/**
*问题：今天学习android访问Servlet，Servlet给返回一个xml格式的字符串，android得到数据后将其显示到一个TextView中，发现Activity得到数据显
* 示到TextView后，如果旋转屏幕，Activity会回到初始状态，TextView中加载的内容销毁了，这在一个发布的应用中显然是不靠谱的
*原因：网上一堆搜以后，自己也实测了下，发现原来默认情况下屏幕旋转后，会调用Activity的onDestroy和onCreate方法，这样Activity就会重新加载
* layout布局文件，一切回到原点，TextView中自然没数据了
*解决办法：在AndroidManifest.xml中给Activity加配置属性,黄色背景字段，添加该配置后就不会再调用onDestroy和onCreate方法，而是会调用
* onConfigurationChanged方法以新的屏幕尺寸来设置这个Activity
<activity android:name="com.example.androidweb.xml.XmlActivity" android:label="@string/xml_parse" android:configChanges="orientation|screenSize"> </activity>
*/
/**测试截图**********************************************************************/
/**加了配置，(图中的create调用了是第一次调用，不是横屏的时候调用的，截图时疏忽了)*/
/**没有加配置**********************************************************/
/**来段源码,英文有限，意会即可****************************************************************/
/** * Called by the system when the device configuration changes while your * activity is running.
* (当activity运行时，你的设备属性发生变化系统将会调用（该方法）)
* Note that this will <em>only</em> be called if * you have selected configurations you would like to handle with the * {@link android.R.attr#configChanges} attribute in your manifest.
* 需要注意的是，当且仅当你在manifest文件（AndroidManifest.xml）中配置了android.R.attr#configChanges对
* 应的属性（onconfigChanges属性），该方法才会被调用
* If any configuration change occurs that is not selected to be reported
* by that attribute, then instead of reporting it the system will stop * and restart the activity (to have it launched with the new * configuration). * 如果没有配置该属性，那么当任何配置属性发生变化时，系统将会停止并重启该activity，而不是以新属性重新配置activity * <p>At the time that this function has been called, your Resources * object will have been updated to return resource values matching the * new configuration. * * @param newConfig The new device configuration. */ public void onConfigurationChanged(Configuration newConfig) { if (DEBUG_LIFECYCLE) Slog.v(TAG, "onConfigurationChanged " + this + ": " + newConfig); mCalled = true; mFragments.dispatchConfigurationChanged(newConfig);//配置fragment if (mWindow != null) { // Pass the configuration changed event to the window mWindow.onConfigurationChanged(newConfig);//有window对象，配置window } if (mActionBar != null) { // Do this last; the action bar will need to access // view changes from above. mActionBar.onConfigurationChanged(newConfig);//有actionBar，配置actionBar } }