Android实现蓝牙的搜索，配对（不需要输入PIN，自动匹配），连接，通信
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2022-12-25 12:32:50
android实现蓝牙的搜索，配对（不需要输入pin，自动匹配），连接，通信
一、蓝牙设置权限
需要在androidmanifest.xml配置获得蓝牙权限。
按照sdk说明需要下面两个权限就可以进...
android实现蓝牙的搜索，配对（不需要输入pin，自动匹配），连接，通信
一、蓝牙设置权限
需要在androidmanifest.xml配置获得蓝牙权限。
按照sdk说明需要下面两个权限就可以进行蓝牙的开发。
在android6.0之后为了更好的保护用户的数据安全，所有需要访问硬件唯一标识符的地方都需要申请位置权限，也就是需要申请以下权限
二、蓝牙搜索
1.首先需要获得蓝牙适配器。
mbluetoothadapter = bluetoothadapter.getdefaultadapter();
2.判断蓝牙是否打开，然后请求打开蓝牙
private void openbluetooth() {
if (!mbluetoothadapter.isenabled()) {
//通过这个方法来请求打开我们的蓝牙设备
intent intent = new intent(bluetoothadapter.action_request_enable);
startactivityforresult(intent,bluetooth_response);
}
}
通过这个方法可以判断是否允许打开蓝牙，然后进行下面相应的操作
case bluetooth_response:
if(resultcode == result_ok){
//获得蓝牙权限成功
//需要再写一次，oncreate里的下面的方法无法执行
duringdialog("正在连接蓝牙！");
//搜索蓝牙
searchbluetooth();
}else if(resultcode == result_canceled){
//获得蓝牙权限失败
toast(controlparkingactivity.this,"蓝牙权限获取失败，请打开蓝牙！");
}
break;
3.搜索蓝牙
如果已经打开蓝牙上面的搜索蓝牙不会执行，所以还需在oncreate方法中写搜索方法
//请求判断蓝牙是否提前打开
//如果没有提前打开则不会执行这句，执行openbluetooth的响应结果
//如果提前打开则执行下面
if(mbluetoothadapter.isenabled()){
duringdialog("正在连接蓝牙！");
searchbluetooth();
}
搜索蓝牙方法如下：
//搜索蓝牙设备
private void searchbluetooth() {
//判断蓝牙是否已经绑定
if(isbond()){
log.d(tag,"蓝牙已经绑定");
//已经绑定，直接连接蓝牙
log.d(tag,device.getname() + "1");
}else{
log.d(tag,"搜索蓝牙中");
//搜索蓝牙设备
mbluetoothadapter.startdiscovery();
}
}
三、蓝牙配对
蓝牙配对是通过广播接收器，搜索附近蓝牙设备，通过判断设备的address和name来判断是否为目标设备。之后利用clsutils工具类实现自动匹配蓝牙设备的功能。
1.动态注册广播接收器
mbluetoothreceiver = new bluetoothreceiver();
// 动态注册注册广播接收器。接收蓝牙发现讯息
intentfilter btfilter = new intentfilter();
btfilter.setpriority(1000);
btfilter.addaction(bluetoothdevice.action_found);
btfilter.addaction(bluetoothdevice.action_pairing_request);
this.registerreceiver(mbluetoothreceiver,btfilter);
//设置广播信息接口监听器
mbluetoothreceiver.setreceivermessagelistener(this);
setpriority(1000)：设置优先级，如果优先级比较低可能仍然会弹出输入pin的对话框
bluetoothdevice.action_found：发现设备时的action
bluetoothdevice.action_pairing_request：当调用createbond（）后就会发起bluetoothdevice.action_pairing_request的广播
2.判断蓝牙设备是否为目标设备，并且创建绑定
//获得action
string action=intent.getaction();
//获取设备
device = intent.getparcelableextra(bluetoothdevice.extra_device);
//获取搜索到的设备的名称和地址
string name = device.getname();
string address = device.getaddress();
if(action.equals(bluetoothdevice.action_found))
{
log.d(tag, "发现设备:" + name);
if ((name != null && btname.equals(name)) || btaddress.equals(address)) {
//判断远程设备是否已经被绑定
if(device.getbondstate() != bluetoothdevice.bond_bonded){
log.d(tag, "发现目标设备，开始配对!");
try {
// 调用配对的方法，此方法是异步的，系统会触发bluetoothdevice.action_pairing_request的广播
// 收到此广播后，设置配对的密码
clsutils.createbond(bluetoothdevice.class, device);
} catch (exception e) {
e.printstacktrace();
}
}else{
//远程设备已经被绑定，取消搜索，返回信息
}
}
3.利用clsutils和事先获得的pin进行配对
else if(action.equals("android.bluetooth.device.action.pairing_request")){
//createbond后再次得到action，就会等于pairing_request
log.d(tag,"action2 = " + action);
log.d(tag, "发现设备:" + device.getaddress() + " " + device.getname());
if ((name != null && name.equals(btname)) || address.equals(btaddress)) {
log.d(tag, "发现目标设备，开始配对!");
try {
//1.确认配对
// clsutils.setpairingconfirmation(device.getclass(), device, true);
// //2.终止有序广播
// log.i("order...", "isorderedbroadcast:"+isorderedbroadcast()+",isinitialstickybroadcast:"+isinitialstickybroadcast());
abortbroadcast();//如果没有将广播终止，则会出现一个一闪而过的配对框。
//3.调用setpin方法进行配对...
