delphi xe6 调用java原生GPS的方法

如果用xe6自带的LocationSensor控件，默认优先使用网络位置，为了直接使用GPS位置，在网上搜到了以下代码，经实测证实是可用的。

 

uses Androidapi.JNI.Location, Androidapi.JNIBridge, Androidapi.JNI.JavaTypes, 

  Androidapi.JNI.Os,FMX.Helpers.Android,Androidapi.JNI.GraphicsContentViewText;

 

type

  TLocationListener = class;

  TForm1 = class(TForm)

 

  . . . . . .

 

  private

    { Private declarations }

    FLocationManager : JLocationManager;

    locationListener : TLocationListener;

  public

    destructor Destroy; override;

    { Public declarations }

    procedure onLocationChanged(location: JLocation);

  end;

  //Sensore GPS

  TLocationListener = class(TJavaLocal, JLocationListener)

  private

    [weak]

    FParent : TForm1;

  public

    constructor Create(AParent : TForm1);

    procedure onLocationChanged(location: JLocation); cdecl;

    procedure onProviderDisabled(provider: JString); cdecl;

    procedure onProviderEnabled(provider: JString); cdecl;

    procedure onStatusChanged(provider: JString; status: Integer; extras: JBundle); cdecl;

  end;

 

. . . . .

 

constructor TLocationListener.Create(AParent: TForm1);

begin

  inherited Create;

  FParent := AParent;

end;

 

procedure TLocationListener.onLocationChanged(location: JLocation);

begin

  FParent.onLocationChanged(location);

end;

 

procedure TLocationListener.onProviderDisabled(provider: JString);

begin

end;

 

procedure TLocationListener.onProviderEnabled(provider: JString);

begin

end;

 

procedure TLocationListener.onStatusChanged(provider: JString; status: Integer; extras: JBundle);

begin

end;

 

destructor TForm1.Destroy;

begin

  if Assigned(locationListener) then

    FLocationManager.removeUpdates(locationListener);

  inherited;

end;

 

procedure TForm1.onLocationChanged(location: JLocation);

begin

  if Assigned(location) then

  begin

     //variabili da recuperare dal sensore

     Label4.Text := location.getLatitude.ToString;

     Label5.Text := location.getLongitude.ToString;

     Label6.Text := location.getAltitude.ToString;

     Label8.Text := location.getSpeed.ToString;

     Label10.Text := location.getTime.ToString;

  end;

end;

 

procedure TForm1.FormCreate(Sender: TObject);

var LocationManagerService: JObject;

    location : JLocation;

begin 

  if not Assigned(FLocationManager) then

  begin

    LocationManagerService := SharedActivityContext.getSystemService(TJContext.JavaClass.LOCATION_SERVICE);

    FLocationManager := TJLocationManager.Wrap((LocationManagerService as ILocalObject).GetObjectID);

    if not Assigned(locationListener) then locationListener := TLocationListener.Create(self);

    FLocationManager.requestLocationUpdates(TJLocationManager.JavaClass.GPS_PROVIDER, 1000, 0, locationListener, TJLooper.JavaClass.getMainLooper);

  end;

 FLocationManager.isProviderEnabled(TJLocationManager.JavaClass.GPS_PROVIDER);

  FLocationManager.isProviderEnabled(TJLocationManager.JavaClass.NETWORK_PROVIDER);

  onLocationChanged(location);

end