Android實現(xiàn)藍牙聊天功能

更新時間：2018年06月02日 14:03:49 作者：paul_zzq

這篇文章主要為大家詳細介紹了Android實現(xiàn)藍牙聊天功能，具有一定的參考價值，感興趣的小伙伴們可以參考一下

藍牙，時下最流行的智能設(shè)備傳輸數(shù)據(jù)的方式之一，通過手機app和智能設(shè)備進行連接，獲取設(shè)備上的測量數(shù)據(jù)，我們生活中隨處可見的比如藍牙智能手環(huán)，藍牙電子秤，藍牙心電測量設(shè)備等等。

本篇我將緊接著上篇結(jié)尾所寫，一起來看下手機之間如何通過藍牙實現(xiàn)文字聊天。

先貼出上篇的一些demo；

當點擊圖上的兩個列表中的任何一個列表，執(zhí)行如下代碼：

mBtAdapter.cancelDiscovery();
String info = ((TextView) v).getText().toString();
String address = info.substring(info.length() - 17);
Intent intent = new Intent();
intent.putExtra(EXTRA_DEVICE_ADDRESS, address);
setResult(Activity.RESULT_OK, intent);
finish();

此藍牙聊天工具最后實現(xiàn)的效果是這樣的：

將回到聊天主界面：

public void onActivityResult(int requestCode, int resultCode, Intent data) {
 LogUtils.getInstance().e(getClass(), "onActivityResult " + resultCode);
 switch (requestCode) {
 case REQUEST_CONNECT_DEVICE:
 // 當DeviceListActivity返回與設(shè)備連接的消息
 if (resultCode == Activity.RESULT_OK) {
 // 連接設(shè)備的MAC地址
 String address = data.getExtras().getString(
 DeviceListActivity.EXTRA_DEVICE_ADDRESS);
 // 得到藍牙對象
 BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
 // 開始連接設(shè)備
 mChatService.connect(device);
 }
 break;
 case REQUEST_ENABLE_BT:
 // 判斷藍牙是否啟用
 if (resultCode == Activity.RESULT_OK) {
 // 建立連接
 setupChat();
 } else {
 LogUtils.getInstance().e(getClass(), "藍牙未啟用");
 Toast.makeText(this, R.string.bt_not_enabled_leaving,
 Toast.LENGTH_SHORT).show();
 finish();
 }
 }
}

在此，我將重點介紹下BluetoothChatService類中的連接流程；
因為藍牙聊天是兩個手機之間進行通訊，所以他們互為主機和從機，主要思路以及步驟如下：

1.開一個線程獲取socket去連接藍牙；
2.開一個線程獲監(jiān)聽藍牙傳入的連接，如果連接被接受的話，再開啟第三個線程去處理所有傳入和傳出的數(shù)據(jù)；

public synchronized void connect(BluetoothDevice device) {
 if (mState == STATE_CONNECTING) {
 if (mConnectThread != null) {
 mConnectThread.cancel();
 mConnectThread = null;
 }
 }
 if (mConnectedThread != null) {
 mConnectedThread.cancel();
 mConnectedThread = null;
 }
 mConnectThread = new ConnectThread(device);
 mConnectThread.start();
 setState(STATE_CONNECTING);
}

