我正在尝试将用户位置设置为网络位置或gps位置或两者。因为我正在运行实现LocationListener的后台服务。我还在清单文件中添加了所有必需权限。这是我的服务
public class GetLocation extends Service implements LocationListener {
LocationManager lm;
Location networkLocation, gpsLocation;
@Override
public void onCreate() {
super.onCreate();
lm = (LocationManager) getSystemService(LOCATION_SERVICE);
if (lm.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
gpsLocation = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
Toast.makeText(getApplicationContext(), "Getting Location Via GPS",
Toast.LENGTH_LONG).show();
}
if (lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0,
this);
networkLocation = lm
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
Toast.makeText(getApplicationContext(),
"Getting location Via Network", Toast.LENGTH_LONG).show();
}
if (gpsLocation != null) {
Toast.makeText(
getApplicationContext(),
"GPSLOCATION: " + gpsLocation.getLatitude() + " , "
+ gpsLocation.getLongitude(), Toast.LENGTH_LONG)
.show();
}
if (networkLocation != null) {
Toast.makeText(
getApplicationContext(),
"NETWORKLOCATION: " + networkLocation.getLatitude() + " , "
+ networkLocation.getLongitude(), Toast.LENGTH_LONG)
.show();
}
if (gpsLocation == null && networkLocation == null) {
Toast.makeText(getApplicationContext(),
"Couldn't get user location", Toast.LENGTH_LONG).show();
}
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
new Thread() {
public void run() {
Looper.prepare();
if (gpsLocation != null) {
Log.d("Usman", "GPSLOCATION: " + gpsLocation.getLatitude()
+ " , " + gpsLocation.getLongitude());
}
if (networkLocation != null) {
Log.d("Usman",
"NETWORKLOCATION: " + networkLocation.getLatitude()
+ " , " + networkLocation.getLongitude());
}
if (gpsLocation == null && networkLocation == null) {
Log.d("Usman", "Couldn't get user lcoation");
}
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
e.printStackTrace();
}
Looper.loop();
}
}.start();
return START_STICKY;
}
@Override
public IBinder onBind(Intent arg0) {
return null;
}
@Override
public void onLocationChanged(Location location) {
// do something with this location
Toast.makeText(
getApplicationContext(),
location.getProvider() + " Location Changed:"
+ location.getLatitude() + " , "
+ location.getLongitude(), Toast.LENGTH_LONG).show();
}
@Override
public void onProviderDisabled(String arg0) {
Toast.makeText(getApplicationContext(), arg0 + " Disabled",
Toast.LENGTH_LONG).show();
}
@Override
public void onProviderEnabled(String provider) {
Toast.makeText(getApplicationContext(), provider + " Enabled",
Toast.LENGTH_LONG).show();
}
@Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
}
}
在onCreate（）方法中，gps和网络位置都为空。 谁能告诉我哪里错了
答案 0 :(得分：1)
正如你所说，你甚至没有得到“通过网络获取位置”的祝酒词。所以你的执行不会进入
的if块if (lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
}
因此请确保您已选中
Google的位置服务 - 已检查
在您的设备设置中。
设置＆gt;位置服务＆gt; Google的位置服务和访问位置。
然后你应该从LocationManager获取位置。其余的代码看起来很好。
希望这有帮助。
答案 1 :(得分：0)
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
或
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 10, 1000*60*1, this);
答案 2 :(得分：0)
您需要牢记权限：
1.如果您想同时使用NETWORK_PROVIDER和GPS_PROVIDER使用许可。
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
2.如果只想使用NETWORK_PROVIDER 使用
<uses-permission android:name="android.permission. ACCESS_COARSE_LOCATION" />
3.正常人可以做一个非常常见的错误。不要忘记给互联网许可
<uses-permission android:name="android.permission.INTERNET" />
4.第一个定位位置可以足够长，// locationManager.getLastKnownLocation（locationProvider）为您提供缓存位置 它也可以为空。
您可以根据特定标准请求位置：
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 5; // 5 minute
Criteria criteria = new Criteria();
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(false);
criteria.setPowerRequirement(Criteria.POWER_LOW);
criteria.setAccuracy(Criteria.ACCURACY_FINE);
String providerFine = locationManager.getBestProvider(criteria,
true);
criteria.setAccuracy(Criteria.ACCURACY_COARSE);
String providerCoarse = locationManager.getBestProvider(criteria,
true);
if (providerCoarse != null) {
locationManager.requestLocationUpdates(providerCoarse,
MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES,
this);
}
if (providerFine != null) {
locationManager.requestLocationUpdates(providerFine,
MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES,
this);
}
获取位置后，您可以检查最佳位置修复 下面给出了以下方法：http://developer.android.com/guide/topics/location/strategies.html
private static final int TWO_MINUTES = 1000 * 60 * 2;
/** Determines whether one Location reading is better than the current Location fix
* @param location The new Location that you want to evaluate
* @param currentBestLocation The current Location fix, to which you want to compare the new one
*/
protected boolean isBetterLocation(Location location, Location currentBestLocation) {
if (currentBestLocation == null) {
// A new location is always better than no location
return true;
}
// Check whether the new location fix is newer or older
long timeDelta = location.getTime() - currentBestLocation.getTime();
boolean isSignificantlyNewer = timeDelta > TWO_MINUTES;
boolean isSignificantlyOlder = timeDelta < -TWO_MINUTES;
boolean isNewer = timeDelta > 0;
// If it's been more than two minutes since the current location, use the new location
// because the user has likely moved
if (isSignificantlyNewer) {
return true;
// If the new location is more than two minutes older, it must be worse
} else if (isSignificantlyOlder) {
return false;
}
// Check whether the new location fix is more or less accurate
int accuracyDelta = (int) (location.getAccuracy() - currentBestLocation.getAccuracy());
boolean isLessAccurate = accuracyDelta > 0;
boolean isMoreAccurate = accuracyDelta < 0;
boolean isSignificantlyLessAccurate = accuracyDelta > 200;
// Check if the old and new location are from the same provider
boolean isFromSameProvider = isSameProvider(location.getProvider(),
currentBestLocation.getProvider());
// Determine location quality using a combination of timeliness and accuracy
if (isMoreAccurate) {
return true;
} else if (isNewer && !isLessAccurate) {
return true;
} else if (isNewer && !isSignificantlyLessAccurate && isFromSameProvider) {
return true;
}
return false;
}
/** Checks whether two providers are the same */
private boolean isSameProvider(String provider1, String provider2) {
if (provider1 == null) {
return provider2 == null;
}
return provider1.equals(provider2);
}