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;  }}