详解Android App中创建ViewPager组件的方法

概述现在很多app一打开就是一个ViewPager，然后可以用手指滑，每滑一次就换一张图，底下还会有圈圈表示说现在滑到第几章~

现在很多app一打开就是一个VIEwPager，然后可以用手指滑，每滑一次就换一张图，底下还会有圈圈表示说现在滑到第几章~
通常这些图片都是放功能简介或是使用教学之类的，我的需求很简单，就是上面提到的那样而已。
有两种做法，一种是找现有套件，查了一堆资料每个都跟我推荐VIEwPagerIndicator这套，我之前也看过这套，只是看起来需要有fragment再加上Google play范例好像载不到了，所以只好自己实做一个。
VIEwpager的实作可参考AndroID VIEwPager使用详解里面的程序码:

@OverrIDeprotected voID onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentVIEw(R.layout.activity_intro);  mVIEwPager = (VIEwPager) findVIEwByID(R.ID.vIEwpager);  final LayoutInflater mInflater = getLayoutInflater().from(this);  VIEw v1 = mInflater.inflate(R.layout.intro_layout_1,null);  VIEw v2 = mInflater.inflate(R.layout.intro_layout_2,null);  VIEw v3 = mInflater.inflate(R.layout.intro_layout_3,null);  VIEw v4 = mInflater.inflate(R.layout.intro_layout_4,null);  vIEwList = new ArrayList<VIEw>();  vIEwList.add(v1);  vIEwList.add(v2);  vIEwList.add(v3);  vIEwList.add(v4);  mVIEwPager.setAdapter(new MyVIEwPagerAdapter(vIEwList));  mVIEwPager.setCurrentItem(0);}MyVIEwPagerAdapterpublic class MyVIEwPagerAdapter extends PagerAdapter {  private List<VIEw> mListVIEws;  public MyVIEwPagerAdapter(List<VIEw> mListVIEws) {    this.mListVIEws = mListVIEws;  }  @OverrIDe  public voID destroyItem(VIEwGroup container,int position,Object object)  {    container.removeVIEw((VIEw) object);  }  @OverrIDe  public Object instantiateItem(VIEwGroup container,int position) {    VIEw vIEw = mListVIEws.get(position);    container.addVIEw(vIEw);    return vIEw;  }  @OverrIDe  public int getCount() {    return mListVIEws.size();  }  @OverrIDe  public boolean isVIEwFromObject(VIEw arg0,Object arg1) {    return arg0==arg1;  }}

这样子你就有一个VIEwPager了

下面我们来具体看一下VIEwPager的用法：
一、VIEwPager创建步骤
① 在XML布局中加入androID.support.v4.vIEw.VIEwPager

② 加载显示的页卡将Layout布局转换为VIEw对象

  (1) 

LayoutInflater lf getLayoutInflater().from(this);  lf.inflate(resource,root);

  (2)

VIEw.inflate(context,resource,root);

③ 配置Adapter（三种Adapter）

 (1)PagerAdapter 数据源：List<VIEw>
 (2)FragmentPagerAdapter 数据源：List<Fragment>
 (3)FragmentStatePagerAdapter 数据源：List<Fragment>
二、代码示例
新建四个Fragment和他们的布局下面是MainActivity的xml布局：

<androID.support.v4.vIEw.VIEwPager    androID:ID="@+ID/pager"    androID:layout_wIDth="match_parent"    androID:layout_height="match_parent"    androID:layout_gravity="center" >    <androID.support.v4.vIEw.PagerTabStrip      androID:ID="@+ID/tab"      androID:layout_wIDth="wrap_content"      androID:layout_height="wrap_content"      androID:layout_gravity="top" >    </androID.support.v4.vIEw.PagerTabStrip>    <!-- 底部显示标题与上面的顶部显示不能同时出现    <androID.support.v4.vIEw.PagerTitleStrip      androID:ID="@+ID/Title"      androID:layout_wIDth="wrap_content"      androID:layout_height="wrap_content"      androID:layout_gravity="bottom" >    </androID.support.v4.vIEw.PagerTitleStrip>    -->  </androID.support.v4.vIEw.VIEwPager>

