android横竖屏自由地切换中英文

   今天弄好了一个可以只是在App中自由切换中英文，同时可以横竖屏切换。

1）代码贴上：需要通过在Androidmanifest.xml文件中设置android:configChanges属性来实现这点。在这里声明Activity可以处理的横竖屏配置改变，当横竖屏的配置改变时不会重新启动Activity，而会调用Activity的onConfigurationChanged(Resources.Configuration)方法。在本次使用中，就是当横竖屏切换，配置改变，使得Activity重新加载onConfigurationChanged（），并且在该方法中保持我们所需要切换的语言不变........

1、MainActivity.java

package com.nrs.utils.tools;import java.util.Locale;import com.nrs.utils.LanguageApplication;import android.app.Activity ;import android.app.AlertDialog;import android.content.DialogInterface;import android.content.Intent;import android.content.res.Configuration;import android.os.Bundle ;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;import com.nrs.utils.R ;public class MainActivity extends Activity {static final int  LANGUAGE_SWITCHING_OPTION= 0;private Locale mLocale;private Button mLanguage;privateButton mButton;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mLanguage=(Button)findViewById(R.id.lang); mButton=(Button)findViewById(R.id.bt1);mButton.setOnClickListener(new OnClickListener() {public void onClick(View v) {Intent mIntent=new Intent(MainActivity.this ,LangActivity.class);startActivity(mIntent);}});mLanguage.setOnClickListener(new OnClickListener() {public void onClick(View v) {final String mLanguageSwitvher = getResources().getString(R.string.language_switcher);final String[] mItems = getResources().getStringArray(R.array.item);new AlertDialog.Builder(MainActivity.this).setTitle(mLanguageSwitvher).setItems(mItems, new DialogInterface.OnClickListener() {public void onClick(DialogInterface dialog,int which) {if(which==LANGUAGE_SWITCHING_OPTION){mLocale=Locale.SIMPLIFIED_CHINESE;}else {mLocale=Locale.ENGLISH;}LanguageApplication mLanguageApplication=(LanguageApplication)getApplication();mLanguageApplication.setCurIndex(mLocale);onCreate(null);}}).show();}});}@Overridepublic void onConfigurationChanged(Configuration newConfig) {super.onConfigurationChanged(newConfig);LanguageApplication mLanguageApplication=(LanguageApplication)getApplication();Log.d("isRun", "----onConfigurationChanged");if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) { Toast.makeText(MainActivity.this, "现在是横屏", Toast.LENGTH_SHORT).show(); mLanguageApplication.setCurIndex(mLanguageApplication.getCurIndex());} else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {mLanguageApplication.setCurIndex(mLanguageApplication.getCurIndex());Log.d("isRun", "----当前屏幕切换成竖屏显示");}}}

2、LanguageActivity.java

package com.nrs.utils.tools;import com.nrs.utils.R;import android.app.Activity;import android.os.Bundle;public class LangActivity extends Activity{@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.other);}}

3、另外还需要再弄个类： 这个类的目的是全局保存setCurIndex()方法中传进来的Locale,当我们需要到这个Locale时可通过方法getCurIndex（）。（而中在这里是传进的是需要切换到哪个语言）

</pre><p></p><p><strong>LanguageApplication.java</strong></p><p><strong></strong></p><pre name="code" class="java">package com.nrs.utils ;import java.util.Locale;import android.app.Application ;import android.content.res.Configuration;import android.content.res.Resources;import android.util.DisplayMetrics;public class LanguageApplication extends Application {private Locale mLocale;public Locale getCurIndex() {return mLocale;}public void setCurIndex(Locale locale) {//this.mContext=m;this.mLocale = locale;Configuration config =getResources().getConfiguration();// Get set objectResources resources = getResources();// Get the  resource objectsDisplayMetrics dm = resources.getDisplayMetrics();// For screen parameters: mainly resolution, pixels, and so onconfig.locale = mLocale; // Language localesresources.updateConfiguration(config, dm);}@ Overridepublic void onCreate() {super.onCreate() ;}}

4、清单AndroidManifest.xml代码:  需要注意

    这句  android:configChanges="orientation|screenSize"，要在有需要的activity中添加，不然每次切换屏幕时，Activity都会重新onCreate()这个方法，导致会重新加载，语言回到开始默认的语言........

<manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.nrs.utils"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="15" />    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />    <uses-permission android:name="android.permission.CHANGE_CONFIGURATION" >    </uses-permission>    <application     <span style="font-size:14px;">   android:name=".LanguageApplication"        android:icon="@drawable/ic_launcher"</span>        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name=".tools.MainActivity"            android:configChanges="orientation|screenSize"            android:label="@string/title_activity_main"            android:theme="@android:style/Theme.Black" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <activity            android:name="com.nrs.utils.tools.LangActivity"            android:configChanges="orientation|screenSize" >        </activity>    </application></manifest>

5、

activity_main.xml:

<LinearLayout 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:orientation="vertical"    android:gravity="center_horizontal"><RelativeLayout     android:layout_width="wrap_content"    android:layout_height="wrap_content"  >    <TextView        android:id="@+id/text_view"        android:layout_alignBaseline="@+id/lang"        android:layout_alignBottom="@+id/lang"        android:layout_alignParentLeft="true"        android:layout_width="200dp"        android:layout_height="wrap_content"        android:text="@string/hello_world"/>    <Button         android:layout_width="70dp"        android:layout_height="wrap_content"        android:id="@+id/lang"        android:layout_alignParentRight="true"        android:layout_toRightOf="@id/text_view"        android:text="@string/language_switcher"/>    </RelativeLayout>    <Button android:id="@+id/bt1"        android:layout_width="70dp"        android:layout_height="wrap_content"        android:text="@string/start"/></LinearLayout>

other.xml 代码：

<?xml version="1.0" encoding="utf-8"?><LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="fill_parent"  android:layout_height="wrap_content">  <TextView       android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:text="@string/app_name"/> </LinearLayout>

string.xml代码：

<resources>    <string name="app_name">crash</string>    <string name="hello_world">hello world!</string>    <string name="menu_settings">setting</string>    <string name="title_activity_main">capture crash</string>    <string name="language_switcher">language switcher</string>    <string name="start">start</string>    <string-array name="item">        <item>simplified Chinese</item>        <item>English</item>    </string-array></resources>

6、需要在res文件中新建value-zh-rCN的中英文转换的资源文件，还同时在文件里面新建strings.xml文件，代码如下：

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="app_name">异常</string>    <string name="hello_world">你好世界!</string>    <string name="menu_settings">设置</string>    <string name="title_activity_main">异常捕获</string>    <string name="language_switcher">语言切换</string>    <string name="start">开始</string>    <string-array name="item">        <item>简体中文</item>        <item>英语</item>    </string-array></resources>

7、总结：

     在我测试中英文切换时，如果我在LangActivity的UI界面上快速来回切换横竖屏，会导致出现，app语言会变回开始默认的中文（或者英文），不懂是什么原因（是横切屏切换过快，android系统没反应的那么快嘛？自己想得）。

希望大家可以解答一下，是什么因素导致的？