1.头文件

#pragma once

#include <QtWidgets/QMainWindow>
#include "ui_QtGuiApplication1.h"
#include <QSystemTrayIcon>

class QtGuiApplication1 : public QMainWindow
{
    Q_OBJECT

public:
    QtGuiApplication1(QWidget *parent = Q_NULLPTR);

private:
    Ui::QtGuiApplication1Class ui;
public:
    QSystemTrayIcon* m_sysTrayIcon;
    QMenu* m_menu;
    QAction* m_showWindow;
    QAction* m_exit;

public:
    void createActions();   //创建菜单按钮
    void createMenu();      //创建菜单

private slots:
    void activatedSysTrayIcon(QSystemTrayIcon::ActivationReason reason);
    void showWindow();      //显示窗口
    void exitApplication(); //退出程序
};

2.源文件

#include "QtGuiApplication1.h"

#include <QIcon>
QtGuiApplication1::QtGuiApplication1(QWidget *parent)
    : QMainWindow(parent)
{
    ui.setupUi(this);

    m_sysTrayIcon = new QSystemTrayIcon(this);
    QIcon icon = QIcon(":/Resources/5.jpg");    //新建托盘要显示的icon（没有图片不会在任务栏显示）
    m_sysTrayIcon->setIcon(icon);   //设置图标
    m_sysTrayIcon->setToolTip(QStringLiteral("测试系统托盘图标"));    //当鼠标移动到托盘上的图标时，会显示此处设置的内容
    //给QSystemTrayIcon添加槽函数
    connect(m_sysTrayIcon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)), this, SLOT(on_activatedSysTrayIcon(QSystemTrayIcon::ActivationReason)));

    createActions();
    createMenu();
    m_sysTrayIcon->show();    //在系统托盘显示此对象
}



void QtGuiApplication1::activatedSysTrayIcon(QSystemTrayIcon::ActivationReason reason)
{
    switch (reason) {
    case QSystemTrayIcon::Trigger:
        m_sysTrayIcon->showMessage(QStringLiteral("测试"),QStringLiteral("欢迎使用此程序"),
            QSystemTrayIcon::Information,1000);
        break;
    case QSystemTrayIcon::DoubleClick:
        this->show();
        break;
    default:
        break;
    }
}

void QtGuiApplication1::createActions()
{
    m_showWindow = new QAction(QStringLiteral("显示主界面"), this);
    connect(m_showWindow, SIGNAL(triggered()), this, SLOT(showWindow()));

    m_exit = new QAction(QStringLiteral("退出"), this);
    connect(m_exit, SIGNAL(triggered()), this, SLOT(exitApplication()));

}

void QtGuiApplication1::createMenu()
{
    m_menu = new QMenu(this);
    m_menu->addAction(m_showWindow);
    m_menu->addSeparator();
    m_menu->addAction(m_exit);
    m_sysTrayIcon->setContextMenu(m_menu);
}

void QtGuiApplication1::showWindow()
{
    this->show();
}

void QtGuiApplication1::exitApplication()
{
    exit(0);
}

3.测试结果

image.png