我想检查GPS是否打开，如果它应该显示当前位置。如果没有，它应该要求打开它。如果用户单击取消或不转动，坐标将设置为基本。不幸的是总是选择基本的。即使GPS是（我没有得到打开GPS的消息）
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
locationManagerr = (LocationManager) getSystemService(LOCATION_SERVICE);
currentLocation=new Location("location");
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION,
Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.INTERNET}
, 10);
}
}else
getLocation();
log.i(TAG,"latitude "+currentLocation.getLatitude());
}
private Location getLocation(){
locationListener= new LocationListener() {
@Override
public void onLocationChanged(Location location) {
currentLocation=location;
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(LocationFinder.this);
alertDialogBuilder.setMessage("GPS is off. Want to turn on GPS?")
.setCancelable(false)
.setPositiveButton("Turn On",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Intent callGPSSettingIntent = new Intent(
android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(callGPSSettingIntent);
}
});
alertDialogBuilder.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
currentLocation=setStartCoordinate();
dialog.cancel();
}
});
AlertDialog alert = alertDialogBuilder.create();
alert.show();
}
};
return currentLocation;
}
private Location setStartCoordinate(){
Location primaryLocalization= new Location("Basic");
primaryLocalization.setLongitude(0);
primaryLocalization.setLatitude(0);
return primaryLocalization;
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
switch (requestCode){
case 10:
try{
getLocation();
log.i(TAG,"latitude "+currentLocation.getLatitude());
}
catch (SecurityException ex){log.i(TAG,"security error");}
break;
default:
break;
}
}
答案 0 :(得分：2)
以下代码检查是否启用了位置。如果没有，则显示警报对话框以启用位置服务。
LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
try {
gps_enabled = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
}catch (Exception ex){}
try{
network_enabled = lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
}catch (Exception ex){}
if(!gps_enabled && !network_enabled){
AlertDialog.Builder dialog = new AlertDialog.Builder(this);
dialog.setMessage(getResources().getString(R.string.gps_network_not_enabled));
dialog.setPositiveButton(getResources().getString(R.string.open_location_settings), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface paramDialogInterface, int paramInt) {
Intent myIntent = new Intent( Settings.ACTION_LOCATION_SOURCE_SETTINGS);
Startup.this.startActivity(myIntent);
}
});
dialog.setNegativeButton(getString(R.string.Cancel), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface paramDialogInterface, int paramInt) {
// TODO Auto-generated method stub
}
});
dialog.show();
}
在AndroidManifest.xml中添加以下代码
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
答案 1 :(得分：1)
这需要大量的案例处理，我提供了您所要求的所有功能的完整实现，并在下面进行了简要说明。
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
compile 'com.google.android.gms:play-services-location:9.2.1'
public class GPSStatusReceiver extends BroadcastReceiver {
private GpsStatusChangeListener mCallback;
private Context mContext;
public GPSStatusReceiver(Context context, GpsStatusChangeListener callback) {
mCallback = callback;
mContext = context;
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("android.location.PROVIDERS_CHANGED");
intentFilter.addCategory(Intent.CATEGORY_DEFAULT);
context.registerReceiver(this, intentFilter);
}
public void unRegisterReceiver(){
Log.d("ali", "unRegisterReceiver");
mContext.unregisterReceiver(this);
}
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().matches("android.location.PROVIDERS_CHANGED")) {
Log.d("ali", "in PROVIDERS_CHANGED");
mCallback.onGpsStatusChange();
}
}
public interface GpsStatusChangeListener{
void onGpsStatusChange();
}
}
public class GPSLocation implements
ConnectionCallbacks,
OnConnectionFailedListener,
LocationListener,
GPSStatusReceiver.GpsStatusChangeListener {
public static final int REQUEST_CHECK_SETTINGS = 100;
public static final int LOCATION_PERMISSION_REQUEST_CODE = 200;
private static final int PERMISSION_GRANTED = 0;
private static final int PERMISSION_DENIED = 1;
private static final int PERMISSION_BLOCKED = 2;
private GoogleApiClient mGoogleApiClient;
private Location mCurrentLocation;
private LocationCallback mCallback;
private Activity mActivity;
private Context mContext;
private LocationRequest mLocationRequest;
private GPSStatusReceiver mGPSStatusReceiver;
