Android屏幕旋转和Configuration的使用示范

Android屏幕旋转和Configuration的使用演示

转自：http://blog.csdn.net/lfdfhl/

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>