public interface Itest {
    @GET("DDD2DMS.aspx")
    Call<Test> getTest(@Query("gps") double gps);
}

Retrofit retrofit=new Retrofit.Builder()
		//如果是json数据必须加这句
              .addConverterFactory(GsonConverterFactory.create())  
              .baseUrl("http://api.zdoz.net/")
		.build();
      Itest itest=retrofit.create(Itest.class);
      Call<Test> testCall= itest.getTest(108.2345);
      testCall.enqueue(new Callback<Test>() {
         @Override
         public void onResponse(Call<Test> call, Response<Test> response) {
             Log.e("得到得json数据",""+response.body().getD());
         }
         @Override
         public void onFailure(Call<Test> call, Throwable t) {

         }
     });

characteristic_W.setValue("string或者byte[]等");
 //写成功issucceed返回true
 boolean issucceed= mBluetoothGatt.writeCharacteristic(characteristic_W)

@Override
public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status)

//characteristic_R接收数据的uuid
//使能characteristic_R的通知
mBluetoothGatt.setCharacteristicNotification(characteristic_R, true);
//未知，测试发现不能改
String UUIDDes = "00002902-0000-1000-8000-00805f9b34fb";
//从接收里获取descriptor
BluetoothGattDescriptor descriptor = characteristic_R.getDescriptor(UUID.fromString(UUIDDes)); 
//写数据到descriptor
descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
//发送给底层
mBluetoothGatt.writeDescriptor(descriptor);

mBluetoothGatt.disconnect();

android.bluetooth.BluetoothGattCallback BluetoothGattCallback = new BluetoothGattCallback() {
 //连接状态
 @Override
 public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState)
 
 //遍历Services和characteristic
 @Override
 public void onServicesDiscovered(BluetoothGatt gatt, int status)
 
 //接收的数据改变时
 @Override
 public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic)
 
 //信号强度
 @Override
 public void onReadRemoteRssi(BluetoothGatt gatt, int rssi, int status)
 
 //写descriptor时的回调，status=0写成功
 @Override
 public void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status)
 
 //写Characteristic时的回调，status=0写成功
 @Override
 public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status)
 
}

private BluetoothGatt mBluetoothGatt;
//连接服务 ，第二个参数设为true为自动连接，false不自动连接
mBluetoothGatt = mBluetoothDevice().connectGatt(context, true,BluetoothGattCallback);  

//获得服务
 List<BluetoothGattService> serviceList = mBluetoothGatt.getServices();
//遍历服务
   for (BluetoothGattService gattService : serviceList) {
   //获得Characteristics
    List<BluetoothGattCharacteristic> characteristicList = gattService.getCharacteristics();
	    //遍历Characteristics
        for (BluetoothGattCharacteristic characteristic : characteristicList) {
					//判断存储自己需要的characteristic
		}
   }

//获取蓝牙
 final BluetoothManager bluetoothManager =(BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
       mBluetoothAdapter = bluetoothManager.getAdapter();
    // 2.Enable Bluetooth 检测用户是否打开蓝牙并提示用户打开
	   if (mBluetoothAdapter == null || !mBluetoothAdapter.isEnabled()) {	
			Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
			startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
	    }

startScan(List<ScanFilter> filters, ScanSettings settings, ScanCallback callback)
stopScan(ScanCallback callback)

@Override
public void onScanResult(int callbackType, ScanResult result)
 @Override
public void onBatchScanResults(List<ScanResult> results)
  @Override
public void onScanFailed(int errorCode) 

startLeScan(BluetoothAdapter.LeScanCallback callback)
stopLeScan(BluetoothAdapter.LeScanCallback callback)

@Override
public void onLeScan(BluetoothDevice bluetoothDevice, int rssi, byte[] bytes)

CoordinateConverter converter  = new CoordinateConverter(); 
// CoordType.GPS 待转换坐标类型
converter.from(CoordType.GPS); 
// sourceLatLng待转换坐标点 DPoint类型
converter.coord(sourceLatLng); 
// 执行转换操作
DPoint desLatLng = converter.convert();

CoordinateConverter类提供的isAMapDataAvailable(double latitude,double longitude)接口可以用来判断指定位置是否在大陆以及港、澳地区。
CoordinateConverter converter  = new CoordinateConverter(); 
//返回true代表当前位置在大陆、港澳地区，反之不在。
boolean isAMapDataAvailable = converter.isAMapDataAvailable(latitude,longitude);
//第一个参数为纬度，第二个为经度，纬度和经度均为高德坐标系。