Android的 ViewPager 学习笔记

ViewPager用于实现多页面的切换效果，该类存在于Google的兼容包里面，所以在引用时记得在BuilldPath中加入“android-support-v4.jar”

主布局文件

main.xml

01<?xmlversion="1.0"encoding="utf-8"?>

02<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"

03    android:layout_width="fill_parent"

04    android:layout_height="fill_parent"

05    android:orientation="vertical">

06 

07    <android.support.v4.view.ViewPager

08        android:id="@+id/viewpager"

09        android:layout_width="wrap_content"

10        android:layout_height="wrap_content"

11        android:layout_gravity="center">

12 

13        <android.support.v4.view.PagerTitleStrip

14            android:id="@+id/pagertitle"

15            android:layout_width="wrap_content"

16            android:layout_height="wrap_content"

17            android:layout_gravity="top"/>

18    </android.support.v4.view.ViewPager>

19 

20</LinearLayout>

其中ViewPager为多页显示控件，PagerTitleStrip用于显示当前页面的标题

主窗口代码：

PagerTitleDemoActivity.java

01package com.ns.pager;

02 

03import java.util.ArrayList;

04 

05import android.app.Activity;

06import android.os.Bundle;

07import android.support.v4.view.PagerAdapter;

08import android.support.v4.view.PagerTitleStrip;

09import android.support.v4.view.ViewPager;

10import android.view.LayoutInflater;

11import android.view.View;

12 

13public classPagerTitleDemoActivity extendsActivity {

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

15    privateViewPager mViewPager;

16    privatePagerTitleStrip mPagerTitleStrip;

17    @Override

18    publicvoid onCreate(Bundle savedInstanceState) {

19        super.onCreate(savedInstanceState);

20        setContentView(R.layout.main);

21        mViewPager = (ViewPager)findViewById(R.id.viewpager);

22        mPagerTitleStrip = (PagerTitleStrip)findViewById(R.id.pagertitle);

23         

24        //将要分页显示的View装入数组中

25        LayoutInflater mLi = LayoutInflater.from(this);

26        View view1 = mLi.inflate(R.layout.view1,null);

27        View view2 = mLi.inflate(R.layout.view2,null);

28        View view3 = mLi.inflate(R.layout.view3,null);

29         

30        //每个页面的Title数据

31        finalArrayList<View> views = newArrayList<View>();

32        views.add(view1);

33        views.add(view2);

34        views.add(view3);

35         

36        finalArrayList<String> titles = newArrayList<String>();

37        titles.add("tab1");

38        titles.add("tab2");

39        titles.add("tab3");

40         

41        //填充ViewPager的数据适配器

42        PagerAdapter mPagerAdapter =new PagerAdapter() {

43             

44            @Override

45            publicboolean isViewFromObject(View arg0, Object arg1) {

46                returnarg0 == arg1;

47            }

48             

49            @Override

50            publicint getCount() {

51                returnviews.size();

52            }

53 

54            @Override

55            publicvoid destroyItem(View container,int position, Object object) {

56                ((ViewPager)container).removeView(views.get(position));

57            }

58 

59            @Override

60            publicCharSequence getPageTitle(intposition) {

61                returntitles.get(position);

62            }

63 

64            @Override

65            publicObject instantiateItem(View container, intposition) {

66                ((ViewPager)container).addView(views.get(position));

67                returnviews.get(position);

68            }

69        };

70         

71        mViewPager.setAdapter(mPagerAdapter);

72    }

73}