Notes

package com.example.soobash_app;

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.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.bluetooth.BluetoothSocket;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Set;
import java.util.UUID;

public class bluetooth extends AppCompatActivity {


private static final int REQUEST_ENABLE_BT = 0;
private static final int REQUEST_DISCOVER_BT = 1;

private final String DEVICE_ADDRESS = "00:18:E4:40:00:06"; //MAC Address of Bluetooth Module
private final UUID PORT_UUID = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb");


//status bluetooth and paired bluetooth respectively
TextView mStatusBlue, mPairedBlue;
Button onBtn, offBtn, discoverBtn, pairedBtn, scanBtn;


// scan device manage
ListView scan_device;
ArrayList<String> stringArrayList = new ArrayList<String>();
ArrayAdapter<String> arrayAdapter;
// BluetoothAdapter


String command;
private OutputStream outputStream;
private BluetoothSocket socket;
private BluetoothDevice device;
BluetoothAdapter bluetoothAdapter= BluetoothAdapter.getDefaultAdapter();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bluetooth);

mStatusBlue = findViewById(R.id.bluetooth_status); //status text field
mPairedBlue = findViewById(R.id.pairedText); //pair button
onBtn = findViewById(R.id.btnBluetoothOn); //button bluetooth on
offBtn = findViewById(R.id.btnBluetoothOff); // button bluetooth off
discoverBtn = findViewById(R.id.btnBluetoothDiscover);
pairedBtn = findViewById(R.id.btnPaired);


// scan device action
scanBtn = (Button) findViewById(R.id.btnScan);
scan_device = (ListView) findViewById(R.id.scanListDevice);

// bluetooth adapter
// bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
// System.out.println(bluetoothAdapter.getBondedDevices());


// checking if bluetooth is available or not
// if (bluetoothAdapter == null) {
// mStatusBlue.setText("bluetooth devices are not available. ".toUpperCase());
//
// } else {
// mStatusBlue.setText("bluetooth devices are available. ".toUpperCase());
// }

// bluetooth button on
onBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!bluetoothAdapter.isEnabled()) {
showToast("Bluetooth is turning on...");
Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(intent, REQUEST_ENABLE_BT);

} else {
showToast("Bluetooth is already in on status...");

}
}

});


// bluetooth discover on
discoverBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!bluetoothAdapter.isDiscovering()) {
showToast("Making Device Discoverable");
Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
startActivityForResult(intent, REQUEST_DISCOVER_BT);
}
}
});


// blutooth off button
offBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (bluetoothAdapter.isEnabled()) {
bluetoothAdapter.disable();
showToast("Turning off bluetooth...");
// can set the image below

} else {
showToast("Bluetooth is off already...");
}

}
});


//Button that connects the device to the bluetooth module when pressed
pairedBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {

if (BTinit()) {
BTconnect();
}

}
});








scanBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
bluetoothAdapter.startDiscovery();

}
});

IntentFilter intentFilter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(myReceiver, intentFilter);

arrayAdapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_2, stringArrayList);
scan_device.setAdapter(arrayAdapter);
}

BroadcastReceiver myReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device= intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
stringArrayList.add(device.getName());
arrayAdapter.notifyDataSetChanged();

}
}
};

// }








// paired devices text displays
// pairedBtn.setOnClickListener(new View.OnClickListener() {
// @Override
// public void onClick(View v) {
//
//// paires();
//
// if (bluetoothAdapter.isEnabled()) {
//// mPairedBlue.setText("Paired Devices");
//// Set<BluetoothDevice> devices= bluetoothAdapter.getBondedDevices();
// BTconnect();
//// for (BluetoothDevice device: devices){
//// BTconnect();
//// mPairedBlue.append("nDevice: "+ device.getName()+ "," + device);
//
//// }
// } else {
//// bluetooth is off so couldn't pair any devices
// showToast("Turn on bluetooth to pair with devices...");
//
// }
// }
// });

// }

// public void paires(){
// Intent pair= new Intent(this, pairedDevices.class);
// startActivity(pair);
// }

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
switch (requestCode) {
case REQUEST_ENABLE_BT:
if (resultCode == RESULT_OK) {
// BLUETOOTH IS ON
//below can set an image for bluetooth on
showToast("Bluetooth is on...");
} else {
// set image for blueooth off
showToast("Bluetooth turn on failed...");
}
break;
}
super.onActivityResult(requestCode, resultCode, data);
}

// Message display function
private void showToast(String msg) {

Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();


}








// TRY CODE FOR PAIRING WITH BLUETOOTH MODULE
//Initializes bluetooth module
public boolean BTinit() {
boolean found = false;

BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

if (bluetoothAdapter == null) //Checks if the device supports bluetooth
{
Toast.makeText(getApplicationContext(), "Device doesn't support bluetooth", Toast.LENGTH_SHORT).show();
}

if (!bluetoothAdapter.isEnabled()) //Checks if bluetooth is enabled. If not, the program will ask permission from the user to enable it
{
Intent enableAdapter = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableAdapter, 0);

try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}

Set<BluetoothDevice> bondedDevices = bluetoothAdapter.getBondedDevices();

if (bondedDevices.isEmpty()) //Checks for paired bluetooth devices
{
Toast.makeText(getApplicationContext(), "Please pair the device first", Toast.LENGTH_SHORT).show();
} else {
for (BluetoothDevice iterator : bondedDevices) {
if (iterator.getAddress().equals(DEVICE_ADDRESS)) {
device = iterator;
found = true;
break;
}
}
}

return found;
}

public void dispTxt(String msg) {
Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
}


public boolean BTconnect() {
boolean connected = true;

try {
socket = device.createRfcommSocketToServiceRecord(PORT_UUID); //Creates a socket to handle the outgoing connection
socket.connect();

Toast.makeText(getApplicationContext(),
"Connection to bluetooth device successful", Toast.LENGTH_LONG).show();
} catch (IOException e) {
e.printStackTrace();
connected = false;
}

if (connected) {
try {
outputStream = socket.getOutputStream(); //gets the output stream of the socket
} catch (IOException e) {
e.printStackTrace();
}
}

return connected;
}

@Override
protected void onStart() {
super.onStart();
}
}