viewpager无限轮播加点

来源：互联网发布：js删除指定class的div 编辑：程序博客网时间：2024/05/17 06:54

//首先在Xml中画点画两个颜色不一样的点在drawable文件夹下

//第二个点

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
       android:shape="oval">

    <solid android:color="@android:color/holo_green_dark"></solid>

    <size android:height="10dp" android:width="10dp"/>

</shape>

代码

public class MainActivity extends Activity {

   private static final int W = 0;
   private ViewPager vp;
   private int[] image={R.drawable.a,R.drawable.b,R.drawable.c};
   private Button button;
   private LinearLayout ll;
    List<ImageView> imageiv=new ArrayList<ImageView>();
   //无限轮播的handler 接收msg
    private Handler handler =new Handler(){
       public void handleMessage(android.os.Message msg) {
           if(msg.what==W)
           {
               int currentItem = vp.getCurrentItem();
               currentItem++;
               vp.setCurrentItem(currentItem);
           }
       };
    };

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       //找控件
       vp = (ViewPager) findViewById(R.id.vp);
       button = (Button) findViewById(R.id.button);
       ll = (LinearLayout) findViewById(R.id.ll);
       vp.setAdapter(new MyAdapter());
       vp.setCurrentItem(10000*image.length);
       //代用加点的方法
       intiDian();
       button.setOnClickListener(new OnClickListener() {

           @Override
           public void onClick(View v) {
               // TODO Auto-generated method stub

           }
       });
       //在Viewpager的点击事件中让点变化
       vp.setOnPageChangeListener(new OnPageChangeListener() {

           @Override
           public void onPageSelected(int position) {
               // TODO Auto-generated method stub
               if(position%image.length==2)
               {
                   button.setVisibility(View.VISIBLE);
               }
               else
               {
                   button.setVisibility(View.INVISIBLE);
               }

               for (int i = 0; i <=imageiv.size()-1; i++) {


                   if(i==position%image.length)
                   {

                       imageiv.get(i).setImageResource(R.drawable.write);

                   }
                   else
                   {
                       imageiv.get(i).setImageResource(R.drawable.red);
                   }
               }
               }

           @Override
           public void onPageScrolled(int arg0, float arg1, int arg2) {
               // TODO Auto-generated method stub
           }

           @Override
           public void onPageScrollStateChanged(int arg0) {
               // TODO Auto-generated method stub

           }
       });

       //viewpager的自动轮播
       handler.sendEmptyMessageDelayed(W, 2000);
   }

   //添加点的方法
   private void intiDian() {


       for (int i = 0; i < image.length; i++) {
           ImageView iv = new ImageView(MainActivity.this);
           if(i==0)
           {
               //在Xml中画点
               iv.setImageResource(R.drawable.write);
           }
           else
           {
               iv.setImageResource(R.drawable.red);

           }

           LayoutParams params=new LayoutParams(20, 20);
           params.setMargins(15, 0, 15, 0);
           ll.addView(iv,params);
           imageiv.add(iv);
       }
   }
   class MyAdapter extends PagerAdapter{

       private View view;
       @Override
       public int getCount() {
           // TODO Auto-generated method stub
           //viewpager的无限轮播
           return Integer.MAX_VALUE;
       }

       @Override
       public boolean isViewFromObject(View arg0, Object arg1) {
           // TODO Auto-generated method stub
           return arg0==arg1;
       }
       @Override
       public void destroyItem(ViewGroup container, int position, Object object) {
           // TODO Auto-generated method stub
           container.removeView((View) object);
       }

       @Override
       public Object instantiateItem(ViewGroup container, int position) {
           // TODO Auto-generated method stub
           view = LayoutInflater.from(MainActivity.this).inflate(R.layout.vp_item, null);
           ImageView iv = (ImageView) view.findViewById(R.id.iv);

           //修改position 实现无限轮播
           iv.setImageResource(image[position%image.length]);
           container.addView(view);
           return view;
       }
   }

}

阅读全文

0 0