ViewPager做的轮播图

一activity

package com.example.MyViewPaper;

import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.TextView;

public class MainActivity extends Activity {
	private ViewPager vp_img;
	private TextView tv_des;
	private LinearLayout ll_point;
	private int[] imgIds;
	private ArrayList<ImageView> imgList;
	private ImageView imageView;
	private ArrayList<View> pointList;
	private String[] desStrs;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		initUI();
		initData();
		initAdapterAndListener();
	}

	/**
	 * 初始化适配器,监听器
	 */
	private void initAdapterAndListener() {
		ll_point.getChildAt(0).setEnabled(true);
		myAdapter myAdapter = new myAdapter();
		vp_img.setAdapter(myAdapter);
		vp_img.setCurrentItem(Integer.MAX_VALUE / 2 - Integer.MAX_VALUE / 2 % 5);
		vp_img.setOnPageChangeListener(new OnPageChangeListener() {

			@Override
			public void onPageSelected(int oldPosition) {
				int position = oldPosition % 5;
				tv_des.setText(desStrs[position]);

				int childCount = ll_point.getChildCount();
				for (int i = 0; i < childCount; i++) {
					View childAt = ll_point.getChildAt(i);
					if (i != position) {
						childAt.setEnabled(false);
					} else {
						childAt.setEnabled(true);
					}
				}

			}

			@Override
			public void onPageScrolled(int position, float positionOffset,
					int positionOffsetPixels) {
				// TODO Auto-generated method stub

			}

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

			}
		});
	}

	/**
	 * 初始化显示数据
	 */
	private void initData() {
		// 图片ID数组
		imgIds = new int[] { R.drawable.a, R.drawable.b, R.drawable.c,
				R.drawable.d, R.drawable.e };
		desStrs = new String[] { "巩俐不低俗，我就不能低俗", "扑树又回来啦！再唱经典老歌引万人大合唱",
				"揭秘北京电影如何升级", "乐视网TV版大派送", "热血屌丝的反杀" };
		// 存放图片控件的集合
		imgList = new ArrayList<ImageView>();
		View pointView = null;
		for (int id : imgIds) {
			// 设置图片集合
			imageView = new ImageView(getApplicationContext());
			imageView.setBackgroundResource(id);
			imgList.add(imageView);
			// 加入小白点
			pointView = new View(this);
			pointView.setBackgroundResource(R.drawable.selector_bg_point);
			// 小白点布局
			LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(5,
					5);
			if (id != 0) {
				params.leftMargin = 10;
			}
			pointView.setEnabled(false);
			// 小白点加入布局
			ll_point.addView(pointView, params);
		}
	}

	/**
	 * 找到控件
	 */
	private void initUI() {
		vp_img = (ViewPager) findViewById(R.id.vp_img);
		tv_des = (TextView) findViewById(R.id.tv_des);
		ll_point = (LinearLayout) findViewById(R.id.ll_point);
	}

	private class myAdapter extends PagerAdapter {

		@Override
		public int getCount() {
			// TODO Auto-generated method stub
			return Integer.MAX_VALUE;
		}

		@Override
		public boolean isViewFromObject(View view, Object object) {
			// TODO Auto-generated method stub
			return view == object;
		}

		@Override
		public Object instantiateItem(ViewGroup container, int position) {
			ImageView imageView = imgList.get(position%5);
			container.addView(imageView);
			return imageView;
		}

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

	}
}

二布局文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:background="#fcc"
    android:layout_height="match_parent"
    tools:context="${relativePackage}.${activityClass}" >

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="200dp" >

        <android.support.v4.view.ViewPager
            android:id="@+id/vp_img"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/a" />

        <View
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:layout_alignParentBottom="true"
            android:background="#66000000" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:layout_alignParentBottom="true"
            android:orientation="vertical"
            android:gravity="center" >

            <TextView
                android:id="@+id/tv_des"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:singleLine="true"
                android:textColor="@android:color/white"
                android:text="呵呵哒先生,呵呵哒先生,呵呵哒先生,呵呵哒先生,呵呵哒先生,呵呵哒先生,呵呵哒先生,呵呵哒先生,呵呵哒先生,呵呵哒先生,呵呵哒先生,呵呵哒先生,呵呵哒先生,呵呵哒先生,呵呵哒先生,呵呵哒先生,呵呵哒先生" />

            <LinearLayout
                android:id="@+id/ll_point"
                android:padding="5dp"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:orientation="horizontal" >
            </LinearLayout>
        </LinearLayout>
    </RelativeLayout>

</RelativeLayout>

三：图片选择器

selector_bg_point.xml

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

    <item android:drawable="@drawable/shape_bg_point_enable" android:state_enabled="true"/>
    <item android:drawable="@drawable/shape_bg_point_disable" android:state_enabled="false"/>

</selector>

shape_bg_point_disable.xml

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

    <corners android:radius="5dp" />

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

</shape>

shape_bg_point_enable.xml

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

    <corners android:radius="5dp" />

    <solid android:color="#FFFFFF" />

</shape>