在android中发送蓝牙字符串

Question

好的，所以我有一个 bluetooth.java 类，（我希望）它会发送我的字符串。但是，每当我尝试发送命令时，我破碎的吐司只会显示不。我错过了什么重要的东西吗？我那里只有这两个功能..

void openBT() throws IOException {

    UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb");
    try {
        mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);
    } catch (IOException e) {
        Toast.makeText(getApplicationContext(), "Unable to create socket", Toast.LENGTH_LONG).show();
    }
    try {
        mmSocket.connect();
    } catch (IOException e) {
        Toast.makeText(getApplicationContext(), "Unable to connect to socket", Toast.LENGTH_LONG).show();
    }
    mmOutputStream = mmSocket.getOutputStream();
    mmInputStream = mmSocket.getInputStream();
}

void sendData2() throws IOException {
    if (BtCommand == "0"){
        msg = "Fan2 Off";
    }
    if (BtCommand == "1"){
        msg = "Fan2 On";
    }

    mmOutputStream.write(msg.getBytes());
}

这些是我唯一设置的东西

  BluetoothSocket mmSocket;
BluetoothDevice mmDevice;
String BtCommand;
OutputStream mmOutputStream;
InputStream mmInputStream

我确定是 openBT 功能失败，我已与设备配对。

Answer 1

您确定选择了 UUID 吗？

List of UUIDs

或者，尝试重新编写您的代码。我使用 2 个线程（1 个用于连接，第二个用于连接和通信）