Created
October 22, 2015 19:28
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Android Device UUID Factory.
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| package apackage; | |
| import android.content.Context; | |
| import android.content.SharedPreferences; | |
| import android.provider.Settings.Secure; | |
| import android.telephony.TelephonyManager; | |
| import java.io.UnsupportedEncodingException; | |
| import java.util.UUID; | |
| public class DeviceUuidFactory | |
| { | |
| protected static final String PREFS_FILE = "device_id.xml"; | |
| protected static final String PREFS_DEVICE_ID = "device_id"; | |
| protected static UUID uuid; | |
| public DeviceUuidFactory(Context context) | |
| { | |
| if (uuid == null) | |
| { | |
| synchronized (DeviceUuidFactory.class) | |
| { | |
| if (uuid == null) | |
| { | |
| final SharedPreferences prefs = context.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 = UUID.fromString(id); | |
| } else | |
| { | |
| final String 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 (androidId != null && (!"9774d56d682e549c".equals(androidId))) | |
| { | |
| uuid = UUID.nameUUIDFromBytes(androidId.getBytes("utf8")); | |
| } else | |
| { | |
| final String deviceId = ((TelephonyManager) context.getApplicationContext().getSystemService(Context.TELEPHONY_SERVICE)).getDeviceId(); | |
| if(deviceId == null) | |
| { | |
| uuid = UUID.randomUUID(); | |
| prefs.edit().putString(PREFS_DEVICE_ID, uuid.toString()).commit(); | |
| }else{ | |
| uuid = deviceId != null ? UUID.nameUUIDFromBytes(deviceId.getBytes("utf8")) : UUID.randomUUID(); | |
| prefs.edit().putString(PREFS_DEVICE_ID, uuid.toString()).commit(); | |
| } | |
| } | |
| } catch (UnsupportedEncodingException e) | |
| { | |
| throw new RuntimeException(e); | |
| } | |
| } | |
| } | |
| } | |
| } | |
| } | |
| /** | |
| * 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. | |
| */ | |
| public UUID getDeviceUuid() | |
| { | |
| return uuid; | |
| } | |
| } |
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