Android下获取设备唯一标识(UDID, DeviceID...)

http://blog.csdn.net/langresser_king/article/details/9373051

1、正常情况下可以通过((TelephonyManager) s_instance.getSystemService( Context.TELEPHONY_SERVICE )).getDeviceId();  来获取，但是某些平板电脑此函数会返回空

2、通过 Secure.getString(s_instance.getContentResolver(), Secure.ANDROID_ID);   也可以获取到一个id，但是android2.2或者是某些山寨手机使用这个也是有问题的，它会返回一个固定的值 9774d56d682e549c

3、如果前两个都没有获取到udid，那么就在程序启动的时候创建一个随机的uuid，然后保存起来。这个算是兼容方案，当然这样的设备并不会很多。

或者OpenUDID

https://github.com/vieux/OpenUDID

protected static final String PREFS_FILE = "gank_device_id.xml";
    protected static final String PREFS_DEVICE_ID = "gank_device_id";
    protected static String uuid;
    /**
     * 获取唯一标识码
     * @param mContext
     * @return
     */
    public synchronized static String getUDID(Context mContext)
    {
        if( uuid ==null ) {
                if( uuid == null) {
                    final SharedPreferences prefs = mContext.getApplicationContext().getSharedPreferences( PREFS_FILE, Context.MODE_PRIVATE);
                    final String id = prefs.getString(PREFS_DEVICE_ID, null );

                    if (id != null) {
                        // Use the ids previously computed and stored in the prefs file
                        uuid = id;
                    } else {

                        final String androidId = Settings.Secure.getString(mContext.getContentResolver(), Settings.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")).toString();
                            } else {
                                final String deviceId = ((TelephonyManager) mContext.getSystemService( Context.TELEPHONY_SERVICE )).getDeviceId();
                                uuid = deviceId!=null ? UUID.nameUUIDFromBytes(deviceId.getBytes("utf8")).toString() : UUID.randomUUID().toString();
                            }
                        } catch (UnsupportedEncodingException e) {
                            throw new RuntimeException(e);
                        }

                        // Write the value out to the prefs file
                        prefs.edit().putString(PREFS_DEVICE_ID, uuid).commit();
                    }
                }
        }
        return uuid;
    }