1、新建類MyLocation.java，並繼承Activity。
2、構造函數（可以根據自身需求增刪）：
public MyLocation(Context _context, MapView _mapView, GraphicsOverlay _locationGOlay){
this.context = _context;
this.mMapView = _mapView;
locationGOlay = _locationGOlay;
}
3、使用如下：
MyLocation myLocation = new MyLocation(MainActivity.this, mMapView, mGraphicsOverlay);
// 調用定位初始化
myLocation.initLocaltionMethod();
4、代碼如下：
public static double pi = 3.1415926535897932384626;
public static double x_pi = 3.14159265358979324 * 3000.0 / 180.0;
public static double a = 6378245.0;
public static double ee = 0.00669342162296594323;
private static final int GPS_REQUEST_CODE = 200;
private Context context;
private MapView mMapView;
private LocationManager mLocationManager;
private GraphicsOverlay locationGOlay;
private String mLongitude = ""; // 經度
private String mLatitude = ""; // 維度
/**構造方法*/
public MyLocation(Context _context, MapView _mapView, GraphicsOverlay _locationGOlay){
this.context = _context;
this.mMapView = _mapView;
locationGOlay = _locationGOlay;
}
/**初始化定位方法*/
public void initLocaltionMethod() {
//獲取定位服務
mLocationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
//檢查NETWORK定位是否被打開
boolean networkIsOpen = mLocationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
//檢查passive定位是否被打開
boolean passiveIsOpen = mLocationManager.isProviderEnabled(LocationManager.PASSIVE_PROVIDER);
//檢查GPS定位是否被打開
boolean gpsIsOpen = mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
if (networkIsOpen || passiveIsOpen ||gpsIsOpen) {
//定位
startLocation();
} else {
Toast.makeText(context, "請打開地理位置", Toast.LENGTH_SHORT).show();
}
}
/**執行定位*/
private void startLocation() {
// 判斷定位權限
if (ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED
&& ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_COARSE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
// 調用動態申請權限
requestPermission();
return;
}
/**
* 爲獲取地理位置信息時設置查詢條件,
* 是按GPS定位還是NETWORK定位
*/
//String bestProvider = getProvider();
// Location location = mLocationManager.getLastKnownLocation(bestProvider);
// 調用循環獲取定位方法
Location location = getLastKnownLocation();
if (location != null){
mLongitude = String.valueOf(location.getLongitude());// 經度
mLatitude = String.valueOf(location.getLatitude());// 緯度
/**
* 定位方式：location.getProvider(); - (返回類型：String)
* 經度：location.getLongitude(); - (返回類型：double)
* 緯度：location.getLatitude(); - (返回類型：double)
* 海拔：location.getAltitude(); - (返回類型：double)
* 時間：location.getTime(); - (返回類型：long)
* */
// Toast.makeText(context,"Location" + "緯度：" + mLatitude + "\n" + "經度: " + mLongitude,Toast.LENGTH_SHORT).show();
double lat = location.getLatitude();
double lon = location.getLongitude();
double[] vv = gps84_To_Gcj02(lat, lon);
Vector2D lonLat = new Vector2D(vv[1], vv[0]);
Vector2D vector2D = lonLatToMercator(lonLat);
Point location_point = new Point(vector2D.getX(), vector2D.getY());
Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), R.mipmap.location_blue);
BitmapDrawable bitmapDrawable = new BitmapDrawable(bitmap);
PictureMarkerSymbol pictureMarkerSymbol = new PictureMarkerSymbol(bitmapDrawable);
// 創建添加繪製對象圖層
Graphic graphic = new Graphic(location_point, pictureMarkerSymbol);
//mMapView.getGraphicsOverlays().add(locationGOlay);
// 清除繪製的信息
locationGOlay.getGraphics().clear();
locationGOlay.getGraphics().add(graphic);
mMapView.setViewpointGeometryAsync(location_point);
mMapView.setViewpointScaleAsync(SCALE);
} else {
Toast.makeText(context, "獲取不到經緯度，請稍後再試",Toast.LENGTH_SHORT).show();
}
}
/**
* 定位查詢條件
* 返回查詢條件 ，獲取目前設備狀態下，最適合的定位方式
*/
private String getProvider() {
// 構建位置查詢條件
Criteria criteria = new Criteria();
// 設置定位精確度 Criteria.ACCURACY_COARSE比較粗略，Criteria.ACCURACY_FINE則比較精細
