Qt移动开发-Android上实现本地文件读写.zip

#include "widget.h" #include "ui_widget.h" bool checkPermission_write() { QtAndroid::PermissionResult r = QtAndroid::checkPermission("android.permission.WRITE_EXTERNAL_STORAGE"); if(r == QtAndroid::PermissionResult::Denied) { QtAndroid::requestPermissionsSync( QStringList() << "android.permission.WRITE_EXTERNAL_STORAGE" ); r = QtAndroid::checkPermission("android.permission.WRITE_EXTERNAL_STORAGE"); if(r == QtAndroid::PermissionResult::Denied) { return false; } } return true; } #define ConfigFile "/storage/emulated/0/xl_config/test.txt" Widget::Widget(QWidget *parent) : QWidget(parent) , ui(new Ui::Widget) { ui->setupUi(this); //申请权限 checkPermission_write(); //创建FFMPEG_IMAGE文件夹 QDir *folder = new QDir; bool exist = folder->exists("/storage/emulated/0/xl_config"); if(exist) { Log_Text_Display("缓存目录存在\r\n"); } else { //创建文件夹 bool ok = folder->mkdir("/storage/emulated/0/xl_config"); if(ok) Log_Text_Display("缓存目录创建成功\r\n"); else Log_Text_Display("缓存目录创建失败\r\n"); } } /*日志显示*/ void Widget::Log_Text_Display(QString text) { QPlainTextEdit *plainTextEdit_log=ui->plainTextEdit; //设置光标到文本末尾 plainTextEdit_log->moveCursor(QTextCursor::End, QTextCursor::MoveAnchor); plainTextEdit_log->insertPlainText(text); } //将数据保存到文件 void Widget::SaveDataToFile(QString text) { /*保存数据到文件,方便下次加载*/ QFile filesrc(ConfigFile); filesrc.open(QIODevice::WriteOnly); QDataStream out(&filesrc); out << text; //序列化写字符串 filesrc.flush(); filesrc.close(); } //从文件读取数据 void Widget::ReadDataFile(void) { QString data; //读取配置文件 //判断文件是否存在 if(QFile::exists(ConfigFile)) { QFile filenew(ConfigFile); filenew.open(QIODevice::ReadOnly); QDataStream in(&filenew); // 从文件读取序列化数据 in >> data; //提取写入的数据 ui->plainTextEdit->clear(); Log_Text_Display(data); filenew.close(); } } Widget::~Widget() { delete ui; } void Widget::on_pushButton_clicked() { SaveDataToFile(ui->plainTextEdit->toPlainText()); } void Widget::on_pushButton_2_clicked() { ReadDataFile(); }