package example. Lesson1. Transfer; 

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

The import android. The Manifest; 
import android.content.Context; 
Import android. Content. IntentFilter; 
The import android. Content. PM. PackageManager; 
The import android. Content. Res. Resources; 
The import android. Content. Res. Loader. ResourcesLoader; 
The import android.net.wifi.WifiInfo; 
The import android.net.wifi.WifiManager; 
import android.os.Bundle; 
The import android. OS. The Environment; 
The import android. OS. Stars; 
import android.widget.TextView; 
import android.widget.Toast; 

The import org.apache.commons.net.ftp.FTPClientConfig; 
The import org. Apache. Ftpserver. Ftpserver; 
The import org. Apache. Ftpserver. FtpServerFactory; 
The import org. Apache. Ftpserver. Ftplet. Authority; 
The import org. Apache. Ftpserver. Ftplet. DefaultFtplet; 
The import org. Apache. Ftpserver. Ftplet. FileSystemFactory; 
The import org. Apache. Ftpserver. Ftplet. FileSystemView; 
The import org. Apache. Ftpserver. Ftplet. FtpException; 
The import org. Apache. Ftpserver. Ftplet. FtpReply; 
The import org. Apache. Ftpserver. Ftplet. FtpRequest; 
The import org. Apache. Ftpserver. Ftplet. FtpSession; 
The import org. Apache. Ftpserver. Ftplet. Ftplet; 
The import org. Apache. Ftpserver. Ftplet. FtpletResult; 
The import org. Apache. Ftpserver. Ftplet. User; 
The import org. Apache. Ftpserver. Ftplet. UserManager; 
The import org. Apache. Ftpserver. Listener. ListenerFactory; 
The import org. Apache. Ftpserver. Usermanager. PropertiesUserManagerFactory; 
The import org. Apache. Ftpserver. Usermanager. Impl. BaseUser; 
The import org. Apache. Ftpserver. Usermanager. Impl. WritePermission; 
Import org, apache log4j. Lf5. Util. The Resource; 

Import the Java. IO. FileOutputStream; 
Import the Java. IO. IOException; 
The import java.net.InetAddress; 
The import java.net.NetworkInterface; 
The import java.net.UnknownHostException; 
import java.util.ArrayList; 
import java.util.Collections; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 

Public class MainActivity extends AppCompatActivity {
Private FtpServer mFtpServer=null; 
Private String intToIp (int I) {

Return (I & amp; 0 XFF) + "+" 
((I & gt;> 8) & amp; 0 XFF) + "+" 
((I & gt;> 16) & amp; 0 XFF) + "+" 
(I & gt;> 24 & amp; 0 XFF); 
} 
@ Override 
Protected void onCreate (Bundle savedInstanceState) {
super.onCreate(savedInstanceState); 
setContentView(R.layout.activity_main); 
////to get wifi service 
//WifiManager WifiManager=(WifiManager) getSystemService (Context. WIFI_SERVICE); 
////whether wifi open 
//if (! WifiManager. IsWifiEnabled ()) {
//wifiManager setWifiEnabled (true); 
//} 
.//WifiInfo WifiInfo=wifiManager getConnectionInfo (); 
//int ipAddress.=wifiInfo getIpAddress (); 
//String IP=intToIp (ipAddress); 
//Toast. MakeText (MainActivity. This IP, Toast. LENGTH_SHORT), show (); 
//the new Thread (new Runnable () {
//@ Override 
//public void the run () {
//
//try {
//stars. Prepare (); 
//InetAddress. GetLocalHost (.) getHostAddress (); 
//Toast. MakeText (MainActivity. This InetAddress. GetLocalHost () getHostAddress (), Toast. LENGTH_SHORT), show (); 
Toast. MakeText (MainActivity. This getLocalIpAddress (), Toast. LENGTH_SHORT), show (); 
//stars. The loop (); 
//} the catch (UnknownHostException e) {
//e.p rintStackTrace (); 
//} 
//} 
//}). The start (); 
Try {
StartFtpServer (getLocalIpAddress ()); 
} the catch (IOException e) {
e.printStackTrace(); 
} 
} 
Public String getLocalIpAddress () {
Try {
List Interfaces=Collections. The list (NetworkInterface. GetNetworkInterfaces ()); 
For (NetworkInterface NetworkInterface: interfaces) {
List Addresses=Collections. The list (networkInterface. GetInetAddresses ()); 

For (InetAddress address: addresses) {
if(! Address. IsLoopbackAddress ()) {
String strAddress=address. GetHostAddress (). ToUpperCase (); 
Boolean isIPv4=isIPv4 (strAddress); 
If (isIPv4) return strAddress; 
} 
} 
} 
} the catch (Exception e) {
e.printStackTrace(); 
} 
return null; 
} 

Private Boolean Isipv4 (String ipv4) {
//the string is null or empty string 
If (ipv4==null | | ipv4. The length ()==0) return false. 
//regular segmentation 
String [] parts=ipv4. Split (" \ \ "); 
If (parts length!=4) return false. 
For (String parts: parts) {
Try {
Int n=Integer. ParseInt (part); 
//is beyond the scope of right 
If (n & lt; 0 | | n & gt; 255) return false. 
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