在尝试使用位置许可（许可请求已生效）之后，我试图提示用户某种对话框以启用GPS或不启用GPS。我究竟做错了什么？从官方文档和一些StackOverflow答案中，我编写了以下代码：
public class Indicazioni extends WearableActivity {
private static final int REQUEST_CHECK_SETTINGS = 0x1;
private GoogleApiClient googleApiClient;
private boolean wearableConnected = false;
private FusedLocationProviderClient fusedLocationClient;
protected static final int REQUEST_LOCATION = 2;
private TextView text1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_indicazioni);
text1 = findViewById(R.id.text1);
text1.setVisibility(View.GONE);
// Enables Always-on
setAmbientEnabled();
//Se non ha il gps integrato, questa funzione non è disponibile
//Check if there is builtin gps
if (!hasGps()) {
Log.d("Gps_HW_Error", "This hardware doesn't have GPS.");
// Fall back to functionality that does not use location or
// warn the user that location function is not available.
Toast.makeText(this, "Gps integrato non rilevato, questa funzionalità è disattivata", Toast.LENGTH_LONG).show();
Intent i = new Intent(this, MainActivity.class);
startActivity(i);
finish();
}
//Se ha il gps integrato
//if yes
else {
fusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
//Verifico i permessi per leggere la posizione
//Check location permission
if (ActivityCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// 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.
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_LOCATION);
} else {
//Creo una richiesta di configurazione gps
LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder()
.addLocationRequest(createLocationRequest());
builder.setAlwaysShow(true);
//Controllo se le condizioni della configurazione gps sono soddisfatte
SettingsClient client = LocationServices.getSettingsClient(this);
Task<LocationSettingsResponse> task = client.checkLocationSettings(builder.build());
task.addOnCompleteListener(new OnCompleteListener<LocationSettingsResponse>() {
@Override
public void onComplete(Task<LocationSettingsResponse> task) {
try {
LocationSettingsResponse response = task.getResult(ApiException.class);
// All location settings are satisfied. The client can initialize location
// requests here.
fusedLocationClient.getLastLocation()
.addOnSuccessListener(Indicazioni.this, location -> {
// Got last known location. In some rare situations this can be null.
if (location != null) {
// Logic to handle location object
double x = location.getLatitude();
double y = location.getLongitude();
//TODO verifica la correttezza dei dati x e d y
//TODO cercare le fermate più vicine a questa coordinate
System.out.print(x + ", " + y);
}
});
} catch (ApiException exception) {
/*MY PROBLEM IS HERE*/
switch (exception.getStatusCode()) {
case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
// Location settings are not satisfied. But could be fixed by showing the
// user a dialog.
try {
// Cast to a resolvable exception.
ResolvableApiException resolvable = (ResolvableApiException) exception;
// Show the dialog by calling startResolutionForResult(),
// and check the result in onActivityResult().
resolvable.startResolutionForResult(
Indicazioni.this,
REQUEST_CHECK_SETTINGS);
} catch (IntentSender.SendIntentException e) {
// Ignore the error.
} catch (ClassCastException e) {
// Ignore, should be an impossible error.
}
break;
case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
// Location settings are not satisfied. However, we have no way to fix the
// settings so we won't show the dialog.
break;
}
}
}
});
}
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
final LocationSettingsStates states = LocationSettingsStates.fromIntent(getIntent());
switch (requestCode) {
case REQUEST_CHECK_SETTINGS:
switch (resultCode) {
case Activity.RESULT_OK:
// All required changes were successfully made ...
// ***REQUEST LAST LOCATION HERE***
Intent i = new Intent(this, Indicazioni.class);
startActivity(i);
finish();
break;
case Activity.RESULT_CANCELED:
// The user was asked to change settings, but chose not to ...
break;
default:
break;
}
break;
}
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults){
switch (requestCode) {
case REQUEST_LOCATION: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted, yay! Do the
// contacts-related task you need to do.
Intent intent = new Intent(this, Indicazioni.class);
startActivity(intent);
finish();
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
Toast.makeText(this, "Il GPS è richiesto per utilizzare questa funzione", Toast.LENGTH_LONG).show();
Intent i = new Intent(this, MainActivity.class);
startActivity(i);
finish();
}
return;
}
// other 'case' lines to check for other
// permissions this app might request.
}
}
private boolean hasGps() {
return getPackageManager().hasSystemFeature(PackageManager.FEATURE_LOCATION_GPS);
}
protected LocationRequest createLocationRequest() {
LocationRequest locationRequest = LocationRequest.create();
locationRequest.setInterval(10000); //Ogni quanti ms ricevere update
locationRequest.setFastestInterval(5000); //Massimo intervallo in ms che l'app riesce a gestire
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
return locationRequest;
}
}
也许错误在交换机“ switch（exception.getStatusCode（））”中，因为状态代码不存在（错误“在此平台上未实现”）