Android Database Backup restores Development notes of an Android tablet project-scheduled task backup

Source: Internet
Author: User

For details, refer to the Development notes of an Android tablet project-scheduled task backup

Create a class to inherit from asynctask

Public class backuptask extends asynctask <string, void, integer> {Private Static final string command_backup = "backupdatabase"; public static final string command_restore = "restroedatabase"; private context mcontext; public backuptask (context) {This. mcontext = context;} @ override protected integer doinbackground (string... params) {// todo auto-generated method stub
// Obtain the path of the database in use. My path is/dlion/db_dlion.db under the sdcard directory.
// The default path is/data/(package name)/databases /*. DB file dbfile = mcontext. getdatabasepath (environment. getexternalstoragedirectory (). getabsolutepath () + "/dlion/db_dlion.db"); file exportdir = new file (environment. getexternalstoragedirectory (), "dlionbackup"); If (! Exportdir. exists () {exportdir. mkdirs ();} file backup = new file (exportdir, dbfile. getname (); string command = Params [0]; If (command. equals (command_backup) {try {backup. createnewfile (); filecopy (dbfile, backup); Return log. D ("backup", "OK");} catch (exception e) {// todo: handle exception E. printstacktrace (); Return log. D ("backup", "fail") ;}} else if (command. equals (command_restore) {T Ry {filecopy (backup, dbfile); Return log. D ("Restore", "success");} catch (exception e) {// todo: handle exception E. printstacktrace (); Return log. D ("Restore", "fail") ;}} else {return NULL ;}} private void filecopy (File dbfile, file backup) throws ioexception {// todo auto-generated method stub filechannel inchannel = new fileinputstream (dbfile ). getchannel (); filechannel outchannel = new fi Leoutputstream (Backup ). getchannel (); try {inchannel. transferto (0, inchannel. size (), outchannel);} catch (ioexception e) {// todo auto-generated Catch Block E. printstacktrace ();} finally {If (inchannel! = NULL) {inchannel. Close ();} If (outchannel! = NULL) {outchannel. Close ();}}}}

Asynchronously load backup and restoration in mainactivity:

// Data recovery private void datarecover () {// todo auto-generated method stub new backuptask(this).exe cute ("restroedatabase");} // data backup private void databackup () {// todo auto-generated method stub new backuptask(thiscmd.exe cute ("backupdatabase ");}
Large-Scale Price Reduction
  • 59% Max. and 23% Avg.
  • Price Reduction for Core Products
  • Price Reduction in Multiple Regions
undefined. /
Connect with us on Discord
  • Secure, anonymous group chat without disturbance
  • Stay updated on campaigns, new products, and more
  • Support for all your questions
undefined. /
Free Tier
  • Start free from ECS to Big Data
  • Get Started in 3 Simple Steps
  • Try ECS t5 1C1G
undefined. /

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.