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android开发之蓝牙配对连接的方法
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最近在做藍(lán)牙開鎖的小項(xiàng)目，手機(jī)去連接單片機(jī)總是出現(xiàn)問題，和手機(jī)的連接也不穩(wěn)定，看了不少藍(lán)牙方面的文檔，做了個(gè)關(guān)于藍(lán)牙連接的小結(jié)。
在做android藍(lán)牙串口連接的時(shí)候一般會(huì)使用
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BluetoothSocket tmp = null;try {tmp = device.createRfcommSocketToServiceRecord(MY_UUID);} catch (IOException e) {Log.e(TAG, "create() failed", e);}
然后是tmp賦給BluetoothSocket,接著調(diào)用connect方法進(jìn)行藍(lán)牙設(shè)備的連接。
可是 BluetoothSocket 的connect方法本身就會(huì)報(bào)很多異常錯(cuò)誤。
以下根據(jù)對(duì)藍(lán)牙開發(fā)的一點(diǎn)研究可通過以下方法解決：
方法1.先進(jìn)行藍(lán)牙自動(dòng)配對(duì)，配對(duì)成功，通過UUID獲得BluetoothSocket,然后執(zhí)行connect()方法。
方法2.通過UUID獲得BluetoothSocket,然后先根據(jù)mDevice.getBondState()進(jìn)行判斷是否需要配對(duì)，最后執(zhí)行connnect()方法。
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private class ConnectThread extends Thread {String macAddress = "";public ConnectThread(String mac) {macAddress = mac;}public void run() {connecting = true;connected = false;if(mBluetoothAdapter == null){mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();}mBluetoothDevice = mBluetoothAdapter.getRemoteDevice(macAddress);mBluetoothAdapter.cancelDiscovery();try {socket = mBluetoothDevice.createRfcommSocketToServiceRecord(uuid);} catch (IOException e) {Log.e(TAG, "Socket", e);} while (!connected && connetTime <= 10) { connectDevice();}}public void cancel() {try {socket.close();socket = null;} catch (Exception e) {e.printStackTrace();} finally {connecting = false;}}}
接下來是調(diào)用的連接設(shè)備方法connectDevice():
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protected void connectDevice() { try { if (mBluetoothDevice.getBondState() == BluetoothDevice.BOND_NONE) { Method creMethod = BluetoothDevice.class.getMethod("createBond"); Log.e("TAG", "開始配對(duì)"); creMethod.invoke(mBluetoothDevice); } else { } } catch (Exception e) { e.printStackTrace(); } mBluetoothAdapter.cancelDiscovery(); try { socket.connect(); connected = true;} catch (IOException e) { connetTime++;connected = false;try { socket.close();socket = null;} catch (IOException e2) { Log.e(TAG, "Cannot close connection when connection failed"); } } finally {connecting = false;} }
方法3.利用反射通過端口獲得BluetoothSocket,然后執(zhí)行connect()方法。
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private class ConnectThread extends Thread {String macAddress = "";public ConnectThread(String mac) {macAddress = mac;}public void run() {connecting = true;connected = false;if(mBluetoothAdapter == null){mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();}mBluetoothDevice = mBluetoothAdapter.getRemoteDevice(macAddress);mBluetoothAdapter.cancelDiscovery();initSocket(); while (!connected && connetTime <= 10) {try {socket.connect();connected = true;} catch (IOException e1) {connetTime++;connected = false;try {socket.close();socket = null;} catch (IOException e2) {Log.e(TAG, "Socket", e2);}} finally {connecting = false;}}}public void cancel() {try {socket.close();socket = null;} catch (Exception e) {e.printStackTrace();} finally {connecting = false;}}}
接下來是初始化并得到BluetoothSocket的方法
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/*** 取得BluetoothSocket*/private void initSocket() {BluetoothSocket temp = null;try { Method m = mBluetoothDevice.getClass().getMethod("createRfcommSocket", new Class[] { int.class });temp = (BluetoothSocket) m.invoke(mBluetoothDevice, 1);} catch (SecurityException e) {e.printStackTrace();} catch (NoSuchMethodException e) {e.printStackTrace();} catch (IllegalArgumentException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();}socket = temp;}
要點(diǎn)：1.藍(lán)牙配對(duì)和連接是兩回事，不可混為一談。
2.藍(lán)牙串口連接可通過端口 （1-30）和UUID兩種方法進(jìn)行操作。
3.通過UUID進(jìn)行藍(lán)牙連接最好先進(jìn)行配對(duì)操作。
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