java - Android Studio 中的 appLocale 设置

Question

我创建了广播组，用户可以在其中选择他们想要的语言，并将应用程序语言更改为所选语言，但我无法使用这些功能(不知道如何!)

我做了什么？

1. 我已经创建了settingsActivity
2. 我已添加广播组
3. 我编写了 setAppLocale 函数
4. 我已设置 onRadioButtonClicked 来更改语言

代码

settingsActivity.java

package com.xxxxxx.xxxxx;

import android.content.res.Configuration;
import android.content.res.Resources;
import android.os.Build;
import android.os.Bundle;

import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;
import androidx.preference.PreferenceFragmentCompat;

import android.util.DisplayMetrics;
import android.view.View;
import android.widget.RadioButton;

import java.util.Locale;

public class SettingsActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.settings_activity);
        getSupportFragmentManager()
                .beginTransaction()
                .replace(R.id.settings, new SettingsFragment())
                .commit();
        ActionBar actionBar = getSupportActionBar();
        if (actionBar != null) {
            actionBar.setDisplayHomeAsUpEnabled(true);
        }
    }

    public static class SettingsFragment extends PreferenceFragmentCompat {
        @Override
        public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
            setPreferencesFromResource(R.xml.root_preferences, rootKey);
        }
    }


    //locale settings
    public void setAppLocale(String localeCode) {
        Resources res = getResources();
        DisplayMetrics dm = res.getDisplayMetrics();
        Configuration conf = res.getConfiguration();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            conf.setLocale(new Locale(localeCode.toLowerCase()));
        } else {
            conf.locale = new Locale(localeCode.toLowerCase());
        }

        res.updateConfiguration(conf, dm);
    }

    // application language switch
    public void onRadioButtonClicked(View view) {
        // Is the button now checked?
        boolean checked = ((RadioButton) view).isChecked();

        // Check which radio button was clicked
        switch(view.getId()) {
            case R.id.radio_indo:
                if (checked)
                    setAppLocale("id");
                    break;
            case R.id.radio_english:
                if (checked)
                    setAppLocale("en");
                    break;
        }
    }

}

settings_activity.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/settings">


    <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginEnd="4sp"
            android:layout_marginRight="4sp"
            android:weightSum="3"
            android:gravity="center"
            android:orientation="horizontal">

        <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical">

            <RadioGroup
                    android:id="@+id/appLang"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:gravity="center"
                    android:layout_marginTop="35dp"
                    android:layout_marginEnd="35dp"
                    android:layout_marginRight="35dp"
                    android:layout_marginStart="35dp"
                    android:layout_marginLeft="35dp"
                    android:orientation="horizontal">

                <TextView
                        android:id="@+id/applangtext"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_weight="1"
                        android:text="@string/applangtextstring" />

                <RadioButton
                        android:id="@+id/radio_indo"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:onClick="onRadioButtonClicked"
                        android:text="@string/indoLang" />

                <RadioButton
                        android:id="@+id/radio_english"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:onClick="onRadioButtonClicked"
                        android:text="@string/englishLang" />

            </RadioGroup>
        </LinearLayout>

    </LinearLayout>
</RelativeLayout>

问题

我需要在我的 java 文件中发生两件事:

1. 将当前语言广播输入标记为已选择
2. 当用户选择另一个单选按钮时进行更改

The question is how do I connect onRadioButtonClicked to setAppLocale? as well as return current language onCreate in order to show current language selected?

更新

根据下面的答案，这是我的最新更新和我添加的额外文件。 但是我的语言切换不起作用

settingsActivity.java

import android.content.res.Configuration;
import android.content.res.Resources;
import android.os.Build;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.preference.PreferenceFragmentCompat;
import android.util.DisplayMetrics;
import android.view.View;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import java.util.Locale;

public class SettingsActivity extends AppCompatActivity {

    PrefManager prefManager; //added
    RadioButton radio_indo, radio_english; //added
    RadioGroup appLang; //added

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.settings_activity);

        //added
        prefManager = new PrefManager(this);

        radio_indo = findViewById(R.id.radio_indo);
        radio_english = findViewById(R.id.radio_english);
        appLang = findViewById(R.id.appLang);

        if (prefManager.getLanguage().equals("en")) {
            radio_english.setChecked(true);
        } else {
            radio_english.setChecked(true);
        }

        // application language switch (added)
        appLang.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup radioGroup, int checkId) {
                switch (checkId) {
                    case R.id.radio_indo:
                        prefManager.setLanguage("id");
                        // you need to restart or recreate your activity after locale change
                        break;
                    case R.id.radio_english:
                        prefManager.setLanguage("en");
                        // you need to restart or recreate your activity after locale change
                        break;
                }
            }
        });

    }

    public static class SettingsFragment extends PreferenceFragmentCompat {
        @Override
        public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
            setPreferencesFromResource(R.xml.root_preferences, rootKey);
        }
    }


