Android File Basic operation

1. Traverse files under the specified folder:

    New File ("/test"). Listfiles ();       for 　　　　 "\ n";   LOG.I ("sang","result = ="+Result );    }          

2. Get the file modification time and delete the file:

if(File.exists () &&File.isfile ()) {Long time=file.lastmodified ();//gets the last time the file was modified, which is a timestamp    if(File.delete ()) {LOG.E ("Sang","Delete succeeded"); }Else{LOG.E ("Sang","Delete Failed"); }}

If you do not have permission, you can manually modify the permissions of the file, such as:

"" += runtime.getruntime ();   Try {    catch  (IOException e) {    e.printstacktrace ();}

In addition to the file operation, you need to add these 2 permissions in the Mainfest.xml file

<!--permission to write data to SDcard

<uses-permission android:name= "Android.permission.WRITE_EXTERNAL_STORAGE" ></uses-permission>

<!--permissions to create/delete files in SDcard-

<uses-permission android:name= "Android.permission.MOUNT_UNMOUNT_FILESYSTEMS" ></uses-permission>

Android File Basic operation