android下获取设备唯一标识原本非常简单(至少不会像iOS一样禁用这个,禁用那个),但是由于设备的多样性需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;
- }
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。