Added multi-language switch

app/src/main/java/com/fatapp/oxygentoolbox/util/MultiLanguageUtils.java

@@ -0,0 +1,71 @@
+package com.fatapp.oxygentoolbox.util;
+
+import android.app.Activity;
+import android.app.Application;
+import android.content.Context;
+import android.content.res.Configuration;
+import android.content.res.Resources;
+import android.os.Build;
+import android.os.Bundle;
+import android.os.LocaleList;
+import android.text.TextUtils;
+import android.util.DisplayMetrics;
+
+import androidx.annotation.RequiresApi;
+import androidx.appcompat.view.ContextThemeWrapper;
+import androidx.core.os.ConfigurationCompat;
+import androidx.core.os.LocaleListCompat;
+
+import com.fatapp.oxygentoolbox.R;
+
+import java.util.Locale;
+
+public class MultiLanguageUtils {
+
+    public static Context attachBaseContext(Context context) {
+        String locale;
+        if (SharedPreferencesUtils.isNull()) {
+            locale = "default";
+        } else {
+            locale = SharedPreferencesUtils.getLocale();
+        }
+        String language;
+        String country;
+        if (!locale.equals("default")) {
+            language = locale.substring(0, locale.indexOf("_"));
+            country = locale.substring(locale.indexOf("_") + 1);
+        } else {
+            language = ResourceUtil.getSystemLocale().get(0).getLanguage();
+            country = ResourceUtil.getSystemLocale().get(0).getCountry();
+        }
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N_MR1) {
+            return createConfigurationContext(context, language, country);
+        } else {
+            return updateConfiguration(context, language, country);
+        }
+    }
+
+    @RequiresApi(api = Build.VERSION_CODES.N_MR1)
+    private static Context createConfigurationContext(Context context, String language, String country) {
+        Resources resources = context.getResources();
+        Configuration configuration = resources.getConfiguration();
+        Locale locale = new Locale(language, country);
+        LocaleList localeList = new LocaleList(locale);
+        configuration.setLocales(localeList);
+        return context.createConfigurationContext(configuration);
+    }
+
+    private static Context updateConfiguration(Context context, String language, String country) {
+        Resources resources = context.getResources();
+        Configuration configuration = resources.getConfiguration();
+        Locale locale = new Locale(language, country);
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            configuration.setLocales(new LocaleList(locale));
+        } else {
+            configuration.locale = locale;
+            DisplayMetrics displayMetrics = resources.getDisplayMetrics();
+            resources.updateConfiguration(configuration, displayMetrics);
+        }
+        return context;
+    }
+}

app/src/main/java/com/fatapp/oxygentoolbox/util/ResourceUtil.java

@@ -3,9 +3,12 @@ package com.fatapp.oxygentoolbox.util;
 import android.annotation.SuppressLint;
 import android.app.Application;
 import android.content.Context;
+import android.content.res.Configuration;
 import android.content.res.Resources;
 import android.graphics.Color;
 import android.graphics.Rect;
+import android.os.Build;
+import android.util.DisplayMetrics;
 import android.view.Window;
 
 import androidx.annotation.AttrRes;
@@ -13,19 +16,20 @@ import androidx.annotation.ColorInt;
 import androidx.annotation.NonNull;
 import androidx.annotation.StyleRes;
 import androidx.appcompat.view.ContextThemeWrapper;
+import androidx.core.os.ConfigurationCompat;
+import androidx.core.os.LocaleListCompat;
 
 import com.google.android.material.color.MaterialColors;
 
+import java.util.Locale;
 import java.util.Objects;
 
 public final class ResourceUtil {
 
     private static Application sApp;
-    private static Resources sRes;
 
     public static void init(Application app) {
         sApp = app;
-        sRes = app.getResources();
     }
 
     public static Application getApplication() {
@@ -33,15 +37,23 @@ public final class ResourceUtil {
     }
 
     public static Resources getResources() {
-        return sRes;
+        return sApp.getResources();
+    }
+
+    public static Configuration getConfiguration() {
+        return sApp.getResources().getConfiguration();
+    }
+
+    public static DisplayMetrics getDisplayMetrics() {
+        return sApp.getResources().getDisplayMetrics();
     }
 
     public static String getString(int resId) {
-        return sRes.getString(resId);
+        return sApp.getResources().getString(resId);
     }
 
     public static int getColor(int resId) {
-        return sRes.getColor(resId);
+        return sApp.getResources().getColor(resId);
     }
 
     @ColorInt
@@ -82,4 +94,19 @@ public final class ResourceUtil {
             return 0;
         }
     }
+
+    public static Locale getAppLocale() {
+        Locale local;
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            local = getConfiguration().getLocales().get(0);
+        } else {
+            local = getConfiguration().locale;
+        }
+        return local;
+    }
+
+    public static LocaleListCompat getSystemLocale() {
+        Configuration configuration = Resources.getSystem().getConfiguration();
+        return ConfigurationCompat.getLocales(configuration);
+    }
 }

app/src/main/java/com/fatapp/oxygentoolbox/util/SharedPreferencesUtils.java

@@ -0,0 +1,22 @@
+package com.fatapp.oxygentoolbox.util;
+
+import android.app.Application;
+import android.content.SharedPreferences;
+
+import androidx.preference.PreferenceManager;
+
+public class SharedPreferencesUtils {
+    private static SharedPreferences preferences;
+
+    public static void init(Application app) {
+        preferences = PreferenceManager.getDefaultSharedPreferences(app);
+    }
+
+    public static String getLocale() {
+        return preferences.getString("app_language", "default");
+    }
+
+    public static boolean isNull() {
+        return preferences == null;
+    }
+}