SystemInfo.systemMemorySize return weird value on samsung s9+

Unity Engine
,
1

Hi community,
I’m having an issue with this method on Samsung s9+.
I have tested on two of different s9+. And they returned two different value.
The result:
Android Model: Samsung SM-G965U1, Ram 5009 MB
Android Model: Samsung SM-G965F, Ram 1099 MB
Tested on Unity: 5.6.4p4, IL2CPP
Any advice, please.

2

Hi! We’ve tested this on a large number of devices and have come up with code changes that landed in 2018.3, but feel that the risk of a regression is too high to backport, considering that there were only two problematic devices (including the SM-G965F).

However, you could use the following script to get the total and available Memory from the native ActivityManager.getMemoryInfo call:

const uint kMegabyte = 1048576u;

AndroidJavaObject getMemoryInfo()
{
    AndroidJavaClass unityPlayerClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
    AndroidJavaObject currentActivity = unityPlayerClass.GetStatic<AndroidJavaObject>("currentActivity");
    AndroidJavaObject systemService = currentActivity.Call<AndroidJavaObject>("getSystemService", "activity");
    AndroidJavaObject memoryInfo = new AndroidJavaObject("android.app.ActivityManager$MemoryInfo");
    systemService.Call("getMemoryInfo", memoryInfo);

    return memoryInfo;
}

int getAvailMemory()
{
    using (var memInfo = getMemoryInfo())
    {
        return (int)(memInfo.Get<long>("availMem") / kMegabyte);
    }
}

int getTotalMemory()
{
    using (var memInfo = getMemoryInfo())
    {
        return (int)(memInfo.Get<long>("totalMem") / kMegabyte);
    }
}