从应用程序提示启用 gps 后如何刷新并获取当前位置?
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【中文标题】从应用程序提示启用 gps 后如何刷新并获取当前位置?【英文标题】:After enable gps from an app prompt how to refresh and get the current location? 【发布时间】:2018-03-01 11:00:48 【问题描述】:我目前正在开发一个 android 应用程序,它会在 GPS 未打开时提示用户启用 GPS,为此我使用了警报对话框。在我从设置中启用 GPS 并按返回按钮返回我的应用程序后,toast 消息显示 0.00,0.00。虽然如果我在运行应用程序之前打开了 GPS,应用程序会正确显示我的位置。我想知道在启用 GPS 目的后使用哪种方法刷新用户位置。任何相关文章都会有帮助。
这是我的 GPS 课
public class GpsTracker extends Service implements LocationListener
private final Context mContext;
// flag for GPS status
boolean isGPSEnabled = false;
// flag for network status
boolean isNetworkEnabled = false;
// flag for GPS status
boolean canGetLocation = false;
Location location; // location
double latitude; // latitude
double longitude; // longitude
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
// Declaring a Location Manager
protected LocationManager locationManager;
public GpsTracker(Context context)
this.mContext = context;
getLocation();
public Location getLocation()
try
locationManager = (LocationManager) mContext
.getSystemService(LOCATION_SERVICE);
// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled)
// no network provider is enabled
else
if (ActivityCompat.checkSelfPermission(mContext,
Manifest.permission.ACCESS_FINE_LOCATION) !=
PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(mContext,
Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)
return null;
this.canGetLocation = true;
// First get location from Network Provider
if (isNetworkEnabled)
/* locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);*/
Log.d("Network", "Network");
if (locationManager != null)
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null)
latitude = location.getLatitude();
longitude = location.getLongitude();
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled)
if (location == null)
if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)
return null;
/* locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);*/
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null)
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null)
latitude = location.getLatitude();
longitude = location.getLongitude();
catch (Exception e)
e.printStackTrace();
return location;
/**
* Stop using GPS listener
* Calling this function will stop using GPS in your app
* */
public void stopUsingGPS()
if(locationManager != null)
if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)
return ;
locationManager.removeUpdates(GpsTracker.this);
/**
* Function to get latitude
* */
public double getLatitude()
if(location != null)
latitude = location.getLatitude();
// return latitude
return latitude;
/**
* Function to get longitude
* */
public double getLongitude()
if(location != null)
longitude = location.getLongitude();
// return longitude
return longitude;
/**
* Function to check GPS/wifi enabled
* @return boolean
* */
public boolean canGetLocation()
return this.canGetLocation;
/**
* Function to show settings alert dialog
* On pressing Settings button will lauch Settings Options
* */
public void showSettingsAlert()
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
// Setting Dialog Title
alertDialog.setTitle("GPS is settings");
// Setting Dialog Message
alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");
// On pressing Settings button
alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener()
public void onClick(DialogInterface dialog, int which)
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
);
// on pressing cancel button
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener()
public void onClick(DialogInterface dialog, int which)
dialog.cancel();
);
// Showing Alert Message
alertDialog.show();
@Override
public void onLocationChanged(Location location)
@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;
【问题讨论】:
选中此项以提示用户位置:***.com/questions/40142331/… 【参考方案1】:试试这个我也面临这个问题。
你必须reload your activity
之后就可以得到location
gps tracker class
中取boolean
如果你想enable or
disable
Gps
,请确保alert is in try catch to avoid crash
。
public class GpsTracker extends Service implements LocationListener
private final Context mContext;
public static boolean isFromSetting=false;
// flag for GPS status
boolean isGPSEnabled = false;
// flag for network status
boolean isNetworkEnabled = false;
// flag for GPS status
boolean canGetLocation = false;
Location location; // location
double latitude; // latitude
double longitude; // longitude
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10
meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
// Declaring a Location Manager
protected LocationManager locationManager;
public GpsTracker(Context context)
this.mContext = context;
getLocation();
public Location getLocation()
try
locationManager = (LocationManager) mContext
.getSystemService(LOCATION_SERVICE);
// getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled)
// no network provider is enabled
else
if (ActivityCompat.checkSelfPermission(mContext,
Manifest.permission.ACCESS_FINE_LOCATION) !=
PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(mContext,
Manifest.permission.ACCESS_COARSE_LOCATION) !=
PackageManager.PERMISSION_GRANTED)
return null;
this.canGetLocation = true;
// First get location from Network Provider
if (isNetworkEnabled)
/* locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);*/
Log.d("Network", "Network");
if (locationManager != null)
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null)
latitude = location.getLatitude();
longitude = location.getLongitude();
// if GPS Enabled get lat/long using GPS Services
if (isGPSEnabled)
if (location == null)
if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)
return null;
/* locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);*/
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null)
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null)
latitude = location.getLatitude();
longitude = location.getLongitude();
catch (Exception e)
e.printStackTrace();
return location;
/**
* Stop using GPS listener
* Calling this function will stop using GPS in your app
* */
public void stopUsingGPS()
if(locationManager != null)
if (ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(mContext, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)
return ;
locationManager.removeUpdates(GpsTracker.this);
/**
* Function to get latitude
* */
public double getLatitude()
if(location != null)
latitude = location.getLatitude();
// return latitude
return latitude;
/**
* Function to get longitude
* */
public double getLongitude()
if(location != null)
longitude = location.getLongitude();
// return longitude
return longitude;
/**
* Function to check GPS/wifi enabled
* @return boolean
* */
public boolean canGetLocation()
return this.canGetLocation;
/**
* Function to show settings alert dialog
* On pressing Settings button will lauch Settings Options
* */
public void showSettingsAlert()
try
AlertDialog.Builder alertDialog = new
AlertDialog.Builder(mContext);
// Setting Dialog Title
alertDialog.setTitle("GPS is settings");
// Setting Dialog Message
alertDialog.setMessage("GPS is not enabled. Do you want to go
to settings menu?");
// On pressing Settings button
alertDialog.setPositiveButton("Settings", new
DialogInterface.OnClickListener()
public void onClick(DialogInterface dialog, int which)
Intent intent = new
Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
isFromSetting = true;
mContext.startActivity(intent);
);
// on pressing cancel button
alertDialog.setNegativeButton("Cancel", new
DialogInterface.OnClickListener()
public void onClick(DialogInterface dialog, int which)
dialog.cancel();
);
// Showing Alert Message
alertDialog.show();
catch(Exception e)e.printstacktrace
@Override
public void onLocationChanged(Location location)
@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;
在你
MainActivity.java
这样做
@Override
protected void onResume()
super.onResume();
if (GPSTracker.isFromSetting==true)
finish();
startActivity(getIntent());
GPSTracker.isFromSetting=false;
@Override
public void onBackPressed()
super.onBackPressed();
if (GPSTracker.isFromSetting==true)
finish();
startActivity(getIntent());
GPSTracker.isFromSetting=false;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
gps = new GPSTracker(LoginActivity.this);
if(gps.canGetLocation())
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
Log.e("55",""+latitude);
Log.e("56",""+longitude);
Toast.makeText(getApplicationContext(), "Your Location is - \nLat: "
+ latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();
else
gps.showSettingsAlert();
很高兴为您提供帮助:)
【讨论】:
【参考方案2】:启用 GPS 后使用以下代码获取当前位置;
public class MainActivity extends AppCompatActivity implements LocationListener,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener, OnMapReadyCallback
final String TAG = "GPS";
GoogleMap googleMap;
Marker mCurrLocationMarker;
private long UPDATE_INTERVAL = 2 * 1000; /* 10 secs */
private long FASTEST_INTERVAL = 2000; /* 2 sec */
static final int MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION = 1;
private static final int GPS_CHECK = 112;
GoogleApiClient gac;
LocationRequest locationRequest;
TextView tvLatitude, tvLongitude, tvTime;
LocationManager locationManager;
Button capture;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvLatitude = (TextView) findViewById(R.id.tvLatitude);
tvLongitude = (TextView) findViewById(R.id.tvLongitude);
tvTime = (TextView) findViewById(R.id.tvTime);
capture = (Button) findViewById(R.id.capture);
isGooglePlayServicesAvailable();
// if (!isLocationEnabled())
// showAlert();
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
if (!locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER))
showAlert();
locationRequest = new LocationRequest();
locationRequest.setInterval(UPDATE_INTERVAL);
locationRequest.setFastestInterval(FASTEST_INTERVAL);
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
gac = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
SupportMapFragment mapFragment = (SupportMapFragment)
getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
@Override
protected void onStart()
gac.connect();
super.onStart();
@Override
protected void onStop()
gac.disconnect();
super.onStop();
@Override
public void onLocationChanged(Location location)
if (location != null)
updateUI(location);
@Override
public void onConnected(@Nullable Bundle bundle)
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION)
!= PackageManager.PERMISSION_GRANTED)
ActivityCompat.requestPermissions(MainActivity.this,
new String[]Manifest.permission.ACCESS_FINE_LOCATION,
MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION);