boolean ret = clsutils.setpin(device.getclass(), device, pin);
mreceivermessage.setmessage(device);
} catch (exception e) {
// todo auto-generated catch block
e.printstacktrace();
log.d(tag,"action2 = 配对失败！");
}
}else {
//提示不是目标设备
log.d(tag,"action2 = 不是目标设备！");
}
}
4.将绑定状态返回给activity，通知其绑定成功，可以进行蓝牙连接
广播中无法直接调用蓝牙连接的方法，在试了很多种方法后，最后通过接口实现了广播向activity传值的功能。
在bluetoothreceiver中写接口和接口监听器
public interface bluetoothreceivermessage{
public void setmessage(bluetoothdevice device);
}
public void setreceivermessagelistener(bluetoothreceivermessage bluetoothreceivermessage){
this.mreceivermessage = bluetoothreceivermessage;
}
绑定成功后，向activity发送消息（绑定设备）
mreceivermessage.setmessage(device);
首先activity中要设置广播信息接口监听器
//设置广播信息接口监听器
mbluetoothreceiver.setreceivermessagelistener(this);
在activity中需要实现bluetoothreceivermessage接口，重写对应的方法，进行蓝牙连接操作。
public class controlparkingactivity extends appcompatactivity implements bluetoothreceiver.bluetoothreceivermessage
@override
public void setmessage(bluetoothdevice device) {
if(device != null){
log.d(tag,"蓝牙绑定成功，开始连接！");
this.device = device;
mchatservice.connect(device,true);
}
}
四、蓝牙连接和通信
利用google官方的bluetoothservice进行蓝牙的连接和通信。
1.初始化bluetoothservice
mchatservice = new bluetoothchatservice(this, mhandler);
2.通过handle获取bluetoothservice返回的信息和接收的数据
private final handler mhandler = new handler() {
@override
public void handlemessage(message msg) {
switch (msg.what) {
case message_state_change:
switch (msg.arg1) {
case bluetoothchatservice.state_connected:
//蓝牙已连接
break;
case bluetoothchatservice.state_connecting:
//蓝牙正在连接
break;
case bluetoothchatservice.state_listen:
case bluetoothchatservice.state_none:
//蓝牙未连接
break;
}
break;
case message_write:
//发送数据返回的结果
break;
case message_read:
byte[] readbuf = (byte[]) msg.obj;
// construct a string from the valid bytes in the buffer
string readmessage = new string(readbuf, 0, msg.arg1);
//读取数据
case message_device_name:
// 保存已连接的设备名称
mconnecteddevicename = msg.getdata().getstring(device_name);
toast.maketext(getapplicationcontext(), "connected to "
+ mconnecteddevicename, toast.length_short).show();
break;
case message_toast:
break;
}
}
};
3.向蓝牙设备发送数据
private void sendmessage(string message) {
// check that we're actually connected before trying anything
if (mchatservice.getstate() != bluetoothchatservice.state_connected) {
toast.maketext(this, r.string.not_connected, toast.length_short).show();
return;
}
// check that there's actually something to send
if (message.length() > 0) {
// get the message bytes and tell the bluetoothchatservice to write
byte[] send = message.getbytes();
mchatservice.write(send);
}
}
五、结束连接、通信
动态注册广播需要在活动结束时解除注册，如果有需要也可以调用clsutils.removebond解除绑定。
@override
protected void ondestroy() {
super.ondestroy();
mbluetoothadapter.canceldiscovery();
unregisterreceiver(mbluetoothreceiver);
try {
log.d(tag,device + " " + device.getbondstate());
clsutils.removebond(device.getclass(), device);
} catch (exception e) {
log.d(tag,"解除绑定失败！");
e.printstacktrace();
}
}
六、另附bluetoothchatservice代码
/*
* copyright (c) 2009 the android open source project
*
* licensed under the apache license, version 2.0 (the "license");
* you may not use this file except in compliance with the license.
