蓝牙扫描 LeScanCallback 方法 不回调_lescancallback无回调

参考 链接

最近在做一个蓝牙项目，用到了BLE
然而在扫描设备的时候，一直出不来东西，debug回调也没任何反应，然后看好多博客说得开启位置服务，然后我就手动先开启了，配置文件也添加了服务，
但是还是不行，然后尝试代码开启，果然出现弹窗，列表出来了

流程：
1.1 清单加入位置权限(有可能清单中已经具备了)

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
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1.2 动态请求权限(关键)

 private static final int REQUEST_COARSE_LOCATION = 0;

    private void mayRequestLocation() {
        if (Build.VERSION.SDK_INT >= 23) {
            int checkCallPhonePermission = ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION);
            if (checkCallPhonePermission != PackageManager.PERMISSION_GRANTED) {
                //判断是否需要 向用户解释，为什么要申请该权限
                if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_COARSE_LOCATION))
                    Toast.makeText(this, "动态请求权限", Toast.LENGTH_LONG).show();
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, REQUEST_COARSE_LOCATION);
                return;
            } else {

            }
        } else {

        }
    }
 //系统方法,从requestPermissions()方法回调结果
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        //确保是我们的请求
        if (requestCode == REQUEST_COARSE_LOCATION) {
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                Toast.makeText(this, "权限被授予", Toast.LENGTH_SHORT).show();
            } else if (grantResults[0] != PackageManager.PERMISSION_GRANTED) {
                Toast.makeText(this, "权限被拒绝", Toast.LENGTH_SHORT).show();
            }
        } else {
            super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        }
    }
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当用户点击始终允许后就可以正常运行了!