Android 多语言支持

本文内容

  • 字符串本地化原理
  • 环境
  • 创建项目
  • 测试其他语言
  • Android 本地化语言 ISO 编码
  • 参考资料

使用 Android 的人越来越多,每天都在增加。因此,当你想把你的应用成功地全球化时,通常的方法就是使应用程序本地化。

虽然本地化,你可以考虑使用依靠区域和国家适当的文字,音频,货币,数字和图形。但是,本文只涉及本地化的字符串,例如支持多国语言(multiple languages)。Localizing with Resources 说明了,当本地化应用程序时,应该考虑的其他事情。

本文我们创建一个支持 French、Deutsch(German)、Hindi 和 Japanese 语言的 app。

下载 Demo

字符串本地化原理


默认情况下,Android 把英语作为主要语言,并从 res⇒values⇒strings.xml 中加载字符串资源。当你想添加支持其他语言时,你需要创建相应的文件夹(通过追加一个连字符和 ISO 语言代码)。例如,如果你想添加支持法语,你应该创建一个名为“values-fr”的文件夹,并保持 strings.xml 中的所有字符串都翻译成法文。

简单来说,本地化的原理如下:

  • 1. 当用户通过“设置 ⇒ 语言和输入”改变设备语言时,android 操作系统自己会检查应用程序中相应的语言资源。假设用户选择了 French——法语。
  • 2. 如果 app 支持选择的语言,android 会在项目中的“values-(ISO 语言编码)”文件夹内查找字符串资源。对于法语,会从 values-fr/string.xml 中加载。
  • 3. 如果支持的语言 strings.xml 字符串有缺失,android 总是从默认的 values/strings.xml 中加载缺失的字符串。

因此,默认的 stings.xml 文件应包含应用程序使用的所有字符串的值,这是强制性的。否则,app 会强制关闭错误而崩溃。

可以按如下方式:

当你想要 app 支持多语言时,最好采用下面方式定义字符串。总是在 strings.xml  声明字符串。

<string name="note_email">Enter your email address</string>

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

当在布局 XML 文件中引用时,使用 @strings 注解:

<TextView ...   android:text="@string/note_email"  />

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

在后台,可以使用 R.string

emailNote.setText(R.string.note_email);

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

但不能:

Never hard code the string in xml or in java code which make the translation difficult.

<TextView ...   android:text="Enter your email address"  />

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

以及

emailNote.setText("Enter your email address");  

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

下面创建一个项目,演示让android 支持多语言。

环境


  • Windows 2008 R2 64 位
  • Eclipse ADT V22.6.2,Android 4.4.2(API 19)
  • SAMSUNG GT-8618,Android OS 4.1.2

创建项目


Android 多语言支持

图 1 项目结构

  • 1. 在 values 文件夹下创建  colors.xml

colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="white">#ffffff</color>
    <color name="bg_gradient_start">#b21331</color>
    <color name="bg_gradient_end">#820d2a</color>
    <color name="bg_button_login">#380813</color>
</resources>

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

  • 2. 在 drawable 文件下创建三个名为 bg_button_rounded.xmlbg_form_rounded.xmlbg_gradient.xml 文件。这些文件与支持多语言无关,只是给出了漂亮的渐变背景和圆角按钮,输入框。

bg_button_rounded.xml

<?xml version="1.0" encoding="utf-8"?>
<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
  
    <!-- view background color -->
    <solid
        android:color="@color/bg_button_login" >
    </solid>
  
    <!-- If you want to add some padding -->
    <padding
        android:left="5dp"
        android:top="5dp"
        android:right="5dp"
        android:bottom="5dp"    >
    </padding>
  
    <!-- Here is the corner radius -->
    <corners
        android:radius="6dp"   >
    </corners>
  
</shape>

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

bg_form_rounded.xml

<?xml version="1.0" encoding="utf-8"?>
<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
  
    <!-- view background color -->
    <solid
        android:color="@color/white" >
    </solid>
  
    <!-- If you want to add some padding -->
    <padding
        android:left="5dp"
        android:top="5dp"
        android:right="5dp"
        android:bottom="5dp"    >
    </padding>
  
    <!-- Here is the corner radius -->
    <corners
        android:radius="6dp"   >
    </corners>
  
</shape>

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

bg_gradient.xml

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >
 
    <gradient
        android:gradientRadius="750"
        android:endColor="@color/bg_gradient_end"
        android:startColor="@color/bg_gradient_start"
        android:type="radial" />
</shape>

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

  • 3. 在 values/strings.xml 添加如下字符串。这是默认英文的字符串。

strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
 
    <string name="app_name">Multi Language App</string>
    <string name="action_settings">Settings</string>
     
    <string name="welcome">Welcome!</string>
    <string name="email">Email Address</string>
    <string name="password">Password</string>
    <string name="login">Login</string>
    <string name="signup">Don\'t have account? Sign Up</string>
 
</resources>

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

  • 4. 在 res 文件夹下创建四个名为 values-devalues-frvalues-hivalues-ja 的文件夹,以及在每个文件夹中创建相应的 strings.xml 文件。创建完成后,大概如下所示:

