android 开发之Activity切换

演示从一个Activity切换到另外的一个Activity.

 

第一个Activity

 

 ActivitySecond.java代码

import  android.app.Activity;
import  android.content.Intent;
import  android.os.Bundle;
import  android.view.View;
import  android.view.View.OnClickListener;
import  android.widget.Button;

public   class  ActivitySecond  extends  Activity
{
     private  Button btn2;
     private  Button btnClose;

    @Override
     protected   void  onCreate(Bundle savedInstanceState)
    {
         super .onCreate(savedInstanceState);
        setContentView(R.layout.second_activity);
        btn2  =  (Button) findViewById(R.id.btn_back);
        btn2.setOnClickListener( new  OnClickListener()
        {

             public   void  onClick(View v)
            {
                Intent intent  =   new  Intent();
                intent.setClass(ActivitySecond. this , ActivityChange. class );
                startActivity(intent);
                 // 如果不关闭当前的会出现好多个页面
                ActivitySecond. this .finish();
            }

        });
        btnClose  =  (Button) findViewById(R.id.btn_close);
        btnClose.setOnClickListener( new  OnClickListener()
        {

             public   void  onClick(View v)
            {
                finish();
            }

        });
    }

}

 

 ActivityChange.java代码

import  android.app.Activity;
import  android.content.Intent;
import  android.os.Bundle;
import  android.view.View;
import  android.view.View.OnClickListener;
import  android.widget.Button;

public   class  ActivityChange  extends  Activity {
    
     private  Button btn;
     private  Button btnClose;
    
    @Override
     public   void  onCreate(Bundle savedInstanceState) {
         super .onCreate(savedInstanceState);
        setContentView(R.layout.main);
        btn = (Button)findViewById(R.id.btnNextView);
        btn.setOnClickListener( new  OnClickListener()
        {
             public   void  onClick(View v)
            {
                Intent itent = new  Intent();
                itent.setClass(ActivityChange. this , ActivitySecond. class );
                startActivity(itent);
                ActivityChange. this .finish();
            }
        });
        
        btnClose = (Button)findViewById(R.id.btn_exit);
        btnClose.setOnClickListener( new  OnClickListener()
        {
             public   void  onClick(View v)
            {
                finish();
            }
        });
    }
}

 

main.xml代码

<? xml version="1.0" encoding="utf-8" ?>
< LinearLayout  xmlns:android ="http://schemas.android.com/apk/res/android"
    android:orientation ="vertical"
    android:layout_width ="fill_parent"
    android:layout_height ="fill_parent"
     >
< TextView  
     android:layout_width ="fill_parent"  
    android:layout_height ="wrap_content"  
    android:text ="@string/hello"
     />
< Button 
     android:id ="@+id/btnNextView"
    android:layout_width ="wrap_content"
    android:layout_height ="wrap_content"
    android:text ="@string/show_next"
/>

< Button 
     android:id ="@+id/btn_exit"
    android:layout_width ="wrap_content"
    android:layout_height ="wrap_content"
    android:text ="@string/btn_close"
/>
</ LinearLayout >

 

 second_activity.xml代码

 

AndroidManifest.xml代码

<? xml version="1.0" encoding="utf-8" ?>
< manifest  xmlns:android ="http://schemas.android.com/apk/res/android"
      package ="activity.change"
      android:versionCode ="1"
      android:versionName ="1.0" >
     < application  android:icon ="@drawable/icon"  android:label ="@string/app_name" >
         < activity  android:name =".ActivityChange"
                  android:label ="@string/app_name" >
             < intent-filter >
                 < action  android:name ="android.intent.action.MAIN"   />
                 < category  android:name ="android.intent.category.LAUNCHER"   />
             </ intent-filter >
         </ activity >
         < activity 
             android:name ="ActivitySecond"
         />
     </ application >

</ manifest >