详解Android App中创建ViewPager组件的方法

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);}
MyViewPagerAdapter
public 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;
  }
  
  @Override
  public int getCount() {
    return viewList.size();
  }
   
  @Override
  public boolean isViewFromObject(View arg0, Object arg1) {
    return arg0==arg1;
  }
   
  @Override
  public Object instantiateItem(ViewGroup container, int position) {
    container.addView(viewList.get(position));
    return viewList.get(position);
  }
   
  @Override
  public void destroyItem(ViewGroup container, int position, Object object) {
    container.removeView(viewList.get(position));
  }
  
  @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<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();
  }
  @Override
  public Object instantiateItem(ViewGroup arg0, int arg1) {
    return super.instantiateItem(arg0, arg1);
  }
  @Override
  public void destroyItem(ViewGroup container, int position, 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);
    
    MyFragmentPagerAdapter2 adapter = new MyFragmentPagerAdapter2(getSupportFragmentManager(), fragList, 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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