DeviceUuidFactory

安卓设备唯一码工具类

[1].[代码] [Java]代码 跳至 [1]

?

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

importandroid.content.Context;

importandroid.content.SharedPreferences;

importandroid.provider.Settings.Secure;

importandroid.telephony.TelephonyManager;

importjava.io.UnsupportedEncodingException;

importjava.util.UUID;

publicclass DeviceUuidFactory {

    protectedstatic final String PREFS_FILE = "device_id.xml";

    protectedstatic final String PREFS_DEVICE_ID = "device_id";

    protectedstatic UUID uuid;

  

    publicDeviceUuidFactory(Context context) {

        if( uuid ==null) {

            synchronized(DeviceUuidFactory.class) {

                if( uuid == null) {

                    finalSharedPreferences prefs = context.getSharedPreferences( PREFS_FILE, 0);

                    finalString id = prefs.getString(PREFS_DEVICE_ID, null);

                    if(id != null) {

                        // Use the ids previously computed and stored in the prefs file

                        uuid = UUID.fromString(id);

                    }else{

                        finalString androidId = Secure.getString(context.getContentResolver(), Secure.ANDROID_ID);

                        // Use the Android ID unless it's broken, in which case fallback on deviceId,

                        // unless it's not available, then fallback on a random number which we store

                        // to a prefs file

                        try{

                            if(!"9774d56d682e549c".equals(androidId)) {

                                uuid = UUID.nameUUIDFromBytes(androidId.getBytes("utf8"));

                            }else{

                                finalString deviceId = ((TelephonyManager) context.getSystemService( Context.TELEPHONY_SERVICE )).getDeviceId();

                                uuid = deviceId!=null? UUID.nameUUIDFromBytes(deviceId.getBytes("utf8")) : UUID.randomUUID();

                            }

                        }catch(UnsupportedEncodingException e) {

                            thrownew RuntimeException(e);

                        }

                        // Write the value out to the prefs file

                        prefs.edit().putString(PREFS_DEVICE_ID, uuid.toString() ).commit();

                    }

                }

            }

        }

    }

 

    /**

     * Returns a unique UUID for the current android device.  As with all UUIDs, this unique ID is "very highly likely"

     * to be unique across all Android devices.  Much more so than ANDROID_ID is.

     *

     * The UUID is generated by using ANDROID_ID as the base key if appropriate, falling back on

     * TelephonyManager.getDeviceID() if ANDROID_ID is known to be incorrect, and finally falling back

     * on a random UUID that's persisted to SharedPreferences if getDeviceID() does not return a

     * usable value.

     *

     * In some rare circumstances, this ID may change.  In particular, if the device is factory reset a new device ID

     * may be generated.  In addition, if a user upgrades their phone from certain buggy implementations of Android 2.2

     * to a newer, non-buggy version of Android, the device ID may change.  Or, if a user uninstalls your app on

     * a device that has neither a proper Android ID nor a Device ID, this ID may change on reinstallation.

     *

     * Note that if the code falls back on using TelephonyManager.getDeviceId(), the resulting ID will NOT

     * change after a factory reset.  Something to be aware of.

     *

     * Works around a bug in Android 2.2 for many devices when using ANDROID_ID directly.

     *

     * @see http://code.google.com/p/android/issues/detail?id=10603

     *

     * @return a UUID that may be used to uniquely identify your device for most purposes.

     */

    publicUUID getDeviceUuid() {

        returnuuid;

    }

}