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 ;

	@Override
	protected 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);
	
	}// /onCreate

	private String intToIp(int i) {

		return (i & 0xFF) + "." + ((i >> 8) & 0xFF) + "." + ((i >> 16) & 0xFF)
				+ "." + (i >> 24 & 0xFF);
	}
	/*
	 System.out.println(convertToBinary(1828759744));
	1101101000000001010100011000000
	11000000 & 0xFF   = 192
	i >> 8:0000000011011010000000010101000
	010101000 & 0xFF = 168
	i >> 16:0000000000000000110110100000000
	00000000  & 0xFF   = 0
	i >> 24:0000000000000000000000001101101
	01101101 & 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