Android deletes all files under a folder (folder files, etc)

Source: Internet
Author: User

1. Because you need to delete files, you need the following permissions::
<Uses-permission android: name = "android. permission. WRITE_EXTERNAL_STORAGE"> </uses-permission>
2. Core code Copy codeThe Code is as follows: package com. example. deleteyoumi;
Import java. io. File;
Import android. OS. Bundle;
Import android. OS. Handler;
Import android. OS. Message;
Import android. app. Activity;
Import android. view. Menu;
Import android. view. View;
Import android. view. View. OnClickListener;
Import android. widget. Button;
Import android. widget. Toast;
/*
* @ Author: ZhengHaibo
* Web: http://blog.csdn.net/nuptboyzhb
* Mail: zhb931706659@126.com
* 2013-4-28 Nanjing, njupt, China
*/
Public class DeleteYouMiMainActivity extends Activity implements
OnClickListener {
Private Button deleteButton;
Private final static String youmiPathString = "/mnt/sdcard/Android/data/. youmicache/"; // folder path
@ Override
Protected void onCreate (Bundle savedInstanceState ){
Super. onCreate (savedInstanceState );
SetContentView (R. layout. activity_delete_you_mi_main );
DeleteButton = (Button) findViewById (R. id. delete_youmi );
DeleteButton. setOnClickListener (this );
}
@ Override
Public boolean onCreateOptionsMenu (Menu menu ){
// Inflate the menu; this adds items to the action bar if it is present.
GetMenuInflater (). inflate (R. menu. delete_you_mi_main, menu );
Return true;
}
@ Override
Public void onClick (View v ){
// TODO Auto-generated method stub
Switch (v. getId ()){
Case R. id. delete_youmi:
File file = new File (youmiPathString );
DeleteFile (file );
MHandler. sendEmptyMessage (1 );
Break;
Default:
Break;
}
}
Handler mHandler = new Handler (){
Public void handleMessage (Message msg ){
Switch (msg. what ){
Case 0:
Toast. makeText (getApplicationContext (), "the file or folder does not exist", Toast. LENGTH_LONG). show ();
Break;
Case 1:
Toast. makeText (getApplicationContext (), "deleted successfully! ", Toast. LENGTH_LONG). show ();
Break;
Default:
Break;
}
};
};
/**
* Recursively delete files and folders
*
* @ Param file
* Root directory to be deleted
*/
Public void DeleteFile (File file ){
If (file. exists () = false ){
MHandler. sendEmptyMessage (0 );
Return;
} Else {
If (file. isFile ()){
File. delete ();
Return;
}
If (file. isDirectory ()){
File [] childFile = file. listFiles ();
If (childFile = null | childFile. length = 0 ){
File. delete ();
Return;
}
For (File f: childFile ){
DeleteFile (f );
}
File. delete ();
}
}
}
}

3. Expansion
This document uses deletion as an example. Of course, this method can be used to traverse all files in a folder. For example, search for the hosts file.

Related Article

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.