第一种PagerAdapter

public class MyPagerAdapter extends PagerAdapter {  private List<VIEw> vIEwList;  private List<String> TitleList;  public MyPagerAdapter(List<VIEw> vIEwList,List<String> TitleList){    this.vIEwList = vIEwList;    this.TitleList = TitleList;  }  /**   * 返回页卡的数量   */  @OverrIDe  public int getCount() {    return vIEwList.size();  }   /**   * vIEw是否来自对象   */  @OverrIDe  public boolean isVIEwFromObject(VIEw arg0,Object arg1) {    return arg0==arg1;  }   /**   * 实例化一个页卡   */  @OverrIDe  public Object instantiateItem(VIEwGroup container,int position) {    container.addVIEw(vIEwList.get(position));    return vIEwList.get(position);  }   /**   * 销毁一个页卡   */  @OverrIDe  public voID destroyItem(VIEwGroup container,Object object) {    container.removeVIEw(vIEwList.get(position));  }  /**   * 设置VIEwPager的标题   */  @OverrIDe  public CharSequence getPageTitle(int position) {    return TitleList.get(position);  }}

第二种FragmentPagerAdapter

public class MyFragmentPagerAdapter extends FragmentPagerAdapter {  private List<Fragment> fragList;  private List<String> TitleList;  public MyFragmentPagerAdapter(FragmentManager fm,List<Fragment> fragList,List<String> TitleList) {    super(fm);    this.fragList = fragList;    this.TitleList = TitleList;  }  @OverrIDe  public Fragment getItem(int arg0) {    return fragList.get(arg0);  }  @OverrIDe  public CharSequence getPageTitle(int position) {    return TitleList.get(position);  }  @OverrIDe  public int getCount() {    return fragList.size();  }}

第三种FragmentStatePagerAdapter（该适配器可以动态销毁Fragment）

public class MyFragmentPagerAdapter2 extends FragmentStatePagerAdapter {//该适配器可以动态销毁  private List<Fragment> fragList;  private List<String> TitleList;  public MyFragmentPagerAdapter2(FragmentManager fm,List<String> TitleList) {    super(fm);    this.fragList = fragList;    this.TitleList = TitleList;  }  @OverrIDe  public Fragment getItem(int arg0) {    return fragList.get(arg0);  }  @OverrIDe  public CharSequence getPageTitle(int position) {    return TitleList.get(position);  }  @OverrIDe  public int getCount() {    return fragList.size();  }  @OverrIDe  public Object instantiateItem(VIEwGroup arg0,int arg1) {    return super.instantiateItem(arg0,arg1);  }  @OverrIDe  public voID destroyItem(VIEwGroup container,Object object) {    super.destroyItem(container,position,object);  }}

MainActivity里使用getSupportFragmentManager()该Activity必须继承FragmentActivity：

public class MainActivity extends FragmentActivity implements OnPagechangelistener{  private List<VIEw> vIEwList;  private List<String> TitleList;  private VIEwPager pager;  private PagerTabStrip tab;//顶部标题  private List<Fragment> fragList;  @OverrIDe  protected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_main);    vIEwList = new ArrayList<VIEw>();    TitleList = new ArrayList<String>();    tab = (PagerTabStrip) findVIEwByID(R.ID.tab);    VIEw vIEw1 = VIEw.inflate(this,R.layout.vIEw1,null);    VIEw vIEw2 = VIEw.inflate(this,R.layout.vIEw2,null);    VIEw vIEw3 = VIEw.inflate(this,R.layout.vIEw3,null);    VIEw vIEw4 = VIEw.inflate(this,R.layout.vIEw4,null);    vIEwList.add(vIEw1);    vIEwList.add(vIEw2);    vIEwList.add(vIEw3);    vIEwList.add(vIEw4);    fragList = new ArrayList<Fragment>();    fragList.add(new Fragment1());    fragList.add(new Fragment2());    fragList.add(new Fragment3());    fragList.add(new Fragment4());    //为VIEwPager页卡设置标题    TitleList.add("第一页");    TitleList.add("第二页");    TitleList.add("第三页");    TitleList.add("第四页");    //为PagerTabStrip设置一些属性    tab.setBackgroundcolor(color.WHITE);    tab.setDrawFullUnderline(false);    tab.setTabIndicatorcolor(color.BLUE);    pager = (VIEwPager) findVIEwByID(R.ID.pager);    //MyPagerAdapter adapter = new MyPagerAdapter(vIEwList,TitleList);    //MyFragmentPagerAdapter adapter = new MyFragmentPagerAdapter(getSupportFragmentManager(),fragList,TitleList);    /**     * 使用getSupportFragmentManager()该Activity必须继承FragmentActivity     */    MyFragmentPagerAdapter2 adapter = new MyFragmentPagerAdapter2(getSupportFragmentManager(),TitleList);    pager.setAdapter(adapter);    pager.setonPagechangelistener(this);  }  @OverrIDe  public voID onPageScrollStateChanged(int arg0) {  }  @OverrIDe  public voID onPageScrolled(int arg0,float arg1,int arg2) {  }  @OverrIDe  public voID onPageSelected(int arg0) {    Toast.makeText(this,"当前是第"+(arg0+1)+"个界面",0).show();  }}

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