sidishere

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#121212"
    android:orientation="vertical">

<RelativeLayout
android:layout_marginTop="60dp"
android:layout_width="match_parent"

sidishere

<shape xmlns:android="http://schemas.android.com/apk/res/android" 
android:innerRadiusRatio="2.5" 
android:shape="ring" 
android:thickness="4dp" 
android:useLevel="false"> 
<solid android:color="#b4b4b4"/> 
<corners 
android:bottomLeftRadius="60dp" 
android:bottomRightRadius="60dp" 
android:topLeftRadius="60dp" 

sidishere

#include<SoftwareSerial.h>

#define led D5

SoftwareSerial mySerial(D7,D8);

char command;

String string;

sidishere

import androidx.appcompat.app.AppCompatActivity;
import android.app.ProgressDialog;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;

sidishere

private class ConnectBT extends AsyncTask<Void, Void, Void>
{
private boolean ConnectSuccess = true; //if it's here, it's almost connected

@Override
protected void onPreExecute()
{
progress = ProgressDialog.show(LedControl.this, "Connecting...", "Please wait!!!");  //show a progress dialog
}

sidishere

private void Disconnect()
{
if (btSocket!=null) //If the btSocket is busy
{
try
{
btSocket.close(); //close connection
Toast.makeText(getApplicationContext(),"Connection closed successfully",Toast.LENGTH_SHORT).show();

}

sidishere

onButton = (Button) findViewById(R.id.onButton);
offButton = (Button) findViewById(R.id.offButton);
disconnectButton = (Button) findViewById(R.id.disconnectButton);

Intent newint = getIntent();
address = newint.getStringExtra("DEVICE_ADDRESS");onButton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{

sidishere

BluetoothAdapter myBluetooth = null;
BluetoothSocket btSocket = null;

Button onButton, offButton, disconnectButton;
private ProgressDialog progress;

String address=null;
static final UUID myUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
private boolean isBtConnected = false;

sidishere

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"

sidishere

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import android.bluetooth.BluetoothAdapter; 
import android.bluetooth.BluetoothDevice; 
import android.content.BroadcastReceiver; 
import android.content.Context; 
import android.content.Intent; 
import android.content.IntentFilter; 
import android.os.Bundle; 
import android.util.Log;