Android实现viewpager实现循环轮播效果

/**
 * viewpager切换页面时动画
 */
public class MainActivity extends AppCompatActivity {

  private ViewPager viewPager;
  private ViewPaagerAdapter adapter;
  private ArrayList<View> viewlist=new ArrayList<>();//承载图片
  private ArrayList<TextView> tvList=new ArrayList<>();//底部圆点集合
  private int []imgList={R.drawable.img8,R.drawable.img1,R.drawable.img2,R.drawable.img3,R.drawable.img4,R.drawable.img5,
      R.drawable.img6, R.drawable.img7,R.drawable.img8,R.drawable.img1};//图片数组
  boolean isStop=false;
  private LinearLayout line;//小圆圈父视图
  private ScheduledThreadPoolExecutor executor;

  private int currentPage;
  private Handler handler=new Handler(){
    @Override
    public void handleMessage(Message msg) {
      super.handleMessage(msg);
      switch (msg.what) {
        case 1:
          viewPager.setCurrentItem(msg.arg1);
          break;

        default:
          break;
      }
    }
  };

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.activity_main);
    viewPager= (ViewPager) findViewById(mybanner_viewpager);
    line= (LinearLayout) findViewById(R.id.line);
    setView();//设置轮播显示的底图
    adapter=new ViewPaagerAdapter(this,viewlist);
    viewPager.setAdapter(adapter);
    viewPager.setCurrentItem(1);
    viewPager.setOffscreenPageLimit(10);//加这个是为了防止第一张往左滑动会出现闪烁


    startService();//启动轮播

    viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
      @Override
      public void onPageScrolled(final int position, float positionOffset, int positionOffsetPixels) {
        Log.i("tag","位置"+position+"positionOffset"+positionOffset+"positionOffsetPixels"+positionOffsetPixels);
        Log.i("tag","weizhi"+viewPager.getCurrentItem());
        if (position==imgList.length-1) {
          viewPager.setCurrentItem(1,false);

        }else if(viewPager.getCurrentItem()==0&& positionOffsetPixels==0) {
          viewPager.setCurrentItem(imgList.length-2, false);

        }
        currentPage=viewPager.getCurrentItem();
      }

      @Override
      public void onPageSelected(final int position) {
        Log.i("tag","位置wwwww"+position);
        setEnbale();
        if (position==imgList.length-1) {
          tvList.get(0).setEnabled(true);
        }
        else if (position==0) {
          tvList.get(imgList.length-3).setEnabled(true);
        }
        else{
          tvList.get(position-1).setEnabled(true);

        }


      }

      @Override
      public void onPageScrollStateChanged(int state) {


      }
    });


  }


  public void setView() {
    LinearLayout.LayoutParams params=new LinearLayout.LayoutParams(15,15);
    params.leftMargin=10;
    params.rightMargin=10;
    for (int i = 0; i < imgList.length; i++) {
      View view= LayoutInflater.from(this).inflate(R.layout.layout,null,false);

      ImageView img= (ImageView) view.findViewById(R.id.img);
      img.setBackgroundResource(imgList[i]);
      TextView textView= (TextView) view.findViewById(R.id.tv);
      textView.setText(i+"");
      viewlist.add(view);
    }
    for (int i = 0; i < imgList.length-2; i++) {
      TextView view=new TextView(this);
      view.setBackgroundResource(R.drawable.item);


      view.setLayoutParams(params);
      view.setEnabled(false);

      line.addView(view);
      tvList.add(view);

    }
    tvList.get(0).setEnabled(true);

  }

  public void setEnbale(){
    for (TextView tvcycle: tvList) {
      tvcycle.setEnabled(false);
    }
  }

  /**
   * 启动线程池开启循环任务
   */
  public void startService(){
    executor=new ScheduledThreadPoolExecutor(1);
    executor.scheduleWithFixedDelay(runnable,1,2, TimeUnit.SECONDS);

  }

  /**
   * 停止任务
   */
  public void stopService(){
    executor.shutdown();
  }

  Runnable runnable=new Runnable() {
    @Override
    public void run() {

      currentPage=currentPage+1%10;
      Message message= Message.obtain();
      message.what=1;
      message.arg1=currentPage;
      handler.sendMessage(message);



    }
  };

  @Override
  protected void onDestroy() {
    super.onDestroy();
    stopService();

  }
}

 if (position==imgList.length-1) {
          viewPager.setCurrentItem(1,false);

        }else if(viewPager.getCurrentItem()==0&& positionOffsetPixels==0) {
          viewPager.setCurrentItem(imgList.length-2, false);

        }