第一步,先写布局文件
- <com.main.util.SlideShowView
- android:id="@+id/slideshowView"
- android:layout_width="fill_parent"
- android:layout_height="300dp"
- android:layout_centerHorizontal="true"
- />
第二步,java代码
- package com.main.util;
- import java.util.ArrayList;
- import java.util.List;
- import java.util.concurrent.Executors;
- import java.util.concurrent.ScheduledExecutorService;
- import java.util.concurrent.TimeUnit;
- import com.main.R;
- import android.content.Context;
- import android.graphics.drawable.Drawable;
- import android.os.Handler;
- import android.os.Message;
- import android.os.Parcelable;
- import android.support.v4.view.PagerAdapter;
- import android.support.v4.view.ViewPager;
- import android.support.v4.view.ViewPager.OnPageChangeListener;
- import android.util.AttributeSet;
- import android.view.LayoutInflater;
- import android.view.View;
- import android.widget.FrameLayout;
- import android.widget.ImageView;
- import android.widget.ImageView.ScaleType;
- public class SlideShowView extends FrameLayout {
- //轮播图图片数量
- private final static int IMAGE_COUNT = 5;
- //自动轮播的时间间隔
- private final static int TIME_INTERVAL = 5;
- //自动轮播启用开关
- private final static boolean isAutoPlay = true;
- //自定义轮播图的资源ID
- private int[] imagesResIds;
- //放轮播图片的ImageView 的list
- private List<ImageView> imageViewsList;
- //放圆点的View的list
- private List<View> dotViewsList;
- private ViewPager viewPager;
- //当前轮播页
- private int currentItem = 0;
- //定时任务
- private ScheduledExecutorService scheduledExecutorService;
- //Handler
- private Handler handler = new Handler(){
- @Override
- public void handleMessage(Message msg) {
- // TODO Auto-generated method stub
- super.handleMessage(msg);
- viewPager.setCurrentItem(currentItem);
- }
- };
- public SlideShowView(Context context) {
- this(context,null);
- // TODO Auto-generated constructor stub
- }
- public SlideShowView(Context context, AttributeSet attrs) {
- this(context, attrs, 0);
- // TODO Auto-generated constructor stub
- }
- public SlideShowView(Context context, AttributeSet attrs, int defStyle) {
- super(context, attrs, defStyle);
- // TODO Auto-generated constructor stub
- initData();
- initUI(context);
- if(isAutoPlay){
- startPlay();
- }
- }
- /**
- * 开始轮播图切换
- */
- private void startPlay(){
- scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
- scheduledExecutorService.scheduleAtFixedRate(new SlideShowTask(), 1, 4, TimeUnit.SECONDS);
- }
- /**
- * 停止轮播图切换
- */
- private void stopPlay(){
- scheduledExecutorService.shutdown();
- }
- /**
- * 初始化相关Data
- */
- private void initData(){
- imagesResIds = new int[]{//图片数据
- R.drawable.p1,
- R.drawable.p2,
- };
- imageViewsList = new ArrayList<ImageView>();
- dotViewsList = new ArrayList<View>();
- }
- /**
- * 初始化Views等UI
- */
- private void initUI(Context context){
- LayoutInflater.from(context).inflate(R.layout.imageviewpager, this, true);
- for(int imageID : imagesResIds){
- ImageView view = new ImageView(context);
- view.setImageResource(imageID);
- view.setScaleType(ScaleType.FIT_XY);
- imageViewsList.add(view);
- }
- dotViewsList.add(findViewById(R.id.v_dot1));
- dotViewsList.add(findViewById(R.id.v_dot2));
- viewPager = (ViewPager) findViewById(R.id.viewPager);
- viewPager.setFocusable(true);
- viewPager.setAdapter(new MyPagerAdapter());
- viewPager.setOnPageChangeListener(new MyPageChangeListener());
- }
- /**
- * 填充ViewPager的页面适配器
- * @author caizhiming
- */
- private class MyPagerAdapter extends PagerAdapter{
- @Override
- public void destroyItem(View container, int position, Object object) {
- // TODO Auto-generated method stub
- //((ViewPag.er)container).removeView((View)object);
- ((ViewPager)container).removeView(imageViewsList.get(position));
- }
- @Override
- public Object instantiateItem(View container, int position) {
- // TODO Auto-generated method stub
- ((ViewPager)container).addView(imageViewsList.get(position));
- return imageViewsList.get(position);
- }
- @Override
- public int getCount() {
- // TODO Auto-generated method stub
- return imageViewsList.size();
- }
- @Override
- public boolean isViewFromObject(View arg0, Object arg1) {
- // TODO Auto-generated method stub
- return arg0 == arg1;
- }
- @Override
- public void restoreState(Parcelable arg0, ClassLoader arg1) {
- // TODO Auto-generated method stub
- }
- @Override
- public Parcelable saveState() {
- // TODO Auto-generated method stub
- return null;
- }
- @Override
- public void startUpdate(View arg0) {
- // TODO Auto-generated method stub
- }
- @Override
- public void finishUpdate(View arg0) {
- // TODO Auto-generated method stub
- }
- }
- /**
- * ViewPager的监听器
- * 当ViewPager中页面的状态发生改变时调用
- * @author caizhiming
- */
- private class MyPageChangeListener implements OnPageChangeListener{
- boolean isAutoPlay = false;
- @Override
- public void onPageScrollStateChanged(int arg0) {
- // TODO Auto-generated method stub
- switch (arg0) {
- case 1:// 手势滑动,空闲中
- isAutoPlay = false;
- break;
- case 2:// 界面切换中
- isAutoPlay = true;
- break;
- case 0:// 滑动结束,即切换完毕或者加载完毕
- // 当前为最后一张,此时从右向左滑,则切换到第一张
- if (viewPager.getCurrentItem() == viewPager.getAdapter().getCount() - 1 && !isAutoPlay) {
- viewPager.setCurrentItem(0);
- }
- // 当前为第一张,此时从左向右滑,则切换到最后一张
- else if (viewPager.getCurrentItem() == 0 && !isAutoPlay) {
- viewPager.setCurrentItem(viewPager.getAdapter().getCount() - 1);
- }
- break;
- }
- }
- @Override
- public void onPageScrolled(int arg0, float arg1, int arg2) {
- // TODO Auto-generated method stub
- }
- @Override
- public void onPageSelected(int pos) {
- // TODO Auto-generated method stub
- currentItem = pos;
- for(int i=0;i < dotViewsList.size();i++){
- if(i == pos){
- ((View)dotViewsList.get(pos)).setBackgroundResource(R.drawable.dot_black);
- }else {
- ((View)dotViewsList.get(i)).setBackgroundResource(R.drawable.dot_white);
- }
- }
- }
- }
- /**
- *执行轮播图切换任务
- *@author caizhiming
- */
- private class SlideShowTask implements Runnable{
- @Override
- public void run() {
- // TODO Auto-generated method stub
- synchronized (viewPager) {
- currentItem = (currentItem+1)%imageViewsList.size();
- handler.obtainMessage().sendToTarget();
- }
- }
- }
- /**
- * 销毁ImageView资源,回收内存
- * @author caizhiming
- */
- private void destoryBitmaps() {
- for (int i = 0; i < IMAGE_COUNT; i++) {
- ImageView imageView = imageViewsList.get(i);
- Drawable drawable = imageView.getDrawable();
- if (drawable != null) {
- //解除drawable对view的引用
- drawable.setCallback(null);
- }
- }
- }
- }