System theme at start

app/src/main/java/ru/vtosters/lite/utils/Globals.java

@@ -239,4 +239,13 @@ public class Globals {
         resources.updateConfiguration(configuration, resources.getDisplayMetrics());
         return context;
     }
+
+    public static float[] getCenterScreenCoords() {
+        int width = getResources().getDisplayMetrics().widthPixels;
+        int height = getResources().getDisplayMetrics().heightPixels;
+
+        int centerWidth = width/2;
+        int centerHeight = height/2;
+        return new float[] {centerWidth, centerHeight};
+    }
 }

app/src/main/java/ru/vtosters/lite/utils/Preferences.java

@@ -9,6 +9,7 @@ import static ru.vtosters.lite.utils.Globals.registerActivities;
 import static ru.vtosters.lite.utils.Newsfeed.setupFilters;
 import static ru.vtosters.lite.utils.OpusLoader.LoadLibrary;
 import static ru.vtosters.lite.utils.Proxy.setProxy;
+import static ru.vtosters.lite.utils.Themes.systemThemeChanger;
 
 import android.app.Application;
 import android.content.Context;
@@ -35,8 +36,10 @@ public class Preferences {
         reloadMessagesList();
         registerActivities(application);
         LoadLibrary("vkopustest");
+        systemThemeChanger();
     }
 
+
     public static boolean BooleanFalse(String key) {
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getContext());
         return prefs.getBoolean(key, false);
@@ -51,6 +54,10 @@ public class Preferences {
         return BooleanTrue("opusmodule");
     }
 
+    public static boolean systemtheme() {
+        return BooleanTrue("systemtheme");
+    }
+
     public static boolean authorsrecomm() {
         return BooleanTrue("authorsrecomm");
     }

app/src/main/java/ru/vtosters/lite/utils/Themes.java

@@ -5,10 +5,12 @@ import static ru.vtosters.lite.utils.Globals.getPreferences;
 import static ru.vtosters.lite.utils.Preferences.color_grishka;
 import static ru.vtosters.lite.utils.Preferences.isBGStickersEnabled;
 import static ru.vtosters.lite.utils.Preferences.navbar;
+import static ru.vtosters.lite.utils.Preferences.systemtheme;
 import static ru.vtosters.lite.utils.Preferences.vksans;
 
 import android.content.Context;
 import android.content.res.ColorStateList;
+import android.content.res.Configuration;
 import android.graphics.drawable.Drawable;
 import android.os.Build;
 import android.support.v7.widget.Toolbar;
@@ -19,6 +21,7 @@ import com.vk.core.d.RecoloredDrawable;
 import com.vk.core.ui.themes.VKTheme;
 import com.vk.core.ui.themes.VKThemeHelper;
 import com.vk.im.ui.themes.ImTheme;
+import com.vk.im.ui.themes.ImThemeHelper;
 import com.vtosters.lite.R;
 
 public class Themes {
@@ -194,4 +197,26 @@ public class Themes {
         }
         return "images";
     }
+
+    public static void systemThemeChanger() {
+        if (!systemtheme())
+            return;
+        int currentNightMode = getContext().getResources().getConfiguration().uiMode & Configuration.UI_MODE_NIGHT_MASK;
+        switch (currentNightMode) {
+            case Configuration.UI_MODE_NIGHT_UNDEFINED:
+                changeTheme(getLightTheme(), getImLightTheme());
+                break;
+            case Configuration.UI_MODE_NIGHT_NO:
+                changeTheme(getLightTheme(), getImLightTheme());
+                break;
+            case Configuration.UI_MODE_NIGHT_YES:
+                changeTheme(getDarkTheme(), getImDarkTheme());
+                break;
+        }
+    }
+
+    public static void changeTheme(VKTheme theme, ImTheme imtheme) {
+            VKThemeHelper.b.a(theme);
+            ImThemeHelper.b.a(imtheme);
+    }
 }