一.Android多语言切换
Android应用的开发不可能仅仅针对某一个国家或者区域使用，各国间语言文化各不同样，因此一个优秀的APP必须支持多种语言，为了实现这个特性，Android给出了一个解决方案，在res文件夹下通过values+语言编码来实现多国语言的支持（中间採用连字符号-连接）。比如：values-es代表英文，假设你决定了你的应用要支持多国语言。那么你就必须新建多种values-XXX的多语言支持文件，以下通过一个样例来看看主要的使用方式，先看下效果图：
1.project结构
注：主要看下res/values-en/strings.xml代表英文字符串资源文件，res/values-zh/strings.xml代表中文.
- res/values-en/strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">SwitchLanguage</string>
<string name="hello_world">This is an instance of Android</string>
<string name="switch_language">Switch Language</string>
<string name="english">English</string>
<string name="chinese">Chinese</string>
<string name="jump">Jump to Next Activity</string>
<string name="change">The language of the page has changed, too.</string>
<string name="showtext">You cannot improve your past, but you can improve your future. Once time is wasted, life is wasted.</string>
</resources>
- res/values-zh/strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">切换语言</string>
<string name="hello_world">这是一个Android实例</string>
<string name="switch_language">切换语言</string>
<string name="english">英语</string>
<string name="chinese">中文</string>
<string name="jump">跳转到还有一个页面</string>
<string name="change">这个页面语言也发生了变化</string>
<string name="showtext">你不能改变你的过去。但你能够让你的未来变得更美好。一旦时间浪费了，生命就浪费了。</string>
</resources>2.代码实现
- BaseActivity.java
public class BaseActivity extends Activity
{
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
// 初始化PreferenceUtil
PreferenceUtil.init(this);
// 依据上次的语言设置，又一次设置语言
switchLanguage(PreferenceUtil.getString("language", "zh"));
}
/**
*
* <切换语言>
*
* @param language
* @see [类、类#方法、类#成员]
*/
protected void switchLanguage(String language)
{
// 设置应用语言类型
Resources resources = getResources();
Configuration config = resources.getConfiguration();
DisplayMetrics dm = resources.getDisplayMetrics();
if (language.equals("en"))
{
config.locale = Locale.ENGLISH;
}
else
{
// 中文简体
config.locale = Locale.SIMPLIFIED_CHINESE;
}
resources.updateConfiguration(config, dm);
// 保存设置语言的类型
PreferenceUtil.commitString("language", language);
}
}2、 MainActivity.java
public class MainActivity extends BaseActivity implements OnClickListener{
private Dialog mDialog;
private TextView textShow;
private Button button;
private Button button2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView textView = (TextView) findViewById(R.id.text);
button = (Button) findViewById(R.id.btn);
button2 = (Button) findViewById(R.id.btn_2);
textShow = (TextView)findViewById(R.id.text_show);
textView.setText(R.string.hello_world);
button.setText(R.string.switch_language);
//监听切换语言按钮,弹出dialog选择语言
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (mDialog == null) {
LayoutInflater inflater = getLayoutInflater();
View layout = inflater.inflate(R.layout.dialog_select_lanuage,null);
TextView english = (TextView) layout.findViewById(R.id.select_english);
TextView chinese = (TextView) layout.findViewById(R.id.select_chinese);
mDialog = new Dialog(MainActivity.this, R.style.Custom_Dialog_Theme);
mDialog.setCanceledOnTouchOutside(false);
english.setOnClickListener(MainActivity.this);
chinese.setOnClickListener(MainActivity.this);
mDialog.setContentView(layout);
}
mDialog.show();
}
});
button2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent it = new Intent(MainActivity.this, SecondActivity.class);
startActivity(it);
}
});
}
@Override
public void onClick(View v) {
mDialog.dismiss();
switch (v.getId()) {
case R.id.select_english:
//切换为英文
switchLanguage("en");
break;
case R.id.select_chinese:
//切换为中文
switchLanguage("zh");
break;
default:
break;
}
//更新语言后。destroy当前页面，又一次绘制
finish();
Intent it = new Intent(MainActivity.this, MainActivity.class);
startActivity(it);
}
}- 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: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" >
<TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:text="@string/hello_world" />
<Button
android:id="@+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/text"
android:layout_centerHorizontal="true"
android:layout_marginTop="15dp"
android:text="@string/switch_language" />
<Button
android:id="@+id/btn_2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/btn"
android:layout_centerHorizontal="true"
android:layout_marginTop="15dp"
android:text="@string/jump" />
<TextView
android:id="@+id/text_show"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerInParent="true"
android:textSize="18sp"
android:text="@string/showtext" />
</RelativeLayout>3、 工具类PreferenceUtil.java
public class PreferenceUtil {
private static SharedPreferences mSharedPreferences = null;
private static Editor mEditor = null;
public static void init(Context context){
if (null == mSharedPreferences) {
mSharedPreferences = android.preference.PreferenceManager.getDefaultSharedPreferences(context) ;
}
}
public static void removeKey(String key){
mEditor = mSharedPreferences.edit();
mEditor.remove(key);
mEditor.commit();
}
public static void removeAll(){
mEditor = mSharedPreferences.edit();
mEditor.clear();
mEditor.commit();
}
public static void commitString(String key, String value){
mEditor = mSharedPreferences.edit();
mEditor.putString(key, value);
mEditor.commit();
}
public static String getString(String key, String faillValue){
return mSharedPreferences.getString(key, faillValue);
}
public static void commitInt(String key, int value){
mEditor = mSharedPreferences.edit();
mEditor.putInt(key, value);
mEditor.commit();
}
public static int getInt(String key, int failValue){
return mSharedPreferences.getInt(key, failValue);
}
public static void commitLong(String key, long value){
mEditor = mSharedPreferences.edit();
mEditor.putLong(key, value);
mEditor.commit();
}
public static long getLong(String key, long failValue) {
return mSharedPreferences.getLong(key, failValue);
}
public static void commitBoolean(String key, boolean value){
mEditor = mSharedPreferences.edit();
mEditor.putBoolean(key, value);
mEditor.commit();
}
public static Boolean getBoolean(String key, boolean failValue){
return mSharedPreferences.getBoolean(key, failValue);
}
}
4、 SecondActivity.java是要跳转的Activity，比較简单，仅仅有一个TextView用来显示文本，语言切换。文本语言也随之切换。
public class SecondActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
}
}
- activity_second.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: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" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:text="@string/change" />
</RelativeLayout>样例比較简单，关键代码都有凝视，有问题欢迎留言讨论，共同学习。