//为外部提供设置数据源的方法,同时为ViewPager做展示 public void setAdapter(Adapter adapter){ this.adapter = adapter; if (adapter!=null){ init(); } }

上面的代码就是定义了一个接口让外部来设置数据，提供setAdapter来为adapter赋值，同时初始化界面效果，init()方法中就是数据的初始化，代码如下：

private void init() { viewPager.setAdapter(null); carouselLayout.removeAllViews();//清空之前的数据 if (adapter.isEmpty()){ return; } int count = adapter.getCount(); showCount = adapter.getCount(); for (int i=0;i<count;i++){ View view = new View(context); //用来做指示器的View,通过state来做展示效果 if (currentPosition==i){ view.setPressed(true); LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(pageItemWidth + ConvertUtils.dip2px(context,3),pageItemWidth + ConvertUtils.dip2px(context,3)); params.setMargins(pageItemWidth, 0, 0, 0); view.setLayoutParams(params); }else { LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(pageItemWidth,pageItemWidth); params.setMargins(pageItemWidth,0,0,0); view.setLayoutParams(params); } view.setBackgroundResource(R.drawable.carousel_layout_page); carouselLayout.addView(view); } viewPager.setAdapter(new ViewPagerAdapter()); viewPager.setCurrentItem(0); //让手指触碰到的时候自动轮播不起效 this.viewPager.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()){ case MotionEvent.ACTION_DOWN: case MotionEvent.ACTION_MOVE: isUserTouched = true; break; case MotionEvent.ACTION_UP: isUserTouched = false; break; } return false; } }); mTimer.schedule(mTimerTask, 3000, 3000); }

主要的逻辑代码就是这样啦，一个轮播图的控件就做好了。下面来看一下使用：

4、使用

xml中写我们的轮播图控件:

 <com.yangqiangyu.test.carouselview.CarouselView android:layout_width="match_parent" android:layout_height="220dp"> </com.yangqiangyu.test.carouselview.CarouselView>

java代码中获取控件，同时设置接口

 CarouselView carouselView = (CarouselView) findViewById(R.id.CarouselView);
        carouselView.setAdapter(new CarouselView.Adapter() { @Override public boolean isEmpty() { return false; } @Override public View getView(int position) { View view = mInflater.inflate(R.layout.item,null); ImageView imageView = (ImageView) view.findViewById(R.id.image); imageView.setImageResource(mImagesSrc[position]); return view; } @Override public int getCount() { return mImagesSrc.length; } });