return;
Log.d(TAG, "onConnected");
Location ll = LocationServices.FusedLocationApi.getLastLocation(gac);
Log.d(TAG, "LastLocation: " + (ll == null ? "NO LastLocation" : ll.toString()));
updateUI(ll);
LocationServices.FusedLocationApi.requestLocationUpdates(gac, locationRequest, this);
@Override
public void onRequestPermissionsResult(
int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults)
switch (requestCode)
case MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION:
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
Toast.makeText(MainActivity.this, "Permission was granted!", Toast.LENGTH_LONG).show();
try
LocationServices.FusedLocationApi.requestLocationUpdates(
gac, locationRequest, this);
catch (SecurityException e)
Toast.makeText(MainActivity.this, "SecurityException:\n" + e.toString(), Toast.LENGTH_LONG).show();
else
Toast.makeText(MainActivity.this, "Permission denied!", Toast.LENGTH_LONG).show();
return;
@Override
public void onConnectionSuspended(int i)
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult)
Toast.makeText(MainActivity.this, "onConnectionFailed: \n" + connectionResult.toString(),
Toast.LENGTH_LONG).show();
Log.d("DDD", connectionResult.toString());
private void updateUI(Location loc)
Log.d(TAG, "updateUI");
try
tvLatitude.setText(Double.toString(loc.getLatitude()));
tvLongitude.setText(Double.toString(loc.getLongitude()));
tvTime.setText(DateFormat.getTimeInstance().format(loc.getTime()));
double lattitude = loc.getLatitude();
double longitude = loc.getLongitude();
//Place current location marker
LatLng latLng = new LatLng(lattitude, longitude);
if(mCurrLocationMarker!=null)
mCurrLocationMarker.setPosition(latLng);
else
mCurrLocationMarker = googleMap.addMarker(new MarkerOptions()
.position(latLng)
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED))
.title("I am here"));
googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng, 18));
googleMap.getUiSettings().setZoomControlsEnabled(true);
catch (Exception e)
private boolean isLocationEnabled()
LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
return locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER) ||
locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
private boolean isGooglePlayServicesAvailable()
final int PLAY_SERVICES_RESOLUTION_REQUEST = 9000;
GoogleApiAvailability apiAvailability = GoogleApiAvailability.getInstance();
int resultCode = apiAvailability.isGooglePlayServicesAvailable(this);
if (resultCode != ConnectionResult.SUCCESS)
if (apiAvailability.isUserResolvableError(resultCode))
apiAvailability.getErrorDialog(this, resultCode, PLAY_SERVICES_RESOLUTION_REQUEST)
.show();
else
Log.d(TAG, "This device is not supported.");
finish();
return false;
Log.d(TAG, "This device is supported.");
return true;
private void showAlert()
final AlertDialog.Builder dialog = new AlertDialog.Builder(this);
dialog.setTitle("Enable Location")
.setMessage("Your Locations Settings is set to 'Off'.\nPlease Enable Location to " +
"use this app")
.setPositiveButton("Location Settings", new DialogInterface.OnClickListener()
@Override
public void onClick(DialogInterface paramDialogInterface, int paramInt)
startActivityForResult(new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS), GPS_CHECK);
)
.setNegativeButton("Cancel", new DialogInterface.OnClickListener()
@Override
public void onClick(DialogInterface paramDialogInterface, int paramInt)
);
dialog.show();
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == GPS_CHECK)
if (!locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER))
capture.setVisibility(View.GONE);
Toast.makeText(getApplicationContext(), "Please turn on gps...", Toast.LENGTH_SHORT).show();
Log.e("BBBBBBBBBBBBBBB", "");
else
gac.connect();
googleMap.setOnMyLocationButtonClickListener(new GoogleMap.OnMyLocationButtonClickListener()
@Override
public boolean onMyLocationButtonClick()
try
Location myLocation = googleMap.getMyLocation();
onLocationChanged(myLocation);
catch (Exception e)
Log.getStackTraceString(e);
return false;
);
@Override
public void onMapReady(GoogleMap map)
googleMap = map;
map.setMapType(GoogleMap.MAP_TYPE_NORMAL);
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.
return;
map.setMyLocationEnabled(true);
map.setTrafficEnabled(true);
map.setIndoorEnabled(true);
map.setBuildingsEnabled(true);
map.getUiSettings().setZoomControlsEnabled(true);
【讨论】:
【参考方案3】:您可以在某个时间间隔内使用线程或服务,并在该线程或服务中获得 lat long。像这样的东西。
mHandler=new Handler();
mRunnable=new Runnable()
@Override
public void run() get your lat long here
mHandler.postDelayed(this,DELAY_TIME);
;
mHandler.postDelayed(mRunnable,DELAY_TIME);
【讨论】:
【参考方案4】:使用 on resume 标志返回活动后,尝试重新创建活动,然后在 oncreate() 中使用延迟,这对我来说效果很好。 在返回活动后创建我使用下面的代码。
final Handler handler = new Handler();
handler.postDelayed(new Runnable()
@Override
public void run()
// Do something after 5s = 5000ms
gps = new GPSTracker(MainActivity.this);
if(gps.canGetLocation())
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
sessionDepth = 0;
// \n is for new line
Toast.makeText(getApplicationContext(), "Your Location
is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();
, 4000);
【讨论】:
【参考方案5】:另一种更好的方法是使用广播监听器SO solution provided here。 看看,让我知道。
【讨论】:
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