这篇文章主要介绍“Qt如何实现MP3音乐播放器”,在日常操作中,相信很多人在Qt如何实现MP3音乐播放器问题上存在疑惑,小编查阅了各式资料,整理出简单好用的操作方法,希望对大家解答”Qt如何实现MP3音乐播放器”的疑惑有所帮助!接下来,请跟着小编一起来学习吧!
音乐播放器逻辑
首先通过打开文件,获取文件夹下mp3文件的名字,将其存入QTableWidget控件下,通过双击QTableWidget空间中的内容,播放相应的mp3音乐文件,同时通过使用QMediaPlaylist来实现上一首,下一首的功能。
效果图
具体实现
widget.h
#ifndef WIDGET_H#define WIDGET_H #include <QWidget>class QMediaPlayer;class QMediaPlaylist; class QLabel; namespace Ui {class Widget;} class Widget : public QWidget{ Q_OBJECT public: explicit Widget(QWidget *parent = nullptr); void InitWidget(); ~Widget(); private slots: void on_pushButton_clicked(); void on_pushButton_5_clicked(); void musicplayer(int,int); void on_pushButton_7_clicked(); void on_pushButton_8_clicked(); void on_pushButton_6_clicked(bool checked); void valueChanged(qint64 value); void setPositon(int); void updateDuration(qint64 duration); protected: private: void findFile(const QString&path,std::vector<QString>& fileNames); Ui::Widget *ui; QString path; QMediaPlayer *player; QMediaPlaylist *playlist; int num_music; int status = 1; qint64 position;}; #endif // WIDGET_H
widget.cpp
#include "widget.h"#include "ui_widget.h"#include<QFileDialog>#include<QDebug>#include<QMediaPlayer>#include<QTableWidgetItem>#include<QMouseEvent>#include<QMediaPlaylist> Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget){ player = new QMediaPlayer(this); playlist = new QMediaPlaylist; ui->setupUi(this); InitWidget(); connect(ui->tableWidget,&QTableWidget::cellDoubleClicked,this,&Widget::musicplayer); connect(ui->horizontalSlider,&QSlider::sliderMoved,this,&Widget::setPositon); connect(player, &QMediaPlayer::durationChanged, this, &Widget::updateDuration); connect(player,&QMediaPlayer::positionChanged,this,&Widget::valueChanged); } void Widget::InitWidget(){ ui->label_2->hide(); ui->label_3->hide(); ui->tableWidget->hide(); ui->pushButton_5->hide(); ui->pushButton_6->hide(); ui->pushButton_7->hide(); ui->pushButton_8->hide(); ui->horizontalSlider->hide(); ui->label_4->hide();} Widget::~Widget(){ delete ui;} void Widget::on_pushButton_clicked(){ ui->label_2->show(); ui->tableWidget->show(); ui->pushButton_5->show();} void Widget::on_pushButton_5_clicked(){ path = QFileDialog::getExistingDirectory(this,"请选择本地音乐文件夹"); std::vector<QString> fileNames; findFile(path,fileNames); //设置行数,列数 ui->tableWidget->setColumnCount(1); ui->tableWidget->setRowCount(fileNames.size()); num_music = fileNames.size(); for(int i=0;i<fileNames.size();i++) { ui->tableWidget->setItem(i,0,new QTableWidgetItem(fileNames[i])); //设置cell不可编辑 QTableWidgetItem* pItem = ui->tableWidget->item(i, 0); int editflag = Qt::ItemIsEditable; pItem->setFlags((Qt::ItemFlag)(~editflag & pItem->flags())); }} static QString formatTime(qint64 timeMilliSeconds){ qint64 seconds = timeMilliSeconds / 1000; const qint64 minutes = seconds / 60; seconds -= minutes * 60; return QStringLiteral("%1:%2") .arg(minutes, 2, 10, QLatin1Char('0')) .arg(seconds, 2, 10, QLatin1Char('0'));} void Widget::musicplayer(int row, int column){ QTableWidgetItem *item = new QTableWidgetItem; playlist->clear(); player->pause(); item = ui->tableWidget->item(row,0);// player->setMedia(QUrl::fromLocalFile(item->text())); for(int i=row;i<num_music;i++) { item = ui->tableWidget->item(i,0); playlist->addMedia(QUrl::fromLocalFile(item->text())); } playlist->setCurrentIndex(0); playlist->setPlaybackMode(QMediaPlaylist::Loop); player->setPlaylist(playlist); player->play(); ui->label_3->show(); ui->pushButton_6->show(); ui->pushButton_7->show(); ui->pushButton_8->show(); ui->horizontalSlider->show(); ui->label_4->setText(formatTime(0)); ui->label_4->show();} void Widget::findFile(const QString &path, std::vector<QString> &fileNames){ QDir dir(path); //获取path下所有文件夹和文件 dir.setFilter(QDir::Dirs|QDir::Files|QDir::NoDotAndDotDot); //文件夹/文件/不包含./和../ //排序文件夹优先 dir.setSorting(QDir::DirsFirst); //获取文件夹下所有文件(文件夹+文件) QFileInfoList list = dir.entryInfoList(); if(list.size()==0) { return; } //遍历 for(int i=0;i<list.size();i++) { QFileInfo fileInfo = list.at(i); if(fileInfo.isDir()) { findFile(fileInfo.filePath(),fileNames); } else { if(fileInfo.suffix()=="mp3") { fileNames.emplace_back(list.at(i).filePath()); } } }} void Widget::on_pushButton_7_clicked(){ playlist->next();} void Widget::on_pushButton_8_clicked(){ playlist->previous();} void Widget::on_pushButton_6_clicked(bool checked){ int status1 = status%2; //qDebug()<<checked; if(status1==0) { player->setPosition(position); player->play(); ui->pushButton_6->setIcon(QPixmap("C:/Users/11830/Downloads/4.jpg")); } else { player->pause(); position = player->position(); ui->pushButton_6->setIcon(QPixmap("C:/Users/11830/Downloads/1.jpg")); } status+=1;} void Widget::valueChanged(qint64 value){ ui->horizontalSlider->setValue(value); ui->label_4->setText(formatTime(value)); ui->label_3->setText(player->metaData("Title").toString());} void Widget::setPositon(int value){ if (qAbs(player->position() - value) > 99) player->setPosition(value); //qDebug()<<(value*player->duration()/100);} void Widget::updateDuration(qint64 duration){ ui->horizontalSlider->setRange(0, duration); ui->horizontalSlider->setEnabled(duration > 0); ui->horizontalSlider->setPageStep(duration / 10);}
main.cpp
#include "widget.h"#include <QApplication> int main(int argc, char *argv[]){ QApplication a(argc, argv); Widget w; w.show(); return a.exec();}
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