可以參考BlueCove這個實作JSR82的Project，裡面的這張圖對Bluetooth解說很清楚，可供參考。
Bluetooth Stack的部份在不同系統、程式語言上都是相同的，會有差異的只有頂層的Abstract API。
若想對Bluetooth整體軟硬体有仔細的了解可以參考「Bluetooth Application Programming with the Java APIs Essentials Edition」這本書。
2.Android Bluetooth開發基本需求
Android SDK 2.0以上(含2.0)版本。
支援Android 2.0的手機一隻(Android Emulater無法模擬Bluetooth，所以一定要有實體手機)。
3.實作參考文件
http://developer.android.com/guide/topics/wireless/bluetooth.html
http://www.anddev.org/serial_over_bluetooth_simple_test_client-t11106.html
一般來說，我們只會實作Bluetooth Client的程式去跟其它的Bluetooth硬體溝通取資料。連線方式大多是利用Serial Port Service方式去跟遠端的裝置溝通，所以相對應的UUID不能設錯，一定要設成下述範例這組UUID，不然會發生找不到Service的問題(附帶一提，這是假設一般遠端裝置有提供Serial Port Service，所以你才可以用這組UUID來進行通訊，如果遠端裝置比較特別就要去查硬體規格去看它提供的Service是哪些，找出對應的UUID)。
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| private static final UUID SERIAL_PORT_SERVICE_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); |
4.Android Bluetooth API目前的限制
目前只支援RFCOMM的方式進行通訊
5.實作參考範例
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| // 取自http://www.anddev.org/serial_over_bluetooth_simple_test_client-t11106.html裡的範例 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 ---"); } } AndroidManifest.xml裡的Permission設定加下述二行 |
Android SDK 2.1裡的Bluetooh Sample (在 x:/android sdk安裝目錄/platforms/android-2.1/samples/BluetoothChat 裡面，或是到 http://developer.android.com/resources/samples/BluetoothChat/index.html 看範例，二者是一樣的東西)
http://code.google.com/p/apps-for-android/ 裡面有個 BTClickLinkCompete Sample，可經由SVN去下載回來看
資料來源
