Android reads and writes SD cards

The read and write operations on folders and files in Android are the same as those in Java. However, you must specify the user's permissions to run the commands on Android. Modify the androidmanifest. xml file and add the following Configuration:

     <! --  Permission to write data to sdcard  --> 
 <  Uses-Permission  Android: Name  = "Android. Permission. write_external_storage"   >  </  Uses-Permission  > 
 <! --  Permission to create/delete files in sdcard --> 
 <  Uses-Permission  Android: Name  = "Android. Permission. mount_unmount_filesystems"   >  </  Uses-Permission  > 

After this configuration, you can operate on a real machine like Java.CompositionAnd Folders:

 Public   Class Sdcardhelper {

 Public   Static  Void Deletedirectory (string path ){
File dir = New File (PATH );
 If (Dir. exists ()){
Dir. Delete ();
}
}

 Public   Static   Boolean Createdirectory (string path ){
File dir = New File (PATH );
 If (! Dir. exists ()){
Dir. mkdirs ();
}
 If (Dir. exists ()){
 Return   True ;
} Else {
 Return   False ;
}
}

 Public   Static String getdirectory (string subdir ){
String Path = Android. OS. environment. getexternalstoragedirectory ()
. Getabsolutepath () + file. Separator;
 Return Path + subdir;
}

 Public   Static   Boolean Hassdcard (){
String status = environment. getexternalstoragestate ();
 If (Status. Equals (environment. media_mounted )){
 Return   True ;
} Else {
Return   False ;
}
}

}