用您的服务：
startService（yourServiceIntent）;
您也可以查看我的代码这里
i am developing a application which will send location updates continuously from a background service. i tried following code.
public class LocationService extends Service implements LocationListener,
GooglePlayServicesClient.ConnectionCallbacks,
GooglePlayServicesClient.OnConnectionFailedListener {
LocationRequest mLocationRequest;
LocationClient mLocationClient;
@Override
public void onCreate() {
//creating log file in mobile
appendLog(DateFormat.getDateTimeInstance().format(new Date()) + ": Service created:", com.example.locationservice.Constants.LOG_FILE);
mLocationRequest = LocationRequest.create();
mLocationRequest.setInterval(5*1000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
// mLocationRequest.setFastestInterval(5*1000);
mLocationClient = new LocationClient(getApplicationContext(), this,this);
mLocationClient.connect();
}
@Override
public void onStart(Intent intent, int startId) {
int start = Service.START_STICKY;
appendLog(DateFormat.getDateTimeInstance().format(new Date()) + ": Service Started:", com.example.locationservice.Constants.LOG_FILE);
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
// TODO Auto-generated method stub
appendLog(DateFormat.getDateTimeInstance().format(new Date()) + ": Connection to client failed", com.example.locationservice.Constants.LOG_FILE);
this.stopSelf();
}
@Override
public void onConnected(Bundle arg0) {
// TODO Auto-generated method stub
Log.i("info", "Location Client is Connected");
appendLog(DateFormat.getDateTimeInstance().format(new Date()) + ": Location Client Connectd:", com.example.locationservice.Constants.LOG_FILE);
//checking for locaton enabled or not
if(Util.isLocationEnabled(getApplicationContext())){
//checking for internet available or not
if(Util.isInternetOn(getApplicationContext())){
mLocationClient.requestLocationUpdates(mLocationRequest, this);
}else{
Log.i("info", "Internet not available");
appendLog(DateFormat.getDateTimeInstance().format(new Date()) + ": Internet not available", com.example.locationservice.Constants.LOG_FILE);
this.stopSelf();
}
}else{
Log.i("info", "Location Acess disabled");
appendLog(DateFormat.getDateTimeInstance().format(new Date()) + ": Location Acess disabled", com.example.locationservice.Constants.LOG_FILE);
this.stopSelf();
}
Log.i("info", "Service Connect status :: " + isServicesConnected());
}
@Override
public void onDisconnected() {
// TODO Auto-generated method stub
appendLog(DateFormat.getDateTimeInstance().format(new Date()) + ": Location Client DisConnectd:", com.example.locationservice.Constants.LOG_FILE);
Log.i("info", "Location Client is DisConnected");
}
@Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
double latitude = location.getLatitude();
double longitude = location.getLongitude();
appendLog(DateFormat.getDateTimeInstance().format(new Date()) + ": Location Changed:", com.example.locationservice.Constants.LOG_FILE);
Log.i("info", "Latitude :: " + latitude);
Log.i("info", "Longitude :: " + longitude);
if(Util.isInternetOn(getApplicationContext())){
//sending location details
sendLocation(location);
}else{
this.stopSelf();
Log.i("info", "Internet not available");
appendLog(DateFormat.getDateTimeInstance().format(new Date()) + ": Internet not available", com.example.locationservice.Constants.LOG_FILE);
}
}
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onDestroy() {
// TODO Auto-generated method stub
Log.i("info", "Service is destroyed");
mLocationClient.removeLocationUpdates(this);
appendLog(DateFormat.getDateTimeInstance().format(new Date()) + ": Service Destroyed:", com.example.locationservice.Constants.LOG_FILE);
super.onDestroy();
}
private boolean isServicesConnected() {
// Check that Google Play services is available
int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(LocationService.this);
// If Google Play services is available
if (ConnectionResult.SUCCESS == resultCode) {
return true;
} else {
return false;
}
}
}
but onLocationChanged is calling only when i opend the inbuilt map application. other wise it is not updating the location details.
i started this service from a activity using alarm service. alarmManager triggers for every one minute. can any one tell me why onLocationChanged is not calling continuously.
Thanks in advance.
解决方案 Try this:
@Override
public void onCreate() {
//creating log file in mobile
appendLog(DateFormat.getDateTimeInstance().format(new Date()) + ": Service created:", com.example.locationservice.Constants.LOG_FILE);
mLocationClient = new LocationClient(getApplicationContext(), this,this);
}
replace your onStart with:
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
mLocationClient.connect();
}
and:
@Override
public void onConnected(Bundle arg0) {
mLocationRequest = LocationRequest.create();
mLocationRequest.setInterval(5*1000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mLocationClient.requestLocationUpdates(mLocationRequest, this);
}
Invoke your service:
startService(yourServiceIntent);
You can also check my code here
这篇关于后台持续位置更新的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
