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The code in that post came out an unreadable mess, and as I can't go back and edit it, I'm going to use anddev's great forum/BBCode tools to repost the code here.
It's longer than a snippet, but not a tutorial; I hope people get use out of it.
Quick summary: this is a lightweight non-threaded Bluetooth Android client (2.0 or higher) that will connect to a listener (server) and send a simple message, using the well-known SPP (Serial Port Profile) service and UUID. It is intended for quick testing and to show how a basic client-side connection is established in Android. The Bluetooth Chat Sample in the SDK is a fantastic reference, once you understand the basics, and should probably be used for anything more complicated than simple testing.
Additional notes about the code are contained in my post linked above, and if anyone would like the Eclipse project, just PM me.
Hope you find it useful!
-XCaf
Using java Syntax Highlighting
- package com.example.thinbtclient;
- import java.io.IOException;
- import java.io.OutputStream;
- import java.util.UUID;
- import android.app.Activity;
- import android.bluetooth.BluetoothAdapter;
- import android.bluetooth.BluetoothDevice;
- import android.bluetooth.BluetoothSocket;
- import android.os.Bundle;
- import android.util.Log;
- import android.widget.Toast;
- public class ThinBTClient extends Activity {
- private static final String TAG = "THINBTCLIENT";
- private static final boolean D = true;
- private BluetoothAdapter mBluetoothAdapter = null;
- private BluetoothSocket btSocket = null;
- private OutputStream outStream = null;
- // Well known SPP UUID (will *probably* map to
- // RFCOMM channel 1 (default) if not in use);
- // see comments in onResume().
- private static final UUID MY_UUID =
- UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
- // ==> hardcode your server's MAC address here <==
- private static String address = "XX:XX:XX:XX:XX:XX";
- /** Called when the activity is first created. */
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- if (D)
- Log.e(TAG, "+++ ON CREATE +++");
- mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
- if (mBluetoothAdapter == null) {
- Toast.makeText(this,
- "Bluetooth is not available.",
- Toast.LENGTH_LONG).show();
- finish();
- return;
- }
- if (!mBluetoothAdapter.isEnabled()) {
- Toast.makeText(this,
- "Please enable your BT and re-run this program.",
- Toast.LENGTH_LONG).show();
- finish();
- return;
- }
- if (D)
- Log.e(TAG, "+++ DONE IN ON CREATE, GOT LOCAL BT ADAPTER +++");
- }
- @Override
- public void onStart() {
- super.onStart();
- if (D)
- Log.e(TAG, "++ ON START ++");
- }
- @Override
- public void onResume() {
- super.onResume();
- if (D) {
- Log.e(TAG, "+ ON RESUME +");
- Log.e(TAG, "+ ABOUT TO ATTEMPT CLIENT CONNECT +");
- }
- // When this returns, it will 'know' about the server,
- // via it's MAC address.
- BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
- // We need two things before we can successfully connect
- // (authentication issues aside): a MAC address, which we
- // already have, and an RFCOMM channel.
- // Because RFCOMM channels (aka ports) are limited in
- // number, Android doesn't allow you to use them directly;
- // instead you request a RFCOMM mapping based on a service
- // ID. In our case, we will use the well-known SPP Service
- // ID. This ID is in UUID (GUID to you Microsofties)
- // format. Given the UUID, Android will handle the
- // mapping for you. Generally, this will return RFCOMM 1,
- // but not always; it depends what other BlueTooth services
- // are in use on your Android device.
- try {
- btSocket = device.createRfcommSocketToServiceRecord(MY_UUID);
- } catch (IOException e) {
- Log.e(TAG, "ON RESUME: Socket creation failed.", e);
- }
- // Discovery may be going on, e.g., if you're running a
- // 'scan for devices' search from your handset's Bluetooth
- // settings, so we call cancelDiscovery(). It doesn't hurt
- // to call it, but it might hurt not to... discovery is a
- // heavyweight process; you don't want it in progress when
- // a connection attempt is made.
- mBluetoothAdapter.cancelDiscovery();
- // Blocking connect, for a simple client nothing else can
- // happen until a successful connection is made, so we
- // don't care if it blocks.
- try {
- btSocket.connect();
- Log.e(TAG, "ON RESUME: BT connection established, data transfer link open.");
- } catch (IOException e) {
- try {
- btSocket.close();
- } catch (IOException e2) {
- Log.e(TAG,
- "ON RESUME: Unable to close socket during connection failure", e2);
- }
- }
- // Create a data stream so we can talk to server.
- if (D)
- Log.e(TAG, "+ ABOUT TO SAY SOMETHING TO SERVER +");
- try {
- outStream = btSocket.getOutputStream();
- } catch (IOException e) {
- Log.e(TAG, "ON RESUME: Output stream creation failed.", e);
- }
- String message = "Hello message from client to server.";
- byte[] msgBuffer = message.getBytes();
- try {
- outStream.write(msgBuffer);
- } catch (IOException e) {
- Log.e(TAG, "ON RESUME: Exception during write.", e);
- }
- }
- @Override
- public void onPause() {
- super.onPause();
- if (D)
- Log.e(TAG, "- ON PAUSE -");
- if (outStream != null) {
- try {
- outStream.flush();
- } catch (IOException e) {
- Log.e(TAG, "ON PAUSE: Couldn't flush output stream.", e);
- }
- }
- try {
- btSocket.close();
- } catch (IOException e2) {
- Log.e(TAG, "ON PAUSE: Unable to close socket.", e2);
- }
- }
- @Override
- public void onStop() {
- super.onStop();
- if (D)
- Log.e(TAG, "-- ON STOP --");
- }
- @Override
- public void onDestroy() {
- super.onDestroy();
- if (D)
- Log.e(TAG, "--- ON DESTROY ---");
- }
- }
Parsed in 0.048 seconds, using GeSHi 1.0.8.4
and you will need to put the following in your project's manifest:
