实现思路：先通过 uni.getLocation 接口获取当前位置获取当前位置，再与点击经纬度进行计算得出相差距离。

1.获取当前位置

需要先在manifest.json配置文件开启获取位置权限

//获取当前位置
	getLocation() {
		let location = {
			lat: 0,
			lng: 0,
		}
		return new Promise((reserve, reject) => {//因为获取位置是异步接口所以需要使用promise
			uni.getLocation({
				success(res) {
					location.lat = res.latitude
					location.lng = res.longitude,
						reserve(location);
				},
				fail(err) {
					reject(location );//获取失败则返回经纬坐标为0
				}
			})
		})
	},

2.调用获取位置方法，计算距离

			//根据金纬度计算距离
			distance(lat1, lng1) {
				var that = this;
				console.log('计算地点经纬度：', lat1, lng1);

				this.$utils.getLocation().then((res) => {
					console.log('我的位置：', location);
					let lat2 = res.lat;
					let lng2 = res.lng;
					let rad1 = lat1 * Math.PI / 180.0;
					let rad2 = lat2 * Math.PI / 180.0;
					let a = rad1 - rad2;
					let b = lng1 * Math.PI / 180.0 - lng2 * Math.PI / 180.0;

					let s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2) + Math.cos(rad1) * Math.cos(
						rad2) * Math.pow(
						Math.sin(b / 2), 2)));
					s = s * 6378.137;
					s = Math.round(s * 10000) / 10000;
					s = s.toString();
					s = s.substring(0, s.indexOf('.') + 2);
					console.log('距离：', s);
					return s;//返回距离
				});
			},

效果图

Android 开发——获取位置

写作原因

因为这个部分网络上面涉及到的内容比较杂糅，所以我打算写一下，方便以后的开发学习小白少走一些弯路。

获取手机中所有可用的位置提供器

法一

LocationManager locationManager = (LocationManager)getSystemService(LOCATION_SERVICE);
List<String> providerNames = locationManager.getAllProviders();
StringBuilder stringBuilder = new StringBuilder();
for (Iterator<String> iterator = providerNames.iterator(); iterator.hasNext();){
     stringBuilder.append(iterator.next()+"\n");
    }
Log.e("location",stringBuilder.toString());

法二（此处选择了GPS定位）

LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
LocationProvider locationProvider = locationManager.getProvider(LocationManager.GPS_PROVIDER);
Log.e("Location",locationProvider.getName());

法三

此处为利用选择条件去获取你想要的位置提供器

LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
Criteria criteria = new Criteria();
criteria.setCostAllowed(false);
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setPowerRequirement(Criteria.POWER_LOW);
String provider = locationManager.getBestProvider(criteria,true);
Log.e("location",provider+"");

我的实现代码（仅供参考，不作解释）

onCreate内部内容

private String locationProvider;

        LocationManager locationManager = (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) {
            // 动态请求位置信息
            Toast.makeText(this,"GPS or NETWORK error",Toast.LENGTH_SHORT).show();
            ActivityCompat.requestPermissions(this,
                    new String[]{Manifest.permission.ACCESS_COARSE_LOCATION,Manifest.permission.ACCESS_FINE_LOCATION}, 1);
            return;
        }
        List<String> providers = locationManager.getProviders(true);
        if (providers.contains(LocationManager.GPS_PROVIDER)) {
            locationProvider = LocationManager.GPS_PROVIDER;
            Toast.makeText(this,"GPS",Toast.LENGTH_SHORT).show();
        }
        else if (providers.contains(LocationManager.NETWORK_PROVIDER)) {
            locationProvider = LocationManager.NETWORK_PROVIDER;
            Toast.makeText(this,"NETWORK",Toast.LENGTH_SHORT).show();
        }
        else if (providers.contains(LocationManager.PASSIVE_PROVIDER)){
            locationProvider = LocationManager.PASSIVE_PROVIDER;
            Toast.makeText(this,"PASSIVE",Toast.LENGTH_SHORT).show();
        }
        else {
            Toast.makeText(this,"请开启位置请求权限",Toast.LENGTH_SHORT).show();
            return;
        }

        locationManager.requestLocationUpdates(
                locationProvider,
                1000,
                1,
                new LocationListener() {
                    @Override
                    public void onLocationChanged(@NonNull Location location) {

                    }

                    @Override
                    public void onStatusChanged(String provider, int status, Bundle extras) {
                        LocationListener.super.onStatusChanged(provider, status, extras);
                    }

                    @Override
                    public void onProviderEnabled(@NonNull String provider) {
                        LocationListener.super.onProviderEnabled(provider);
                    }

                    @Override
                    public void onProviderDisabled(@NonNull String provider) {
                        LocationListener.super.onProviderDisabled(provider);
                    }
                }
        );
//        Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
//        Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
        Location location = locationManager.getLastKnownLocation(locationProvider);
        locationUpdates(location);

locationUpdates函数

    public void locationUpdates(Location location){
        if (location!=null){
            StringBuilder stringBuilder = new StringBuilder();
            stringBuilder.append("location:\n");
            stringBuilder.append("经度：");
            stringBuilder.append(location.getLongitude());
            stringBuilder.append("纬度：");
            stringBuilder.append(location.getLatitude());
            Toast.makeText(ShowActivity.this,stringBuilder.toString(),Toast.LENGTH_LONG).show();
        }else{
            Toast.makeText(ShowActivity.this,"error",Toast.LENGTH_LONG).show();
        }
    }