项目在蓝牙连接的时候出现崩溃是为什么？

如果你的项目的targetsdkversion为31，即Android 12或者以上，根据Android 12新添加的蓝牙特性，

你需要配置下面这些权限才可以正常使用。

崩溃很可能是权限错误导致：

    <!-- Needed only if your app looks for Bluetooth devices.
         You must add an attribute to this permission, or declare the
         ACCESS_FINE_LOCATION permission, depending on the results when you
         check location usage in your app. -->
    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />

    <!-- Needed only if your app makes the device discoverable to Bluetooth
         devices. -->
    <uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" />

    <!-- Needed only if your app communicates with already-paired Bluetooth
         devices. -->
    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />

详细描述文章：https://developer.android.com/about/versions/12/features/bluetooth-permissions?hl=zh-cn