我需要知道点击我的地图时放置的标记的纬度和经度，我还需要知道如何实现，以便当我打开地图时，标记放在当前位置，我已经看过很多视频和教程，但都没有用，或者已经过时等等。
相关代码：
的onCreate：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add);
mPost = new Post();
initPantallaAdd();
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getApplicationContext());
if(status == ConnectionResult.SUCCESS){
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.mapAddUbicacion);
mapFragment.getMapAsync(this);
}else{
Toast.makeText(getApplicationContext(), "Please install google play services", Toast.LENGTH_SHORT).show();
}
}
onMapReady：
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
UiSettings uiSettings = mMap.getUiSettings();
uiSettings.setZoomControlsEnabled(true);
LatLng sydney = new LatLng(-0.193805, -78.467102);
CameraPosition cp = CameraPosition.builder().target(sydney).zoom(16).tilt(3).build();
float zoomlevel = 16;
mMap.moveCamera(CameraUpdateFactory.newCameraPosition(cp));
mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
@Override
public void onMapClick(LatLng latLng) {
mMap.clear();
MarkerOptions markerOptions = new MarkerOptions().position(new LatLng(latLng.latitude, latLng.longitude)).title("Selected point");
mMap.addMarker(markerOptions);
}
});
}
我实现了这些方法，但我不知道该怎么做：
//==============================================================================================
// ON CONNECTION CALLBACKS
@Override
public void onConnected(@Nullable Bundle bundle) {
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
//==============================================================================================
// LOCATION LISTENER
@Override
public void onLocationChanged(Location location) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
答案 0 :(得分：2)
首先将此权限添加到清单
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
将此类用于Handle GpsTrack：
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
public 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 {
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) {
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) {
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_Preview
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_Preview
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;
}
}
对于Android N +，您需要检查运行时权限，请在onCreate中检查：
private LatLng start = null; //currentLocation
GPSTracker gpsTracker;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);
LocationListener mLocationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
start = new LatLng(location.getLatitude(), location.getLongitude());
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
};
LocationManager mLocationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5000,
10, mLocationListener);
}
}
并在onResume中检查授予或不授权：
@Override
protected void onResume() {
super.onResume();
if (checkLocationPermission()) {
gpsTracker = new GPSTracker(this);
if (gpsTracker.canGetLocation) {
start = new LatLng(gpsTracker.getLatitude(), gpsTracker.getLongitude());
} else {
Toast.makeText(this, "please accept permission !!!!", Toast.LENGTH_SHORT).show();
finish();
}
}
}
检查权限方法：
public boolean checkLocationPermission() {
String permission = "android.permission.ACCESS_FINE_LOCATION";
int res = this.checkCallingOrSelfPermission(permission);
return (res == PackageManager.PERMISSION_GRANTED);
}
最后在onRequestPermissionsResult：
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
switch (requestCode) {
case 1: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
//Permission Granted
gpsTracker = new GPSTracker(this);
if (gpsTracker.canGetLocation) {
start = new LatLng(gpsTracker.getLatitude(), gpsTracker.getLongitude());
} 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
}
}
}
现在开始是设备的当前位置，并在位置更改时更新！
注意：如果用户拒绝权限活动未启动（finish（）），如果您需要其他操作，请更改它！
通过这种方法，您可以获得位置而无需GMap，并且可以在地图上手动显示此latlng。
我希望有用：）
答案 1 :(得分：1)
要使用地图，您必须按照一些步骤进行配置。
1-在google开发者控制台创建项目。 https://console.developers.google.com/
2-选择项目，左侧菜单将显示凭据选项点击它，然后您将获得选项创建凭证点击，而不是要求创建API密钥并创建我们的项目API密钥。
点击信息中心并点击屏幕顶部的项目，您将获得启用api的选项。
4-在这里你会有很多谷歌api，在谷歌地图api部分选择谷歌地图api android并点击启用。
现在你将获得一个工作的api密钥这个api密钥用于处理map 这里我给你的存储库你可以从中获取示例。你不需要为api键配置我正在使用我的api密钥。 如果你想使用你自己的api密钥，你只需要更新项目中最明显的文件元数据标签中的api密钥。 here is a working example
答案 2 :(得分：0)
需要GPS服务才能获得当前位置的纬度和经度。
Android位置API 将为您提供融合的位置功能。请查看以下链接以便更好地理解。
答案 3 :(得分：0)
查看此代码以获取当前的纬度和经度......
public class MerchantTrack extends Common implements
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener {
private final static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 9000;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.merchant_track);
backbuttn=(ImageView)findViewById(R.id.backbuttn);
getSupportActionBar().hide();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this).build();
connectClient();
}
protected void connectClient() {
// Connect the client.
if (isGooglePlayServicesAvailable() && mGoogleApiClient != null) {
mGoogleApiClient.connect();
}
}
private boolean isGooglePlayServicesAvailable() {
// Check that Google Play services is available
int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
// If Google Play services is available
if (ConnectionResult.SUCCESS == resultCode) {
// In debug mode, log the status
Log.d("Location Updates", "Google Play services is available.");
return true;
} else {
// Get the error dialog from Google Play services
Dialog errorDialog = GooglePlayServicesUtil.getErrorDialog(resultCode, this,
CONNECTION_FAILURE_RESOLUTION_REQUEST);
// If Google Play services can provide an error dialog
if (errorDialog != null) {
// Create a new DialogFragment for the error dialog
UberMapsActivity.ErrorDialogFragment errorFragment = new UberMapsActivity.ErrorDialogFragment();
errorFragment.setDialog(errorDialog);
errorFragment.show(getSupportFragmentManager(), "Location Updates");
}
return false;
}
}
@Override
public void onConnected(Bundle bundle) {
Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if (location != null) {
//Toast.makeText(this, "GPS location was found!", Toast.LENGTH_SHORT).show();
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
latitudE = location.getLatitude();
longitudE = location.getLongitude();
Log.d("locationnss", String.valueOf(latitudE));
new MerchLocAsync().execute();
} else {
new AlertDialog.Builder(MerchantTrack.this)
.setIcon(android.R.drawable.ic_dialog_alert)
.setMessage("Current location is unavailable!")
.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
})
.show();
}
startLocationUpdates();
}
protected void startLocationUpdates() {
mLocationRequest = new LocationRequest();
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient,
mLocationRequest, this);
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
}
@Override
public void onLocationChanged(Location location) {
}
@Override
public void onBackPressed() {
Intent home = new Intent(MerchantTrack.this,Home.class);
startActivity(home);
super.onBackPressed();
}