前言：经常会看到有一些app的banner界面可以实现循环播放多个广告图片和手动滑动循环。本以为单纯的ViewPager就可以实现这些功能。但是蛋疼的事情来了，ViewPager并不支持循环翻页。所以要实现循环还得需要自己去动手。自己在网上也找了些例子，本博文的Demo是结合自己找到的一些相关例子的基础上去改造，也希望对读者有用。
Demo实现的效果图如下：
Demo代码：
工程目录如下图：
废话不多说，上代码。
1.主Activity代码如下：
package com.stevenhu.android.phone.ui; import java.util.ArrayList; import java.util.List; import com.nostra13.universalimageloader.cache.disc.naming.Md5FileNameGenerator; import com.nostra13.universalimageloader.core.DisplayImageOptions; import com.nostra13.universalimageloader.core.ImageLoader; import com.nostra13.universalimageloader.core.ImageLoaderConfiguration; import com.nostra13.universalimageloader.core.assist.QueueProcessingType; import com.stevenhu.android.phone.bean.ADInfo; import com.stevenhu.android.phone.utils.ViewFactory; import android.annotation.SuppressLint; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.ImageView; import android.widget.Toast; import cn.androiddevelop.cycleviewpager.lib.CycleViewPager; import cn.androiddevelop.cycleviewpager.lib.CycleViewPager.ImageCycleViewListener; /** * 描述：主页 * * @author stevenhu * @version 2015年5月8日 上午10:47:37 */ public class MainActivity extends Activity { private List<ImageView> views = new ArrayList<ImageView>(); private List<ADInfo> infos = new ArrayList<ADInfo>(); private CycleViewPager cycleViewPager; private String[] imageUrls = {"http://img.taodiantong.cn/v55183/infoimg/2013-07/130720115322ky.jpg", "http://pic30.nipic.com/20130626/8174275_085522448172_2.jpg", "http://pic18.nipic.com/20111215/577405_080531548148_2.jpg", "http://pic15.nipic.com/20110722/2912365_092519919000_2.jpg", "http://pic.58pic.com/58pic/12/64/27/55U58PICrdX.jpg"}; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.ui_main); configImageLoader(); initialize(); } @SuppressLint("NewApi") private void initialize() { cycleViewPager = (CycleViewPager) getFragmentManager() .findFragmentById(R.id.fragment_cycle_viewpager_content); for(int i = 0; i < imageUrls.length; i ++){ ADInfo info = new ADInfo(); info.setUrl(imageUrls[i]); info.setContent("图片-->" + i ); infos.add(info); } // 将最后一个ImageView添加进来 views.add(ViewFactory.getImageView(this, infos.get(infos.size() - 1).getUrl())); for (int i = 0; i < infos.size(); i++) { views.add(ViewFactory.getImageView(this, infos.get(i).getUrl())); } // 将第一个ImageView添加进来 views.add(ViewFactory.getImageView(this, infos.get(0).getUrl())); // 设置循环，在调用setData方法前调用 cycleViewPager.setCycle(true); // 在加载数据前设置是否循环 cycleViewPager.setData(views, infos, mAdCycleViewListener); //设置轮播 cycleViewPager.setWheel(true); // 设置轮播时间，默认5000ms cycleViewPager.setTime(2000); //设置圆点指示图标组居中显示，默认靠右 cycleViewPager.setIndicatorCenter(); } private ImageCycleViewListener mAdCycleViewListener = new ImageCycleViewListener() { @Override public void onImageClick(ADInfo info, int position, View imageView) { if (cycleViewPager.isCycle()) { position = position - 1; Toast.makeText(MainActivity.this, "position-->" + info.getContent(), Toast.LENGTH_SHORT) .show(); } } }; /** * 配置ImageLoder */ private void configImageLoader() { // 初始化ImageLoader @SuppressWarnings("deprecation") DisplayImageOptions options = new DisplayImageOptions.Builder().showStubImage(R.drawable.icon_stub) // 设置图片下载期间显示的图片 .showImageForEmptyUri(R.drawable.icon_empty) // 设置图片Uri为空或是错误的时候显示的图片 .showImageOnFail(R.drawable.icon_error) // 设置图片加载或解码过程中发生错误显示的图片 .cacheInMemory(true) // 设置下载的图片是否缓存在内存中 .cacheOnDisc(true) // 设置下载的图片是否缓存在SD卡中 // .displayer(new RoundedBitmapDisplayer(20)) // 设置成圆角图片 .build(); // 创建配置过得DisplayImageOption对象 ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(getApplicationContext()).defaultDisplayImageOptions(options) .threadPriority(Thread.NORM_PRIORITY - 2).denyCacheImageMultipleSizesInMemory() .discCacheFileNameGenerator(new Md5FileNameGenerator()).tasksProcessingOrder(QueueProcessingType.LIFO).build(); ImageLoader.getInstance().init(config); } }
