原理：

(尽可能实现，同一设备在不刷机不恢复出厂的情况下，每次生成的设备指纹不变；并且尽可能保证两部不同的设备生成的设备指纹不能一样)

1.将imei号+手机硬件信息+androidID拼接成一个字符串(由于个别手机某些时候获取的wifi MAC和蓝牙MAC不一致,故舍去这两项)；

2.再用MD5把以上信息处理成32位的字符串；

代码实现如下：

package com.barry.utils;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

import android.content.Context;

import android.os.Build;

import android.provider.Settings.Secure;

import android.telephony.TelephonyManager;

import android.util.Log;

/**

* 获取设备指纹的工具类

* @author BarryHuang

* @DATE 2015-8-19

*/

public class FingerprintUtil {

private static final String TAG = "FingerprintUtil";

/**

* 生成一个设备指纹(耗时50毫秒以内)：

* 1.IMEI + 设备硬件信息(主要)+ ANDROID_ID + WIFI MAC组合成的字符串

* 2.用MessageDigest将以上字符串处理成32位的16进制字符串

* @param context

* @return 设备指纹

*/

public static String createFingerprint(Context context) {

//long startTime = System.currentTimeMillis();

// 1.IMEI

TelephonyManager TelephonyMgr = (TelephonyManager) context

.getSystemService(Context.TELEPHONY_SERVICE);

final String imei = TelephonyMgr.getDeviceId();

Log.i(TAG,"imei="+imei);

//2.android 设备信息(主要是硬件信息)

final String hardwareInfo = Build.ID + Build.DISPLAY + Build.PRODUCT

+ Build.DEVICE + Build.BOARD + Build.CPU_ABI

+ Build.MANUFACTURER + Build.BRAND + Build.MODEL

+ Build.BOOTLOADER + Build.HARDWARE /* + Build.SERIAL */

+ Build.TYPE + Build.TAGS + Build.FINGERPRINT + Build.HOST

+ Build.USER;

//Build.SERIAL => 需要API 9以上

Log.i(TAG,"hardward info="+hardwareInfo);

/* 3. Android_id 刷机和恢复出厂会变

* A 64-bit number (as a hex string) that is randomly

* generated when the user first sets up the device and should remain

* constant for the lifetime of the user's device. The value may

* change if a factory reset is performed on the device.

*/

final String androidId = Secure.getString(context.getContentResolver(),

Secure.ANDROID_ID);

Log.i(TAG,"android_id="+androidId);

/**

* 4. The WLAN MAC Address string(个别手机刚开机完成后会获取不到，舍去)

*/

/*WifiManager wifiMgr = (WifiManager) context

.getSystemService(Context.WIFI_SERVICE);

final String wifiMAC = wifiMgr.getConnectionInfo().getMacAddress();

Log.i(TAG,"wifi Mac="+wifiMAC);*/

/*

* 5. get the bluetooth MAC Address

* (有部分手机，如三星GT-S5660 2.3.3，当蓝牙关闭时，获取不到蓝牙MAC;

* 所以为了保证 device id 的不变，舍去)

*/

/*BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

String bt_MAC = null;

if (bluetoothAdapter == null) {

Log.e(TAG, "bluetoothAdapter is null");

} else {

bt_MAC = bluetoothAdapter.getAddress();

}

Log.i(TAG,"m_szBTMAC="+bt_MAC);*/

// Combined Device ID

final String deviceId = imei + hardwareInfo + androidId/* + wifiMAC + bt_MAC*/;

Log.i(TAG,"deviceId="+deviceId);

// 创建一个 messageDigest 实例

MessageDigest msgDigest = null;

try {

msgDigest = MessageDigest.getInstance("MD5");

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

}

//用 MessageDigest 将 deviceId 处理成32位的16进制字符串

msgDigest.update(deviceId.getBytes(), 0, deviceId.length());

// get md5 bytes

byte md5ArrayData[] = msgDigest.digest();

// create a hex string

String deviceUniqueId = new String();

for (int i = 0; i < md5ArrayData.length; i++) {

int b = (0xFF & md5ArrayData[i]);

// if it is a single digit, make sure it have 0 in front (proper

// padding)

if (b <= 0xF) deviceUniqueId += "0";

// add number to string

deviceUniqueId += Integer.toHexString(b);

//Log.i(TAG,"deviceUniqueId=" + deviceUniqueId);

} // hex string to uppercase

deviceUniqueId = deviceUniqueId.toUpperCase();

Log.i(TAG,"生成的设备指纹：" + deviceUniqueId);

//Log.i(TAG,TAG, "生成DeviceId 耗时："+(System.currentTimeMillis() - startTime));

return deviceUniqueId;

}

}