revanced-patches/integrations/java/app/revanced/tudortmund/lockscreen/ShowOnLockscreenPatch.java

package app.revanced.tudortmund.lockscreen;

import android.content.Context;
import android.hardware.display.DisplayManager;
import android.os.Build;
import android.view.Display;
import android.view.Window;
import androidx.appcompat.app.AppCompatActivity;

import static android.view.WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD;
import static android.view.WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED;

public class ShowOnLockscreenPatch {
    /**
     * @noinspection deprecation
     */
    public static Window getWindow(AppCompatActivity activity, float brightness) {
        Window window = activity.getWindow();

        if (brightness >= 0) {
            // High brightness set, therefore show on lockscreen.
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) activity.setShowWhenLocked(true);
            else window.addFlags(FLAG_SHOW_WHEN_LOCKED | FLAG_DISMISS_KEYGUARD);
        } else {
            // Ignore brightness reset when the screen is turned off.
            DisplayManager displayManager = (DisplayManager) activity.getSystemService(Context.DISPLAY_SERVICE);

            boolean isScreenOn = false;
            for (Display display : displayManager.getDisplays()) {
                if (display.getState() == Display.STATE_OFF) continue;

                isScreenOn = true;
                break;
            }

            if (isScreenOn) {
                // Hide on lockscreen.
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1) activity.setShowWhenLocked(false);
                else window.clearFlags(FLAG_SHOW_WHEN_LOCKED | FLAG_DISMISS_KEYGUARD);
            }
        }

        return window;
    }

}