An example of IP2ID program for Android programming _android

This example describes the IP2ID program for Android programming. Share to everyone for your reference. The specific analysis is as follows:

One, Description:

Company a project needs to give a series of network equipment allocation ID number, ID is based on IP, the algorithm is as follows:

ID A total of 3 bytes, high byte: From the machine number: 1-31; the last two bytes are the final two bytes of the IP number. A device with an IP of 192.168.0.240 is 31. The ID number is 31, and the 00,240 is converted to decimal 2031856.

Second, the source code:

Package com.id2ip; 
Import android.app.Activity; 
Import Android.os.Bundle; 
Import android.widget.*; 
Import android.view.*; 
 The public class Id2ip extends activity {/** called the ' when ' is the ' The activity ' is a-created-private TextView text; 
 Private button button; 
 @Override public void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); 
 Setcontentview (R.layout.main); 
 Gets the text box id text = (TextView) Findviewbyid (R.ID.EDITTEXT1); 
 Get button ID buttons = (button) Findviewbyid (R.id.button1); 
  Overload key Listener Method Button.setonclicklistener (new Button.onclicklistener () {@Override public void OnClick (View v) { 
  Get input Box text charsequence str = Text.gettext (); 
   Do {//judge whether the input is valid///if the input digits are not 8 digits, then invalid if (Str.length ()!= 8) {text.settext ("input digits must be 8 bits"); 
   Break 
   }//input character is not a number, then invalid int i = 0; for (i = 0;i < 8;i++) {if (Str.charat (i) < ' 0 ') | | 
   (Str.charat (i) > ' 9 ')) 
   {break; } if (I < 8) {text.settext ("input character must be a number"); 
   Break 
   String str_temp = str.tostring (); 
   Convert to number long num = Long.parselong (str_temp); 
   Ip2id Short slave_num = (short) (num/1000000); 
   num = num% 1000000; 
   Short ip1 = (short) (num/1000); 
   num = num% 1000; 
   Short ip0 = (short) num; 
   Long num_temp = Ip0; 
   Num_temp |= ip1 << 8; 
   Num_temp |= slave_num << 16; 
   Str_temp = long.tostring (num_temp); 
   str = str_temp; 
  Text.settext (str); 
  }while (FALSE); 
 } 
 }); } 
}

Third, Attention:

There are 3 places to note in the program:

① string numbers, you can use the method Long.parselong ();

The ② class used to capture space strings in Android is Charsequence, and the common string class in Java is a string that requires conversion.

1.CharSequence Turn string

Charsequence str;
String str_temp = str.tostring ();

2.String to charsequence this directly equals on it:

str = str_temp;

There are no unsigned, unsigned types in ③java, all types are signed

I hope this article will help you with your Android program.