package com. Example. A0113_log; 

The import android. App. The Activity; 
The import android. Content. PM. PackageManager; 
The import android. OS. Bundle; 
The import android. Util. Log; 

The import androidx. Appcompat. App. AppCompatActivity; 
The import androidx. Core. App. ActivityCompat; 

import java.io.File; 
Import the Java. Text. SimpleDateFormat; 
import java.util.ArrayList; 
Import the Java. Util. Collections; 
The import java.util.Com parator; 
import java.util.Date; 
Import the Java. Util. List; 

/* * 
* 2020.1.13 demand: screening of files/folders in five days, more than five days of file deletion 
* refer to: https://blog.csdn.net/fujiakai/article/details/54087773 
* https://blog.csdn.net/qq_41201881/article/details/81086535 
*/
Public class MainActivity3 extends AppCompatActivity {
//need to find the document root path 
//private String rootPath="/sdcard/Download"; 
Private String rootPath="/data/logs/"; 
Private String TAG="wangp"; 
Private static final ints REQUEST_EXTERNAL_STORAGE=1; 
Private static String [] PERMISSIONS_STORAGE={
"Android. Permission. READ_EXTERNAL_STORAGE," 
"Android. Permission. WRITE_EXTERNAL_STORAGE"}; 

/* * 
* dynamic permissions apply, android6.0 later read sdcard must apply for the 
* @ param activity 
*/
Public static void verifyStoragePermissions Activity (Activity) {

Try {
//check whether have write permissions 
Int permission=ActivityCompat. CheckSelfPermission (activity, 
"Android. Permission. WRITE_EXTERNAL_STORAGE"); 
If (permission!=PackageManager. PERMISSION_GRANTED) {
//do not have permission to write, to apply for a write permissions, will pop up a dialog 
ActivityCompat. RequestPermissions (activity, PERMISSIONS_STORAGE REQUEST_EXTERNAL_STORAGE); 
} 
} the catch (Exception e) {
e.printStackTrace(); 
} 
} 

@ Override 
Protected void onCreate (Bundle savedInstanceState) {
super.onCreate(savedInstanceState); 
The setContentView (R.l ayout. Activity_main); 
VerifyStoragePermissions (this); 

//1. Get all under/data/logs/folder name and the last modified time 
//testFileDirOrName rootPath (); 
//File tmpFile=new File (rootPath + "the 20-01-14-20-01-14/"); 
.//long modifileTime=tmpFile lastModified (); 
//the Log i. (TAG, "modifiy time:" + modifileTime); 
//2. Delete the last modification time is greater than 5 days of the folder 
Del5Days rootPath (); 
} 

/* * 
* refer to: http://www.voidcn.com/article/p-eeswpcan-bpm.html 
* delete more than five days of file 
* @ param path 
*/
Private void del5Days (String path) {
Long fiveDayTime=5 l * 24 * 60 * 60 * 1000 l l l l;//note that don't write L may lead to negative results 
Long currentTime=System. CurrentTimeMillis (); 
The File dirFile=new File (path); 
{if (dirFile. The exists ()) 
The File files []=dirFile. ListFiles (); 
If (files!=null) {
For (the File fileChildDir: files) {
//output file or folder name 
//System. Out. Print (" "+ fileChildDir getName ()); 
If (fileChildDir isDirectory ()) {
Long lastTime=fileChildDir. LastModified (); 
Long diffenTime=currentTime - lastTime. 
If (diffenTime> FiveDayTime)//is more than five days 
{
The Log i. (TAG, "del=====& gt;" + + fileChildDir path. The getName ()); 
Try {
String tmpPath=path + fileChildDir. GetName () + "/"; 
DelFiles (tmpPath); 
FileChildDir. Delete (); 
The Log i. (TAG, "delete success!" ); 
} the catch (Exception e) {
e.printStackTrace(); 
The Log i. (TAG, "delete the error" + e. oString ()); 
} 
} 
} 
If (fileChildDir isFile ()) {
//System. Out. Println (fileChildDir getName () + ": this is a file name"); 
} 
} 
} 
} else {
System. The out. Println (" do you want to find the file does not exist "); 
return ; 
} 
} 

/* * 
* recursive delete specified path file 
* @ return 
*/
Public void delFiles (String filePath) {
The File File=new File (filePath); 
if(! File. The exists ()) {
return; 
} 
String [] list=file. The list (); 
The File temp=null; 
String path=null; 
For (String item: the list) {
Path=filePath + File. The separator + item; 
Temp=new File (path); 
{if (temp. IsFile ()) 
Temp. The delete (); 
continue; 
} 
{if (temp. IsDirectory ()) 
DelFiles (path); 
The new File (path). The delete (); 
continue; 
} 
} 
} 

/* * 
* 
* @ param srcTime long 
 the primitive data types* @ param format MM - dd yyyy - HH: MM: ss 
* @ return String format output time, failure was to long to output the String 
*/
Public String LongTime2DateFormat (long srcTime, String format) {
Try {
The Date d=new Date (srcTime); 
String time=new SimpleDateFormat (format). The format (d); 
The return time. 
} the catch (Exception e) {
e.printStackTrace(); 
The Log. I (" wan ", "LongTime2DateFormat error:" + e. oString ()); 
Return srcTime + ""; 
} 
} 

/* * 
* 
* access to all files in directory 
* 
* @ param realpath 
* @ param files 
* @ return 
*/
Public static List GetFiles (String realpath List Files) {
The File realFile=new File (realpath); 
If (realFile isDirectory ()) {
The File [] subfiles.=realFile listFiles (); 
For (the File File: subfiles) {
If (the file. The isDirectory ()) {
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