Detect the Android device theme (is it dark or light)

Question

You can set the theme for your app, but I'm wondering if it's possible to find out which one is used by the device. Currently, my app uses Theme.AppCompat.Light. I'd like to avoid changing the theme.

P.S. I've already tried to set it to Theme.DeviceDefault and access its ID using reflection, but no luck so far.

try {
    setTheme(android.R.style.Theme_DeviceDefault);

    Class<Context> contextClass = Context.class;
    Method getThemeMethod = contextClass.getMethod("getThemeResId");
    getThemeMethod.setAccessible(true);
    Log.d("Test", "" + getThemeMethod.invoke(this)); // Always returns 0

    PackageInfo packageInfo = getPackageManager().getPackageInfo(getPackageName(), PackageManager.GET_META_DATA);
    Log.d("Test", getResources().getResourceEntryName(packageInfo.applicationInfo.theme)); // Returns 'Theme.DeviceDefault'
} catch (Exception e) {
    Log.d("Test", "exception", e);
}

basically theme selected by your IDE.If you want to avoid u can change theme. — Real73, Nov 01 '16 at 09:44
@Doomsknight No, I don't want to use the device default theme. I'd like to tell if this theme is dark or light. — Nikolai, Nov 01 '16 at 09:45
The theme you are using has `.Light` in the name, surely it is light. — IAmGroot, Nov 01 '16 at 10:21
@Doomsknight You got me wrong. I want to know if the OS theme is light or dark. I don't need to change my app theme. — Nikolai, Nov 01 '16 at 10:50
Woops. your last two sentences are confusing as they bear no relevance to the question. I was wondering how the avoid changing theme came in, and thought you were meaning something else. — IAmGroot, Nov 01 '16 at 11:27
@Doomsknight I added this to emphasize I want to keep my app theme unchanged. — Nikolai, Nov 01 '16 at 12:02
@Doomsknight I saw some answers suggesting to replace it with `Theme.DeviceDefault`. Unfortunately, that's not an option for me. — Nikolai, Nov 01 '16 at 12:09

Sahil Doshi · Accepted Answer · 2020-09-30T13:22:30.170

20

int currentNightMode = getContext().getResources().getConfiguration().uiMode & Configuration.UI_MODE_NIGHT_MASK;  
switch (currentNightMode) {
    case Configuration.UI_MODE_NIGHT_NO:
        // Night mode is not active on device
        break;
    case Configuration.UI_MODE_NIGHT_YES:
        // Night mode is active on device
        break;
}

edited Sep 30 '20 at 13:22

answered Dec 04 '19 at 13:27

Sahil Doshi

346
1
3
13

1

I believe he is asking for the theme used by the OS system, not the app itself. – hiddeneyes02 Sep 28 '20 at 14:45
Based on his comments on the question, He wants to know the device theme is light or dark. – Sahil Doshi Sep 29 '20 at 15:17
device or OS system, same thing, but not the app – hiddeneyes02 Sep 29 '20 at 19:39
This will check for the device theme. Sorry for the misinformation in the comment. – Sahil Doshi Sep 30 '20 at 13:23
For the Kotlin solution: https://stackoverflow.com/a/57685102/6411857 – DroidClicketyClacker May 06 '23 at 12:50

Shubham Sharma · Answer 2 · 2016-11-01T10:28:49.200

1

This might help ContextThemeWrapper

edited Nov 01 '16 at 10:28

answered Nov 01 '16 at 09:52

Shubham Sharma

315
2
18

1

Thank you, but I don't want to apply the device theme. I've already seen this suggestion here: http://stackoverflow.com/a/26302184/3185295 – Nikolai Nov 01 '16 at 09:59
So you just want to know which theme is device using currently? – Shubham Sharma Nov 01 '16 at 10:26
2

Yes, that's what I'm looking for. – Nikolai Nov 01 '16 at 10:41
U can use getTheme() method – Shubham Sharma Nov 01 '16 at 11:12
2

getTheme() would return my app theme. But I need to retrieve the device theme. – Nikolai Nov 01 '16 at 11:56

Detect the Android device theme (is it dark or light)

2 Answers2

Linked