1、具體步驟

     說下大概實現步驟，一般我們有兩種，一種是viewpager+作為遊標的點 。另外一種是重寫viewpager。

       效果圖： 

1.1 佈局，直接viewpager+一個viewgroup就好。

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.maxence.viewpager.MainActivity" >
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="220dp" >
        <android.support.v4.view.ViewPager
            android:id="@+id/vp_pager"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
        
        	<!-- 作為viewgroup 動態  add 遊標 -->
        	<LinearLayout
        	    android:id="@+id/ll_container"
        	    android:layout_width="match_parent"
        	    android:layout_height="30dp"
        	    android:gravity="center"
        	    android:orientation="horizontal"
        	    android:layout_alignParentBottom="true"
        	    ></LinearLayout>
    </RelativeLayout>
</RelativeLayout>
 

 1.2 動態add的點，常規白點：point_normal.xml。

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" 
     android:shape="oval">
    <stroke
        android:width="1dip"
        android:color="#ffffff"/>
    <solid android:color="#ffffff" />
</shape>
 

   選中為紅點： point_select.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" 
    android:shape="oval">
    <stroke 
        android:width="1dp"
        android:color="#ff0000"
        />
    <solid android:color="#ff0000"/>
</shape>
 

1.3動態新增進去圖片和遊標點。

        /**
	 * 初始化資料
	 */
	private void initData() {
		mContext = this;
		int[] i = new int[] { R.drawable.bg_lunbo1, R.drawable.bg_lunbo2, R.drawable.bg_lunbo3, R.drawable.bg_lunbo4 };
		al = new ArrayList<ImageView>();
		for (int x = 0; x < i.length; x++) {
			ImageView iv = new ImageView(mContext);
			iv.setBackgroundResource(i[x]);
			al.add(iv);
			View v=new View(mContext);
			v.setBackgroundResource(R.drawable.point_normal);
			//有多少張圖就放置幾個點
			LayoutParams layoutParams = new LinearLayout.LayoutParams(15, 15);  
                        layoutParams.leftMargin = 30;  
			ll_container.addView(v,layoutParams);
		}
		vp_pager.setAdapter(new Myadapter());
		vp_pager.setOnPageChangeListener(this);
		vp_pager.setCurrentItem(al.size()*1000);  //這個是無線輪詢的關鍵
		ll_container.getChildAt(0).setBackgroundResource(R.drawable.point_select);
		prePosition=0;
	}

1.4 viewpgaer繫結PagerAdapter,這樣就能滑動照片並且無限滑了。

class Myadapter extends PagerAdapter {
		@Override
		public int getCount() {
			return Integer.MAX_VALUE; // 要無限輪播
		}
		@Override
		public boolean isViewFromObject(View arg0, Object arg1) {
			return arg0 == arg1;
		}
		@Override
		public Object instantiateItem(ViewGroup container, int position) {
				int position1=position % al.size();		
				ImageView imageView = al.get(position1);
				container.addView(imageView);
				return imageView;
		}
		@Override
		public void destroyItem(ViewGroup container, int position, Object object) {
			container.removeView((View)object);
		}
	}

1.5 實現遊標，就是滑動圖片，下面的紅點也跟著變化。

vp_pager.setOnPageChangeListener(this);

	@Override
	public void onPageScrollStateChanged(int arg0) {
	}

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

	@Override
	public void onPageSelected(int position) {
		  int newPosition = position % al.size();  
		  ll_container.getChildAt(newPosition).setBackgroundResource(R.drawable.point_select);
		  ll_container.getChildAt(prePosition).setBackgroundResource(R.drawable.point_normal);
		  prePosition=newPosition;
	}

1.6實現自動輪詢。開啟一個執行緒即可。

        /**
	 * 自動輪詢
	 */
	private void pollint() {
	  pThread = new PollThread();
	  pThread.start();
	}

	class PollThread extends Thread{
		@Override
		public void run() {
			while (poll){
				
				try {
					Thread.sleep(2000);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
				runOnUiThread(new Runnable() {
					@Override
					public void run() {
							vp_pager.setCurrentItem(vp_pager.getCurrentItem()+1);
					}
				});
				
			}
		}
	}

這樣就搞定了，僅僅提供一個思路。自己可以擴充套件，例如重寫viewpager，把功能封裝在內部即可。

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