如何使用多语言支持书法奥利奥 [英] How to use Calligraphy with multi-language support Oreo

问题描述

我正在开发一个需要支持多种语言的应用程序，如果语言是RTL，我必须应用自定义字体。对于我创建了我的类的要求，扩展了应用程序。一切都很完美，直到我有 Oreo 版本设备（在我启用Marshmellow设备之前）。在奥利奥，如果我们想要更改语言，我们必须创建一个自定义 ContextWrapper 类，这里有问题。

I'm developing an app that need to support multiple languages and if the language is RTL I have to apply a custom font. For the requirement I have created my Class that extends Application. Everything was perfect till I got Oreo version device (Before I have Marshmellow enabled device). In Oreo if we want to change the language we have to create a custom ContextWrapper class, here problem come in.

1. 要使用书法我们需要覆盖 attachBaseContext
   方法。


2. 要更改语言，我们需要覆盖 attachBaseContext

1. To use Calligraphy we need to Override the attachBaseContext method. And
2. To change language we need to Override the attachBaseContext too

我试图在 Overrided中调用 super.attachBaseContext 方法两次一次用于书法，其他用于语言代码，如下所示。

I tried to call super.attachBaseContext in the Overrided method twice One for the Calligraphy and Other for the Language code like below.

@Override
protected void attachBaseContext(Context newBase) {

    // create or get your new Locale object here.
    String lang = Preferences
            .getSharedPreferenceString(appContext, LANGUAGE_KEY, "ar");

    Context context = MyContextWrapper.wrap(newBase, lang);
    super.attachBaseContext(context);
    super.attachBaseContext(CalligraphyContextWrapper.wrap(newBase));
}

它给出了IllegalStateException，因为我们可以附加一次基本上下文。

It give IllegalStateException as we can attach base context once.

• 如果我使用 super.attachBaseContext（context）; 语言更改有效但书法没有。


• 如果我使用 super.attachBaseContext（CalligraphyContextWrapper.wrap（newBase））; 书法有效但语言没有改变。

• If I use super.attachBaseContext(context); the language change works But Calligraphy does not.
• If I use super.attachBaseContext(CalligraphyContextWrapper.wrap(newBase)); Calligraphy works But Language change does not.

在这种情况下，我怎样才能完成所有工作（书法+多语言）。我已经查看了很多帖子/教程，但我现在已经坚持了三天。

In such case how can I make all working (Calligraphy + Multi-language). I have viewed many posts/tutorials but I'm stuck in this for three days now.

请帮我完成这个。谢谢

编辑参考

1. CalligraphyContextWrapper.java


2. ContextWrapper 类接受的答案链接。

1. CalligraphyContextWrapper.java
2. ContextWrapper Class Accepted answer in link.

寻找能够使用书法和更改语言功能的自定义字体的解决方案。或者提供一种方法，以便我可以将语言和应用字体更改为整个应用程序。

Looking for a solution to be able to use custom font with Calligraphy and Change Language Functionality. Alternatively provide a way so that I may be able to change Language and Apply Font to the whole app.

注意：解决方案必须兼容使用API​​ 17到最新的27.我正在使用 AppCompat 。

Note: The solution must be compatible with API 17 to the latest 27. I'm using AppCompat.

推荐答案

我为oreo做了

在您的活动中：

@Override
protected void attachBaseContext(Context newBase) {
    super.attachBaseContext(CalligraphyContextWrapper.wrap(SLocaleHelper.onAttach(newBase)));
}

在您的应用程序主类：

@Override
    protected void attachBaseContext(Context base) {
        super.attachBaseContext(SLocaleHelper.onAttach(base, "sv"));
        MultiDex.install(this);
    }

位置助手类别：

package com.......;

import android.annotation.TargetApi;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.os.Build;
import android.preference.PreferenceManager;

import java.util.Locale;

public class SLocaleHelper {

    private static final String SELECTED_LANGUAGE = "Locale.Helper.Selected.Language";

    public static Context onAttach(Context context) {
        String lang = getPersistedData(context, Locale.getDefault().getLanguage());
        return setLocale(context, lang);
    }

    public static Context onAttach(Context context, String defaultLanguage) {
        String lang = getPersistedData(context, defaultLanguage);
        return setLocale(context, lang);
    }

    public static String getLanguage(Context context) {
        return getPersistedData(context, Locale.getDefault().getLanguage());
    }

    public static Context setLocale(Context context, String language) {
        persist(context, language);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            return updateResources(context, language);
        }

        return updateResourcesLegacy(context, language);
    }

    private static String getPersistedData(Context context, String defaultLanguage) {
        SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
        return preferences.getString(SELECTED_LANGUAGE, defaultLanguage);
    }

    private static void persist(Context context, String language) {
        SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
        SharedPreferences.Editor editor = preferences.edit();

        editor.putString(SELECTED_LANGUAGE, language);
        editor.apply();
    }

    @TargetApi(Build.VERSION_CODES.N)
    private static Context updateResources(Context context, String language) {
        Locale locale = new Locale(language);
        Locale.setDefault(locale);

        Configuration configuration = context.getResources().getConfiguration();
        configuration.setLocale(locale);
        configuration.setLayoutDirection(locale);

        return context.createConfigurationContext(configuration);
    }

    @SuppressWarnings("deprecation")
    private static Context updateResourcesLegacy(Context context, String language) {
        Locale locale = new Locale(language);
        Locale.setDefault(locale);

        Resources resources = context.getResources();

        Configuration configuration = resources.getConfiguration();
        configuration.locale = locale;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            configuration.setLayoutDirection(locale);
        }

        resources.updateConfiguration(configuration, resources.getDisplayMetrics());

        return context;
    }
}

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