private long intervalMillis = 10000;
private long fastestIntervalMillis = 5000;
private int accuracy = LocationRequest.PRIORITY_HIGH_ACCURACY;
private boolean isInitialized = false;
private boolean isLocationEnabled = false;
private boolean isPermissionLocked = false;
public GPSLocation(Activity activity, LocationCallback callback) {
mActivity = activity;
mContext = activity.getApplicationContext();
mCallback = callback;
if (mGoogleApiClient == null) {
mGoogleApiClient = new GoogleApiClient.Builder(mContext)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
createLocationRequest();
mGPSStatusReceiver = new GPSStatusReceiver(mContext, this);
}
public void init(){
isInitialized = true;
if(mGoogleApiClient != null) {
if (mGoogleApiClient.isConnected()) {
requestPermission();
} else {
connect();
}
}
}
public void createLocationRequest() {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(intervalMillis);
mLocationRequest.setFastestInterval(fastestIntervalMillis);
mLocationRequest.setPriority(accuracy);
}
public LocationRequest getLocationRequest() {
return mLocationRequest;
}
public void connect(){
if(mGoogleApiClient != null && isInitialized) {
mGoogleApiClient.connect();
}
}
public void disconnect(){
if(mGoogleApiClient != null && isInitialized) {
mGoogleApiClient.disconnect();
}
}
private void getLastKnownLocation(){
if(!mGoogleApiClient.isConnected()){
Log.d("ali", "getLastKnownLocation restart ");
mGoogleApiClient.connect();
}
else {
if (checkLocationPermission(mContext) && isLocationEnabled) {
Log.d("ali", "getLastKnownLocation read ");
if(mCurrentLocation == null) {
mCurrentLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
mCallback.onLastKnowLocationFetch(mCurrentLocation);
}
startLocationUpdates();
}else{
Log.d("ali", "getLastKnownLocation get permission ");
requestPermission();
}
}
Log.d("ali", "mCurrentLocation " + mCurrentLocation);
}
public void startLocationUpdates() {
if(checkLocationPermission(mContext)
&& mGoogleApiClient != null
&& mGoogleApiClient.isConnected()
&& isLocationEnabled) {
LocationServices.FusedLocationApi.requestLocationUpdates(
mGoogleApiClient, mLocationRequest, this);
}
}
public void stopLocationUpdates() {
if(mGoogleApiClient != null
&& mGoogleApiClient.isConnected()) {
LocationServices.FusedLocationApi.removeLocationUpdates(
mGoogleApiClient, this);
}
}
@Override
public void onConnected(@Nullable Bundle bundle) {
Log.d("ali", "onConnected");
requestPermission();
}
@Override
public void onConnectionSuspended(int i) {
Log.d("ali", "onConnectionSuspended");
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
Log.d("ali", "onConnectionFailed");
}
@Override
public void onLocationChanged(Location location) {
Log.d("ali", "onLocationChanged : " + location);
mCallback.onLocationUpdate(location);
}
@Override
public void onGpsStatusChange() {
Log.d("ali", "onGpsStatusChange");
if(isInitialized && !isPermissionLocked) {
if (!isLocationEnabled(mContext)) {
isLocationEnabled = false;
isPermissionLocked = true;
stopLocationUpdates();
requestPermission();
}
}
}
private void requestPermission(){
if (ContextCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED){
String[] appPerm = new String[]{Manifest.permission.ACCESS_FINE_LOCATION};
ActivityCompat.requestPermissions(mActivity, appPerm, LOCATION_PERMISSION_REQUEST_CODE);
}else{
getLocationSetting();
}
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == GPSLocation.REQUEST_CHECK_SETTINGS) {
if (resultCode == Activity.RESULT_OK) {
getLastKnownLocation();
}else{
Toast.makeText(mContext, "Permission Denied", Toast.LENGTH_SHORT).show();
mCallback.onLocationSettingsError();
}
}
}
private void getLocationSetting(){
LocationSettingsRequest.Builder builder =
new LocationSettingsRequest
.Builder()
.addLocationRequest(mLocationRequest);
PendingResult<LocationSettingsResult> result =
LocationServices.SettingsApi.checkLocationSettings(mGoogleApiClient, builder.build());
result.setResultCallback(new ResultCallback<LocationSettingsResult>(){
@Override
public void onResult(LocationSettingsResult result) {
final Status status = result.getStatus();
final LocationSettingsStates locationSettingsStates = result.getLocationSettingsStates();
switch (status.getStatusCode()) {
case LocationSettingsStatusCodes.SUCCESS:
Log.d("ali", "SUCCESS");
isLocationEnabled = true;
isPermissionLocked = false;
getLastKnownLocation();
break;
case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
