when we want to change android system default language on our own application,we can use java reflection mechanism to invoke android non public methods

changelocale

updateLanguage(Locale.SIMPLIFIED_CHINESE);
updateLanguage(Locale.ENGLISH);  
 
..
..
..
..
 
private void updateLanguage(Locale locale) {
  	Log.d("ANDROID_LAB", locale.toString());
		try {
			Object objIActMag, objActMagNative;
			Class clzIActMag = Class.forName("android.app.IActivityManager");
			Class clzActMagNative = Class.forName("android.app.ActivityManagerNative");
			Method getDefault = clzActMagNative.getDeclaredMethod("getDefault");
			// IActivityManager iActMag = ActivityManagerNative.getDefault();
			objIActMag = getDefault.invoke(clzActMagNative);
			// Configuration config = iActMag.getConfiguration();
			Method getConfiguration = clzIActMag.getDeclaredMethod("getConfiguration");
			Configuration config = (Configuration) getConfiguration.invoke(objIActMag);
			config.locale = locale;
			Class[] clzParams = { Configuration.class };
			Method updateConfiguration = clzIActMag.getDeclaredMethod(
					"updateConfiguration", clzParams);
			updateConfiguration.invoke(objIActMag, config);
		} catch (Exception e) {
			e.printStackTrace();
		}
}