Android中viewpager滑动指示器的实例代码

public class MainActivity extends FragmentActivity { 
  private ViewPagerFrameAdapter adapter;  //适配器（标题和内容） 
 private ViewPager mPager;        
 private TabPageIndicator   tabbPageIndicator;   // 
 private UnderlinePageIndicatorEx underlinePageIndicator; 
 private int COUNT = 0; 
 private List titles = new ArrayList(); //标题 
 @Override 
 protected void onCreate(Bundle bundle) { 
    super.onCreate(bundle); 
    requestWindowFeature(Window.FEATURE_NO_TITLE); 
    setContentView(R.layout.activity_main); 
    //标题，这里自己造的假数据 
    for (int j = 0; j <3 ; j++){ 
     titles.add( "第"+ j +"标签卡"); 
    } 
    mPager = (ViewPager)findViewById(R.id.pager); 
    adapter = new ViewPagerFrameAdapter(getSupportFragmentManager(),titles); 
    mPager.setAdapter(adapter); 
    //得到指示器 
    tabbPageIndicator = (TabPageIndicator) findViewById(R.id.tab_indicator);  
    tabbPageIndicator.setViewPager(mPager); 
    //下标 
    underlinePageIndicator = (UnderlinePageIndicatorEx)findViewById(R.id.underline_indicator); 
    underlinePageIndicator.setViewPager(mPager); 
    underlinePageIndicator.setFades(false); 
    //设置指示器 
    tabbPageIndicator.setOnPageChangeListener(underlinePageIndicator); 
 } 
 //adapter 没啥好说的 跟前面的一样 
 private class ViewPagerFrameAdapter extends FragmentStatePagerAdapter{ 
  private List title; //页面标题头部数据 
  public ViewPagerFrameAdapter(FragmentManager fm, List title) { 
   super(fm); 
   this.title = title; 
  } 
  //根据position 返回 fragment 
  @Override 
  public Fragment getItem(int position) { 
   return ArrayFragment.newInstance(position); 
  } 
  //size 
  @Override 
  public int getCount() { 
    return title.size(); 
  } 
  //顶部的title 
  @Override 
  public CharSequence getPageTitle(int position) { 
   if (titles != null){ 
    return titles.get(position).toString(); 
   } 
   return super.getPageTitle(position); 
  }  
 } 
} 

//继承这个然后重写 
public class UnderlinePageIndicatorEx extends UnderlinePageIndicator{ 
  public UnderlinePageIndicatorEx(Context context) { 
   super(context, null);   
  } 
  public UnderlinePageIndicatorEx(Context context, AttributeSet attrs) { 
   super(context, attrs, R.attr.vpiUnderlinePageIndicatorStyle);  
  } 
  public UnderlinePageIndicatorEx(Context context, AttributeSet attrs, int defStyle) { 
   super(context, attrs, defStyle);   
  } 
  //自身的 ViewPage传递过去 
  @Override 
  public void setViewPager(ViewPager viewPager) { 
   if (mViewPager == viewPager){ 
    return; 
   } 
//   if (mViewPager != null) { 
//    mViewPager.setOnPageChangeListener(null); 
//   } 
   if (viewPager.getAdapter() == null) { 
    throw new IllegalStateException(" pager 没有 加入 adapter"); 
   } 
   mViewPager = viewPager; 
//   mViewPager.setOnPageChangeListener(this); 
   invalidate(); 
   post(new Runnable(){ 
    @Override public void run() { 
     if (mFades) { 
      post(mFadeRunnable); 
     } 
    }  
   }); 
  } 
} 

public class ArrayFragment extends Fragment{ 
 private int position; 
 public ArrayFragment(int position){ 
  this.position = position; 
 } 
  // 返回 viwePager 下面滑动的页面 
 public static ArrayFragment newInstance(int position){ 
  return new ArrayFragment(position); 
 } 
 @Override 
 public void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
 } 
 @Override 
 public void onDestroy() { 
  super.onDestroy(); 
 } 
 // 根据position 返回不同的view 
 @Override 
 public View onCreateView(LayoutInflater inflater, ViewGroup container, 
   Bundle savedInstanceState) { 
  View view = inflater.inflate(R.layout.layoutaa, null);  
  return view; 
 } 
} 

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