* you may obtain a copy of the license at
*
* https://www.apache.org/licenses/license-2.0
*
* unless required by applicable law or agreed to in writing, software
* distributed under the license is distributed on an "as is" basis,
* without warranties or conditions of any kind, either express or implied.
* see the license for the specific language governing permissions and
* limitations under the license.
*/
package com.example.sharingparking.utils;
import android.bluetooth.bluetoothadapter;
import android.bluetooth.bluetoothdevice;
import android.bluetooth.bluetoothserversocket;
import android.bluetooth.bluetoothsocket;
import android.content.context;
import android.os.bundle;
import android.os.handler;
import android.os.message;
import android.util.log;
import com.example.sharingparking.activity.controlparkingactivity;
import java.io.ioexception;
import java.io.inputstream;
import java.io.outputstream;
import java.util.uuid;
/**
* this class does all the work for setting up and managing bluetooth
* connections with other devices. it has a thread that listens for
* incoming connections, a thread for connecting with a device, and a
* thread for performing data transmissions when connected.
*/
public class bluetoothchatservice{
// debugging
private static final string tag = "bluetoothchatservice";
private static final boolean d = true;
// name for the sdp record when creating server socket
private static final string name_secure = "bluetoothchatsecure";
private static final string name_insecure = "bluetoothchatinsecure";
// unique uuid for this application
private static final uuid my_uuid_secure =
uuid.fromstring("00001101-0000-1000-8000-00805f9b34fb");
private static final uuid my_uuid_insecure =
uuid.fromstring("00001101-0000-1000-8000-00805f9b34fb");
// member fields
private final bluetoothadapter madapter;
private final handler mhandler;
private acceptthread msecureacceptthread;
private acceptthread minsecureacceptthread;
private connectthread mconnectthread;
private connectedthread mconnectedthread;
private int mstate;
// constants that indicate the current connection state
public static final int state_none = 0; // 蓝牙未连接
public static final int state_listen = 1; // 正在监听来的连接
public static final int state_connecting = 2; // 正在连接
public static final int state_connected = 3; // 已经连接
/**
* constructor. prepares a new mainactivity session.
* @param context the ui activity context
* @param handler a handler to send messages back to the ui activity
*/
public bluetoothchatservice(context context, handler handler) {
madapter = bluetoothadapter.getdefaultadapter();
mstate = state_none;
mhandler = handler;
}
/**
* set the current state of the chat connection
* @param state an integer defining the current connection state
*/
private synchronized void setstate(int state) {
if (d) log.d(tag, "setstate() " + mstate + " -> " + state);
mstate = state;
//通过handle返回给主活动连接状态
mhandler.obtainmessage(controlparkingactivity.message_state_change, state, -1).sendtotarget();
}
/**
* return the current connection state. */
public synchronized int getstate() {
return mstate;
}
/**
* start the chat service. specifically start acceptthread to begin a
* session in listening (server) mode. called by the activity onresume() */
public synchronized void start() {
if (d) log.d(tag, "start");
// cancel any thread attempting to make a connection
if (mconnectthread != null)
{
mconnectthread.cancel();
mconnectthread = null;
}
// cancel any thread currently running a connection
if (mconnectedthread != null)
{
mconnectedthread.cancel();
mconnectedthread = null;
}
setstate(state_listen);
// start the thread to listen on a bluetoothserversocket
if (msecureacceptthread == null)
{
msecureacceptthread = new acceptthread(true);
msecureacceptthread.start();
}
if (minsecureacceptthread == null)
{
minsecureacceptthread = new acceptthread(false);
minsecureacceptthread.start();
}
}
/**
* start the connectthread to initiate a connection to a remote device.
