android获取手机IP及&0xFF详解

<span style="background-color: rgb(255, 255, 255); font-family: Arial, Helvetica, sans-serif; font-size: 12px;">亲测可用，只能在连接wifi时获取IP，在连接GPRS时显示0.0.0.0</span>

package com.example.getip_1;import java.net.InetAddress;import java.net.NetworkInterface;import java.net.SocketException;import java.util.Enumeration;import android.app.Activity;import android.content.Context;import android.net.wifi.WifiInfo;import android.net.wifi.WifiManager;import android.os.Bundle;import android.util.Log;import android.view.Menu;import android.view.MenuItem;import android.widget.TextView;public class MainActivity extends Activity {TextView textView1;TextView textView2 ;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);textView1 = (TextView) findViewById(R.id.textView1);textView2 = (TextView) findViewById(R.id.textView2);// 获取wifi服务WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);// 判断wifi是否开启if (!wifiManager.isWifiEnabled()) {wifiManager.setWifiEnabled(true);}WifiInfo wifiInfo = wifiManager.getConnectionInfo();int ipAddress = wifiInfo.getIpAddress();Log.i("ip", String.valueOf(ipAddress));String ip = intToIp(ipAddress);textView2.setText(String.valueOf(ipAddress));textView1.setText(ip);}// /onCreateprivate String intToIp(int i) {return (i & 0xFF) + "." + ((i >> 8) & 0xFF) + "." + ((i >> 16) & 0xFF)+ "." + (i >> 24 & 0xFF);}/* System.out.println(convertToBinary(1828759744));110110100000000101010001100000011000000 & 0xFF   = 192i >> 8:0000000011011010000000010101000010101000 & 0xFF = 168i >> 16:000000000000000011011010000000000000000  & 0xFF   = 0i >> 24:000000000000000000000000110110101101101 & 0xFF   = 109*/}

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.getip_1"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="15"        android:targetSdkVersion="16" />    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" >    </uses-permission>    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" >    </uses-permission>    <uses-permission android:name="android.permission.WAKE_LOCK" >    </uses-permission>    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name=".MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application></manifest>

http://blog.csdn.net/u010002184/article/details/50986173 java,二进制转换为十进制，valueof和parseInt的区别

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