实现轮转广告带底部指示的自定义ViewPager控件

public class ViewPagerAdapter extends PagerAdapter {

    private List views = null;
    private ScaleType scaleType;

    public ViewPagerAdapter(List views) {
        this(views, ScaleType.CENTER);
    }

    public ViewPagerAdapter(List views, ScaleType scaleType) {
        super();
        this.views = views;
        this.scaleType = scaleType;
    }

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return views.size();
}

@Override
public boolean isViewFromObject(View arg0, Object arg1) {
    // TODO Auto-generated method stub
    return arg0 == arg1;
}

@Override
public Object instantiateItem(View container, int position) {
    // TODO Auto-generated method stub
    View view = views.get(position);
    ViewPager viewPager = (ViewPager) container;
    if (view instanceof ImageView){
        ((ImageView) view).setScaleType(scaleType);
    }
    viewPager.addView(view, 0);
    return view;
}

@Override
public void destroyItem(View container, int position, Object object) {
    // TODO Auto-generated method stub
    ((ViewPager) container).removeView((View) object);
}

public class MyViewPager extends LinearLayout implements Runnable {

    private ViewPager viewPager;
    private LinearLayout viewDots;
    private List dots;
    private List views;

    private int position = 0;
    private boolean isCOntinue= true;

    private float dotsViewHeight;
    private float dotsSpacing;
    private Drawable dotsFocusImage;
    private Drawable dotsBlurImage;
    private ScaleType scaleType;
    private int gravity;
    private Drawable dotsBackground;
    private float dotsBgAlpha;
    private int changeInterval;

public MyViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
    // TODO Auto-generated constructor stub
    TypedArray a = context.obtainStyledAttributes(attrs,
            R.styleable.MyViewPager, 0, 0);

try {
        dotsViewHeight = a.getDimension(
                    R.styleable.MyViewPager_dotsViewHeight, 40);
            //这里依次获取所有的属性值，此处省略，可参看最后附上的全部代码
        } finally {
            a.recycle();
        }

    initView();
}

@SuppressLint("NewApi")
private void initView() {
    // TODO Auto-generated method stub
    viewPager = new ViewPager(getContext());
    viewDots = new LinearLayout(getContext());

    LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT,
            LayoutParams.MATCH_PARENT);
    addView(viewPager, lp);
    if (dotsBackground != null) {
        dotsBackground.setAlpha((int) (dotsBgAlpha * 255));
        viewDots.setBackground(dotsBackground);
    }
    viewDots.setGravity(gravity);
    addView(viewDots, lp);
}

public void setViewPagerViews(List views) {
    this.views = views;
    addDots(views.size());

    viewPager.setAdapter(new ViewPagerAdapter(views, scaleType));

    viewPager.setOnPageChangeListener(new OnPageChangeListener() {
        @Override
        public void onPageSelected(int index) {
            // TODO Auto-generated method stub
            position = index;
            switchToDot(index);
        }
        //override的两个空方法，此处省略
    });

    viewPager.setOnTouchListener(new OnTouchListener() {

        @Override
        public boolean onTouch(View view, MotionEvent motionevent) {
            // TODO Auto-generated method stub
            switch (motionevent.getAction()) {
            case MotionEvent.ACTION_DOWN:
            case MotionEvent.ACTION_MOVE:
                isCOntinue= false;
                break;
            case MotionEvent.ACTION_UP:
                isCOntinue= true;
                break;
            default:
                isCOntinue= true;
                break;
            }
            return false;
        }
    });
    new Thread(this).start();
}

@Override
public void run() {
    // TODO Auto-generated method stub
    while (true) {
        if (isContinue) {
            pageHandler.sendEmptyMessage(position);
            position = (position + 1) % views.size();
            try {
                Thread.sleep(changeInterval);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}

Handler pageHandler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        // TODO Auto-generated method stub
        viewPager.setCurrentItem(msg.what);
        super.handleMessage(msg);
    }
};

@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
    // TODO Auto-generated method stub
    View child = this.getChildAt(0);
    child.layout(0, 0, getWidth(), getHeight());

    if (changed) {
        child = this.getChildAt(1);
        child.measure(r - l, (int) dotsViewHeight);
        child.layout(0, getHeight() - (int) dotsViewHeight, getWidth(),
                getHeight());
    }
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    initViewPager();
}

private void initViewPager() {
    views = new ArrayList();

    ImageView image = new ImageView(this);
    image.setImageResource(R.drawable.demo_scroll_image);
    views.add(image);
    image = new ImageView(this);
    image.setImageResource(R.drawable.demo_scroll_image2);
    views.add(image);
    image = new ImageView(this);
    image.setImageResource(R.drawable.demo_coupon_image);
    views.add(image);
    image = new ImageView(this);
    image.setImageResource(R.drawable.demo_scroll_image2);
    views.add(image);

    MyViewPager pager = (MyViewPager) findViewById(R.id.my_view_pager);
    pager.setViewPagerViews(views);
}