在 Android Marshmallow 中请求多个蓝牙权限

我正在开发一个具有连接功能的应用程序，该应用程序连接到使用 SDK 23 进行编译的蓝牙设备。我在请求蓝牙的多个权限时遇到问题。这是我到目前为止所做的：

@Override
public void onStart() {
    super.onStart();
    if (D)
        Log.e(TAG, "++ ON START ++");


    if (ContextCompat.checkSelfPermission(MyBlueToothClientActivity.this,
            Manifest.permission.BLUETOOTH)
            != PackageManager.PERMISSION_GRANTED) {
    } else {
        ActivityCompat.requestPermissions(MyBlueToothClientActivity.this,
                new String[]{Manifest.permission.BLUETOOTH, Manifest.permission.BLUETOOTH_ADMIN},
                REQUEST_ENABLE_BT);
    }


    if (ContextCompat.checkSelfPermission(MyBlueToothClientActivity.this,
            Manifest.permission.BLUETOOTH)
            != PackageManager.PERMISSION_GRANTED) {
    } else {

        ActivityCompat.requestPermissions(MyBlueToothClientActivity.this,
                new String[]{Manifest.permission.BLUETOOTH, Manifest.permission.BLUETOOTH_ADMIN},
                REQUEST_CONNECT_DEVICE_INSECURE);
    }
}


@Override
public void onRequestPermissionsResult(int requestCode,
                                       String permissions[], int[] grantResults) {
    switch (requestCode) {
        case REQUEST_ENABLE_BT: {
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

    // permission was granted, yay! 
                Intent enableIntent = new Intent(
                        BluetoothAdapter.ACTION_REQUEST_ENABLE);
                startActivityForResult(enableIntent, REQUEST_ENABLE_BT);


            } else {

                // permission denied, boo! Disable the
                // functionality that depends on this permission.
                if (CommonData.mChatService == null)
                    setupChat();

                Toast.makeText(MyBlueToothClientActivity.this, "Permission denied for bluetooth", Toast.LENGTH_SHORT).show();
            }
            return;
        }

        case REQUEST_CONNECT_DEVICE_INSECURE: {
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                // permission was granted, yay!
                Intent enableIntent = new Intent(
                        BluetoothAdapter.ACTION_REQUEST_ENABLE);
                startActivityForResult(enableIntent, REQUEST_CONNECT_DEVICE_INSECURE);


            } else {

                // permission denied, boo! Disable the
                // functionality that depends on this permission.
                if (CommonData.mChatService == null)
                    setupChat();

                Toast.makeText(MyBlueToothClientActivity.this, "Permission denied for bluetooth", Toast.LENGTH_SHORT).show();
            }
            return;
        }

        // other 'case' lines to check for other
        // permissions this app might request
    }
}

虽然我能够获得请求启用蓝牙的对话框，但我没有获得第二个权限，即连接到设备。在 logcat 中，我得到：

    01-01 06:41:24.334 25473-25473 E/BluetoothChat: ++ ON START ++
    01-01 06:41:24.344 25473-25473 W/Activity: Can reqeust only one set of permissions at a time

由于我无法连接到设备，我就被困在这里了。这段代码在 Android 版本上运行良好，直到 Lollipop，只是在 Marshmallow 版本上导致问题。

BLUETOOTH and BLUETOOTH_ADMIN are 普通权限因此它们是自动授予的。仅具有以下权限危险权限表需要在运行时请求。

然而，正如文中提到的Android 6.0 的变化：访问硬件标识符:

要通过蓝牙和 Wi-Fi 扫描访问附近外部设备的硬件标识符，您的应用程序现在必须具有ACCESS_FINE_LOCATION or ACCESS_COARSE_LOCATION权限：

• WifiManager.getScanResults()
• 蓝牙设备.ACTION_FOUND
• 蓝牙LeScanner.startScan()

如果您使用这些方法中的任何一种，您至少需要请求ACCESS_COARSE_LOCATION在运行时（因为它is危险的许可）。