android引导页

效果图 :

一 , 布局文件

<?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/viewpager"
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent" 
        />    
    
    
    <LinearLayout 
        android:id="@+id/ll" 
        android:orientation="horizontal" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:layout_marginBottom="24.0dip" 
        android:layout_alignParentBottom="true" 
        android:layout_centerHorizontal="true">
        
        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:clickable="true"
            android:padding="15.0dip"
            android:src="@drawable/dot" />

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:clickable="true"
            android:padding="15.0dip"
            android:src="@drawable/dot" />

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:clickable="true"
            android:padding="15.0dip"
            android:src="@drawable/dot" />

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:clickable="true"
            android:padding="15.0dip"
            android:src="@drawable/dot" />

    </LinearLayout>

</RelativeLayout>

 dot.xml:

<?xml version="1.0" encoding="UTF-8"?>  //  dot.xml:
<selector  
  xmlns:android="http://schemas.android.com/apk/res/android">  
    <item android:state_enabled="true" android:drawable="@drawable/dark_dot" />  
    <item android:state_enabled="false" android:drawable="@drawable/white_dot" />  
</selector> 

二 ,下面是activity

public class ViewPagerDemoActivity extends Activity implements OnClickListener, OnPageChangeListener{
    
    private ViewPager vp;
    private ViewPagerAdapter vpAdapter;
    private List<View> views;
    
    //引导图片资源
    private static final int[] pics = { R.drawable.whatsnew_00,
            R.drawable.whatsnew_01, R.drawable.whatsnew_02,
            R.drawable.whatsnew_03 };
    
    //底部小店图片
    private ImageView[] dots ;
    
    //记录当前选中位置
    private int currentIndex;
    
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        views = new ArrayList<View>();
       
        LinearLayout.LayoutParams mParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
                LinearLayout.LayoutParams.WRAP_CONTENT);
        
        //初始化引导图片列表
        for(int i=0; i<pics.length; i++) {
            ImageView iv = new ImageView(this);
            iv.setLayoutParams(mParams);
            iv.setImageResource(pics[i]);
            views.add(iv);
        }
        vp = (ViewPager) findViewById(R.id.viewpager);
        //初始化Adapter
        vpAdapter = new ViewPagerAdapter(views);
        vp.setAdapter(vpAdapter);
        //绑定回调
        vp.setOnPageChangeListener(this);
        
        //初始化底部小点
          initDots();
        
    }
    
    private void initDots() {
        LinearLayout ll = (LinearLayout) findViewById(R.id.ll);

        dots = new ImageView[pics.length];   //顶部的小图片

        //循环取得小点图片
        for (int i = 0; i < pics.length; i++) {
            dots[i] = (ImageView) ll.getChildAt(i);  //findViewbyid  获取小点 ,数组
            dots[i].setEnabled(true);//都设为灰色
            dots[i].setOnClickListener(this);
            dots[i].setTag(i);//设置位置tag，方便取出与当前位置对应
        }

        currentIndex = 0;
        dots[currentIndex].setEnabled(false);//设置为白色，即选中状态
    }
    
    /**
     *设置当前的引导页 
     */
    private void setCurView(int position)
    {
        if (position < 0 || position >= pics.length) {
            return;
        }

        vp.setCurrentItem(position);
    }

    /**
     *这只当前引导小点的选中 
     */
    private void setCurDot(int positon)
    {
        if (positon < 0 || positon > pics.length - 1 || currentIndex == positon) {
            return;
        }

        dots[positon].setEnabled(false);
        dots[currentIndex].setEnabled(true);

        currentIndex = positon;
    }

    //当滑动状态改变时调用
    @Override
    public void onPageScrollStateChanged(int arg0) {
        // TODO Auto-generated method stub
        
    }

    //当当前页面被滑动时调用
    @Override
    public void onPageScrolled(int arg0, float arg1, int arg2) {
        // TODO Auto-generated method stub
        
    }

    //当新的页面被选中时调用
    @Override
    public void onPageSelected(int arg0) {
        //设置底部小点选中状态
        setCurDot(arg0);
    }

    @Override
    public void onClick(View v) {
        int position = (Integer)v.getTag();
        setCurView(position);
        setCurDot(position);
    }
}