QT功能十分强大，最重要的是跨平台移植性非常好，由于本人是学嵌入式的，所以做图形界面比较喜欢用QT，最近学习QT当做练习做了一个迷你版的音乐播放器，主要实现音乐播放、暂停、切换、音量大小调节，快进、添加和删除歌曲等基本功能，同时背景可以根据歌曲切换而切换，有歌词显示的功能，设计主界面主要如下：
整个QT项目下再放置三个文件夹，分别存放图片，歌词和歌曲文件。
images文件夹如下，有按钮图片，播放器的logo和歌曲的背景图片。
lrc文件夹如下，存放歌词文件，在网易云音乐和酷狗上获取歌词和歌曲的图片都很容易。
歌曲文件格式如下，当然这里将下载下来的歌词文件按照自己的格式改动了一下，大家可以按照自己的方式选择歌词的格式。
music文件夹如下，存放所有歌曲文件：
工程结构目录比较简单：
musicwidget.h代码如下：
#ifndef MUSICWIDGET_H
#define MUSICWIDGET_H
#include <QWidget>
#include <QListWidget>
#include <QMediaPlayer>
#include <QTime>
#include <QMouseEvent>
#include <QKeyEvent>
#include <QFont>
#include <QTextStream>
#include <QString>
#include <QListWidgetItem>
#include <QColor>
#define MUSICLIST_MAXLEN 200
#define MUSICLRC_MAXLEN 500
namespace Ui {
class MusicWidget;
}
class MusicWidget : public QWidget
{
Q_OBJECT
public:
explicit MusicWidget(QWidget *parent = 0);
~MusicWidget();
void musicPositionChange(qint64 position);
void setWindowBackgroundImage();
void mousePressEvent(QMouseEvent *e);
void mouseMoveEvent(QMouseEvent *e);
void mouseReleaseEvent(QMouseEvent *e);
void keyPressEvent(QKeyEvent *e);
private slots:
void on_pb_addMusic_clicked();
void on_lw_listMusic_currentItemChanged(QListWidgetItem *current, QListWidgetItem *previous);
void on_pb_test_clicked();
void on_slider_volume_valueChanged(int value);
void on_slider_musicTime_valueChanged(int value);
void on_pb_startOrPause_clicked();
void on_lw_listMusic_doubleClicked(const QModelIndex &index);
void on_pb_lastMusic_clicked();
void on_pb_nextMusic_clicked();
void on_pb_voice_clicked();
void on_pb_close_clicked();
void on_pb_minWindow_clicked();
void on_lw_listMusic_entered(const QModelIndex &index);
void on_lw_listMusic_pressed(const QModelIndex &index);
void on_lw_listMusic_itemEntered(QListWidgetItem *item);
void on_pb_delMusic_clicked();
private:
Ui::MusicWidget *ui;
QString musicList[MUSICLIST_MAXLEN];
QString musicLrc[MUSICLRC_MAXLEN];
QString currentMusicName;
int musicListCounter;
int musicLrcLineCounter;
int lrcAddLineCounter;
int musicVolume_last;
int musicVolume_now;
QPoint startRelativePos;
QMediaPlayer player;
int playFlag;
bool musicPositionChangeFlag;
bool musicStartFlag;
bool voiceOpenFlag;
};
#endif // MUSICWIDGET_H
musicwidget.c代码如下：
#include "musicwidget.h"
#include "ui_musicwidget.h"
#include <QFileDialog>
#include <QFileInfo>
#include <QDebug>
MusicWidget::MusicWidget(QWidget *parent) :
QWidget(parent),
ui(new Ui::MusicWidget)
{
ui->setupUi(this);
setFixedSize(this->width(), this->height());
musicListCounter = 0; //初始化音乐列表为空
musicLrcLineCounter = 0; //初始化歌词列表为空
musicVolume_now = musicVolume_last = 30; //音量为30
playFlag = 0;
musicPositionChangeFlag = false;
musicStartFlag = false;
voiceOpenFlag = true; //初始时声音是开的
player.setVolume(30);
ui->slider_volume->setValue(30);
ui->pb_startOrPause->setIcon(QIcon("images/bfzn_004.png" ));
ui->pb_startOrPause->setFixedSize(40, 40);
ui->pb_voice->setIcon(QIcon("images/voice_open.png" ));
ui->pb_voice->setFixedSize(16, 16);
ui->pb_test->hide();
//ui->pb_close->setStyleSheet("color:red"); //设置按钮的字体颜色为红色
connect(&player, &QMediaPlayer::positionChanged, this, &MusicWidget::musicPositionChange);
setWindowFlags(Qt::FramelessWindowHint);//无边框
//setAttribute(Qt::WA_TranslucentBackground);//背景透明
