Android BluetoothDevice connectGatt 在某些设备上总是失败并显示错误 133

Question

我的应用程序在连接到某些设备上的 BluetoothGatt 时出现问题。

所有与 BLE 相关的代码都位于 android 中Service，除华为 CAM-L03外，一切正常。据报道，一些旧的三星 Galaxy 设备也存在问题。

我最近发现，在某些设备上，所有 BLE 通信都必须在 UI 线程上执行。我写了一个快速测试应用程序，当一切都在 UI 线程上运行时，华为的问题就消失了。

我试着创建Handler在Service与主尺蠖：

final Context context = getApplicationContext();
Handler handler = new Handler(context.getMainLooper());
handler.post(new Runnable(){
    @Override
    public void run() {
        BluetoothGatt gatt = device.connectGatt(context, false, callBackHandler);
        …
    } 
});

但这仍然在连接回调中给了我 GATT_ERROR 133，我有点怀疑，因为上下文是服务，而不是 UI 应用程序。

我在这里只看到两个选项：

1. 列表项 不支持某些设备
2. 将所有内容移至 UI 应用程序以支持所有设备

我不满足于其中任何一个。还有其他我不知道的选择吗？

Answer 1

我想出了问题究竟是什么以及如何解决它。我将我的答案添加为对连接尝试时抛出的通用 gatt 错误 (133) 的另一项检查，因为我没有找到暗示同一问题的答案。

I have been led to a wrong conclusion by answers like this. I think that bug was long fixed on Android. The fact that I was getting connection failed callback is an indication that the thread issue was irrelevant since the callbacks were registered.

The problem I was facing was related to the fact that I kept the bluetooth adapter scanning while attempting to connect to the BLE device. It appears that some phones have a problem with that.

The requirements of my application dictate continuous scanning for the time the service is running and all the test phones I had around didn't have problems with it. This model of HUAWEI though, would refuse to connect.

TL;DR Stop scanning before attempting to connect, restart scanning if required after disconnect.