Android下获取设备惟一标识(UDID, DeviceID...)

android下获取设备惟一标识本来很是简单（至少不会像iOS同样禁用这个，禁用那个），可是因为设备的多样性须要考虑的东西也对应复杂起来。

先附上完整代码

protected static final String PREFS_FILE = "gank_device_id.xml";  
    protected static final String PREFS_DEVICE_ID = "gank_device_id";
    protected static String uuid;
    static public String getUDID()
    {
    	if( uuid ==null ) {
            synchronized (GankMainActivity.class) {  
                if( uuid == null) {  
                    final SharedPreferences prefs = s_instance.getSharedPreferences( PREFS_FILE, 0);  
                    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 = Secure.getString(s_instance.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")).toString();  
                            } else {  
                                final String deviceId = ((TelephonyManager) s_instance.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;
    }

一、正常状况下能够经过((TelephonyManager) s_instance.getSystemService( Context.TELEPHONY_SERVICE )).getDeviceId();  来获取，可是某些平板电脑此函数会返回空

二、经过 Secure.getString(s_instance.getContentResolver(), Secure.ANDROID_ID);   也能够获取到一个id，可是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

三、若是前两个都没有获取到udid，那么就在程序启动的时候建立一个随机的uuid，而后保存起来。这个算是兼容方案，固然这样的设备并不会不少。