ViewPager无线轮播加小圆点

MainActivity

package com.example.roolimage;

import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;

public class MainActivity extends Activity {

   private LinearLayout ll_dots;
   private ViewPager viewPager;

   private String[] imageUrls = new String[] {
           "http://172.25.112.1:8080/ab.jpg",
           "http://172.25.112.1:8080/ae.jpg",
           "http://172.25.112.1:8080/af.jpg",
           "http://172.25.112.1:8080/ah.jpg" };

   private ArrayList<ImageView> dotsList;
   Handler handler = new Handler() {
       public void handleMessage(android.os.Message msg) {
           if (msg.what == 0) {
               // 先获取当前页码值
               int currentItem = viewPager.getCurrentItem();
               // 设置条目页码加加
               currentItem++;
               viewPager.setCurrentItem(currentItem);
               // 再发送消息
               move();
           }
       };
   };

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       viewPager = (ViewPager) findViewById(R.id.viewPager);
       ll_dots = (LinearLayout) findViewById(R.id.ll_dots);
       // 设置viewPager的数据适配器
       viewPager.setAdapter(new MyPagerAdapter(this, imageUrls, handler));
       // 设置当前的页码
       viewPager.setCurrentItem(10000000);
       initDots();
       viewPager.setOnPageChangeListener(new OnPageChangeListener() {
           @Override
           public void onPageSelected(int position) {
               for (int i = 0; i < dotsList.size(); i++) {
                   if (position % imageUrls.length == i) {
                       dotsList.get(i).setImageDrawable(
                               getResources().getDrawable(
                                       R.drawable.dots_focused));
                   } else {
                       dotsList.get(i).setImageDrawable(
                               getResources().getDrawable(
                                       R.drawable.dots_normal));
                   }
               }
           }

           @Override
           public void onPageScrolled(int arg0, float arg1, int arg2) {
           }

           @Override
           public void onPageScrollStateChanged(int arg0) {
           }
       });
       // 先执行发送消息
       move();
   }

   public void move() {
       handler.sendEmptyMessageDelayed(0, 2000);
   }

   // 初始化小点
   private void initDots() {
       dotsList = new ArrayList<ImageView>();
       ll_dots.removeAllViews();
       dotsList.clear();
       for (int i = 0; i < imageUrls.length; i++) {
           ImageView imageView = new ImageView(this);
           // 加小点
           if (i == 0) {
               // 默认就是一个亮的小点
               imageView.setImageDrawable(getResources().getDrawable(
                       R.drawable.dots_focused));
           } else {
               imageView.setImageDrawable(getResources().getDrawable(
                       R.drawable.dots_normal));
           }
           // 设置小点的宽高 dp---dip
           LayoutParams params = new LayoutParams(20, 20);
           // 将imageView添加到线性布局里边
           // 设置边距
           params.setMargins(5, 0, 5, 0);
           ll_dots.addView(imageView, params);
           // 将小点添加到集合中
           dotsList.add(imageView);
       }
   }

}

适配器

package com.example.roolimage;

import android.content.Context;
import android.os.Handler;
import android.support.v4.view.PagerAdapter;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.widget.ImageView;

import com.lidroid.xutils.BitmapUtils;

public class MyPagerAdapter extends PagerAdapter {
   protected static final String TAG = "MyPagerAdapter";
   private String[] imageUrls;
   private Context context;
   private Handler handler;

   public MyPagerAdapter(Context context, String[] imageUrls, Handler handler) {
       this.context = context;
       this.imageUrls = imageUrls;
       this.handler = handler;
   }

   @Override
   public int getCount() {
       return Integer.MAX_VALUE;
   }
   @Override
   public boolean isViewFromObject(View arg0, Object arg1) {
       return arg0 == arg1;
   }
   @Override
   public Object instantiateItem(ViewGroup container, int position) {
       ImageView imageView = new ImageView(context);
       imageView.setOnTouchListener(new OnTouchListener() {

           @Override
           public boolean onTouch(View v, MotionEvent event) {
               switch (event.getAction()) {
               // 按下
               case MotionEvent.ACTION_DOWN:
                   // 移除所有消息和任务
                   handler.removeCallbacksAndMessages(null);
                   Log.i(TAG, "down......");
                   break;
               // 手指抬起
               case MotionEvent.ACTION_UP:
                   handler.sendEmptyMessageDelayed(0, 2000);
                   Log.i(TAG, "up......");
                   break;
               // 取消触摸事件
               case MotionEvent.ACTION_CANCEL:
                   Log.i(TAG, "cancel......");
                   handler.sendEmptyMessageDelayed(0, 2000);
                   break;
               default:
                   break;
               }
               // 是否消费该事件事件的传递机制
               return true;
           }
       });
       BitmapUtils bitmapUtils = new BitmapUtils(context);
       bitmapUtils.display(imageView, imageUrls[position % imageUrls.length]);
       container.addView(imageView);
       return imageView;
   }

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

//布局

//选择器

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >
    <corners android:radius="8dp"/>
    <solid android:color="#99ffff"/>

</shape>

秒客网

ViewPager无线轮播加小圆点

相关文章