QT设计实现音乐播放器的基本功能

蔚落 2022-12-27 02:23 202阅读 0赞

通过QT对madplay的应用，实现音乐播放器的功能，包括开始播放、暂停播放、继续播放、终止播放、播放上一首、播放下一首、添加指定目录下的音乐、删除指定歌曲、清空列表。应用到QFileDialog、QStringList等类，最后可以通过交叉编译移植到开发板上运行。

界面效果如下图：

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc5MzE4MQ_size_16_color_FFFFFF_t_70]

具体代码如下：  
player.h

#ifndef PLAYER_H
    #define PLAYER_H
    
    #include <QDialog>
    #include <QWidget>
    #include <QProcess>
    #include <QFileDialog>
    
    namespace Ui { 
    class player;
    }
    
    class player : public QDialog
    { 
        Q_OBJECT
    
    public:
        explicit player(QWidget *parent = 0);
        ~player();
    
    private slots:
        void on_pushButton_close_clicked();
    
        void on_pushButton_start_clicked();
    
        void on_pushButton_add_clicked();
    
        void on_listWidget_itemDoubleClicked();
    
        void on_pushButton_stop_clicked();
    
        void on_pushButton_prev_clicked();
    
        void on_pushButton_next_clicked();
    
        void on_pushButton_clear_clicked();
    
        void on_pushButton_delete_clicked();
    
        void on_pushButton_exit_clicked();
    
    private:
        Ui::player *ui;
        QProcess *p;
        QString Music_path;
    };
    
    #endif // PLAYER_H

player.cpp

#include "player.h"
    #include "ui_player.h"
    #include <QDebug>
    
    player::player(QWidget *parent) :
        QDialog(parent),
        ui(new Ui::player)
    { 
        ui->setupUi(this);
    
        p = new QProcess(this);
        ui->pushButton_stop->setEnabled(false);                                                                        //失能暂停按钮
    
    // this->setAutoFillBackground(true); //自定义背景
    // QPalette palette = this->palette();
    // palette.setBrush(QPalette::Window,QBrush(QPixmap("./background.jpeg"). //使用平滑的缩放方式
    // scaled(this->size(),Qt::IgnoreAspectRatio,Qt::SmoothTransformation)));
    // this->setPalette(palette); //给widget加上背景图
    }
    
    player::~player()
    { 
        delete ui;
        p->kill();
        p->waitForFinished();
    }
    
    void player::on_pushButton_close_clicked()                                                                         //终止播放
    { 
        p->kill();                                                                                                     //关闭播放器
        p->waitForFinished();                                                                                          //等待关闭
        ui->pushButton_stop->setEnabled(false);                                                                        //失能暂停按钮
    }
    
    void player::on_pushButton_start_clicked()
    { 
        if(p->state() == QProcess::Running)                                                                            //如果有音乐在播放
        { 
            on_pushButton_close_clicked();                                                                             //终止播放
        }
    
        QString buf = QString("madplay");
        QStringList args;
        Music_path = ui->listWidget->currentItem()->text();                                                            //记录当前播放的音乐
        args<<Music_path<<"&";
        p->start(buf,args);                                                                                            //执行QString命令
    
        ui->pushButton_stop->setText("暂停");                                                                           //重置暂停按钮
        ui->pushButton_stop->setEnabled(true);                                                                         //使能暂停按钮
    }
    
    void player::on_pushButton_add_clicked()                                                                           //添加音乐
    { 
        QStringList music_files =  QFileDialog::getOpenFileNames(this,"选择音乐文件","./music","*.mp3 *.WAV");
    
        for(int i = 0; i < ui->listWidget->count(); i++)                                                               //去重
        { 
            for(int j = 0; j < music_files.count(); j++)
            { 
                if(ui->listWidget->item(i)->text() == music_files.at(j))
                { 
                    music_files.removeAt(j);
                    break;
                }
            }
        }
        ui->listWidget->addItems(music_files);                                                                         //将文件添加到listWidget
        ui->listWidget->setCurrentRow(0);                                                                              //定位
    }
    
    void player::on_listWidget_itemDoubleClicked()                                                                     //双击播放音乐
    { 
        on_pushButton_start_clicked();
    }
    
    void player::on_pushButton_stop_clicked()                                                                          //暂停播放、继续播放音乐
    { 
        QString buf = QString("killall");
        QStringList args;
    
        if(ui->pushButton_stop->text() == "暂停")
        { 
            ui->pushButton_stop->setText("继续");
            args<<"-STOP"<<"madplay";
        }
        else
        { 
            ui->pushButton_stop->setText("暂停");
            args<<"-CONT"<<"madplay";
        }
        p->execute(buf,args);
    }
    
    void player::on_pushButton_prev_clicked()                                                                          //上一首
    { 
        int row = ui->listWidget->currentRow();
        if(row == 0)
            row = ui->listWidget->count();
        row--;
        ui->listWidget->setCurrentRow(row);
        p->kill();
        p->waitForFinished();
    
        QString buf = QString("madplay");
        QStringList args;
        Music_path = ui->listWidget->currentItem()->text();
        args<<Music_path<<"&";
        p->start(buf,args);
    }
    
    void player::on_pushButton_next_clicked()                                                                          //下一首
    { 
        int row = ui->listWidget->currentRow();
        if(row == ui->listWidget->count()-1)
            row = 0;
        else
            row++;
        ui->listWidget->setCurrentRow(row);
        p->kill();
        p->waitForFinished();
    
        QString buf = QString("madplay");
        QStringList args;
        Music_path = ui->listWidget->currentItem()->text();
        args<<Music_path<<"&";
        p->start(buf,args);
    }
    
    void player::on_pushButton_clear_clicked()                                                                         //清空列表
    { 
        on_pushButton_close_clicked();
        ui->listWidget->clear();
    }
    
    void player::on_pushButton_delete_clicked()                                                                        //删除音乐
    { 
        if(ui->listWidget->currentItem()->text() == Music_path)
        { 
            on_pushButton_close_clicked();
        }
    
        int row = ui->listWidget->currentRow();
        QListWidgetItem *item = ui->listWidget->takeItem(row);
        if(item)
        { 
            delete item;
            on_pushButton_start_clicked();
        }
    }
    
    void player::on_pushButton_exit_clicked()                                                                          //退出
    { 
        on_pushButton_close_clicked();
        this->close();
    }

[完整代码：https://download.csdn.net/download/weixin\_43793181/20335001][https_download.csdn.net_download_weixin_43793181_20335001]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzc5MzE4MQ_size_16_color_FFFFFF_t_70]: /images/20221120/30319a5c1a6e426784e075f5fe12802e.png
[https_download.csdn.net_download_weixin_43793181_20335001]: https://download.csdn.net/download/weixin_43793181/20335001