    //locale settings
    public void setAppLocale(String localeCode) {
        Resources res = getResources();
        DisplayMetrics dm = res.getDisplayMetrics();
        Configuration conf = res.getConfiguration();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            conf.setLocale(new Locale(localeCode.toLowerCase()));
        } else {
            conf.locale = new Locale(localeCode.toLowerCase());
        }

        res.updateConfiguration(conf, dm);
    }

     // removed my old function as new function added to onCreate

}

PrefManager.java 添加了类

import android.content.Context;
import android.content.SharedPreferences;

public class PrefManager {
    private SharedPreferences.Editor editor;
    private Context mContext;
    private SharedPreferences prefs;
    private final String LANGUAGE = "language";
    private final String PREF = "user_data";

    public PrefManager(Context mContext) {
        this.mContext = mContext;
    }

    public String getLanguage() {
        this.prefs = this.mContext.getSharedPreferences(PREF, 0);
        return this.prefs.getString(LANGUAGE, "en");
    }

    public void setLanguage(String language) {
        this.editor = this.mContext.getSharedPreferences(PREF, 0).edit();
        this.editor.putString(LANGUAGE, language);
        this.editor.apply();
    }
}

BaseActivity.java 添加了类

import android.content.Context;

import androidx.appcompat.app.AppCompatActivity;
import java.util.Locale;

/**
 * Created by nilesh on 20/3/18.
 */

public class BaseActivity extends AppCompatActivity {

    @Override
    protected void attachBaseContext(Context newBase) {

        Locale newLocale;

        String lang = new PrefManager(newBase).getLanguage();

        if (lang.equals("en")) {
            newLocale = new Locale("en");
        } else {
            newLocale = new Locale(lang);
        }


        Context context = ContextWrapper.wrap(newBase, newLocale);
        super.attachBaseContext(context);
    }
}

settings_activity.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/settings">


    <RadioGroup
            android:id="@+id/appLang"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginStart="35dp"
            android:layout_marginLeft="35dp"
            android:layout_marginTop="90dp"
            android:layout_marginEnd="35dp"
            android:layout_marginRight="35dp"
            android:gravity="center"
            android:orientation="horizontal">

        <TextView
                android:id="@+id/applangtext"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="@string/applangtextstring" />

        <RadioButton
                android:id="@+id/radio_indo"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/indoLang" />

        <RadioButton
                android:id="@+id/radio_english"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/englishLang" />

    </RadioGroup>
</RelativeLayout>

这就是我关于语言切换的全部内容。

PS-1: based on provided solution in answer comments I should have add BaseActivity as extends in all my activites but as all my activities are kotlin not java (except settingsActivity) I was not able to add it.

PS-2: even if not getting translatations is because I couldn't add extends at very least I should be able to see translations in my settingsActivity which is java right?

知道为什么这个开关不起作用吗？

Answer 1

注意

You can download source code from github repo

Mark current language radio input as selected

然后您需要将区域设置更改标志/状态保存在 SharedPreferences

示例代码按照以下步骤操作

Create one class name PrefManager

import android.content.Context;
import android.content.SharedPreferences;

public class PrefManager {
    private SharedPreferences.Editor editor;
    private Context mContext;
    private SharedPreferences prefs;
    private final String LANGUAGE = "language";
    private final String PREF = "user_data";

    public PrefManager(Context mContext) {
        this.mContext = mContext;
    }

    public String getLanguage() {
        this.prefs = this.mContext.getSharedPreferences(PREF, 0);
        return this.prefs.getString(LANGUAGE, "en");
    }

    public void setLanguage(String language) {
        this.editor = this.mContext.getSharedPreferences(PREF, 0).edit();
        this.editor.putString(LANGUAGE, language);
        this.editor.apply();
    }
}

Now add below code/ condition in your settingsActivity.java

public class JavaActivity extends AppCompatActivity {

    PrefManager prefManager;
    RadioButton radio_indo, radio_english;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_java);
        prefManager = new PrefManager(this);
        radio_indo = findViewById(R.id.radio_indo);
        radio_english = findViewById(R.id.radio_english);

        if (prefManager.getLanguage().equals("en")) {
            radio_english.setChecked(true);
        } else {
            radio_english.setChecked(true);
        }
    }

}

Make changes when user select another radio button

• 当用户更改语言时，您需要更新它SharedPreferences
• 区域设置更改后，您需要重新启动或重新创建 Activity

注意:您应该使用 RadioGroup.OnCheckedChangeListener() 而不是 android:onClick="onRadioButtonClicked"

示例代码

public class JavaActivity extends AppCompatActivity {

    PrefManager prefManager;
    RadioButton radio_indo, radio_english;
    RadioGroup appLang;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_java);
        prefManager = new PrefManager(this);

        radio_indo = findViewById(R.id.radio_indo);
        radio_english = findViewById(R.id.radio_english);
        appLang = findViewById(R.id.appLang);

        if (prefManager.getLanguage().equals("en")) {
            radio_english.setChecked(true);
        } else {
            radio_english.setChecked(true);
        }

        appLang.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup radioGroup, int checkId) {
                switch (checkId) {
                    case R.id.radio_indo:
                        prefManager.setLanguage("id");
                        // you need to restart or recreate your activity after locale change
                        break;
                    case R.id.radio_english:
                        prefManager.setLanguage("en");
                        // you need to restart or recreate your activity after locale change
                        break;
                }
            }
        });
    }

}

Please follow this my previous answer to change locale runtime

https://stackoverflow.com/a/52270630/7666442