Android基于ViewPager实现的应用欢迎界面完整实例

public class IndexSlide extends Activity implements OnClickListener,    OnPageChangeListener {  private ViewPager vp;  private ViewPagerAdapter vpAdapter;  private List<View> views;  // 引导图片资源  private static final int[] pics = { R.drawable.chun, R.drawable.xia,      R.drawable.qiu, R.drawable.dong };  // 底部小点图片  private ImageView[] dots;  // 记录当前选中位置  private int currentIndex;  @Override  protected void onCreate(Bundle savedInstanceState) {    // TODO Auto-generated method stub    super.onCreate(savedInstanceState);    setContentView(R.layout.indexslide);    views = new ArrayList<View>();    LinearLayout.LayoutParams mParams = new LinearLayout.LayoutParams(        LinearLayout.LayoutParams.WRAP_CONTENT,        LinearLayout.LayoutParams.WRAP_CONTENT);    // 初始化引导图片列表    for (int i = 0; i < pics.length; i++) {      ImageView iv = new ImageView(this);      iv.setLayoutParams(mParams);      iv.setImageResource(pics[i]);      views.add(iv);    }    vp = (ViewPager) findViewById(R.id.page);    // 初始化Adapter    vpAdapter = new ViewPagerAdapter(views);    vp.setAdapter(vpAdapter);    // 绑定回调    vp.setOnPageChangeListener(this);    // 初始化底部小点    initDots();  }  private void initDots() {    LinearLayout ll = (LinearLayout) findViewById(R.id.ll);    dots = new ImageView[pics.length];    // 循环取得小点图片    for (int i = 0; i < pics.length; i++) {      dots[i] = (ImageView) ll.getChildAt(i);      dots[i].setEnabled(true);// 都设为灰色      dots[i].setOnClickListener(this);      dots[i].setTag(i);// 设置位置tag，方便取出与当前位置对应    }    currentIndex = 0;    dots[currentIndex].setEnabled(false);// 设置为白色，即选中状态  }  /**   * 设置当前的引导页   */  private void setCurView(int position) {    if (position < 0 || position >= pics.length) {      return;    }    vp.setCurrentItem(position);  }  /**   * 设置当前引导小点的选中   */  private void setCurDot(int positon) {    if (positon < 0 || positon > pics.length - 1 || currentIndex == positon) {      return;    }    dots[positon].setEnabled(false);    dots[currentIndex].setEnabled(true);    currentIndex = positon;  }  // 当滑动状态改变时调用  public void onPageScrollStateChanged(int arg0) {    // TODO Auto-generated method stub  }  // 当当前页面被滑动时调用  public void onPageScrolled(int arg0, float arg1, int arg2) {    // TODO Auto-generated method stub  }  // 当新的页面被选中时调用  public void onPageSelected(int arg0) {     setCurDot(arg0);  }  public void onClick(View v) {    int position = (Integer) v.getTag();    setCurView(position);    setCurDot(position);  }  class ViewPagerAdapter extends PagerAdapter {    // 界面列表    private List<View> views;    public ViewPagerAdapter(List<View> views) {      this.views = views;    }    // 销毁arg1位置的界面    @Override    public void destroyItem(View arg0, int arg1, Object arg2) {      ((ViewPager) arg0).removeView(views.get(arg1));    }    @Override    public void finishUpdate(View arg0) {      // TODO Auto-generated method stub    }    // 获得当前界面数    @Override    public int getCount() {      if (views != null) {        return views.size();      }      return 0;    }    // 初始化arg1位置的界面    @Override    public Object instantiateItem(View arg0, int arg1) {      ((ViewPager) arg0).addView(views.get(arg1), 0);      return views.get(arg1);    }    // 判断是否由对象生成界面    @Override    public boolean isViewFromObject(View arg0, Object arg1) {      // TODO Auto-generated method stub      return (arg0 == arg1);    }    @Override    public void restoreState(Parcelable arg0, ClassLoader arg1) {      // TODO Auto-generated method stub    }    @Override    public Parcelable saveState() {      // TODO Auto-generated method stub      return null;    }    @Override    public void startUpdate(View arg0) {      // TODO Auto-generated method stub    }  }}

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="match_parent" >  <android.support.v4.view.ViewPager    android:id="@+id/page"    android:layout_width="fill_parent"    android:layout_height="fill_parent" >  </android.support.v4.view.ViewPager> <LinearLayout    android:id="@+id/ll"    android:orientation="horizontal"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_marginBottom="24.0dip"    android:layout_alignParentBottom="true"    android:layout_centerHorizontal="true">    <ImageView      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:layout_gravity="center_vertical"      android:clickable="true"      android:padding="15.0dip"      android:src="@drawable/dot" />    <ImageView      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:layout_gravity="center_vertical"      android:clickable="true"      android:padding="15.0dip"      android:src="@drawable/dot" />    <ImageView      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:layout_gravity="center_vertical"      android:clickable="true"      android:padding="15.0dip"      android:src="@drawable/dot" />    <ImageView      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:layout_gravity="center_vertical"      android:clickable="true"      android:padding="15.0dip"      android:src="@drawable/dot" />  </LinearLayout></RelativeLayout>

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android" >   <item android:state_enabled="true" android:drawable="@drawable/off" />  <item android:state_enabled="false" android:drawable="@drawable/on" /></selector>