sidishere

private void doDiscovery() {
Log.d("TAG", "doDiscovery()");

// Indicate scanning in the title
setProgressBarIndeterminateVisibility(true);
setTitle("discovering new devices");

// Turn on sub-title for new devices
findViewById(R.id.title_new_devices).setVisibility(View.VISIBLE);

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private final BroadcastReceiver mReceiver = new BroadcastReceiver()
{ 
@Override 
public void onReceive(Context context, Intent intent) 
{ 
String action = intent.getAction(); 
// When discovery finds a device 
if (BluetoothDevice.ACTION_FOUND.equals(action))
{ 
// Get the BluetoothDevice object from the Intent BluetoothDevice 

sidishere

private AdapterView.OnItemClickListener mDeviceClickListener= new AdapterView.OnItemClickListener() 
{ 
public void onItemClick(AdapterView<?> av, View v, int arg2, long arg3) 
{ 
// Cancel discovery because it's costly and we're about to connect 
bluetoothAdapter.cancelDiscovery(); 
Toast.makeText(getApplicationContext(),"Stopping discovery",Toast.LENGTH_SHORT).show(); 
// Get the device MAC address, which is the last 17 chars in the View String 
info = ((TextView) v).getText().toString();
String address = info.substring(info.length() - 17); 

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; 

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"

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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;

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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)
{

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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();

}

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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

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;