屏幕方向改变实例

main.xml

 

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

     android:layout_width="fill_parent"

     android:layout_height="fill_parent"

     android:orientation="vertical" >

     

     <Button

         android:id="@+id/button1"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:text="点击改变图片和方向"

         />

     <ImageView

         android:id="@+id/img"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:src="@drawable/mldn_landscape"

         />

</LinearLayout>

 

 

ClickProjectActivity.java

 

package cn.com;

 

import android.app.Activity;

import android.content.pm.ActivityInfo;

import android.content.res.Configuration;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.ImageView;

 

public class ClickProjectActivity extends Activity {

     /** Called when the activity is first created. */

     private Button but=null;

     private ImageView img=null;

     @Override

     public void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.main);

         but=(Button) findViewById(R.id.button1);

         img=(ImageView) findViewById(R.id.img);

         but.setOnClickListener(new OnClikeChangeImg() );

     }

     

     //单击事件

     private class OnClikeChangeImg implements OnClickListener{

 

         public void onClick(View v) {

             if(ClickProjectActivity.this.getRequestedOrientation()==ActivityInfo.SCREEN_ORIENTATION_NOSENSOR){

                 but.setText("改变图片和方向发生错误！");

             }else if(ClickProjectActivity.this.getRequestedOrientation()==ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE){

                 ClickProjectActivity.this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

             }else if(ClickProjectActivity.this.getRequestedOrientation()==ActivityInfo.SCREEN_ORIENTATION_PORTRAIT){

                 ClickProjectActivity.this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

             }

             

         }  

         

     }

 

     @Override

     //此方法用于表示系统设置修改的时候触发的

     public void onConfigurationChanged(Configuration newConfig) {

         super.onConfigurationChanged(newConfig);

         if(newConfig.orientation==Configuration.ORIENTATION_LANDSCAPE){

             img.setImageResource(R.drawable.mldn_portrait);

         }else if(newConfig.orientation==Configuration.ORIENTATION_PORTRAIT){

             img.setImageResource(R.drawable.mldn_landscape);

         }

     }

     

}

 

AndroidManifest.xml

 

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

     package="cn.com"

     android:versionCode="1"

     android:versionName="1.0" >

 

     <uses-sdk android:minSdkVersion="15" />

 

     <application

         android:icon="@drawable/ic_launcher"

         android:label="@string/app_name" >

         <activity

             android:name=".ClickProjectActivity"

             android:label="@string/app_name"

             android:screenOrientation="portrait"  //默认屏幕显示的方式

             // 注意：自从Android 3.2（API 13），screen size也开始跟着设备的横竖切换而改变。

             // 如果你想阻止程序在运行时重新加载Activity，除了设置"orientation"，你还必须设置"ScreenSize"

             android:configChanges="orientation|screenSize"> //配置configChanges事件

             <intent-filter>

                 <action android:name="android.intent.action.MAIN" />

 

                 <category android:name="android.intent.category.LAUNCHER" />

             </intent-filter>

         </activity>

     </application>

     <uses-permission android:name="android.permission.CHANGE_CONFIGURATION"/>   //设置允许改变配置信息的权限

</manifest>

运行结果如下：