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;
	@Override
	protected 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{
		@Override
		public 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);
	}
    
	@Override
	public void onConfigurationChanged(Configuration newConfig) {
		super.onConfigurationChanged(newConfig);
		System.out.println("---> onConfigurationChanged()");
	}
	
	@Override
	protected void onSaveInstanceState(Bundle outState) {
		super.onSaveInstanceState(outState);
		outState.putString("name", "zxx");
		outState.putInt("id", 9527);
		System.out.println("---> onSaveInstanceState()");
	}
	
	@Override
	protected 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>