Viewpager无限轮播加小圆点

package com.example.wisdom.mylunbo; import android.content.Intent; import android.os.Handler; import android.support.v4.view.ViewPager; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.ImageView; import android.widget.LinearLayout; import java.util.ArrayList; import java.util.List; public class MainActivity extends AppCompatActivity { // String[] urls = BbImages.imgs; // 记录小圆点个数的容器 List<ImageView> dots = new ArrayList<ImageView>(); // List<Integer> list; private List<ImageView> list=new ArrayList<ImageView>();;// 存放要显示在ViewPager对象中的所有Imageview对象 private ViewPager vp; private LinearLayout ll_dot; Handler handler = new Handler() { public void handleMessage(android.os.Message msg) { super.handleMessage(msg); // vp.setCurrentItem(vp.getCurrentItem()+1); int currentItem=vp.getCurrentItem(); currentItem++; vp.setCurrentItem(currentItem); // 发送延迟消息 this.sendEmptyMessageDelayed(0, 2000); } }; private int[] images; private static final int FIRST_PAGE = 1; private int currentPosition; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); vp = (ViewPager) findViewById(R.id.vp); ll_dot = (LinearLayout) findViewById(R.id.ll_dot); images=init(); initdot(); vp.setAdapter(new VPAdapter(images, this, handler)); // handler.sendEmptyMessageDelayed(1, 3000); vp.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageSelected(int postion) { for (int i = 0; i < dots.size(); i++) { ImageView img = dots.get(i); if (i == postion % dots.size()) { img.setImageResource(R.drawable.dot_focus); } else { img.setImageResource(R.drawable.dot_normal); } } } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { } @Override public void onPageScrollStateChanged(int arg0) { } }); vp.setCurrentItem(images.length*1000); handler.sendEmptyMessageDelayed(0, 2000); } private int[] init() { return new int[]{R.drawable.a,R.drawable.b,R.drawable.xiangqing,R.drawable.a,R.drawable.b,R.drawable.xiangqing }; } @Override protected void onStop() { super.onStop(); //移除所有消息和任务 handler.removeCallbacksAndMessages(null); } private void initdot() { for (int i = 0; i < images.length; i++) { ImageView img = new ImageView(this); // 现在空 if (i == 0) { img.setImageResource(R.drawable.dot_focus); } else { img.setImageResource(R.drawable.dot_normal); } LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(20, 20); /** * */ params.setMargins(5, 0, 5, 5); // 加载到布局容器 ll_dot.addView(img, params); dots.add(img); } } }