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>