android轮播图 简单实现android轮播图

public class BannerViewPager extends FrameLayout {

 private ViewPager viewPager;
 private TextView tvTitle;
 private LinearLayout indicatorGroup;
 private BannerAdapter adapter;
 private List<String> titles;//标题集合
 private List imageUrls;//图片数据
 private List<View> views;//轮播图显示
 private ImageView [] tips;//保存显示的小圆点
 private int count;//保存imageUrls的总数
 private int bannerTime=2500;//轮播图的间隔时间
 private int currentItem=0;//轮播图的当前选中项
 private long releaseTime = 0;//保存触发时手动滑动的时间 进行判断防止滑动之后立即轮播
 private final int START=10;
 private final int STOP=20;
 private Context context;
 private Handler handler;

 private final Runnable runnable=new Runnable() {
  @Override
  public void run() {
   long now=System.currentTimeMillis();
   if (now-releaseTime>bannerTime-500){
    handler.sendEmptyMessage(START);
   }else{
    handler.sendEmptyMessage(STOP);
   }
  }
 };


 public BannerViewPager(Context context) {
  super(context);
 }

 public BannerViewPager(Context context, AttributeSet attrs) {
  super(context, attrs);
  this.context=context;
  titles=new ArrayList<>();
  titles.add("标题1");
  titles.add("标题2");
  titles.add("标题3");
  imageUrls=new ArrayList();
  views=new ArrayList<>();
  init(context,attrs);
 }


 private void init(final Context context, AttributeSet attrs){
  View view= LayoutInflater.from(context).inflate(R.layout.layout_banner,this);
  viewPager= (ViewPager) view.findViewById(R.id.banner_view_pager);
  tvTitle= (TextView) view.findViewById(R.id.banner_title);
  indicatorGroup= (LinearLayout) view.findViewById(R.id.banner_indicator);
  handler=new Handler(){
   @Override
   public void handleMessage(Message msg) {
    super.handleMessage(msg);
    switch (msg.what){
     case START:
      viewPager.setCurrentItem(currentItem+1);
      handler.removeCallbacks(runnable);
      handler.postDelayed(runnable,bannerTime);
      break;
     case STOP:
      releaseTime=0;
      handler.removeCallbacks(runnable);
      handler.postDelayed(runnable,bannerTime);
      break;
    }
   }
  };
 }

 /**
  * 初始化数据 以及拿到数据后的各种设置
  * 可以是网络地址 也可是项目图片数据
  * @param imageUrls
  */
 public void setData(List<?> imageUrls){
  this.imageUrls.clear();
  this.count=imageUrls.size();
  this.imageUrls.add(imageUrls.get(count-1));
  this.imageUrls.addAll(imageUrls);
  this.imageUrls.add(imageUrls.get(0));

  initIndicator();
  getShowView();
  setUI();
 }

 /**
  * 设置标题
  * @param titles
  */
 public void setTitles(List<String> titles){
  this.titles.clear();
  this.titles.addAll(titles);
 }
 /**
  * 设置小圆点指示器
  */
 private void initIndicator(){
  tips=new ImageView[count];
  LinearLayout.LayoutParams layoutParams = new LinearLayout.
    LayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
  layoutParams.height=10;
  layoutParams.width=10;
  layoutParams.leftMargin = 5;// 设置点点点view的左边距
  layoutParams.rightMargin = 5;// 设置点点点view的右边距
  for (int i=0;i<count;i++){
   ImageView imageView=new ImageView(context);
   if (i == 0) {
    imageView.setBackgroundResource(R.drawable.shape_circle_red);
   } else {
    imageView.setBackgroundResource(R.drawable.shape_circle_white);
   }

   tips[i] = imageView;
   indicatorGroup.addView(imageView, layoutParams);
  }
 }

 /**
  * 获取显示图片view
  */
 private void getShowView(){
  for (int i=0;i<imageUrls.size();i++){
   ImageView imageView=new ImageView(context);
   imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
   if (imageUrls.get(i) instanceof String){

   }else{
    imageView.setImageResource((Integer) imageUrls.get(i));
   }
   views.add(imageView);
  }
 }

 /**
  * 设置UI
  */
 private void setUI(){
  adapter=new BannerAdapter();
  viewPager.setAdapter(adapter);
  viewPager.addOnPageChangeListener(onPageChangeLis);
  viewPager.setCurrentItem(1);
  handler.postDelayed(runnable,bannerTime);
 }

 /**
  * viewPage改变监听
  */
 private ViewPager.OnPageChangeListener onPageChangeLis=new ViewPager.OnPageChangeListener() {
  @Override
  public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

  }

  @Override
  public void onPageSelected(int position) {
   //计算当前页的下标
   int max = views.size() - 1;
   int temp = position;
   currentItem = position;
   if (position == 0) {
    currentItem = max - 1;
   } else if (position == max) {
    currentItem = 1;
   }
   temp = currentItem - 1;
   setIndicatorAndTitle(temp);
  }

  @Override
  public void onPageScrollStateChanged(int state) {
   currentItem=viewPager.getCurrentItem();
   switch (state) {
    case 0:
     //Log.e("aaa","=====静止状态======");
     if (currentItem == 0) {
      viewPager.setCurrentItem(count, false);
     } else if (currentItem == count + 1) {
      viewPager.setCurrentItem(1, false);
     }
     break;
    case 1:
//    Log.e("aaa","=======手动拖拽滑动时调用====");
     releaseTime = System.currentTimeMillis();
     if (currentItem == count + 1) {
      viewPager.setCurrentItem(1, false);
     } else if (currentItem == 0) {
      viewPager.setCurrentItem(count, false);
     }
     break;
    case 2:
//    Log.e("aaa","=======自动滑动时调用====");
     break;
   }
  }
 };


 /**
  * 设置指示器和标题切换
  * @param position
  */
 private void setIndicatorAndTitle(int position){
  tvTitle.setText(titles.get(position));

  for (int i=0;i<tips.length;i++){
   if (i==position){
    tips[i].setBackgroundResource(R.drawable.shape_circle_red);
   }else{
    tips[i].setBackgroundResource(R.drawable.shape_circle_white);
   }
  }
 }

 /**
  * 适配器
  */
 class BannerAdapter extends PagerAdapter{
  @Override
  public int getCount() {
   return views.size();
  }

  @Override
  public boolean isViewFromObject(View view, Object object) {
   return view==object;
  }

  @Override
  public Object instantiateItem(ViewGroup container, int position) {
   container.addView(views.get(position));
   return views.get(position);
  }

  @Override
  public void destroyItem(ViewGroup container, int position, Object object) {
   container.removeView((View) object);
  }
 }
}

BannerViewPager banner= (BannerViewPager) findViewById(R.id.banner);
  List<Integer> imageUrl=new ArrayList<>();
  imageUrl.add(R.mipmap.aiyo);
  imageUrl.add(R.mipmap.dipang1);
  imageUrl.add(R.mipmap.ic_launcher);
  banner.setData(imageUrl);