无法使用通用代码获取GPS位置 [英] Unable to get GPS Location with Common Code
问题描述
我有获取位置的代码,我相信它可以正常工作,但根本不起作用:
I have code to get location, which I believe must be working but it doesn't at all:
清单:
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
Java :
LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
0,
0,
new MyLocationListener()
);
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
String provider = locationManager.getBestProvider(criteria, true);
Location location = locationManager.getLastKnownLocation(provider);
System.out.println("location: " + location);
location打印null,并且监听器根本不会被调用.任何人都可以建议出什么问题了吗?如果我打开Google地图,它仍然可以返回我的位置.
location prints null and the listener never get called at all. Anyone can advise what's wrong? If I open Google Maps, it can return my location anyway.
注意:我正在用自己的设备进行测试
Note: I am testing with my device
推荐答案
在实用程序包中或任何适合使用以下代码的地方创建类SingleShotLocationProvider
.
Create Class SingleShotLocationProvider
in your utility package or wherever you are fine with below code.
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.widget.Toast;
public class SingleShotLocationProvider {
public interface LocationCallback {
void onNewLocationAvailable(Location location);
}
// calls back to calling thread, note this is for low grain: if you want higher precision, swap the
// contents of the else and if. Also be sure to check gps permission/settings are allowed.
// call usually takes <10ms
public static void requestSingleUpdate(final Context context, final LocationCallback callback) {
final LocationManager locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
if (Utility.checkAndRequestPermissionsForGPS(context)) {
if (ActivityCompat.checkSelfPermission(context, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(context, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
Toast.makeText(context, "First enable LOCATION ACCESS in settings.", Toast.LENGTH_LONG).show();
return;
}
boolean isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
if (isGPSEnabled) {
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
locationManager.requestSingleUpdate(criteria, new LocationListener() {
@Override
public void onLocationChanged(Location location) {
callback.onNewLocationAvailable(location);
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
}, null);
} else {
boolean isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (isNetworkEnabled) {
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_COARSE);
locationManager.requestSingleUpdate(criteria, new LocationListener() {
@Override
public void onLocationChanged(Location location) {
callback.onNewLocationAvailable(location);
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
}, null);
}
}
}
}
}
现在您在活动"中将其导入为
Now in you Activity import it like
import com.yourdomain.utils.SingleShotLocationProvider;
现在您可以像this
所示那样使用它来引用您的活动
Now you can use it like below this
is reference to your activity
SingleShotLocationProvider.requestSingleUpdate(this,
new SingleShotLocationProvider.LocationCallback() {
@Override
public void onNewLocationAvailable(Location location) {
if (location != null) {
double latitude = location.getLatitude();
double longitude = location.getLongitude();
}
}
}
});
您将首先尝试获得位置信息,只需确保GPS处于打开状态并设置为高精度即可.清单中,您已获得必要的许可,如下所示-
You will receive location in first attempt just make sure GPS is on and set to high accuracy.And in manifest you have given necessary permission as like below -
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
这篇关于无法使用通用代码获取GPS位置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!