用Qt在Android上实现文件浏览器

       前阵子想过用Qt写一个符合android手机操作习惯的文件浏览器，今天动手实现了。

       查看网上关于这方面的例子，真是太少了，基本上都是介绍怎么用java来实现的。不过既然java能实现，那么c++肯定也能够实现。

Eclipse里面用的是ListView这个控件，刚好Qt有个QListView控件，名字相近，所以就选择使用它了。下面这个图是我设计的文件浏览器界面，设定成横版的了。

  


下面是代码部分：

DirectoryViewer.h

#ifndef DirectoryViewer_H

#define DirectoryViewer_H

#include <QDialog>

#include <QFileSystemModel>

namespace Ui {

class DirectoryViewer;

}

class DirectoryViewer : public QDialog

{

Q_OBJECT

public:

explicit DirectoryViewer(QWidget *parent = 0);

~DirectoryViewer();

public slots:

void btn_Choose_Clicked();

void btn_Return_Clicked();

void btn_Open_Clicked();

void Item_DoubleClicked(QModelIndex index);

public:

QString m_ChoosePath;

private:

Ui::DirectoryViewer *ui;

QFileSystemModel *model;

QString m_nCurrentPath;

QDir root_Dir;

QDir current_Dir;

QModelIndex index;

};

#endif // DirectoryViewer_H

DirectoryViewer.cpp

#include "DirectoryViewer.h"

#include "ui_DirectoryViewer.h"

#include <QDesktopWidget>

DirectoryViewer::DirectoryViewer(QWidget *parent) :

QDialog(parent),

ui(new Ui::DirectoryViewer)

{

ui->setupUi(this);

QDesktopWidget * deskTop = QApplication::desktop();

move( (deskTop->width()-this->width())/2,(deskTop->height()-this->height())/2);

model = new QFileSystemModel(this);

model->setFilter(QDir::AllEntries|QDir::NoDotAndDotDot);

root_Dir = QDir::rootPath();

m_nCurrentPath = root_Dir.absolutePath();

ui->listView->setModel(model);

ui->listView->setRootIndex(model->setRootPath(m_nCurrentPath));

ui->listView->show();

ui->lineEdit->setText(m_nCurrentPath);

QObject::connect(ui->btn_Ruturn,SIGNAL(clicked()),this,SLOT(btn_Return_Clicked()));

QObject::connect(ui->btn_Open,SIGNAL(clicked()),this,SLOT(btn_Open_Clicked()));

QObject::connect(ui->btn_Choose,SIGNAL(clicked()),this,SLOT(btn_Choose_Clicked()));

QObject::connect(ui->listView,SIGNAL(doubleClicked(QModelIndex)),this,SLOT(Item_DoubleClicked(QModelIndex)));

}

DirectoryViewer::~DirectoryViewer()

{

delete ui;

}

void DirectoryViewer::btn_Return_Clicked()

{

if(m_nCurrentPath.length()!= 0)

{

current_Dir = QDir(m_nCurrentPath);

current_Dir.cdUp();

m_nCurrentPath = current_Dir.absolutePath();

ui->listView->setRootIndex(model->setRootPath(m_nCurrentPath));

ui->listView->show();

ui->lineEdit->setText(m_nCurrentPath);

}

}

void DirectoryViewer::btn_Open_Clicked()

{

index = ui->listView->currentIndex();

if(m_nCurrentPath == "/")

{

m_nCurrentPath = "";

}

m_nCurrentPath = m_nCurrentPath + "/"+ index.data().toString();

ui->listView->setRootIndex(model->setRootPath(m_nCurrentPath));

ui->listView->show();

ui->lineEdit->setText(m_nCurrentPath);

}

void DirectoryViewer::btn_Choose_Clicked()

{

index = ui->listView->currentIndex();

if(m_nCurrentPath == "/")

{

m_nCurrentPath = "";

}

m_nCurrentPath = m_nCurrentPath + "/"+ index.data().toString();

m_ChoosePath = m_nCurrentPath;

this->close();

}

下面是实现效果图：





        有待改进的地方是，不应该有打开按钮，这样似乎不合适，应该可以在QListView的doubleClicked(QModeIndex)槽函数内实现这些。另外，常见的

安卓应用的文件浏览器，ListView的每个Item都有分割线，那样看起来更加的美观，以后有机会要尝试解决这两个问题，用Qt做出符合手机操作习惯的

文件浏览器。