* @param device the bluetoothdevice to connect
* @param secure socket security type - secure (true) , insecure (false)
*/
public synchronized void connect(bluetoothdevice device, boolean secure) {
if (d) log.d(tag, "connect to: " + device);
// cancel any thread attempting to make a connection
if (mstate == state_connecting) {
if (mconnectthread != null) {mconnectthread.cancel(); mconnectthread = null;}
}
// cancel any thread currently running a connection
if (mconnectedthread != null) {mconnectedthread.cancel(); mconnectedthread = null;}
// start the thread to connect with the given device
mconnectthread = new connectthread(device, secure);
mconnectthread.start();
setstate(state_connecting);
}
/**
* start the connectedthread to begin managing a bluetooth connection
* @param socket the bluetoothsocket on which the connection was made
* @param device the bluetoothdevice that has been connected
*/
public synchronized void connected(bluetoothsocket socket, bluetoothdevice
device, final string sockettype) {
if (d) log.d(tag, "connected, socket type:" + sockettype);
// cancel the thread that completed the connection
if (mconnectthread != null) {mconnectthread.cancel(); mconnectthread = null;}
// cancel any thread currently running a connection
if (mconnectedthread != null) {mconnectedthread.cancel(); mconnectedthread = null;}
// cancel the accept thread because we only want to connect to one device
if (msecureacceptthread != null) {
msecureacceptthread.cancel();
msecureacceptthread = null;
}
if (minsecureacceptthread != null) {
minsecureacceptthread.cancel();
minsecureacceptthread = null;
}
// start the thread to manage the connection and perform transmissions
mconnectedthread = new connectedthread(socket, sockettype);
mconnectedthread.start();
// send the name of the connected device back to the ui activity
message msg = mhandler.obtainmessage(controlparkingactivity.message_device_name);
bundle bundle = new bundle();
bundle.putstring(controlparkingactivity.device_name, device.getname());
msg.setdata(bundle);
mhandler.sendmessage(msg);
setstate(state_connected);
}
/**
* stop all threads
*/
public synchronized void stop() {
if (d) log.d(tag, "stop");
if (mconnectthread != null) {
mconnectthread.cancel();
mconnectthread = null;
}
if (mconnectedthread != null) {
mconnectedthread.cancel();
mconnectedthread = null;
}
if (msecureacceptthread != null) {
msecureacceptthread.cancel();
msecureacceptthread = null;
}
if (minsecureacceptthread != null) {
minsecureacceptthread.cancel();
minsecureacceptthread = null;
}
setstate(state_none);
}
/**
* write to the connectedthread in an unsynchronized manner
* @param out the bytes to write
* @see connectedthread#write(byte[])
*/
public void write(byte[] out) {
// create temporary object
connectedthread r;
// synchronize a copy of the connectedthread
synchronized (this) {
if (mstate != state_connected) return;
r = mconnectedthread;
}
// perform the write unsynchronized
r.write(out);
}
/**
* indicate that the connection attempt failed and notify the ui activity.
*/
private void connectionfailed() {
// send a failure message back to the activity
message msg = mhandler.obtainmessage(controlparkingactivity.message_toast);
bundle bundle = new bundle();
bundle.putstring(controlparkingactivity.toast, "unable to connect device");
msg.setdata(bundle);
mhandler.sendmessage(msg);
// start the service over to restart listening mode
bluetoothchatservice.this.start();
}
/**
* indicate that the connection was lost and notify the ui activity.
*/
private void connectionlost() {
// send a failure message back to the activity
message msg = mhandler.obtainmessage(controlparkingactivity.message_toast);
bundle bundle = new bundle();
bundle.putstring(controlparkingactivity.toast, "device connection was lost");
msg.setdata(bundle);
mhandler.sendmessage(msg);
// start the service over to restart listening mode
bluetoothchatservice.this.start();
}
/**
* this thread runs while listening for incoming connections. it behaves
* like a server-side client. it runs until a connection is accepted
* (or until cancelled).
*/
private class acceptthread extends thread {
// the local server socket
private final bluetoothserversocket mmserversocket;
private string msockettype;
public acceptthread(boolean secure) {
bluetoothserversocket tmp = null;
msockettype = secure ? "secure":"insecure";
// create a new listening server socket
try {
if (secure) {
tmp = madapter.listenusingrfcommwithservicerecord(name_secure,
my_uuid_secure);
} else {
tmp = madapter.listenusinginsecurerfcommwithservicerecord(
name_insecure, my_uuid_insecure);
}
} catch (ioexception e) {
log.e(tag, "socket type: " + msockettype + "listen() failed", e);
}
mmserversocket = tmp;
}
public void run() {
if (d) log.d(tag, "socket type: " + msockettype +
"begin macceptthread" + this);
setname("acceptthread" + msockettype);
bluetoothsocket socket = null;
// listen to the server socket if we're not connected
while (mstate != state_connected) {
try {
// this is a blocking call and will only return on a
// successful connection or an exception
socket = mmserversocket.accept();
} catch (ioexception e) {
log.e(tag, "socket type: " + msockettype + "accept() failed", e);
break;
}
// if a connection was accepted
if (socket != null) {
synchronized (bluetoothchatservice.this) {
switch (mstate) {
case state_listen:
case state_connecting:
// situation normal. start the connected thread.
