Android屏幕旋转和Configuration的使用

MainActivity如下:

package cn.testconfigurationchange;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.app.Activity;import android.content.res.Configuration;/** * Demo描述: * 测试Configuration和屏幕旋转 *  * 测试步骤: * 1 点击Button利用Configuration查看手机上的配置信息 * 2 在manifest为Activity配置 android:configChanges="orientation" *   由于设备和系统版本的差异,少数情况下该设置无效,建议设置为： *   android:configChanges="keyboardHidden|orientation|screenSize" *   表示当前Activity可以对屏幕是否旋转进行监听(当然也可对其他系统信息进行监听) *   配置后屏幕旋转时会调用onConfigurationChanged()方法. *   若不配置,那么每次屏幕旋转的时候都会调用Activity的onCreate()方法 *   而不会调用onConfigurationChanged() * 3 取消在2中的设置.此时每次旋转屏幕都会调用onCreate(),并在屏幕旋转前 *   调用onSaveInstanceState()保存现场状态,在选中后调用、 *   onRestoreInstanceState()恢复现场. *   所以此时调用顺序为: *   onSaveInstanceState->onCreate()->onRestoreInstanceState() *   除此以外:当系统内存紧张时可暂时杀死该Activity,内存允许时重启 *   该Activity.在这样情况下也是该调用顺序,原理亦类似. *   * 备注说明: * 该Demo的测试为1和2.若要测试3去掉manifest为Activity配置的 * android:configChanges="orientation" 即可 *  */public class MainActivity extends Activity {private Button mButton;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);System.out.println("---> onCreate()");init();}private void init(){mButton=(Button) findViewById(R.id.button);mButton.setOnClickListener(new ClickListenerImpl());}private class ClickListenerImpl implements OnClickListener{@Overridepublic void onClick(View v) {           getConfigurationInfo();}}private void getConfigurationInfo(){Configuration configuration=getResources().getConfiguration();//获取屏幕方向int l=configuration.ORIENTATION_LANDSCAPE;int p=configuration.ORIENTATION_PORTRAIT;if (configuration.orientation==l) {System.out.println("现在是横屏");}if (configuration.orientation==p) {System.out.println("现在是竖屏");}//获取国家码和网络码int countryNum=configuration.mcc;int netNum=configuration.mnc;System.out.println("国家码="+countryNum+",网络码="+netNum);}    @Overridepublic void onConfigurationChanged(Configuration newConfig) {super.onConfigurationChanged(newConfig);System.out.println("---> onConfigurationChanged()");}@Overrideprotected void onSaveInstanceState(Bundle outState) {super.onSaveInstanceState(outState);outState.putString("name", "zxx");outState.putInt("id", 9527);System.out.println("---> onSaveInstanceState()");}@Overrideprotected void onRestoreInstanceState(Bundle savedInstanceState) {super.onRestoreInstanceState(savedInstanceState);String name=savedInstanceState.getString("name");int id=savedInstanceState.getInt("id");System.out.println("---> onRestoreInstanceState()");System.out.println("名字="+name+",编号="+id);}}

main.xml如下:

<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"   >    <Button        android:id="@+id/button"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="获取Configuration信息"        android:textSize="25sp"        android:layout_marginTop="80dip"        android:layout_centerHorizontal="true"        />        <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="测试ConfigurationChange"        android:textSize="25sp"        android:layout_centerInParent="true"    /></RelativeLayout>

 

AndroidManifest.xml如下:

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="cn.testconfigurationchange"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="8" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name="cn.testconfigurationchange.MainActivity"            android:configChanges="orientation"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application></manifest>