//设置窗体背景
//QPixmap pixmap = QPixmap("F:/QTProject/MusicBox/images/岑宁儿 - 追光者.png").scaled(this->size());
QPixmap pixmap = QPixmap("images/start.png").scaled(this->size());
QPalette palette (this->palette());
palette.setBrush(QPalette::Background, QBrush(pixmap));
this-> setPalette( palette );
//设置歌曲列表控件的透明度
this->ui->lw_listMusic->setStyleSheet(QString("color:rgba(255,255,255,255);background-color:rgba(10,10,10,150)"));
//设置歌词列表控件的透明度
this->ui->lw_Lyric->setStyleSheet(QString("color:rgba(255,255,255,255);background-color:rgba(10,10,10,200)"));
}
MusicWidget::~MusicWidget()
{
delete ui;
}
//鼠标按下
void MusicWidget::mousePressEvent(QMouseEvent *e)
{
if(e->buttons() == Qt::LeftButton)
startRelativePos = e->pos();
}
//鼠标移动
void MusicWidget::mouseMoveEvent(QMouseEvent *e)
{
if(startRelativePos.y() < 40 && startRelativePos.x() < 700) //只有在窗口上部分才能拖动窗口
if (e->buttons() & Qt::LeftButton)
move(e->globalPos() - startRelativePos);
}
//鼠标松开
void MusicWidget::mouseReleaseEvent(QMouseEvent *e)
{
e->accept();
}
void MusicWidget::musicPositionChange(qint64 position)
{
qDebug() << "musicPositionChange" ;
if(player.state() == QMediaPlayer::PlayingState)
{
playFlag++;
if(playFlag >= 2)
{
qDebug() << "musicPositionChange->PlayingState" << QString::number(player.position()*100/player.duration());
ui->slider_musicTime->setValue(player.position()*100/player.duration());
musicPositionChangeFlag = true; //表明是该函数修改触发的事件
QTime duration(0, player.position() / 60000, qRound((player.position() % 60000) / 1000.0), 0);
ui->lb_musicTime->setText(duration.toString(tr("mm:ss")));
QTime duration2(0, player.duration() / 60000, qRound((player.duration() % 60000) / 1000.0), 0);
ui->lb_musicTime->setText(ui->lb_musicTime->text() + "/" + duration2.toString(tr("mm:ss")));
//如果歌曲播放完毕
if(duration == duration2)
{
qDebug() << "Music Success" << "Next music->" << musicList[(ui->lw_listMusic->currentIndex().row() + 1) % musicListCounter];
//当前歌曲播放完了，自动切换下一首歌曲
player.setMedia(QUrl::fromLocalFile(musicList[(ui->lw_listMusic->currentIndex().row() + 1) % musicListCounter]));
ui->lw_listMusic->setCurrentRow((ui->lw_listMusic->currentIndex().row() + 1) % musicListCounter);
player.play();
currentMusicName = ui->lw_listMusic->currentItem()->text();
setWindowBackgroundImage();
}
if(musicLrc[0].compare(currentMusicName) != 0) //如果当前歌曲的歌词不在记录中，则重新载入相应的歌词
{
QFile lrcFile("lrc/" + ui->lw_listMusic->currentItem()->text() + ".txt");
ui->lw_Lyric->clear();
if(lrcFile.open(QIODevice::ReadOnly)) //打开文件成功
{
QTextStream lrcFileStream(&lrcFile);
lrcFileStream.setCodec("UTF-8");
musicLrcLineCounter = 0;
musicLrc[musicLrcLineCounter++] = currentMusicName;
while (!lrcFileStream.atEnd()) //按行把所有歌词读入到数组中
{
QString line = lrcFile.readLine();
musicLrc[musicLrcLineCounter++] = line;
}
lrcFile.close();
}
else //找不到该歌曲的歌词文件
{
int currentMusicRow=0;
ui->lw_Lyric->clear();
lrcAddLineCounter = 0;
for(int i=currentMusicRow-4; i<currentMusicRow+5; i++)
{
if(i == currentMusicRow)
{
ui->lw_Lyric->addItem("当前歌曲无歌词");
}
else
{
ui->lw_Lyric->addItem("");
}
lrcAddLineCounter++;
ui->lw_Lyric->setCurrentRow(lrcAddLineCounter-1);
ui->lw_Lyric->currentItem()->setTextAlignment(Qt::AlignCenter);
if(i == currentMusicRow)
{
QFont font;