開線程去連接

/**
 * @description:藍牙連接線程
 * @author：zzq
 * @time: 2016-8-6 下午1:18:41
 */
private class ConnectThread extends Thread {
private final BluetoothSocket mmSocket;
private final BluetoothDevice mmDevice;
 public ConnectThread(BluetoothDevice device) {
 mmDevice = device;
 BluetoothSocket tmp = null;
 try {
 tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
 } catch (IOException e) {
 LogUtils.getInstance().e(getClass(), "socket獲取失?。? + e);
 }
 mmSocket = tmp;
 }
 public void run() {
 LogUtils.getInstance().e(getClass(), "開始mConnectThread");
 setName("ConnectThread");
 // mAdapter.cancelDiscovery();
 try {
 mmSocket.connect();
 } catch (IOException e) {
 // 連接失敗，更新ui
 connectionFailed();
 try {
 mmSocket.close();
 } catch (IOException e2) {
 LogUtils.getInstance().e(getClass(), "關(guān)閉連接失敗" + e2);
 }
 // 開啟聊天接收線程
 startChat();
 return;
 }
 synchronized (BluetoothChatService.this) {
 mConnectThread = null;
 }
 connected(mmSocket, mmDevice);
 }
 public void cancel() {
 try {
 mmSocket.close();
 } catch (IOException e) {
 LogUtils.getInstance().e(getClass(), "關(guān)閉連接失敗" + e);
 }
 }
}

/**
 * 監(jiān)聽傳入的連接
 */
private class AcceptThread extends Thread {
private final BluetoothServerSocket mmServerSocket;
 public AcceptThread() {
 BluetoothServerSocket tmp = null;
 try {
 tmp = mAdapter.listenUsingRfcommWithServiceRecord(NAME, MY_UUID);
 } catch (IOException e) {
 LogUtils.getInstance().e(getClass(), "--獲取socket失敗:" + e);
 }
 mmServerSocket = tmp;
 }

 public void run() {
 setName("AcceptThread");
 BluetoothSocket socket = null;
 while (mState != STATE_CONNECTED) {
 LogUtils.getInstance().e(getClass(), "----accept-循環(huán)執(zhí)行中-");
 try {
 socket = mmServerSocket.accept();
 } catch (IOException e) {
 LogUtils.getInstance().e(getClass(), "accept() 失敗" + e);
 break;
 }
// 如果連接被接受
 if (socket != null) {
 synchronized (BluetoothChatService.this) {
 switch (mState) {
 case STATE_LISTEN:
 case STATE_CONNECTING:
 // 開始連接線程
 connected(socket, socket.getRemoteDevice());
 break;
 case STATE_NONE:
 case STATE_CONNECTED:
 // 沒有準備好或已經(jīng)連接
 try {
 socket.close();
 } catch (IOException e) {
 LogUtils.getInstance().e(getClass(),"不能關(guān)閉這些連接" + e);
 }
 break;

 }
 }
 }
}
 LogUtils.getInstance().e(getClass(), "結(jié)束mAcceptThread");
}

 public void cancel() {
 LogUtils.getInstance().e(getClass(), "取消 " + this);
 try {
 mmServerSocket.close();
 } catch (IOException e) {
 LogUtils.getInstance().e(getClass(), "關(guān)閉失敗" + e);
 }
 }
}
/**
 * 連接成功后的線程 處理所有傳入和傳出的傳輸
 */
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
 public ConnectedThread(BluetoothSocket socket) {
 mmSocket = socket;
 InputStream tmpIn = null;
 OutputStream tmpOut = null;
 // 得到BluetoothSocket輸入和輸出流
 try {
 tmpIn = socket.getInputStream();
 tmpOut = socket.getOutputStream();
 } catch (IOException e) {
 LogUtils.getInstance().e(getClass(),"temp sockets not created" + e);
 }
 mmInStream = tmpIn;
 mmOutStream = tmpOut;
 }
 public void run() {
 int bytes;
 String str1 = "";
 // 循環(huán)監(jiān)聽消息
 while (true) {
 try {
 byte[] buffer = new byte[256];
 bytes = mmInStream.read(buffer);
 String readStr = new String(buffer, 0, bytes);// 字節(jié)數(shù)組直接轉(zhuǎn)換成字符串
 String str = bytes2HexString(buffer).replaceAll("00", "").trim();
 if (bytes > 0) {// 將讀取到的消息發(fā)到主線程
  mHandler.obtainMessage(BluetoothChatActivity.MESSAGE_READ, bytes, -1,buffer).sendToTarget();
 } else {
  LogUtils.getInstance().e(getClass(),"disconnected");
 connectionLost();
 if (mState != STATE_NONE) {
 LogUtils.getInstance().e(getClass(), "disconnected");
startChat();
 }
 break;
 }
 } catch (IOException e) {
 LogUtils.getInstance().e(getClass(), "disconnected" + e);
 connectionLost();
 if (mState != STATE_NONE) {
 // 在重新啟動監(jiān)聽模式啟動該服務(wù)
 startChat();
 }
 break;
 }
 }
}
/**
 * 寫入OutStream連接
 * 
 * @param buffer
 * 要寫的字節(jié)
 */
public void write(byte[] buffer) {
 try {
 mmOutStream.write(buffer);
 // 把消息傳給UI
 mHandler.obtainMessage(BluetoothChatActivity.MESSAGE_WRITE, -1,-1, buffer).sendToTarget();

