BluetoothManager.startBluetoothDiscovery（）报错处理：errCode:-4,errMessage:Inner error，在HarmonyOS 鸿蒙Next蓝牙扫描中的解决方案

BluetoothManager.startBluetoothDiscovery（）报错处理：errCode:-4,errMessage:Inner error，在HarmonyOS 鸿蒙Next蓝牙扫描中的解决方案

使用bluetoothManager from '@ohos.bluetoothManager';中的bluetoothManager.startBluetoothDiscovery()会报错：errCode:-4,errMessage:Inner error.

我已在配置文件中申请以下权限：

```json
{
  "requestPermissions": [
    {
      "name": "ohos.permission.DISCOVER_BLUETOOTH"
    },
    {
      "name": "ohos.permission.USE_BLUETOOTH"
    },
    {
      "name": "ohos.permission.APPROXIMATELY_LOCATION",   //user_grant类型的权限，需要多填几个属性
      "reason": "$string:approximatelyLocationReason",
      "usedScene": {
        "abilities": [
          "FormAbility"
        ],
        "when": "inuse"
      }
    },
    {
      "name": "ohos.permission.LOCATION",
      "reason": "$string:locationReason",
      "usedScene": {
        "abilities": [
          "FormAbility"
        ],
        "when": "inuse"
      }
    }
  ]
}

同时使用

reqPermissionsFromUser()可以成功调出用户授权窗口，但是授权后就报错

errCode:-4,errMessage:Inner error.