Android利用ViewPager实现用户引导界面效果 Android利用ViewPager实现用户引导界面效果的方法

/**
 * @author manymore13
 */
public class GuideActivity extends Activity {
  // 到达最后一张
  private static final int TO_THE_END = 0;
  // 离开最后一张
  private static final int LEAVE_FROM_END = 1;
  // 如果想直接应用到你的项目中，只需在这里添加删除图片id即可
  private int[] ids = { R.drawable.guide_1,
      R.drawable.guide_3, R.drawable.guide_5,
      R.drawable.guide_6,R.drawable.guide_7
       };
  private List<View> guides = new ArrayList<View>();
  private ViewPager pager;
  private ImageView start;     // 点击体验
  private ImageView curDot;
  private LinearLayout dotContain; // 存储点的容器
  private int offset;       // 位移量
  private int curPos = 0;     // 记录当前的位置
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.main);
    init();
  }
  private ImageView buildImageView(int id)
  {
    ImageView iv = new ImageView(this);
    iv.setImageResource(id);
    ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(
        ViewGroup.LayoutParams.FILL_PARENT,
        ViewGroup.LayoutParams.FILL_PARENT);
    iv.setLayoutParams(params);
    iv.setScaleType(ScaleType.FIT_XY);
    return iv;
  }
  // 功能介绍界面的初始化
  private void init()
  {
    this.getView();
    initDot();
    ImageView iv = null;
    guides.clear();
    for (int i = 0; i < ids.length; i++) {
      iv = buildImageView(ids[i]);
      guides.add(iv);
    }
    System.out.println("guild_size="+guides.size());
    // 当curDot的所在的树形层次将要被绘出时此方法被调用
    curDot.getViewTreeObserver().addOnPreDrawListener(
        new OnPreDrawListener() {
          public boolean onPreDraw() {
            // 获取ImageView的宽度也就是点图片的宽度
            offset = curDot.getWidth();
            return true;
          }
        });
    final GuidePagerAdapter adapter = new GuidePagerAdapter(guides);
    // ViewPager设置数据适配器，这个类似于使用ListView时用的adapter
    pager.setAdapter(adapter);
    pager.clearAnimation();
    // 为Viewpager添加事件监听器 OnPageChangeListener
    pager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener(){
      @Override
      public void onPageSelected(int position)
      {
        int pos = position % ids.length;
        moveCursorTo(pos);
        if (pos == ids.length-1) {// 到最后一张了
          handler.sendEmptyMessageDelayed(TO_THE_END, 500);
        } else if (curPos == ids.length - 1) {
          handler.sendEmptyMessageDelayed(LEAVE_FROM_END, 100);
        }
        curPos = pos;
        super.onPageSelected(position);
      }
    });
  }
  /**
   * 在layout中实例化一些View
   */
  private void getView()
  {
    dotContain = (LinearLayout)this.findViewById(R.id.dot_contain);
    pager = (ViewPager) findViewById(R.id.contentPager);
    curDot = (ImageView) findViewById(R.id.cur_dot);
    start = (ImageView) findViewById(R.id.open);
    start.setOnClickListener(new OnClickListener()
    {
      public void onClick(View v)
      {
        // 点击体验
      }
    });
  }
  /**
   * 初始化点 ImageVIew
   * @return 返回true说明初始化点成功，否则实例化失败
   */
  private boolean initDot()
  {
    if(ids.length > 0){
      ImageView dotView ;
      for(int i=0; i<ids.length; i++)
      {
        dotView = new ImageView(this);
        dotView.setImageResource(R.drawable.dot1_w);
        dotView.setLayoutParams(new LinearLayout.LayoutParams(
            ViewGroup.LayoutParams.WRAP_CONTENT,
            ViewGroup.LayoutParams.WRAP_CONTENT,1.0f));
        dotContain.addView(dotView);
      }
      return true;
    }else{
      return false;
    }
  }
  /**
   * 移动指针到相邻的位置 动画
   * @param position
   * 指针的索引值
   * */
  private void moveCursorTo(int position) {
    AnimationSet animationSet = new AnimationSet(true);
    TranslateAnimation tAnim =
        new TranslateAnimation(offset*curPos, offset*position, 0, 0);
    animationSet.addAnimation(tAnim);
    animationSet.setDuration(300);
    animationSet.setFillAfter(true);
    curDot.startAnimation(animationSet);
  }
  Handler handler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
      if (msg.what == TO_THE_END)
        start.setVisibility(View.VISIBLE);
      else if (msg.what == LEAVE_FROM_END)
        start.setVisibility(View.GONE);
    }
  };
  // ViewPager 适配器
  class GuidePagerAdapter extends PagerAdapter{
    private List<View> views;
    public GuidePagerAdapter(List<View> views){
      this.views=views;
    }
    @Override
    public void destroyItem(View arg0, int arg1, Object arg2) {
      ((ViewPager) arg0).removeView(views.get(arg1 % views.size()));
    }
    @Override
    public void finishUpdate(View arg0) {
    }
    @Override
    public int getCount() {
      // 注意这里一定要返回一个稍微大点值,不然滑到顶就滑不动了
      return views.size()*20;
    }
    @Override
    public Object instantiateItem(View arg0, int arg1) {
      Log.e("tag", "instantiateItem = "+arg1);
      ((ViewPager) arg0).addView(views.get(arg1 % views.size()),0);
      return views.get(arg1 % views.size());
    }
    @Override
    public boolean isViewFromObject(View arg0, Object arg1) {
      return arg0 == (arg1);
    }
    @Override
    public void restoreState(Parcelable arg0, ClassLoader arg1) {
    }
    @Override
    public Parcelable saveState() {
      return null;
    }
    @Override
    public void startUpdate(View arg0) {
    }
  }
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:orientation="vertical" >
  <android.support.v4.view.ViewPager
    android:id="@+id/contentPager"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_gravity="center"
    android:flipInterval="30"
    android:persistentDrawingCache="animation" />
  <FrameLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:gravity="center"
    android:layout_marginBottom="22.0dip">
    <LinearLayout
      android:id="@+id/dot_contain"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:gravity="center"
      android:orientation="horizontal" >
    </LinearLayout>
    <ImageView
      android:id="@+id/cur_dot"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:src="@drawable/dot2_w" />
  </FrameLayout>
  <ImageView
    android:id="@+id/open"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_alignParentRight="true"
    android:clickable="true"
    android:src="@drawable/ic_open"
    android:visibility="gone" />
</RelativeLayout>