blocks|key|1145685|text|接口级别8%2B：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1145686|您可以使用Patterns.IP_ADDRESS全局正则表达式。|offset|length|1145687|API级别1-7：|1145688|如果您的目标设备的android版本低于2.2，则可以直接在项目中包含此正则表达式：|1145689|private+static+final+Pattern+IP_ADDRESS
++++=+Pattern.compile(
++++++++"((25[0-5]%7C2[0-4][0-9]%7C[0-1][0-9]{2}%7C[1-9][0-9]%7C[1-9])\\.(25[0-5]%7C2[0-4]"
++++++++%2B+"[0-9]%7C[0-1][0-9]{2}%7C[1-9][0-9]%7C[1-9]%7C0)\\.(25[0-5]%7C2[0-4][0-9]%7C[0-1]"
++++++++%2B+"[0-9]{2}%7C[1-9][0-9]%7C[1-9]%7C0)\\.(25[0-5]%7C2[0-4][0-9]%7C[0-1][0-9]{2}"
++++++++%2B+"%7C[1-9][0-9]%7C[0-9]))");
Matcher+matcher+=+IP_ADDRESS.matcher("127.0.0.1");
if+(matcher.matches())+{
++++//+ip+is+correct
}|code-block|syntax|javascript|1145690|entityMap|0|LINK|mutability|MUTABLE|url|http://d.android.com/reference/android/util/Patterns.html#IP_ADDRESS^0|0|5|J|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@$D|Y|E|Z|1|10]]|A|$]]|$1|F|3|G|5|6|7|11|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|12|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|13|8|@]|9|@]|A|$M|N]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

<h2>API Level 8+:</h2>
<p>You can use the <a href="http://d.android.com/reference/android/util/Patterns.html#IP_ADDRESS" rel="nofollow noreferrer">Patterns.IP_ADDRESS</a> global regex.</p>
<h2>API Level 1-7:</h2>
<p>You may directly include this regex in your project if you target devices with android &lt; 2.2:</p>
<pre><code>private static final Pattern IP_ADDRESS
    = Pattern.compile(
        &quot;((25[0-5]|2[0-4][0-9]|[0-1][0-9]{2}|[1-9][0-9]|[1-9])\\.(25[0-5]|2[0-4]&quot;
        + &quot;[0-9]|[0-1][0-9]{2}|[1-9][0-9]|[1-9]|0)\\.(25[0-5]|2[0-4][0-9]|[0-1]&quot;
        + &quot;[0-9]{2}|[1-9][0-9]|[1-9]|0)\\.(25[0-5]|2[0-4][0-9]|[0-1][0-9]{2}&quot;
        + &quot;|[1-9][0-9]|[0-9]))&quot;);
Matcher matcher = IP_ADDRESS.matcher(&quot;127.0.0.1&quot;);
if (matcher.matches()) {
    // ip is correct
}
</code></pre>


blocks|key|1145726|text|要在输入IP时进行检查，您可能需要使用以下命令：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1145727|private+static+final+Pattern+PARTIAl_IP_ADDRESS+=
++++++++++Pattern.compile("%5E((25[0-5]%7C2[0-4][0-9]%7C[0-1][0-9]{2}%7C[1-9][0-9]%7C[0-9])\\.){0,3}"%2B
+++++++++++++++++++++++++++"((25[0-5]%7C2[0-4][0-9]%7C[0-1][0-9]{2}%7C[1-9][0-9]%7C[0-9])){0,1}$");+

ipEditText.addTextChangedListener(new+TextWatcher()+{+++++++++++++++++++++++
++++@Override+public+void+onTextChanged(CharSequence+s,+int+start,+int+before,+int+count)+{}++++++++++++
++++@Override+public+void+beforeTextChanged(CharSequence+s,int+start,int+count,int+after)+{}++++++++++++

++++private+String+mPreviousText+=+"";++++++++++
++++@Override
++++public+void+afterTextChanged(Editable+s)+{++++++++++
++++++++if(PARTIAl_IP_ADDRESS.matcher(s).matches())+{
++++++++++++mPreviousText+=+s.toString();
++++++++}+else+{
++++++++++++s.replace(0,+s.length(),+mPreviousText);
++++++++}
++++}
});|code-block|syntax|javascript|1145728|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>To check the IP as it's being entered you might want to use this instead:</p>

