GoogleFit distinguish data between from different devices

Question

I am using GoogleFit HistoryAPI for get step data from user. It's working well.
However, in my case, I want to distinguish data between from different devices (using same account) because I don't want user using same account for 2 or more devices (it is a game base on step so I don't want user play on 1 device and have achievement on many devices).

I found that Device from DataSource#getDevice, Device#getLocalDevice can help me distinguish data between from different devices. Below is info from official docs:

To get information about the device for a data source, use the DataSource.getDevice method. The device information is useful to distinguish from similar sensors on different devices, show the device information from a sensor to the user, or process data differently depending on the device. For example, you may be interested in reading data specifically from the a sensor on a wearable device but not from the same type of sensor on the phone.

To get a Device instance for the device that is running your activity, use the Device.getLocalDevice static method. This is useful when you want to check if a data source is on the same device that your app is running on.

So,

// My idea is comparing the uid of local device and uid of device in datasource
// if it is same => step come from THIS device
// if not => step come from OTHER device
private void dumpDataSet(DataSet dataSet) {
    for (DataPoint dp : dataSet.getDataPoints()) {
        Log.i(Constant.TAG, "Origin type uid: " + dp.getOriginalDataSource().getDevice().getUid());
        Log.i(Constant.TAG, "Local device uid: " + Device.getLocalDevice(getApplicationContext()).getUid());

        ... 
     }
}

However, the logcat result for datasource from only 1 DEVICE is

Origin type uid: 9ff67c48
Local device uid: f2b01c49ecd9c389
// Only the model, manufacturer is same (but I can not use 2 fields because user can use 2 devices with same model, manufacturer)

You can see that the uid from datasource is different to local device uid, so I can not distinguish data.

Is there any way to distinguish data between from different devices? Any help or suggestion would be great appreciated.

DEMO project

Answer 1

From what I get, I think you a looking ro stable ID for each Device. There are few ways of using ID, on which you can relay.

public static String getSerial() {
    final String serial;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
        serial = Build.getSerial();
    } else { 
        serial = Build.SERIAL;    
    }
    return serial;
}

As another eample, it's common to use IMEI, to relay on Unique ID, from Telephony Manager.

public static String getDeviceImei(Context ctx) {
    TelephonyManager telephonyManager = (TelephonyManager) ctx.getSystemService(Context.TELEPHONY_SERVICE);
    return telephonyManager.getDeviceId();
}

And last, but maybe most correct way, I suggest to use Secure ID. Which provides stable background, of using this value. From the Doc On devices that have multiple users, each user appears as a completely separate device, so the ANDROID_ID value is unique to each user. Settings.Secure#ANDROID_ID

import android.provider.Settings.Secure;

private String android_id = Secure.getString(getContext().getContentResolver(),
                                                        Secure.ANDROID_ID);