【移動應(yīng)用開發(fā)技術(shù)】Android中怎么實現(xiàn)一個BLE通信軟件

【移動應(yīng)用開發(fā)技術(shù)】Android中怎么實現(xiàn)一個BLE通信軟件

本文源碼/upload/information/20210522/379/526217.jpg具體實現(xiàn)/upload/information/20210522/379/526221.jpg/upload/information/20210522/379/526223.jpg2.掃描設(shè)備Widget::Widget(QWidget

*parent)

:

QWidget(parent)

,

ui(new

Ui::Widget)

{

ui->setupUi(this);

//創(chuàng)建搜索服務(wù)：https://doc.qt.io/qt-5/qbluetoothdevicediscoveryagent.html

discoveryAgent

=new

QBluetoothDeviceDiscoveryAgent(this);

//設(shè)置BLE的搜索時間

discoveryAgent->setLowEnergyDiscoveryTimeout(20000);

connect(discoveryAgent,SIGNAL(deviceDiscovered(QBluetoothDeviceInfo)),this,SLOT(addBlueToothDevicesToList(QBluetoothDeviceInfo)));//找到設(shè)備之后添加到列表顯示出來

connect(discoveryAgent,

SIGNAL(finished()),

this,

SLOT(scanFinished()));

connect(discoveryAgent,

SIGNAL(canceled()),

this,

SLOT(scanCanceled()));

connect(this,

SIGNAL(returnAddress(QBluetoothDeviceInfo)),

this,

SLOT(createCtl(QBluetoothDeviceInfo)));

//開始進行設(shè)備搜索

discoveryAgent->start(QBluetoothDeviceDiscoveryAgent::LowEnergyMethod);

}3.將掃描結(jié)果添加到QListWidget中//deviceDiscovered

signals

對應(yīng)的槽函數(shù)

void

Widget::addBlueToothDevicesToList(const

QBluetoothDeviceInfo

&info)

{

if

(info.coreConfigurations()

&

QBluetoothDeviceInfo::LowEnergyCoreConfiguration)

//獲取設(shè)備信息，并判斷該設(shè)備是否為BLE設(shè)備

{

//格式化設(shè)備地址和設(shè)備名稱

QString

label

=

QString("%1

%2").arg(info.address().toString()).arg(());

//檢查設(shè)備是否已存在，避免重復添加

QList<QListWidgetItem

*>

items

=

ui->ctrBleList->findItems(label,

Qt::MatchExactly);

//不存在則添加至設(shè)備列表

if

(items.empty())

{

QListWidgetItem

*item

=

new

QListWidgetItem(label);

ui->ctrBleList->addItem(item);

devicesList.append(info);

}

}

}4.連接藍牙，停止掃描void

Widget::on_btnConnectBle_clicked()

{

//確認選取了某一個藍牙設(shè)備

if(!ui->ctrBleList->currentItem()->text().isEmpty())

{

//獲取選擇的地址

QString

bltAddress

=

ui->ctrBleList->currentItem()->text().left(17);

for

(int

i

=

0;

i<devicesList.count();

i++)

{

//地址對比

if(devicesList.at(i).address().toString().left(17)

==

bltAddress)

{

QBluetoothDeviceInfo

choosenDevice

=

devicesList.at(i);

//發(fā)送自定義signals==>執(zhí)行slots:createCtl

emit

returnAddress(choosenDevice);

//停止搜索服務(wù)

discoveryAgent->stop();

break;

}

}

}

}5.獲取特征void

Widget::searchCharacteristic()

{

if(m_bleServer)

{

QList<QLowEnergyCharacteristic>

list=m_bleServer->characteristics();

qDebug()<<"[xiaohage]list.count()="<<list.count();

//遍歷characteristics

for(int

i=0;i<list.count();i++)

{

QLowEnergyCharacteristic

c=list.at(i);

/*如果QLowEnergyCharacteristic對象有效，則返回true，否則返回false*/

if(c.isValid())

{

//返回特征的屬性。

//這些屬性定義了特征的訪問權(quán)限。

if(perties()

&

QLowEnergyCharacteristic::WriteNoResponse

||

perties()

&

QLowEnergyCharacteristic::Write)

{

ui->ctrSystemLogInfo->insertPlainText("\n具有寫權(quán)限!");

m_writeCharacteristic

=

c;

//保存寫權(quán)限特性

if(perties()

&

QLowEnergyCharacteristic::WriteNoResponse)

{

m_writeMode

=

QLowEnergyService::WriteWithoutResponse;

}

else

{

m_writeMode

=

QLowEnergyService::WriteWithResponse;

}

}

if(perties()

&

QLowEnergyCharacteristic::Read)

{

m_readCharacteristic

=

c;

//保存讀權(quán)限特性

}

//描述符定義特征如何由特定客戶端配置。

m_notificationDesc

=

c.descriptor(QBluetoothUuid::ClientCharacteristicConfiguration);

//值為真

if(m_notificationDesc.isValid())

{

//寫描述符

m_bleServer->writeDescriptor(m_notificationDesc,

QByteArray::fromHex("0100"));

ui->ctrSystemLogInfo->insertPlainText("\n寫描述符!");

}

}

}

}

}6.發(fā)送數(shù)據(jù)void

Widget::SendMsg(QString

text)

{

QByteArray

array=text.toLocal8Bit();

m_bleServer->writeCharacteristic(m_writeCharacteristic,array,

m_writeMode);

}

void

Widget::on_btnSendData_clicked()

{

SendMsg("Hello

World");

}7.寫入數(shù)據(jù)void

Widget::BleServiceCharacteristicRead(const

QLowEnergyCharacteristic

&c,const

QByteArray

&value)

{

Q_UNUSED(c)

ui->ctrSystemLogInfo->insertPlainText("\n當特征讀取請求成功返回其值時：");

ui->ctrSystemLogInfo->insertPlainText(QString(value));

}8.斷開連接Widget::~Widget()

{

if(!(m_BLEController->state()

==

QLowEnergyController::UnconnectedState))

m_BLEController->disconnectFromDevice();//從設(shè)備斷開鏈接

delete

ui;

}界面布局/upload/infor