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ViewPager小圆点无限轮播

2016-06-15 20:01 225 查看

public class MainActivity extends Activity {

   private List<Integer> list;

   private List<ImageView> dots_list;

   private LinearLayout ll;

   private Handler handler;

   private ViewPager vp;

   @Override

   protected void onCreate(Bundle savedInstanceState) {

       super.onCreate(savedInstanceState);

       setContentView(R.layout.activity_main);

       dots_list = new ArrayList<ImageView>();

       vp = (ViewPager) findViewById(R.id.vp);

       ll = (LinearLayout) findViewById(R.id.ll);

       handler = new Handler() {

           @Override

           public void handleMessage(Message msg) {

               // TODO Auto-generated method stub

               super.handleMessage(msg);

               int currentItem = vp.getCurrentItem();

               vp.setCurrentItem(++currentItem);

               handler.sendEmptyMessageDelayed(0x1, 2000);

           }

       };

       initData();

       initDots();

       vp.setOnTouchListener(new OnTouchListener() {

           @Override

           public boolean onTouch(View v, MotionEvent event) {

               // TODO Auto-generated method stub

               switch (event.getAction()) {

               case MotionEvent.ACTION_DOWN:

                   handler.removeCallbacksAndMessages(null);

                   break;

               case MotionEvent.ACTION_UP:

                   handler.sendEmptyMessageDelayed(0x1, 2000);

                   break;

               default:

                   break;

               }

               return false;

           }

       });

       vp.setAdapter(new MyPagerAdapter(this, list));

       vp.setCurrentItem(5000);

       vp.setOnPageChangeListener(new OnPageChangeListener() {

           @Override

           public void onPageSelected(int arg0) {

               // TODO Auto-generated method stub

               for (int i = 0; i < dots_list.size(); i++) {

                   if (i == arg0 % list.size()) {

                       dots_list.get(i)

                               .setImageResource(R.drawable.dots_focus);

                   } else {

                       dots_list.get(i).setImageResource(

                               R.drawable.dots_normal);

                   }

               }

           }

           @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

           }

       });

       // vp.setOnTouchListener(l)

       handler.sendEmptyMessageDelayed(0x1, 2000);

   }

   private void initDots() {

       // TODO Auto-generated method stub

       for (int i = 0; i < list.size(); i++) {

           ImageView iv = new ImageView(this);

           if (i == 0) {

               iv.setImageResource(R.drawable.dots_focus);

           } else {

               iv.setImageResource(R.drawable.dots_normal);

           }

           LayoutParams params = new LayoutParams(18, 18);

           params.setMargins(10, 0, 10, 0);

           ll.addView(iv, params);

           dots_list.add(iv);

       }

   }

   private void initData() {

       list = new ArrayList<Integer>();

       list.add(R.drawable.b);

       list.add(R.drawable.bag);

       list.add(R.drawable.bqz);

       list.add(R.drawable.bt);

   }

}

//适配器：

public class MyPagerAdapter extends PagerAdapter {

   private List<Integer> list;

   private Context context;

   public MyPagerAdapter(Context context, List<Integer> list) {

       super();

       this.list = list;

       this.context = context;

   }

   @Override

   public int getCount() {

       // TODO Auto-generated method stub

       return Integer.MAX_VALUE;

   }

   @Override

   public boolean isViewFromObject(View arg0, Object arg1) {

       // TODO Auto-generated method stub

       return arg0 == arg1;

   }

   @Override

   public Object instantiateItem(ViewGroup
Container, int position) {

       // TODO Auto-generated method stub

       ImageView iv = new ImageView(context);

       iv.setImageResource(list.get(position%list.size()));

       Container.addView(iv);

       return iv;

   }

   @Override

   public void destroyItem(ViewGroup container, int position, Object object) {

       // TODO Auto-generated method stub

       container.removeView((View) object);

   }

}

//小圆点状态选中：

<shape xmlns:Android="http://schemas.Android.com/apk/res/android"
>

    <corners android:radius="5dp" >

    </corners>

    <solid android:color="#0096D6" >

    </solid>

</shape>

//小圆点未选中状态：

<shape xmlns:android="http://schemas.android.com/apk/res/android" >

    <corners android:radius="5dp" >

    </corners>

    <solid android:color="#ffffcc" >

    </solid>

</shape>

//mainactivi布局文件：

<android.support.v4.view.ViewPager

        android:id="@+id/vp"

        android:layout_width="match_parent"

        android:layout_height="250dp" />

    <LinearLayout


4000
      android:id="@+id/ll"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_alignBottom="@id/vp"

        android:gravity="center_horizontal"

        android:orientation="horizontal" >

    </LinearLayout>

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