(转)首页广告

  一、布局设置

使用ViewPager来设置主广告，这样既可左右滑动切换

2、滑动切换的时候需要设置一个OnPageChangeListener监听器，当广告切换的时候，利用监听器设置圆点的实心和空心。

public void onPageSelected(int position) {
			currentItem = position;
			tv_title.setText(titles[position]);
			//第几个选中的圆点实心
			dots.get(oldPosition).setBackgroundResource(R.drawable.dot_normal);
			dots.get(position).setBackgroundResource(R.drawable.dot_focused);
			oldPosition = position;
		}

 3、设置pagerAdapter

/**
	 * 填充ViewPager页面的适配器
	 * 
	 * @author Administrator
	 * 
	 */
	private class MyAdapter extends PagerAdapter {


		@Override
		public int getCount() {
			return imageResId.length;
		}

		@Override
		public Object instantiateItem(View arg0, int arg1) {
			System.out.println("shilihua...");
			((ViewPager) arg0).addView(imageViews.get(arg1));
			return imageViews.get(arg1);
		}

		@Override
		public void destroyItem(View arg0, int arg1, Object arg2) {
			System.out.println("destroyItem....");
			((ViewPager) arg0).removeView((View) arg2);
		}

		@Override
		//考虑成arg0 为viewPager加载的内容，arg1为instaitateItem返回的View
		public boolean isViewFromObject(View arg0, Object arg1) {
			boolean b=arg0 == arg1;
			System.out.println("check...."+b);
			return arg0 == arg1;
		}

		@Override
		public void restoreState(Parcelable arg0, ClassLoader arg1) {

		}
		@Override
		public int getItemPosition(Object object) {
			// TODO Auto-generated method stub
			//需要刷新用这个？
			return POSITION_NONE;
		}

		@Override
		public Parcelable saveState() {
			return null;
		}
/*
 * 每当页面发生变化的时候startUpdate...  instant  destory check  finishUpdate..
 * 参考：http://www.jishuziyuan.com/archive/Kaiewii/7821846.html
 * */
		@Override
		public void startUpdate(View arg0) {
				System.out.println("startUpdate");
		}

		@Override
		public void finishUpdate(View arg0) {
			System.out.println("finishUpdate");

		}
	
	}
}

4、自动滚动，设置一个定时器

ScheduledExecutorService scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
		// 当Activity显示出来后，每两秒钟切换一次图片显示
		scheduledExecutorService.scheduleAtFixedRate(new ScrollTask(), 1, 2, TimeUnit.SECONDS);

	/**
	 * 换行切换任务
	 * 
	 * @author Administrator
	 * 
	 */
	private class ScrollTask implements Runnable {

		public void run() {
			synchronized (viewPager) {
				System.out.println("currentItem: " + currentItem);
				currentItem = (currentItem + 1) % imageViews.size();
				handler.obtainMessage().sendToTarget(); // 通过Handler切换图片
			}
		}

	}

	// 切换当前显示的图片
	private Handler handler = new Handler() {
		public void handleMessage(android.os.Message msg) {
			viewPager.setCurrentItem(currentItem);// 切换当前显示的图片
		};
	};