How to detect phone system is dark theme or light theme?

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Here is the code for the detect dark/light theme when we using the application.

public void onConfigurationChanged(@NonNull Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    int mSysThemeConfig = newConfig.uiMode & Configuration.UI_MODE_NIGHT_MASK;
    layout = findViewById(R.id.mainLayout);
    switch (mSysThemeConfig) {
        //Light theme
        case Configuration.UI_MODE_NIGHT_NO:
            layout.setBackgroundResource(R.drawable.lightTheme);
            layout.setLayoutParams(new RelativeLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT));
            break;
        //Dark theme
        case Configuration.UI_MODE_NIGHT_YES:
            layout.setBackgroundResource(R.drawable.darkMode);
            layout.setLayoutParams(new RelativeLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT));
            break;
    }
}

How do I detect the dark/light theme when we start an application?

Answer

I just found it

Maybe this can help you

int nightModeFlags =
getContext().getResources().getConfiguration().uiMode &
Configuration.UI_MODE_NIGHT_MASK;
switch (nightModeFlags) {
case Configuration.UI_MODE_NIGHT_YES:
     doStuff();
     break;

case Configuration.UI_MODE_NIGHT_NO:
     doStuff();
     break;

case Configuration.UI_MODE_NIGHT_UNDEFINED:
     doStuff();
     break;
}

OR you can go in this link

Android – How to detect if night mode is on when using AppCompatDelegate.MODE_NIGHT_AUTO



Source: stackoverflow