font.setPointSize(18);
ui->lw_Lyric->setCurrentRow(4);
ui->lw_Lyric->currentItem()->setFont(font);
ui->lw_Lyric->currentItem()->setTextAlignment(Qt::AlignCenter);
ui->lw_Lyric->currentItem()->setTextColor(Qt::darkGreen);
//ui->lw_Lyric->currentItem()->setBackgroundColor(QColor(255,255,255,150));
}
}
}
}
else //显示歌词
{
int currentMusicRow=0;
for(currentMusicRow=0; currentMusicRow < musicLrcLineCounter; currentMusicRow++) //在歌词数组中找到当前时间点的那一行歌词
{
QString mm,ss;
mm = musicLrc[currentMusicRow].mid(1, 2);
ss = musicLrc[currentMusicRow].mid(4, 2);
QTime duration3(0, mm.toInt(), ss.toInt(), 0);
if(duration3 == duration) //如果找到与当前时间对应的歌词
{
break;
}
}
if(currentMusicRow < musicLrcLineCounter) //如果找到了对应歌词
{
ui->lw_Lyric->clear();
lrcAddLineCounter = 0;
for(int i=currentMusicRow-4; i<currentMusicRow+5; i++)
{
if(i >= 0 && i < musicLrcLineCounter)
{
QStringList lrc = musicLrc[i].split("]");
if(lrc.count() == 2)
ui->lw_Lyric->addItem(lrc.at(1));
else
ui->lw_Lyric->addItem(musicLrc[i]);
//ui->lw_Lyric->addItem(musicLrc[i]);
lrcAddLineCounter++;
ui->lw_Lyric->setCurrentRow(lrcAddLineCounter-1);
ui->lw_Lyric->currentItem()->setTextAlignment(Qt::AlignCenter);
}
else
{
ui->lw_Lyric->addItem("");
lrcAddLineCounter++;
ui->lw_Lyric->setCurrentRow(lrcAddLineCounter-1);
ui->lw_Lyric->currentItem()->setTextAlignment(Qt::AlignCenter);
}
if(i == currentMusicRow)
{
QFont font;
font.setPointSize(18);
ui->lw_Lyric->setCurrentRow(4);
ui->lw_Lyric->currentItem()->setFont(font);
ui->lw_Lyric->currentItem()->setTextAlignment(Qt::AlignCenter);
ui->lw_Lyric->currentItem()->setTextColor(Qt::darkGreen);
//ui->lw_Lyric->currentItem()->setBackgroundColor(QColor(255,255,255,150));
}
}
}
}
ui->lw_Lyric->setCurrentRow(-1); //取消歌词列表的选中状态
}
}
else
{
playFlag = 0;
}
}
void MusicWidget::on_pb_addMusic_clicked()
{
bool hasSameItem = false;
//QStringList path = QFileDialog::getOpenFileNames(this, "选择音乐文件", "E:\\CloudMusic");
QStringList path = QFileDialog::getOpenFileNames(this, "选择音乐文件", "./music");
for(int i=0; i<path.count(); i++) //逐条添加歌曲到歌曲列表中
{
hasSameItem = false;
for(int j=0; j<musicListCounter; j++) //寻找是否有相同的地址的歌曲
{
if(musicList[j].compare(path.at(i)) == 0)
{
hasSameItem = true;
break;
}
}
if(hasSameItem == false) //歌曲不重复则可以被添加进来
{
musicList[musicListCounter++] = path.at(i); //把选取的每条信息加入记录列表
QFileInfo info(path.at(i));
ui->lw_listMusic->addItem(info.baseName()); //将路径转化为文件名
}
}
}
void MusicWidget::on_pb_delMusic_clicked()
{
for(int i = ui->lw_listMusic->currentIndex().row(); i < musicListCounter-1; i++)
{
musicList[i] = musicList[i+1];
}
musicListCounter--;
ui->lw_listMusic->takeItem(ui->lw_listMusic->currentIndex().row());
qDebug() << "current:" << QString::number(ui->lw_listMusic->currentIndex().row());
}
void MusicWidget::on_lw_listMusic_currentItemChanged(QListWidgetItem *current, QListWidgetItem *previous)
{
qDebug() << "current:" << current->text() << QString::number(ui->lw_listMusic->currentIndex().row());
}
void MusicWidget::setWindowBackgroundImage()
{
//设置窗体背景
QPixmap pixmap = QPixmap("images/" + ui->lw_listMusic->currentItem()->text() + ".png"); //加载背景图片
if(pixmap.isNull() == false) //能找到当前歌曲的背景图片
{
pixmap = pixmap.scaled(this->width(), this->height()); //调整图片大小拉伸自动适应窗口
QPalette palette (this->palette());
