未为配对设备调用 Android BLE ACTION_ACL_CONNECTED

Question

我使用的是 Android 4.4。我有 2 个蓝牙设备，一个老式蓝牙和一个 BLE。就它们传输的数据而言，它们在功能上是相同的。它们都有一个按钮，按下时可以连接和传输数据。

我有蓝牙权限并在我的 list 中注册了一个 BroadcastReceiver，就像这样

...

<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />

...

<receiver
    android:name=".BluetoothBroadcastReceiver">
    <intent-filter>
        <action android:name="android.bluetooth.device.action.ACL_CONNECTED" />
        <action android:name="android.bluetooth.device.action.ACL_DISCONNECTED" />
        <action android:name="android.bluetooth.device.action.ACL_DISCONNECT_REQUESTED" />
    </intent-filter>
</receiver>

为了测试，我只是在 BroadcastReceiver 中记录对 onReceive 的调用

@Override
public void onReceive(Context context, Intent intent) {
    Log.d(TAG, intent.getAction());
}

问题是:两个设备都与手机配对，但只有老式蓝牙设备会在按下蓝牙设备按钮时生成 ACTION_ACL_CONNECTED/ACTION_ACL_DISCONNECTED 广播。 BLE 设备尝试连接和传输时没有任何反应。

如果我使用

主动扫描 BLE 连接，我能够成功连接并从 BLE 设备接收数据

mBluetoothAdapter.startLeScan(mLeScanCallback);

我是否必须明确扫描 BLE 设备以允许它们连接？ BLE 设备是否在未明确扫描 BLE 设备时生成 ACTION_ACL_CONNECTED/ACTION_ACL_DISCONNECTED 广播？还是应该在与手机配对后自动连接？

Answer 1

ACTION_ACL_CONNECTED/ACTION_ACL_DISCONNECTED 广播仅适用于 BR/EDR(经典蓝牙)，不适用于 BLE。

对于 BLE，您必须使用最新 Android 版本提供的 API 和回调。