ViewPaper实现轮播广告条

使用V4包中的viewPaper组件自定义轮播广告条效果。

实现viewpaper的滑动切换和定时自动切换效果。

上效果图

布局文件

还有一个selector

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android=""><item android:drawable="@drawable/indicators_now" android:state_enabled="true"></item><item android:drawable="@drawable/indicators_default" android:state_enabled="false"></item></selector>

class文件

package com.example.viewpaperdemo;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;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.TextView;public class MainActivity extends Activity { private ViewPager viewpaper; private TextView tv_imageDesc; private LinearLayout ll_pointGroup; private List<ImageView> imageList; // 图片资源ID private final int[] imageIds = { R.drawable.a, R.drawable.b, R.drawable.c, R.drawable.d, R.drawable.e }; // 图片标题集合 private final String[] imageDescriptions = { "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" }; protected int lastPosition; @Override protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);viewpaper = (ViewPager) findViewById(R.id.viewpaper);tv_imageDesc = (TextView) findViewById(R.id.tv_imageDesc);ll_pointGroup = (LinearLayout) findViewById(R.id.ll_pointGroup);tv_imageDesc.setText(imageDescriptions[0]);imageList = new ArrayList<ImageView>();for (int i = 0; i < imageIds.length; i++) {ImageView imageView = new ImageView(MainActivity.this);imageView.setImageResource(imageIds[i]);imageList.add(imageView);// 添加指示点ImageView point = new ImageView(this);LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT);params.rightMargin = 15;point.setLayoutParams(params);point.setBackgroundResource(R.drawable.doet);if (i == 0) {point.setEnabled(true);} else {point.setEnabled(false);}ll_pointGroup.addView(point);}// 设置适配器viewpaper.setAdapter(new MyAdapter());// 初始化位置viewpaper.setCurrentItem(Integer.MAX_VALUE / 2 – (Integer.MAX_VALUE / 2 % imageList.size()));// 设置监听viewpaper.setOnPageChangeListener(new OnPageChangeListener() {// 滑动后@Overridepublic void onPageSelected(int position) {position = position % imageList.size();// 设置文字描述内容tv_imageDesc.setText(imageDescriptions[position]);// 改变指示点的状态// 把当前点enbale 为truell_pointGroup.getChildAt(position).setEnabled(true);// 把上一个点设为falsell_pointGroup.getChildAt(lastPosition).setEnabled(false);lastPosition = position;tv_imageDesc.setText(imageDescriptions[position]);}// 滑动时@Overridepublic void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}// 状态改变@Overridepublic void onPageScrollStateChanged(int state) {}});isRunning=true; handler.sendEmptyMessageDelayed(0, 2000); } private boolean isRunning=false; Handler handler = new Handler() {@Overridepublic void handleMessage(Message msg) {//滑动到下一页viewpaper.setCurrentItem(viewpaper.getCurrentItem() + 1);//判断是否存在是的话就执行if (isRunning) {handler.sendEmptyMessageDelayed(0, 2000);}} }; protected void onDestroy() {isRunning=false;}; public class MyAdapter extends PagerAdapter {@Overridepublic int getCount() {return Integer.MAX_VALUE;}@Overridepublic boolean isViewFromObject(View view, Object object) {return view == object;}@Overridepublic Object instantiateItem(ViewGroup container, int position) {position = position % imageList.size();container.addView(imageList.get(position));return imageList.get(position);}@Overridepublic void destroyItem(ViewGroup container, int position, Object object) {container.removeView((View) object);object = null;} }}

去看日出，去散步，去欣赏大自然，

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