//Criteria.ACCURACY_FINE,當使用該值時，在建築物當中，可能定位不了,建議在對定位要求並不是很高的時候用Criteria.ACCURACY_COARSE，避免定位失敗
// 查詢精度：高
criteria.setAccuracy(Criteria.ACCURACY_FINE);
// 設置是否要求速度
criteria.setSpeedRequired(false);
// 是否查詢海撥：否
criteria.setAltitudeRequired(false);
// 是否查詢方位角 : 否
criteria.setBearingRequired(false);
// 是否允許付費：是
criteria.setCostAllowed(false);
// 電量要求：低
criteria.setPowerRequirement(Criteria.POWER_LOW);
// 返回最合適的符合條件的provider，第2個參數爲true說明 , 如果只有一個provider是有效的,則返回當前provider
return mLocationManager.getBestProvider(criteria, true);
}
/**
*循環獲取GPS、NETWORK、PASSIVE定位方式
* */
private Location getLastKnownLocation() {
mLocationManager = (LocationManager)context.getSystemService(LOCATION_SERVICE);
List<String> providers = mLocationManager.getProviders(true);
Location bestLocation = null;
for (String provider : providers) {
@SuppressLint("MissingPermission")
Location location = mLocationManager.getLastKnownLocation(provider);
if (location == null) {
continue;
}
if (bestLocation == null || location.getAccuracy() < bestLocation.getAccuracy()) {
bestLocation = location;
}
}
return bestLocation;
}
/**轉換座標*/
public static double transformLat(double x, double y) {
double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y
+ 0.2 * Math.sqrt(Math.abs(x));
ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
return ret;
}
public static double transformLon(double x, double y) {
double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1
* Math.sqrt(Math.abs(x));
ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0
* pi)) * 2.0 / 3.0;
return ret;
}
/**
* 84 to 火星座標系 (GCJ-02) World Geodetic System ==> Mars Geodetic System
*
* @param lat
* @param lon
* @return
*/
public static double[] gps84_To_Gcj02(double lat, double lon) {
double dLat = transformLat(lon - 105.0, lat - 35.0);
double dLon = transformLon(lon - 105.0, lat - 35.0);
double radLat = lat / 180.0 * pi;
double magic = Math.sin(radLat);
magic = 1 - ee * magic * magic;
double sqrtMagic = Math.sqrt(magic);
dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
double mgLat = lat + dLat;
double mgLon = lon + dLon;
return new double[]{mgLat, mgLon};
}
/**經緯度轉墨卡託投影*/
public Vector2D lonLatToMercator(Vector2D lonLat){
double x = lonLat.getX() * 20037508.34 / 180;
double y = Math.log(Math.tan((90 + lonLat.getY()) * Math.PI / 360)) / (Math.PI / 180);
y = y * 20037508.34 / 180;
Vector2D mercator = new Vector2D(x,y);
return mercator;
}
/**墨卡託投影轉經緯度*/
public Vector2D MercatorTolonLat(Vector2D mercator){
double x = mercator.getX() / 20037508.34 * 180;
double y = mercator.getY() / 20037508.34 * 180;
y = 180 / Math.PI * (2 * Math.atan(Math.exp(y * Math.PI / 180)) - Math.PI / 2);
Vector2D lonLat = new Vector2D(x,y);
return lonLat;
}
/**
* 動態申請權限
*/
private void requestPermission() {
/**
* //22
* Build.VERSION_CODES.LOLLIPOP_MR1
*
* //23
* Build.VERSION_CODES.M
*
* //26
* Build.VERSION_CODES.O
* */
// 判斷SDK是否大於23
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
AlertDialog.Builder alter = new AlertDialog.Builder(context);
alter.setTitle("GPS定位權限");
alter.setMessage("是否打開定位權限？");
// 取消
alter.setNegativeButton("取消",new DialogInterface.OnClickListener(){
@Override
public void onClick(DialogInterface dialogInterface, int i) {
// 關閉dialog
dialogInterface.dismiss();
}
});
alter.setPositiveButton("確定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
ActivityCompat.requestPermissions((Activity) context,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
GPS_REQUEST_CODE);
}
});
alter.show();
} else {
Toast.makeText(context, "當前SDK版本小於23", Toast.LENGTH_SHORT).show();
}
}
/**
* 實現 onActivityResult
* 本類必須繼承
* AppCompatActivity或者Activity
* */
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode ==GPS_REQUEST_CODE){
startLocation();// 執行定位
}
}