palette.setBrush(QPalette::Background, QBrush(pixmap));
this-> setPalette( palette );
}
else //不能找到当前歌曲的背景图片，设置一个默认的背景图片
{
QPixmap pixmap = QPixmap("images/start.png"); //加载背景图片
pixmap = pixmap.scaled(this->width(), this->height()); //调整图片大小拉伸自动适应窗口
QPalette palette (this->palette());
palette.setBrush(QPalette::Background, QBrush(pixmap));
this-> setPalette( palette );
}
}
void MusicWidget::on_pb_test_clicked()
{
/*
ui->lb_musicTime->setText(QString::number( player.duration()));
qDebug() << "duration:" << QString::number( player.duration()) << ", position:" << QString::number( player.position());
ui->slider_musicTime->setValue(player.position()/player.duration());
QTime duration(0, player.position() / 60000, qRound((player.position() % 60000) / 1000.0), 0);
ui->lb_musicTime->setText(duration.toString(tr("mm:ss")));
*/
QFont font;
font.setPixelSize(25);
ui->lw_listMusic->currentItem()->setFont(font);
//ui->lw_listMusic->setStyleSheet("background-color:blue;");
QFile lrcFile("lrc/岑宁儿 - 追光者.txt");
if(!lrcFile.open(QIODevice::ReadOnly)) //打开文件失败
{
return;
}
QTextStream lrcFileStream(&lrcFile);
lrcFileStream.setCodec("UTF-8");
while (!lrcFileStream.atEnd())
{
QString line = lrcFile.readLine();
line = line + "\n";
}
lrcFile.close();
}
void MusicWidget::on_slider_volume_valueChanged(int value)
{
qDebug() << QString::number(ui->slider_volume->value()) << "," << QString::number(value);
player.setVolume(value);
if(musicVolume_now != value)
{
musicVolume_last = musicVolume_now;
musicVolume_now = value;
}
if(value == 0)
{
if(voiceOpenFlag == true)
{
ui->pb_voice->setIcon(QIcon("images/voice_close.png" ));
}
voiceOpenFlag = false;
}
else
{
if(voiceOpenFlag == false)
{
ui->pb_voice->setIcon(QIcon("images/voice_open.png" ));
}
voiceOpenFlag = true;
}
ui->lb_volume->setText(QString::number(value) + "%");
}
void MusicWidget::on_slider_musicTime_valueChanged(int value)
{
if(musicPositionChangeFlag == false)
{
if(musicStartFlag == true)
{
player.pause();
player.setPosition(value*player.duration()/100);
player.play();
currentMusicName = ui->lw_listMusic->currentItem()->text();
}
else
{
player.setPosition(value*player.duration()/100);
}
}
else
{
musicPositionChangeFlag = false;
}
}
void MusicWidget::on_pb_startOrPause_clicked()
{
if(!musicStartFlag)
{
ui->pb_startOrPause->setIcon(QIcon("images/bfzn_003.png" ));
//ui->pb_startOrPause->setFixedSize(40, 40);
musicStartFlag = true;
//player.play();
if(player.state() == QMediaPlayer::StoppedState)
{
player.setMedia(QUrl::fromLocalFile(musicList[ui->lw_listMusic->currentIndex().row()]));
setWindowBackgroundImage();
}
//if(player.state() != QMediaPlayer::PlayingState)
player.play();
currentMusicName = ui->lw_listMusic->currentItem()->text();
}
else
{
ui->pb_startOrPause->setIcon(QIcon("images/bfzn_004.png" ));
musicStartFlag = false;
player.pause();
}
}
void MusicWidget::on_lw_listMusic_doubleClicked(const QModelIndex &index)
{
player.setMedia(QUrl::fromLocalFile(musicList[ui->lw_listMusic->currentIndex().row()]));
player.play();
currentMusicName = ui->lw_listMusic->currentItem()->text();
musicStartFlag = true;
ui->pb_startOrPause->setIcon(QIcon("images/bfzn_003.png" ));
setWindowBackgroundImage();
}
