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;
  }

}