通过HC-05蓝牙从Android应用程序向Arduino发送变量值或字符串

我正在用Android Studio创建一个Android应用程序。当我按下一个按钮时，我想通过蓝牙HC-05向Arduino发送一个变量值，也许可以在串行监视器中打印它。这是我正在使用的代码，但它没有按预期工作

BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();   
BluetoothDevice hc05 = btAdapter.getRemoteDevice("98:D3:91:FD:3E:F0");


BluetoothSocket btSocket = null;

    try {
        btSocket = hc05.createRfcommSocketToServiceRecord(mUUID);            
        btSocket.connect();
    } catch (IOException e) {
        e.printStackTrace();
    }

BluetoothSocket finalBtSocket = btSocket;

button12.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {

       
        try {
            OutputStream outputStream = finalBtSocket.getOutputStream();
            finalBtSocket.getOutputStream().write("S".toString().getBytes());
           //outputStream.write(Integer.parseInt(puk));
        } catch (IOException e) {
            e.printStackTrace();
        }
        
    }
});

我在另一个活动中插入了“puk”变量，并将其传递给此活动。我想要的是能够在串行监视器中打印该变量的值

如果您有任何有帮助的信息，我们将不胜感激。

尝试使用以下代码：

BluetoothSocket btSocket = null;

        try {
            btSocket = hc05.createRfcommSocketToServiceRecord(mUUID);
            
            btSocket.connect();

            AlertDialog.Builder builder = new AlertDialog.Builder(Status_Poarta.this);

            builder.setCancelable(true);

            builder.setMessage("Connection is successful");

            builder.setNegativeButton("Ok", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.cancel();
                }
            });
            builder.show();





        } catch (IOException e) {
            e.printStackTrace();

            AlertDialog.Builder builder = new AlertDialog.Builder(Status_Poarta.this);

            builder.setCancelable(true);

            builder.setMessage("No connection established");

            builder.setNegativeButton("Ok", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.cancel();
                }
            });
            builder.show();


        }

    BluetoothSocket finalBtSocket = btSocket;

    
    button12.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {

            
            try {
                OutputStream outputStream = finalBtSocket.getOutputStream();                 
                outputStream.write(puk.getBytes());   
            } catch (IOException e) {
                e.printStackTrace();
            }

        }
    });

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我是Emi，我是一个终端项目，我是一个客户。