很赞的引导界面效果Android控件ImageSwitcher实现

<?xml version="1.0" encoding="utf-8"?>
<framelayout xmlns:android="http://schemas.android.com/apk/res/android"
       android:layout_width="fill_parent"
       android:layout_height="fill_parent">

  <imageswitcher
    android:id="@+id/imageswitcher"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
  </imageswitcher>

  <relativelayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <linearlayout
      android:id="@+id/ll_view"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:layout_alignparentbottom="true"
      android:layout_marginbottom="30dp"
      android:gravity="center_horizontal"
      android:orientation="horizontal">
    </linearlayout>
  </relativelayout>
</framelayout>

public class imageswitcheractivity extends activity implements viewswitcher.viewfactory, view.ontouchlistener {
  private int[] imgids;//图片id数组
  private int currentposition;//当前选中的图片id序号
  private imageswitcher mimageswitcher;//imagaswitcher 的引用

  private float downx;//按下点的x坐标
  private imageview[] tips;//点点数组
  private linearlayout linearlayout;//装载点点的容器

  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_switcher);

    imgids = new int[]{r.drawable.bg, r.drawable.c2, r.drawable.c3, r.drawable.c4, r.drawable.c5, r.drawable.c6, r.drawable.c7, r.drawable.c8, r.drawable.c9};

    mimageswitcher = (imageswitcher) findviewbyid(r.id.imageswitcher);//实例化imageswitcher
    mimageswitcher.setfactory(this); //设置factory
    mimageswitcher.setontouchlistener(this);//设置ontouchlistener，我们通过touch事件来切换图片

    linearlayout = (linearlayout) findviewbyid(r.id.ll_view);//指示器布局
    tips = new imageview[imgids.length];
    for (int i = 0; i < imgids.length; i++) {
      imageview mimageview = new imageview(this);
      tips[i] = mimageview;
      linearlayout.layoutparams layoutparams = new linearlayout.layoutparams(new viewgroup.layoutparams(layoutparams.wrap_content, layoutparams.wrap_content));
      layoutparams.rightmargin = 3;
      layoutparams.leftmargin = 3;

      mimageview.setbackgroundresource(r.drawable.page_indicator_unfocused);
      linearlayout.addview(mimageview, layoutparams);
    }

    //上一个界面传过来的位置
    currentposition = getintent().getintextra("position", 0);
    mimageswitcher.setimageresource(imgids[currentposition]);

    setimagebackground(currentposition);

  }

  //设置选中的tip的背景
  private void setimagebackground(int selectitems) {
    for (int i = 0; i < tips.length; i++) {
      if (i == selectitems) {
        tips[i].setbackgroundresource(r.drawable.page_indicator_focused);
      } else {
        tips[i].setbackgroundresource(r.drawable.page_indicator_unfocused);
      }
    }
  }

  @override
  public view makeview() {
    final imageview i = new imageview(this);
    i.setbackgroundcolor(0xff000000);
    i.setscaletype(imageview.scaletype.center_crop);
    i.setlayoutparams(new imageswitcher.layoutparams(layoutparams.match_parent, layoutparams.match_parent));
    return i;
  }

  @override
  public boolean ontouch(view v, motionevent event) {
    switch (event.getaction()) {
      case motionevent.action_down: {
        downx = event.getx();//手指按下的x坐标
        break;
      }
      case motionevent.action_up: {
        float lastx = event.getx();
        //抬起的时候的x坐标大于按下的时候就显示上一张图片
        if (lastx > downx) {
          if (currentposition > 0) {
            //设置动画
            mimageswitcher.setinanimation(animationutils.loadanimation(getapplication(), r.anim.left_in));
            mimageswitcher.setoutanimation(animationutils.loadanimation(getapplication(), r.anim.right_out));
            currentposition--;
            mimageswitcher.setimageresource(imgids[currentposition % imgids.length]);
            setimagebackground(currentposition);
          } else {
            toast.maketext(getapplication(), "已经是第一张", toast.length_short).show();
          }
        }

        if (lastx < downx) {
          if (currentposition < imgids.length - 1) {
            mimageswitcher.setinanimation(animationutils.loadanimation(getapplication(), r.anim.right_in));
            mimageswitcher.setoutanimation(animationutils.loadanimation(getapplication(), r.anim.lift_out));
            currentposition++;
            mimageswitcher.setimageresource(imgids[currentposition]);
            setimagebackground(currentposition);
          } else {
            toast.maketext(getapplication(), "到了最后一张", toast.length_short).show();
          }
        }
      }

      break;
    }

    return true;
  }

}