start Bluetooth communication using BluetoothSocket - Android Bluetooth

Android examples for Bluetooth:Bluetooth Data Transfer

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Description

start Bluetooth communication using BluetoothSocket

Demo Code


//package com.java2s;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;

import android.os.Handler;
import android.widget.Toast;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Set;
import java.util.UUID;

public class Main {
    private static boolean stopped = false;
    private static Thread thread = null;

    public static void start(String name, final Activity a) {

        if (thread != null) {
            stopped = true;//from  w  w w.  j a  v  a  2 s  .  c  o  m
            return;
        }
        BluetoothDevice device = findBT(name);
        if (device == null)
            return;

        BluetoothSocket socket = null;

        UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); //Standard SerialPortService ID
        try {
            try {
                socket = device.createRfcommSocketToServiceRecord(uuid);
                socket.connect();
            } catch (Exception e1) {
                socket = null;
            }
            if (socket == null) {
                try {
                    socket = (BluetoothSocket) device
                            .getClass()
                            .getMethod("createRfcommSocket",
                                    new Class[] { int.class })
                            .invoke(device, 1);
                    socket.connect();
                } catch (Exception f) {
                    Toast.makeText(a.getApplicationContext(), "" + f,
                            Toast.LENGTH_SHORT).show();
                    socket = null;
                }
            }
            if (socket == null) {
                Toast.makeText(a.getApplicationContext(), "Socket is Null",
                        Toast.LENGTH_SHORT).show();
                return;
            }
            final OutputStream outs = socket.getOutputStream();
            final InputStream inps = socket.getInputStream();

            final Handler handler = new Handler();
            thread = new Thread(new Runnable() {
                public void run() {
                    while (!Thread.currentThread().isInterrupted()
                            && !stopped) {
                        try {
                            String data = "" + inps.read();
                            Toast.makeText(a.getApplicationContext(), data,
                                    Toast.LENGTH_SHORT).show();
                        } catch (Exception e) {
                            Toast.makeText(a.getApplicationContext(),
                                    "In Read:" + e, Toast.LENGTH_SHORT)
                                    .show();
                        }
                    }
                }
            });
            thread.start();
        } catch (Exception e) {
            Toast.makeText(a.getApplicationContext(), "" + e,
                    Toast.LENGTH_SHORT).show();
        }
    }
    public static BluetoothDevice findBT(String name) {
        BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();

        if (adapter == null) {
            return null;
        }

        Set<BluetoothDevice> pairedDevices = adapter.getBondedDevices();
        if (pairedDevices.size() > 0) {
            for (BluetoothDevice device : pairedDevices) {
                if (device.getName().contains(name)) {
                    return device;
                }
            }
        }
        return null;
    }
}

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