 } catch (IOException e) {
 LogUtils.getInstance().e(getClass(),
"Exception during write:" + e);
 }

 }
public void cancel() {
 try {
 mmSocket.close();
 } catch (IOException e) {
 LogUtils.getInstance().e(getClass(),"close() of connect socket failed:" + e);
 }
 }
 }

大概的流程就是上面三個線程里面所展現(xiàn)的，當然具體情況，根據(jù)項目來，比如藍牙協(xié)議協(xié)議解析這塊的根據(jù)協(xié)議定義的方式來進行解析;

代碼中牽扯的到的藍牙連接狀態(tài)的改變，用到的handle，直接把狀態(tài)發(fā)送至activity，通知activity更新；

 /**
 * 無法連接，通知Activity
 */
private void connectionFailed() {
 setState(STATE_LISTEN);
 Message msg = mHandler.obtainMessage(BluetoothChatActivity.MESSAGE_TOAST);
 Bundle bundle = new Bundle();
 bundle.putString(BluetoothChatActivity.TOAST, "無法連接設(shè)備");
 msg.setData(bundle);
 mHandler.sendMessage(msg);
}
/**
 * 設(shè)備斷開連接，通知Activity
 */
private void connectionLost() {
 Message msg = mHandler.obtainMessage(BluetoothChatActivity.MESSAGE_TOAST);
 Bundle bundle = new Bundle();
 bundle.putString(BluetoothChatActivity.TOAST, "設(shè)備斷開連接");
 msg.setData(bundle);
 mHandler.sendMessage(msg);
}

當點擊發(fā)送按鈕時，將文本輸入框中的文字發(fā)送數(shù)據(jù)的方法：

private void sendMessage(String message) {
 if (mChatService.getState() != BluetoothChatService.STATE_CONNECTED) {
 Toast.makeText(this, R.string.not_connected,Toast.LENGTH_SHORT).show();
 return;
}
 if (message.length() > 0) {
 byte[] send = message.getBytes();
 mChatService.write(send);
 }
}
//調(diào)用BluetoothChatService類中的write進行數(shù)據(jù)發(fā)送
public void write(byte[] out) {
 ConnectedThread r;
 synchronized (this) {
 if (mState != STATE_CONNECTED)
 return;
 r = mConnectedThread;
 }
 r.write(out);
}

如此，藍牙聊天的流程就是這樣，如果退出聊天的時候，停止所有線程；

public synchronized void stop() {
 LogUtils.getInstance().e(getClass(), "---stop()");
 setState(STATE_NONE);
 if (mConnectThread != null) {
 mConnectThread.cancel();
 mConnectThread = null;
}
 if (mConnectedThread != null) {
 mConnectedThread.cancel();
 mConnectedThread = null;
}
 if (mAcceptThread != null) {
 mAcceptThread.cancel();
 mAcceptThread = null;
 }
}

相信看完本篇文章，在安卓藍牙連接這塊應(yīng)該問題不大了（spp協(xié)議）。

源碼地址：點我查看源碼

以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。

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