android下獲取設備唯一標識原本非常簡單(至少不會像iOS一樣禁用這個,禁用那個),但是由於設備的多樣性需要考慮的東西也對應復雜起來。
先附上完整代碼
- 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、正常情況下可以通過((TelephonyManager) s_instance.getSystemService( Context.TELEPHONY_SERVICE )).getDeviceId(); 來獲取,但是某些平板電腦此函數會返回空
2、通過 Secure.getString(s_instance.getContentResolver(), Secure.ANDROID_ID); 也可以獲取到一個id,但是android2.2或者是某些山寨手機使用這個也是有問題的,它會返回一個固定的值 9774d56d682e549c
3、如果前兩個都沒有獲取到udid,那么就在程序啟動的時候創建一個隨機的uuid,然后保存起來。這個算是兼容方案,當然這樣的設備並不會很多。