二、新建values-en-rUS和values-zh-rCN文件夹，并且在两个文件夹中都新建一个strings.xml文件
三、values、values-en-rUS和values-zh-rCN文件夹中的strings.xml文件内容如下所示：
一、配置AndroidManifest文件
将android:configChanges="locale"添加到AndroidManifest文件中，具体如下代码所示：
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:configChanges="locale"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.BookAdvancedLight">
<activity android:name=".activities.test.I18nTestActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>二、新建values-en-rUS和values-zh-rCN文件夹，并且在两个文件夹中都新建一个strings.xml文件
三、values、values-en-rUS和values-zh-rCN文件夹中的strings.xml文件内容如下所示：
values -- strings.xml：
<resources>
<string name="app_name" translatable="false">BookAdvancedLight</string>
<string name="username">username</string>
<string name="password">password</string>
<string name="login">login</string>
<string name="usernameHint">please input username</string>
<string name="passwordHint">please input password</string>
</resources>values-en-rUS -- strings.xml：
<?xml version="1.0" encoding="utf-8"?>
<resources xmlns:tools="http://schemas.android.com/tools"
tools:ignore="ExtraTranslation">
<string name="username">username</string>
<string name="password">password</string>
<string name="login">login</string>
<string name="usernameHint">please input username</string>
<string name="passwordHint">please input password</string>
</resources>values-zh-rCN -- strings.xml：
<?xml version="1.0" encoding="utf-8"?>
<resources xmlns:tools="http://schemas.android.com/tools"
tools:ignore="ExtraTranslation">
<string name="username" >用户名</string>
<string name="password">密码</string>
<string name="login">登录</string>
<string name="usernameHint">请输入用户名</string>
<string name="passwordHint">请输入密码</string>
</resources>四、创建Activity及其布局文件：
Activity文件：
public class I18nTestActivity extends AppCompatActivity {
private Button login;
private ToggleButton translate;
private TextView txtUsername,txtPassword;
private EditText editUsername,editPassword;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_i18n_test);
InitView();
}
private void InitView() {
login = findViewById(R.id.bt_login);
txtUsername = findViewById(R.id.txt_username);
txtPassword = findViewById(R.id.txt_password);
editUsername = findViewById(R.id.edit_username);
editPassword = findViewById(R.id.edit_password);
translate = findViewById(R.id.toggle_button);
translate.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String sta= getResources().getConfiguration().locale.getLanguage();
translateText(sta);
}
});
}
public void translateText(String sta){
if (sta.equals("zh")){
Resources resources = this.getResources();// 获得res资源对象
Configuration config = resources.getConfiguration();// 获得设置对象
DisplayMetrics dm = resources.getDisplayMetrics();// 获得屏幕参数：主要是分辨率，像素等。
config.locale = Locale.US; // 英文
resources.updateConfiguration(config, dm);
this.recreate();
}else {
//转换为中文
Resources resources = this.getResources();// 获得res资源对象
Configuration config = resources.getConfiguration();// 获得设置对象
DisplayMetrics dm = resources.getDisplayMetrics();// 获得屏幕参数：主要是分辨率，像素等。
config.locale = Locale.SIMPLIFIED_CHINESE; // 英文
resources.updateConfiguration(config, dm);
this.recreate();
}
}
}activity.xml 文件：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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=".activities.test.I18nTestActivity"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="80dp"
android:orientation="horizontal">
<TextView
android:id="@+id/txt_username"
android:text="@string/username"
android:gravity="center"
android:layout_width="60dp"
android:layout_height="70dp"
/>
<EditText
android:id="@+id/edit_username"
android:layout_width="match_parent"
android:layout_height="70dp"
android:hint="@string/usernameHint"
/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="80dp"
android:orientation="horizontal">
<TextView
android:id="@+id/txt_password"
android:text="@string/password"
android:gravity="center"
android:layout_width="60dp"
android:layout_height="70dp"
/>
<EditText
android:id="@+id/edit_password"
android:layout_width="match_parent"
android:layout_height="70dp"
android:hint="@string/passwordHint"
/>
</LinearLayout>
<Button
android:id="@+id/bt_login"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/login"/>
<ToggleButton
android:layout_gravity="center"
android:layout_marginTop="10dp"
android:id="@+id/toggle_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textOn="中文"
android:textOff="English"
android:textAllCaps="false"/>
</LinearLayout>