对于Android API级别(23),我们需要检查权限。
https://developer.android.com/training/permissions/requesting.html
我遇到了同样的问题,但是以下问题对我有用,并且我能够成功检索位置数据:
(1)确保您具有清单中列出的权限:
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
(2)确保您请求用户权限:
if ( ContextCompat.checkSelfPermission( this, android.Manifest.permission.ACCESS_COARSE_LOCATION ) != PackageManager.PERMISSION_GRANTED ) {
ActivityCompat.requestPermissions( this, new String[] { android.Manifest.permission.ACCESS_COARSE_LOCATION },
LocationService.MY_PERMISSION_ACCESS_COURSE_LOCATION );
}
(3)确保使用ContextCompat,因为它与较旧的API级别兼容。
(4)在您的位置服务或初始化LocationManager并获取最后一个已知位置的类中,我们需要检查权限:
if ( Build.VERSION.SDK_INT >= 23 &&
ContextCompat.checkSelfPermission( context, android.Manifest.permission.ACCESS_FINE_LOCATION ) != PackageManager.PERMISSION_GRANTED &&
ContextCompat.checkSelfPermission( context, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return ;
}
(5)只有在initLocationService方法的顶部包含@TargetApi(23)后,此方法才对我有用。
(6)我也将此添加到了我的gradle版本中:
compile 'com.android.support:support-v4:23.0.1'
这是我的LocationService供参考:
public class LocationService implements LocationListener {
//The minimum distance to change updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 0; // 10 meters
//The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 0;//1000 * 60 * 1; // 1 minute
private final static boolean forceNetwork = false;
private static LocationService instance = null;
private LocationManager locationManager;
public Location location;
public double longitude;
public double latitude;
/**
* Singleton implementation
* @return
*/
public static LocationService getLocationManager(Context context) {
if (instance == null) {
instance = new LocationService(context);
}
return instance;
}
/**
* Local constructor
*/
private LocationService( Context context ) {
initLocationService(context);
LogService.log("LocationService created");
}
/**
* Sets up location service after permissions is granted
*/
@TargetApi(23)
private void initLocationService(Context context) {
if ( Build.VERSION.SDK_INT >= 23 &&
ContextCompat.checkSelfPermission( context, android.Manifest.permission.ACCESS_FINE_LOCATION ) != PackageManager.PERMISSION_GRANTED &&
ContextCompat.checkSelfPermission( context, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return ;
}
try {
this.longitude = 0.0;
this.latitude = 0.0;
this.locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
// Get GPS and network status
this.isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
this.isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (forceNetwork) isGPSEnabled = false;
if (!isNetworkEnabled && !isGPSEnabled) {
// cannot get location
this.locationServiceAvailable = false;
}
//else
{
this.locationServiceAvailable = true;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
if (locationManager != null) {
location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
updateCoordinates();
}
}//end if
if (isGPSEnabled) {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
if (locationManager != null) {
location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
updateCoordinates();
}
}
}
} catch (Exception ex) {
LogService.log( "Error creating location service: " + ex.getMessage() );
}
}
@Override
public void onLocationChanged(Location location) {
// do stuff here with location object
}
}
到目前为止,我仅使用Android Lollipop设备进行了测试。希望这对您有用。