增加计算2点距离

android/src/main/java/com/amap/flutter/location/AMapLocationClientImpl.java

@@ -7,6 +7,8 @@ import com.amap.api.location.AMapLocation;
 import com.amap.api.location.AMapLocationClient;
 import com.amap.api.location.AMapLocationClientOption;
 import com.amap.api.location.AMapLocationListener;
+import com.amap.api.location.CoordinateConverter;
+import com.amap.api.location.DPoint;
 
 import java.util.Map;
 
@@ -58,6 +60,18 @@ public class AMapLocationClientImpl implements AMapLocationListener {
     }
 
 
+    public static float calculateDistance(double lat1, double lon1, double lat2, double lon2) {
+        DPoint dPoint1 = new DPoint();
+        dPoint1.setLatitude(lat1);
+        dPoint1.setLongitude(lon1);
+        DPoint dPoint2 = new DPoint();
+        dPoint2.setLatitude(lat2);
+        dPoint2.setLongitude(lon2);
+
+        return CoordinateConverter.calculateLineDistance(dPoint1, dPoint2);
+    }
+
+
     /**
      * 停止定位
      */
@@ -70,11 +84,12 @@ public class AMapLocationClientImpl implements AMapLocationListener {
     }
 
     public void destroy() {
-        if(null != locationClient) {
+        if (null != locationClient) {
             locationClient.onDestroy();
             locationClient = null;
         }
     }
+
     /**
      * 定位回调
      *

lib/amap_flutter_location.dart

@@ -54,6 +54,11 @@ class AMapFlutterLocation {
     _methodChannel.invokeMethod('stopLocation', {'pluginKey': _pluginKey});
     return;
   }
+  ///计算2点之间的距离
+  Future<double> calculateDistance(double lat1, double lon1, double lat2, double lon2) async {
+    double result = await _methodChannel.invokeMethod('calculateDistance', {'lat1': lat1, 'lon1': lon1, 'lat2': lat2, 'lon2': lon2});
+    return result;
+  }
 
   ///设置Android和iOS的apikey，建议在weigdet初始化时设置<br>
   ///apiKey的申请请参考高德开放平台官网<br>