connected(socket, socket.getremotedevice(),
msockettype);
break;
case state_none:
case state_connected:
// either not ready or already connected. terminate new socket.
try {
socket.close();
} catch (ioexception e) {
log.e(tag, "could not close unwanted socket", e);
}
break;
}
}
}
}
if (d) log.i(tag, "end macceptthread, socket type: " + msockettype);
}
public void cancel() {
if (d) log.d(tag, "socket type" + msockettype + "cancel " + this);
try {
mmserversocket.close();
} catch (ioexception e) {
log.e(tag, "socket type" + msockettype + "close() of server failed", e);
}
}
}
/**
* this thread runs while attempting to make an outgoing connection
* with a device. it runs straight through; the connection either
* succeeds or fails.
*/
private class connectthread extends thread {
private final bluetoothsocket mmsocket;
private final bluetoothdevice mmdevice;
private string msockettype;
public connectthread(bluetoothdevice device, boolean secure) {
mmdevice = device;
bluetoothsocket tmp = null;
msockettype = secure ? "secure" : "insecure";
// get a bluetoothsocket for a connection with the
// given bluetoothdevice
try {
if (secure) {
tmp = device.createrfcommsockettoservicerecord(
my_uuid_secure);
} else {
tmp = device.createinsecurerfcommsockettoservicerecord(
my_uuid_insecure);
}
} catch (ioexception e) {
log.e(tag, "socket type: " + msockettype + "create() failed", e);
}
mmsocket = tmp;
}
public void run() {
log.i(tag, "begin mconnectthread sockettype:" + msockettype);
setname("connectthread" + msockettype);
// always cancel discovery because it will slow down a connection
madapter.canceldiscovery();
// make a connection to the bluetoothsocket
try {
// this is a blocking call and will only return on a
// successful connection or an exception
mmsocket.connect();
} catch (ioexception e) {
// close the socket
try {
mmsocket.close();
} catch (ioexception e2) {
log.e(tag, "unable to close() " + msockettype +
" socket during connection failure", e2);
}
connectionfailed();
return;
}
// reset the connectthread because we're done
synchronized (bluetoothchatservice.this) {
mconnectthread = null;
}
// start the connected thread
connected(mmsocket, mmdevice, msockettype);
}
public void cancel() {
try {
mmsocket.close();
} catch (ioexception e) {
log.e(tag, "close() of connect " + msockettype + " socket failed", e);
}
}
}
/**
* this thread runs during a connection with a remote device.
* it handles all incoming and outgoing transmissions.
*/
private class connectedthread extends thread {
private final bluetoothsocket mmsocket;
private final inputstream mminstream;
private final outputstream mmoutstream;
public connectedthread(bluetoothsocket socket, string sockettype) {
log.d(tag, "create connectedthread: " + sockettype);
mmsocket = socket;
inputstream tmpin = null;
outputstream tmpout = null;
// get the bluetoothsocket input and output streams
try {
tmpin = socket.getinputstream();
tmpout = socket.getoutputstream();
} catch (ioexception e) {
log.e(tag, "temp sockets not created", e);
}
mminstream = tmpin;
mmoutstream = tmpout;
}
public void run() {
log.i(tag, "begin mconnectedthread");
byte[] buffer = new byte[1024];
int bytes;
// keep listening to the inputstream while connected
while (true) {
try {
// read from the inputstream
bytes = mminstream.read(buffer);
// send the obtained bytes to the ui activity
mhandler.obtainmessage(controlparkingactivity.message_read, bytes, -1, buffer).sendtotarget();
} catch (ioexception e) {
log.e(tag, "disconnected", e);
connectionlost();
// start the service over to restart listening mode
bluetoothchatservice.this.start();
break;
}
}
}
/**
* write to the connected outstream.
* @param buffer the bytes to write
*/
public void write(byte[] buffer) {
try {
mmoutstream.write(buffer);
// share the sent message back to the ui activity
mhandler.obtainmessage(controlparkingactivity.message_write, -1, -1, buffer).sendtotarget();
} catch (ioexception e) {
log.e(tag, "exception during write", e);
}
}
public void cancel() {
try {
mmsocket.close();
} catch (ioexception e) {
log.e(tag, "close() of connect socket failed", e);
}
}
}
}
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