android - mBluetoothGatt.getService(uuid) 返回 null

Question

在我的应用程序中，我传递助听器服务的 UUID 编号，如来自谷歌的 BLE 示例，即 0000a00-0000-1000-8000-00805f9b34fb

但是 getservice 返回 null 意味着 BluetoothGatt 不支持该服务。为什么会这样，谁能帮帮我。

Answer 1

您必须首先根据文档发现给定设备的所有服务。

This function requires that service discovery has been completed for the given device. http://developer.android.com/reference/android/bluetooth/BluetoothGatt.html#getService(java.util.UUID)

@Override
    // New services discovered
    public void onServicesDiscovered(BluetoothGatt gatt, int status) {
        if (status == BluetoothGatt.GATT_SUCCESS) {
            BluetoothGattService mBluetoothGattService = mBluetoothGatt.getService(UUID.fromString(serviceUUID));
            if (mBluetoothGattService != null) {
                Log.i(TAG, "Service characteristic UUID found: " + mBluetoothGattService.getUuid().toString());
            } else {
                Log.i(TAG, "Service characteristic not found for UUID: " + serviceUUID);
        }
    }

或者你可以直接运行搜索

for (BluetoothGattService gattService : gattServices) {
    Log.i(TAG, "Service UUID Found: " + gattService.getUuid().toString());
}