xe5 for android 地理定位GPS

先上源码，在解释。

implementation

uses androidapi.jni.JavaTypes, androidapi.jni.Location, FMX.helpers.android,
  androidapi.jni.GraphicsContentViewText, androidapi.jnibridge;
// context在android的content.context包
// ILocalObject在androidapi.jnibridge里
// sharedActivitycontext在fmx.helpers里
{$R *.fmx}

// 用android的地理GPS定位函数
procedure TForm1.Button1Click(Sender: TObject);
const
  LGoogleMapURL: string = 'https://maps.google.com/maps?q=%s,%s&output=embed';
var
  LocationManagerService: JObject;
  Location: JLocation;
  fLocationManager: JLocationManager;

  Lat: string;
  Lon: string;
  Alt: string;
begin
  if not assigned(fLocationManager) then
  begin
//获得Java对象

    LocationManagerService := sharedActivitycontext.getSystemService
      (TJcontext.JavaClass.LOCATION_SERVICE);
// 获得对象的java实例

fLocationManager := tjlocationmanager.Wrap
  ((LocationManagerService as ILocalObject).GetObjectID);
 end;
Java的方法。

  // use the gps provider to get current lat, long and altitude
  Location := fLocationManager.getLastKnownLocation
    (tjlocationmanager.JavaClass.GPS_PROVIDER);
    lat:=format('%2.6f',[location.getLatitude]);
    lon:=format('%2.6f',[location.getLongitude]);
    Alt := format('%2.6f',[location.getAltitude]);
    edit1.Text:=lat;
    edit2.Text:=lon;
   WebBrowser1.Navigate(Format(LGoogleMapURL, [Lat, Lon]));
end;

end.

通过JNI调用Java服务，基本就是这个步骤。

 

http://blog.csdn.net/syndicater/article/details/18548817