void MusicWidget::on_pb_lastMusic_clicked()
{
//切换上一首歌曲
if(ui->lw_listMusic->currentIndex().row() - 1 >= 0)
{
player.setMedia(QUrl::fromLocalFile(musicList[(ui->lw_listMusic->currentIndex().row() - 1) % musicListCounter]));
ui->lw_listMusic->setCurrentRow((ui->lw_listMusic->currentIndex().row() - 1) % musicListCounter);
}
else
{
player.setMedia(QUrl::fromLocalFile(musicList[musicListCounter - 1]));
ui->lw_listMusic->setCurrentRow(musicListCounter - 1);
}
player.play();
currentMusicName = ui->lw_listMusic->currentItem()->text();
if(musicStartFlag == false)
{
musicStartFlag = true;
ui->pb_startOrPause->setIcon(QIcon("images/bfzn_003.png" ));
}
setWindowBackgroundImage();
}
void MusicWidget::on_pb_nextMusic_clicked()
{
//切换下一首歌曲
player.setMedia(QUrl::fromLocalFile(musicList[(ui->lw_listMusic->currentIndex().row() + 1) % musicListCounter]));
ui->lw_listMusic->setCurrentRow((ui->lw_listMusic->currentIndex().row() + 1) % musicListCounter);
player.play();
currentMusicName = ui->lw_listMusic->currentItem()->text();
if(musicStartFlag == false)
{
musicStartFlag = true;
ui->pb_startOrPause->setIcon(QIcon("images/bfzn_003.png" ));
}
setWindowBackgroundImage();
}
void MusicWidget::on_pb_voice_clicked()
{
if(voiceOpenFlag == false)
{
ui->pb_voice->setIcon(QIcon("images/voice_open.png" ));
ui->slider_volume->setValue(musicVolume_last);
voiceOpenFlag = true;
}
else
{
ui->slider_volume->setValue(0);
//on_slider_volume_valueChanged(0);
ui->pb_voice->setIcon(QIcon("images/voice_close.png" ));
voiceOpenFlag = false;
}
}
void MusicWidget::on_pb_close_clicked()
{
this->close(); //关闭窗体
}
void MusicWidget::on_pb_minWindow_clicked()
{
this->showMinimized(); //最小化窗体
}
void MusicWidget::keyPressEvent(QKeyEvent *e)
{
qDebug() << "keyPressEvent" << QString::number(e->key());
if(e->key()==Qt::Key_Enter || e->key()==Qt::Key_Return) //如果在音乐列表按下回车键
{
qDebug() << "Key_Enter";
if(ui->lw_listMusic->hasFocus()) //如果当前焦点在音乐列表上
{
player.setMedia(QUrl::fromLocalFile(musicList[ui->lw_listMusic->currentIndex().row()]));
setWindowBackgroundImage();
player.play();
currentMusicName = ui->lw_listMusic->currentItem()->text();
musicStartFlag = true;
}
}
}
void MusicWidget::on_lw_listMusic_entered(const QModelIndex &index)
{
qDebug() << "enter";
}
void MusicWidget::on_lw_listMusic_pressed(const QModelIndex &index)
{
qDebug() << "press";
}
void MusicWidget::on_lw_listMusic_itemEntered(QListWidgetItem *item)
{
qDebug() << "itemEntered";
}
总体运行结果如下：
代码下载链接：https://download.csdn.net/download/qq_34254642/10917513
2019年12月19日：
最近有一些朋友给我发消息说不能播放音乐或者是工程编译报错，我也经常逛CSDN查找资料，明白那种充满期待下载了别人的资源然后又用不了的心情，真的是一种非常糟糕的体验，针对以上问题的解决办法。
（1）工程不能编译：工程是QT5.6版本的，因为工程保留的编译配置是我本人电脑的配置，大家需要根据自己的实际情况改下配置。
（2）工程编译成功，界面也出来了，但是播放不了音乐或者报错提示如下：
DirectShowPlayerService::doRender: Unresolved error code 80040266
原因是Qt 中的多媒体播放，底层是使用DirectShowPlayerService，所以安装一个DirectShow解码器，例如LAV Filters，就可以解决运行出错问题，这里我帮大家找到了下载地址http://files.1f0.de/lavf/LAVFilters-0.65.exe，下载安装就OK了，参考了下面这位朋友的博客https://blog.csdn.net/mmmmmmyy/article/details/81877233在此表示感谢。
（3）因为之前写这个播放器的时候刚学QT，代码水平也不是很高，所以会有一些BUG，有兴趣的大家可以继续改进，就当做一个参考就行了。
（4）知道大家在CSDN上下载资源要花C币，要么就是到某宝上代下，我下载资源的时候也想过如果作者给百度云或者gittub的链接该多好啊，所以，己所不欲勿施于人。上传个百度云的链接链接：https://pan.baidu.com/s/1R_7ZJX73Y4lHnxBzxNlqLg
提取码：7ncx