Android 多语言支持

现在,把字符串翻译成相关的语言,并放到相应的 strings.xml 文件中。

另外,针对我的真机,支持三种语言:中文,英文和韩语,因此,再增加一个韩语。翻译是用 google 翻译的,对不对我也不知道。

values-de/strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
     
    <string name="welcome">Willkommen!</string>
    <string name="email">Email Addresse</string>
    <string name="password">passowrd</string>
    <string name="login">Login</string>
    <string name="signup">müssen nicht angemeldet? Anmeldung</string>
 
</resources>

values-fr/strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
     
    <string name="welcome">accueil</string>
    <string name="email">adresse e-mail</string>
    <string name="password">mot de passe</string>
    <string name="login">connexion</string>
    <string name="signup">Ne pas avoir un compte? signer</string>
 
</resources>

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

values-hi/strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
     
    <string name="welcome">स्वागतम</string>
    <string name="email">ईमेल पता</string>
    <string name="password">पासवर्ड</string>
    <string name="login">लॉगिन</string>
    <string name="signup">खाता नहीं है? साइन अप करें</string>
 
</resources>

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

values-ja/strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
     
    <string name="welcome">歓迎</string>
    <string name="email">電子メールアドレス</string>
    <string name="password">パスワード</string>
    <string name="login">ログイン</string>
    <string name="signup">アカウントをお持ちでない場合は?サインアップ</string>
 
</resources>

values-ko/strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    
    <string name="welcome">환영</string>
    <string name="email">이메일</string>
    <string name="password">암호</string>
    <string name="login">로그인</string>
    <string name="signup">가입</string>
 
</resources>

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

  • 5. 创建布局 activity_main.xml,包含一个 title 和登录框。

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/bg_gradient"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >
 
    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:layout_marginLeft="15dp"
        android:layout_marginRight="15dp"
        android:gravity="center"
        android:orientation="vertical" >
 
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="40dp"
            android:text="@string/welcome"
            android:textColor="@color/white"
            android:textSize="45dp"
            android:textStyle="bold" />
 
        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:background="@drawable/bg_form_rounded"
            android:orientation="vertical" >
 
            <EditText
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="10dp"
                android:background="@null"
                android:hint="@string/email"
                android:padding="5dp"
                android:singleLine="true" />
 
            <EditText
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:background="@null"
                android:hint="@string/password"
                android:inputType="textPassword"
                android:padding="5dp" />
        </LinearLayout>
 
        <Button
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="25dp"
            android:background="@drawable/bg_button_rounded"
            android:text="@string/login"
            android:textColor="@color/white" />
    </LinearLayout>
 
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="25dp"
        android:gravity="center_horizontal"
        android:text="@string/signup"
        android:textColor="@color/white" />
 
</RelativeLayout>

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

  • 6. 创建 MainActivity.java。

MainActivity.java

public class MainActivity extends Activity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        getActionBar().hide();
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
 
}

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

Android 多语言支持

图 2 Android 多语言——英文

测试其他语言


按下面步骤测试一下app对其他语言的支持:

1. 在设备上进入“设置 ⇒ 语言和输入”

2. 选择你设备支持的语言。

Android 多语言支持

图 3 SAMSUNG GT-8618 语言和输入

Android 多语言支持

图 4 Android 多语言——韩语

Android 本地化语言 ISO 编码


下表给出 Android 支持的 ISO 语言编码。

表 1 Android 支持的 ISO 语言编码

Language   

Locale   

values/strings.xml

German        de values-de/strings.xml
Chinese     zh   values-zh/strings.xml
Czech        cs values-cs/strings.xml
Dutch        nl values-nl/strings.xml
French        fr values-fr/strings.xml
Italian        it values-it/strings.xml
Japanese        ja values-ja/strings.xml
Korean        ko values-ko/strings.xml
Polish       pl values-pl/strings.xml
Russian        ru values-ru/strings.xml
Spanish        es values-es/strings.xml
Arabic        ar values-ar/strings.xml
Bulgarian        bg values-bg/strings.xml
Catalan       ca values-ca/strings.xml
Croatian        hr values-hr/strings.xml
Danish        da values-da/strings.xml
Finnish        fi values-fi/strings.xml
Greek        el values-el/strings.xml
Hebrew        iw values-iw/strings.xml
Hindi        hi values-hi/strings.xml
Hungarian        hu values-hu/strings.xml
Indonesian       in values-in/strings.xml
Latvian        lv values-lv/strings.xml
Lithuanian       lt values-lt/strings.xml
Norwegian        nb values-nb/strings.xml
Portuguese        pt values-pt/strings.xml
Romanian        ro values-ro/strings.xml
Serbian        sr values-sr/strings.xml
Slovak        sk values-sk/strings.xml
Slovenian        sl values-sl/strings.xml
Swedish        sv values-sv/strings.xml
Tagalog        tl values-tl/strings.xml
Thai        th values-th/strings.xml
Turkish        tr values-tr/strings.xml
Ukrainian        uk values-uk/strings.xml
Vietnamese        vi values-vi/strings.xml

参考资料


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