<pre><code>private static final Pattern PARTIAl_IP_ADDRESS =
          Pattern.compile("^((25[0-5]|2[0-4][0-9]|[0-1][0-9]{2}|[1-9][0-9]|[0-9])\\.){0,3}"+
                           "((25[0-5]|2[0-4][0-9]|[0-1][0-9]{2}|[1-9][0-9]|[0-9])){0,1}$"); 

ipEditText.addTextChangedListener(new TextWatcher() {                       
    @Override public void onTextChanged(CharSequence s, int start, int before, int count) {}            
    @Override public void beforeTextChanged(CharSequence s,int start,int count,int after) {}            

    private String mPreviousText = "";          
    @Override
    public void afterTextChanged(Editable s) {          
        if(PARTIAl_IP_ADDRESS.matcher(s).matches()) {
            mPreviousText = s.toString();
        } else {
            s.replace(0, s.length(), mPreviousText);
        }
    }
});
</code></pre>


blocks|key|931252|text|Patterns.IP_ADDRESS.matcher(url).matches();|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|931253|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>Patterns.IP_ADDRESS.matcher(url).matches();
</code></pre>


blocks|key|931274|text|Kotlin中查找有效IP的解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|931275|import+java.util.regex.*;
+...
+...
++++fun+isValidIPAddress(ip:String):Boolean+{
++++++//+Regex+for+digit+from+0+to+255
++++++val+reg0To255+=+("(\\d{1,2}%7C(0%7C1)\\"+%2B+"d{2}%7C2[0-4]\\d%7C25[0-5])")
++++++//+regex+0+To+255+followed+by+a+dot,+4+times+repeat
++++++//+validation+an+IP+address.
++++++val+regex+=+(reg0To255+%2B+"\\."
+++++++++++++++++++%2B+reg0To255+%2B+"\\."
+++++++++++++++++++%2B+reg0To255+%2B+"\\."
+++++++++++++++++++%2B+reg0To255)
++++++val+p+=+Pattern.compile(regex)
++++++val+m+=+p.matcher(ip)
++++++return+m.matches()
++++}
++++
++++val+inputIP+=+"127.1.1.775"
++++println("Input:+"+%2B+inputIP)
++++println("Output:+"+%2B+isValidIPAddress(inputIP))
++++
+...
+...|code-block|syntax|javascript|931276|输入:+127.1.1.055输出:+true|931277|输入:+127.ip.1.75输出:+false|931278|输入:+127.201.1.775输出:+false|931279|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

<p>The solution in Kotlin to find a Valid IP:</p>
<pre><code>import java.util.regex.*;
 ...
 ...
    fun isValidIPAddress(ip:String):Boolean {
      // Regex for digit from 0 to 255
      val reg0To255 = (&quot;(\\d{1,2}|(0|1)\\&quot; + &quot;d{2}|2[0-4]\\d|25[0-5])&quot;)
      // regex 0 To 255 followed by a dot, 4 times repeat
      // validation an IP address.
      val regex = (reg0To255 + &quot;\\.&quot;
                   + reg0To255 + &quot;\\.&quot;
                   + reg0To255 + &quot;\\.&quot;
                   + reg0To255)
      val p = Pattern.compile(regex)
      val m = p.matcher(ip)
      return m.matches()
    }
    
    val inputIP = &quot;127.1.1.775&quot;
    println(&quot;Input: &quot; + inputIP)
    println(&quot;Output: &quot; + isValidIPAddress(inputIP))
    
 ...
 ...
</code></pre>
<p>Input: 127.1.1.055
Output: true</p>
<p>Input: 127.ip.1.75
Output: false</p>
<p>Input: 127.201.1.775
Output: false</p>


<p>I am using simple socket communication between Android (as the client) and PC (as the server). I am having the user input the IP address into an <code>EditText</code> field and I want to validate the IP address. How do you validate an IP address on Android?</p>


How do you validate an IP address on Android?

服务器

Android

Kotlin

我在Android (作为客户端)和PC (作为服务器)之间使用简单的socket通信。我让用户在EditText字段中输入IP地址，然后我想验证IP地址。如何在Android上验证IP地址？

问如何在Android上验证IP地址？
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