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Android 如何获取设备的当前位置？谷歌地图

android google-maps localization geolocation

Android 如何获取设备的当前位置？谷歌地图,android,google-maps,localization,geolocation,google-maps-android-api-2,Android,Google Maps,Localization,Geolocation,Google Maps Android Api 2,我需要知道当我点击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，标记被放置在当前位置，我看到了许多视频和教程，但没有一个有效或过时等 有关守则： onCreate: @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_add); m

我需要知道当我点击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，标记被放置在当前位置，我看到了许多视频和教程，但没有一个有效或过时等

有关守则：

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();
    }

}       

  @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);

        }
    });
   }
onMapReady:

   @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();
    }

}       

  @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) {

}
需要GPS服务来获取当前位置的纬度和经度

Android定位API将为您提供融合定位功能。检查以下链接以更好地理解

  • 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();
}
    要使用map，您必须按照以下步骤进行配置

    1-在google开发者控制台创建一个项目

    2-选择项目，左侧菜单将显示凭证选项单击它，然后您将获得选项创建凭证单击它，然后它将要求创建api密钥单击并创建我们的项目api密钥。

    3单击仪表板并选择屏幕顶部的项目，您将获得启用api的选项。

    4-在这里，您将看到许多谷歌api，在谷歌地图api部分，选择谷歌地图api android并单击启用。

    现在，您将获得一个可工作的api密钥此api密钥用于与map一起工作，这里我将为您提供我的存储库，您可以从中获取示例。您不需要配置api密钥，因为我正在其中使用api密钥。
    如果您想使用自己的api密钥，那么只需要更新manifiest文件元数据标记内项目中的api密钥

    首先将此权限添加到清单中

    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    对于Android N+，您需要在运行时检查权限在onCreate中检查此项：

       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中检查是否授予了权限：

     @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中：

      @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start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（）），请在需要其他操作时更改它

    通过这种方法，你不需要GMap就能获得位置，并且可以手动在地图上显示这个位置

    我希望有用：）

    谢谢我会看到的第一个链接是不完整的教程LocationServices.API，没有发现必须使用此库-编译'com.google.android.gms:play services:6.5.87'我在firebase中使用10.0.2，这不会导致异常？