Log.d("ali", "RESOLUTION_REQUIRED");
try {
status.startResolutionForResult(
mActivity,
REQUEST_CHECK_SETTINGS);
} catch (IntentSender.SendIntentException e) {
e.printStackTrace();
mCallback.onLocationSettingsError();
}finally {
isPermissionLocked = false;
}
break;
case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
Log.d("ali", "SETTINGS_CHANGE_UNAVAILABLE");
Toast.makeText(mContext, "Location Unavailable", Toast.LENGTH_SHORT).show();
mCallback.onLocationSettingsError();
isPermissionLocked = false;
break;
}
}
});
}
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
int permState;
switch (requestCode) {
case LOCATION_PERMISSION_REQUEST_CODE:
if (grantResults.length > 0) {
if(grantResults[0] != PackageManager.PERMISSION_GRANTED) {
if(!ActivityCompat.shouldShowRequestPermissionRationale(
mActivity,
Manifest.permission.ACCESS_FINE_LOCATION)){
permState = PERMISSION_BLOCKED;
}else{permState = PERMISSION_DENIED;}
}else {permState = PERMISSION_GRANTED;}
}
else{permState = PERMISSION_DENIED;}
switch (permState){
case PERMISSION_BLOCKED:
Toast.makeText(mContext,"Please give gps location permission to use the app.",Toast.LENGTH_LONG).show();
startInstalledAppDetailsActivity(mContext);
mCallback.onLocationPermissionDenied();
break;
case PERMISSION_DENIED:
Toast.makeText(mContext,"Permission Denied, app cannot access the gps location.", Toast.LENGTH_LONG).show();
break;
case PERMISSION_GRANTED:
getLocationSetting();
break;
}
break;
}
}
public static boolean isLocationEnabled(Context context){
LocationManager locationManager = (LocationManager)context.getSystemService(Context.LOCATION_SERVICE);
boolean gpsEnabled = false;
boolean networkEnabled = false;
try {
gpsEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
} catch(Exception ex) {}
try {
networkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
} catch(Exception ex) {}
return gpsEnabled && networkEnabled;
}
public static void startInstalledAppDetailsActivity(final Context context) {
if (context == null) {
return;
}
final Intent i = new Intent();
i.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
i.addCategory(Intent.CATEGORY_DEFAULT);
i.setData(Uri.parse("package:" + context.getPackageName()));
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
i.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
i.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
context.startActivity(i);
}
public static boolean checkLocationPermission(Context context) {
String permission = "android.permission.ACCESS_FINE_LOCATION";
int res = context.checkCallingOrSelfPermission(permission);
return (res == PackageManager.PERMISSION_GRANTED);
}
public interface LocationCallback {
void onLastKnowLocationFetch(Location location);
void onLocationUpdate(Location location);
void onLocationPermissionDenied();
void onLocationSettingsError();
}
public void close() {
mGPSStatusReceiver.unRegisterReceiver();
}
}
public class MainActivity extends AppCompatActivity implements GPSLocation.LocationCallback {
private GPSLocation mGPSLocation;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mGPSLocation = new GPSLocation(this, this);
mGPSLocation.init();
}
@Override
public void onLastKnowLocationFetch(Location location) {
if(location != null) {
Log.d("ali ", "onLastKnowLocationFetch " + location);
}
}
@Override
public void onLocationUpdate(Location location) {
if(location != null) {
Log.d("ali ", "onLocationUpdate " + location);
}
}
@Override
public void onLocationPermissionDenied() {
}
@Override
public void onLocationSettingsError() {
}
@Override
protected void onStart() {
mGPSLocation.connect();
super.onStart();
}
@Override
public void onResume() {
super.onResume();
mGPSLocation.startLocationUpdates();
}
@Override
protected void onPause() {
super.onPause();
mGPSLocation.stopLocationUpdates();
}
@Override
protected void onStop() {
mGPSLocation.disconnect();
super.onStop();
}
@Override
protected void onDestroy() {
mGPSLocation.close();
super.onDestroy();
}
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if(requestCode == GPSLocation.LOCATION_PERMISSION_REQUEST_CODE) {
mGPSLocation.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == GPSLocation.REQUEST_CHECK_SETTINGS) {
mGPSLocation.onActivityResult(requestCode, resultCode, data);
}
}
}
答案 2 :(得分：0)
为我添加此覆盖方法，其工作正常 -
@Override
public void onLocationChanged(Location location) {
getLocation("onLocationChanged");
}