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我目前有一項服務，用於獲取用戶位置。我附加了很多活動，所以如果有任何活動需要獲取用戶的位置，他們只需調用此服務即可執行任務並將位置發送到活動。我面臨的問題是，在運行時請求許可的棉花糖條件下，我不知道如何完成這項工作。在這裏看到了一些關於堆棧溢出的例子，但它們主要針對活動而不是服務，我仍然無法弄清楚。 需要幫助搞清楚。下面是我的服務級別，並試圖找出它服務的Android運行時位置權限
public class GPSService extends Service implements LocationListener {
// saving the context for later use
private final Context mContext;
// if GPS is enabled
boolean isGPSEnabled = false;
// if Network is enabled
boolean isNetworkEnabled = false;
// if Location co-ordinates are available using GPS or Network
public boolean isLocationAvailable = false;
// Location and co-ordinates coordinates
Location mLocation;
double mLatitude;
double mLongitude;
// Minimum time fluctuation for next update (in milliseconds)
private static final long TIME = 300;
// Minimum distance fluctuation for next update (in meters)
private static final long DISTANCE = 20;
// Declaring a Location Manager
protected LocationManager mLocationManager;
public GPSService(Context context) {
this.mContext = context;
mLocationManager = (LocationManager) mContext
.getSystemService(LOCATION_SERVICE);
}
/**
* Returs the Location
*
* @return Location or null if no location is found
*/
public Location getLocation() {
try {
// Getting GPS status
isGPSEnabled = mLocationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// If GPS enabled, get latitude/longitude using GPS Services
if (isGPSEnabled) {
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
mLocationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER, TIME, DISTANCE, this);
if (mLocationManager != null) {
mLocation = mLocationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (mLocation != null) {
mLatitude = mLocation.getLatitude();
mLongitude = mLocation.getLongitude();
isLocationAvailable = true; // setting a flag that
// location is available
return mLocation;
}
}
}
// If we are reaching this part, it means GPS was not able to fetch
// any location
// Getting network status
isNetworkEnabled = mLocationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (isNetworkEnabled) {
mLocationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, TIME, DISTANCE, this);
if (mLocationManager != null) {
mLocation = mLocationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (mLocation != null) {
mLatitude = mLocation.getLatitude();
mLongitude = mLocation.getLongitude();
isLocationAvailable = true; // setting a flag that
// location is available
return mLocation;
}
}
}
// If reaching here means, we were not able to get location neither
// from GPS not Network,
if (!isGPSEnabled) {
// so asking user to open GPS
askUserToOpenGPS();
}
}
}catch(Exception e){
e.printStackTrace();
}
// if reaching here means, location was not available, so setting the
// flag as false
isLocationAvailable = false;
return null;
}
/**
* Gives you complete address of the location
*
* @return complete address in String
*/
public String getLocationAddress() {
if (isLocationAvailable) {
Geocoder geocoder = new Geocoder(mContext, Locale.getDefault());
// Get the current location from the input parameter list
// Create a list to contain the result address
List<Address> addresses = null;
try {
/*
* Return 1 address.
*/
addresses = geocoder.getFromLocation(mLatitude, mLongitude, 1);
} catch (IOException e1) {
e1.printStackTrace();
return ("IO Exception trying to get address:" + e1);
} catch (IllegalArgumentException e2) {
// Error message to post in the log
String errorString = "Illegal arguments "
+ Double.toString(mLatitude) + " , "
+ Double.toString(mLongitude)
+ " passed to address service";
e2.printStackTrace();
return errorString;
}
// If the reverse geocode returned an address
if (addresses != null && addresses.size() > 0) {
// Get the first address
Address address = addresses.get(0);
/*
* Format the first line of address (if available), city, and
* country name.
*/
String addressText = String.format(
"%s, %s, %s,%s",
// If there's a street address, add it
address.getMaxAddressLineIndex() > 0 ? address
.getAddressLine(0) : "",
// Locality is usually a city
address.getLocality(),
address.getAdminArea(),
// The country of the address
address.getCountryName());
// Return the text
return addressText;
} else {
return getString(R.string.no_address_gpsservice);
}
} else {
return getString(R.string.loc_unavaliable);
}
}
/**
* get latitude
*
* @return latitude in double
*/
public double getLatitude() {
if (mLocation != null) {
mLatitude = mLocation.getLatitude();
}
return mLatitude;
}
/**
* get longitude
*
* @return longitude in double
*/
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
switch (requestCode) {
case 1: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
}
return;
}
// other 'case' lines to check for other
// permissions this app might request
}
}
public double getLongitude() {
if (mLocation != null) {
mLongitude = mLocation.getLongitude();
}
return mLongitude;
}
/**
* close GPS to save battery
*/
public void closeGPS() {
if (mLocationManager != null) {
mLocationManager.removeUpdates(GPSService.this);
}
}
/**
* show settings to open GPS
*/
public void askUserToOpenGPS() {
AlertDialog.Builder mAlertDialog = new AlertDialog.Builder(mContext);
// Setting Dialog Title
mAlertDialog.setTitle(R.string.gpsservice_dialog_title)
.setMessage(R.string.gpsservice_dialog_message)
.setPositiveButton(R.string.gpsservice_dialog_positive, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
})
.setNegativeButton(R.string.gpsservice_dialog_negative,new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
}).show();
}
/**
* Updating the location when location changes
*/
@Override
public void onLocationChanged(Location location) {
mLatitude = location.getLatitude();
mLongitude = location.getLongitude();
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public IBinder onBind(Intent arg0) {
return null;
}
}
活動需要檢查的運行權限，並要求對他們來說，啓動或綁定到服務之前請求許可。 – CommonsWare
好吧讓我試試這個 – henry
我是否必須在所有活動中要求它，我可以只需要它一次，它涵蓋了其餘的部分 – henry