Android Studio 多國語言切換

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 Android Studio 多國語言切換

設定多國語言

string.xml文字編輯

res -> values -> string.xml
<resources>
       <string name ="app_name" > Multi_Language_switch </string>
       <string name="HelloWorld" > Hello World! </string>
       <string name ="language" > English </string>
       <string name ="NextPage" > Next Page </string>
</resources>

編輯語言

string.xml右鍵 -> Open Translations

點選上方 選擇語言

可以點選框格進行編寫
也可以進入string.xml(語言)進行編寫

之後依此類推

中文string.xml提供參考
<resources>
       <string name ="app_name" > Multi_Language_switch </string>
       <string name ="HelloWorld" > 你好世界! </string>
       <string name ="language" > 中文 </string>
       <string name ="NextPage" > 下一頁 </string>
</resources>

日文string.xml提供參考
<resources>
       <string name ="app_name" > Multi_Language_switch </string>
       <string name ="HelloWorld" > こんにちは世界! </string>
       <string name ="language" > にほんご </string>
       <string name ="NextPage" > 次のページ </string>
</resources>

Layout設計

activity.main

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="150dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />

<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="30dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app :layout_constraintTop_toBottomOf ="@+id/textView" />

<RadioGroup
android :id ="@+id/mRadioGroup"
android :clickable ="true"
android :layout_width ="wrap_content"
android :layout_height ="wrap_content"
android :orientation ="vertical"
android :layout_marginTop ="30dp"
app :layout_constraintEnd_toEndOf ="parent"
app :layout_constraintStart_toStartOf ="parent"
app :layout_constraintTop_toBottomOf ="@+id/button" >

<RadioButton
android :id ="@+id/RadioButton_EN"
android :layout_width ="wrap_content"
android :layout_height ="wrap_content"
android :layout_weight ="2"
android :text ="English" />

<RadioButton
android :id ="@+id/RadioButton_ZH"
android :layout_width ="wrap_content"
android :layout_height ="wrap_content"
android :layout_weight ="2"
android :text =" 中文 " />

<RadioButton
android :id ="@+id/RadioButton_JA"
android :layout_width ="wrap_content"
android :layout_height ="wrap_content"
android :layout_weight ="2"
android :text =" にほんご " />
</RadioGroup>

</androidx.constraintlayout.widget.ConstraintLayout>

activity.main2

新增一個Activity

<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context=".MainActivity2">

 <TextView
 android:id="@+id/languageTXT"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="@string/language"
 android:textSize="40dp"
 app:layout_constraintBottom_toBottomOf="parent"
 app:layout_constraintEnd_toEndOf="parent"
 app:layout_constraintStart_toStartOf="parent"
 app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

Java class

Locale

新增Java class -> LocaleHelper

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

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

        //現行版本 >= Android N
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            return updateResources(context, language);
        }
        return updateResourcesLegacy(context, language);
    }

    private static void persist(Context context, String language) {
        //取得SharedPreference
        SharedPreferences preferences 
                = PreferenceManager.getDefaultSharedPreferences(context);
        //取得Editor
        SharedPreferences.Editor editor = preferences.edit();
        //存放資料，put資料型態(key, value)
        editor.putString(SELECTED_LANGUAGE, language);
        //申請變更
        editor.apply();
    }


    @TargetApi(Build.VERSION_CODES.N)
    private static Context updateResources(Context context, String language) {
        Locale locale = new Locale(language);
        Locale.setDefault(locale);
        //獲取資源當前設置
        Configuration configuration 
                = context.getResources().getConfiguration();
        //設定語言環境
        configuration.setLocale(locale);
        //設定Layout環境
        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;
    }
}

MainActivity

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.content.Intent;
import android.content.res.Resources;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;


public class MainActivity extends AppCompatActivity {

    private RadioGroup mRadioGroup;
    private RadioButton RadioButton_EN,
            RadioButton_ZH,
            RadioButton_JA;
    private TextView textView;
    private Button button;
    Context context;
    public static Resources resources;

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

    private void viewinit()
    {
        textView = (TextView)findViewById(R.id.textView);
        button = (Button) findViewById(R.id.button);
        button.setOnClickListener(next);
        RadioButton_EN = (RadioButton) findViewById(R.id.RadioButton_EN);
        RadioButton_ZH = (RadioButton) findViewById(R.id.RadioButton_ZH);
        RadioButton_JA = (RadioButton) findViewById(R.id.RadioButton_JA);
        mRadioGroup = (RadioGroup) findViewById(R.id.mRadioGroup);
        mRadioGroup.setOnCheckedChangeListener(LC);
        RadioButton_EN.performClick();
    }

    private RadioGroup.OnCheckedChangeListener LC =
            new RadioGroup.OnCheckedChangeListener()
    {
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId)
        {
            switch (checkedId)
            {
                case R.id.RadioButton_EN:
                    context = LocaleHelper.setLocale(MainActivity.this, "en");
                    resources = context.getResources();
                    textView.setText(resources.getString(R.string.HelloWorld));
                    button.setText(resources.getString(R.string.NextPage));
                    break;

                case R.id.RadioButton_ZH:
                    context = LocaleHelper.setLocale(MainActivity.this, "zh");
                    resources = context.getResources();
                    textView.setText(resources.getString(R.string.HelloWorld));
                    button.setText(resources.getString(R.string.NextPage));
                    break;
                case R.id.RadioButton_JA:
                    context = LocaleHelper.setLocale(MainActivity.this, "ja");
                    resources = context.getResources();
                    textView.setText(resources.getString(R.string.HelloWorld));
                    button.setText(resources.getString(R.string.NextPage));
                    break;

            }
        }
    };

    private Button.OnClickListener next = new Button.OnClickListener()
    {
        @Override
        public void onClick(View v)
        {
            Intent intent = new Intent();
            intent.setClass(MainActivity.this,MainActivity2.class);
            startActivity(intent);
        }
    };
}

mRadioGroup.setOnCheckedChangeListener(LC);
RadioButton_EN.performClick();
建立RadioGroup監聽事件，並做RadioButton_EN的自動點擊做初始設定

context = LocaleHelper.setLocale();
resources = context.getResources();
resources讀取在LocaleHelper設定的語言

MainActivity2

import static com.cylemon.multi_language_switch.MainActivity.resources;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.TextView;

public class MainActivity2 extends AppCompatActivity {

    private TextView languageTXT;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        languageTXT = (TextView) findViewById(R.id.languageTXT);
        languageTXT.setText(resources.getString(R.string.language));

    }
}

import MainActivity的resources就能在不同Activity更改語言設定
**記得要修改成自己的路徑**

GitHub

Example提供參考

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