(Android Control) ViewPager introduction and instructions for use

1 ViewPagerImplemented FunctionsAnd actual running

The ViewPager class provides new effects of multi-interface switching. The new effect has the following features:

[1] One of the interfaces in A group is currently displayed.

[2] when a user slides between the left and right, the current screen displays the current interface and a part of the next interface.

[3] After sliding, the page automatically jumps to the selected page

 

The following is the implementation

 

2How to Use ViewPagerWidget

 

2.1Reference ViewPagerWidget

ViewPager comes from google's complementary component android-support-v13.jar, which is located in the androidSDK folder

Android-sdk-windows \ extras \ android \ compatibility \ v13

 

Reference android-support-v13.jar to a project

 

2.2Configuration page file

<Android. support. v4.view. ViewPager

Android: id ="@ + Id/viewPager1"

Android: layout_width ="Fill_parent"

Android: layout_height ="Fill_parent"

Android: layout_alignLeft ="@ + Id/textView1"

Android: layout_above ="@ Id/adLayout"

Android: layout_below ="@ Id/topText"

Android: layout_centerVertical ="True"/>

 

2.3SetViewPagerControl Adapter

The ViewPager adapter inherits from the PagerAdapter base class and implements the following four methods:

// Obtain the number of interfaces of the current form

Public int getCount ()

// Initialize the position page

Public Object instantiateItem (View collection, int position)

 

// Destroy the position page

Public void destroyItem (View collection, int position, Object view)

 

// Determine whether the interface is generated by the object

Public boolean isViewFromObject (View arg0, Object arg1)

 

3Initialize ViewPagerWidget

Initialize the adapter of the ViewPager Control

 

ViewPager1 = (ViewPager) findViewById (R. id.ViewPager1);

ViewPager1.setAdapter (NewImgPagerAdapter (This, Lists ));

 

Configure page change events for the adapter

ViewPager1

. SetOnPageChangeListener (NewOnPageChangeListener (){

// Select on the page

@ Override

Public VoidOnPageSelected (IntPosition ){

TopText. setText (String.ValueOf(Position + 1) + "/" + String.ValueOf(Lists. length ));

}

 

@ Override

Public VoidOnPageScrollStateChanged (IntState ){

}

 

@ Override

Public VoidOnPageScrolled (IntPosition,

FloatPositionOffset,IntPositionOffsetPixels ){

}

});

 

 

Appendix:

Android Market of science back words-Level 4 edition: http://static.apk.hiapk.com/html/2012/07/719368.html