很赞的引导界面效果Android控件ImageSwitcher实现

<&＃63;xml version="1.0" encoding="UTF-8"&＃63;>

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  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