2.主文件ui_main.xml代码如下：
<"1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <fragment android:id="@+id/fragment_cycle_viewpager_content" android:name="cn.androiddevelop.cycleviewpager.lib.CycleViewPager" android:layout_width="match_parent" android:layout_height="180dip" /> <RelativeLayout android:layout_width="fill_parent" android:layout_height="0dip" android:layout_weight="1"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:text="content"/> </RelativeLayout> </LinearLayout>
3.CycleViewPager类代码如下：
package cn.androiddevelop.cycleviewpager.lib; import java.util.ArrayList; import java.util.List; import android.annotation.SuppressLint; import android.app.Fragment; import android.os.Bundle; import android.os.Message; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.FrameLayout; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.RelativeLayout; import com.stevenhu.android.phone.bean.ADInfo; import com.stevenhu.android.phone.ui.R; /** * 实现可循环，可轮播的viewpager */ @SuppressLint("NewApi") public class CycleViewPager extends Fragment implements OnPageChangeListener { private List<ImageView> imageViews = new ArrayList<ImageView>(); private ImageView[] indicators; private FrameLayout viewPagerFragmentLayout; private LinearLayout indicatorLayout; // 指示器 private BaseViewPager viewPager; private BaseViewPager parentViewPager; private ViewPagerAdapter adapter; private CycleViewPagerHandler handler; private int time = 5000; // 默认轮播时间 private int currentPosition = 0; // 轮播当前位置 private boolean isScrolling = false; // 滚动框是否滚动着 private boolean isCycle = false; // 是否循环 private boolean isWheel = false; // 是否轮播 private long releaseTime = 0; // 手指松开、页面不滚动时间，防止手机松开后短时间进行切换 private int WHEEL = 100; // 转动 private int WHEEL_WAIT = 101; // 等待 private ImageCycleViewListener mImageCycleViewListener; private List<ADInfo> infos; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = LayoutInflater.from(getActivity()).inflate( R.layout.view_cycle_viewpager_contet, null); viewPager = (BaseViewPager) view.findViewById(R.id.viewPager); indicatorLayout = (LinearLayout) view .findViewById(R.id.layout_viewpager_indicator); viewPagerFragmentLayout = (FrameLayout) view .findViewById(R.id.layout_viewager_content); handler = new CycleViewPagerHandler(getActivity()) { @Override public void handleMessage(Message msg) { super.handleMessage(msg); if (msg.what == WHEEL && imageViews.size() != 0) { if (!isScrolling) { int max = imageViews.size() + 1; int position = (currentPosition + 1) % imageViews.size(); viewPager.setCurrentItem(position, true); if (position == max) { // 最后一页时回到第一页 viewPager.setCurrentItem(1, false); } } releaseTime = System.currentTimeMillis(); handler.removeCallbacks(runnable); handler.postDelayed(runnable, time); return; } if (msg.what == WHEEL_WAIT && imageViews.size() != 0) { handler.removeCallbacks(runnable); handler.postDelayed(runnable, time); } } }; return view; } public void setData(List<ImageView> views, List<ADInfo> list, ImageCycleViewListener listener) { setData(views, list, listener, 0); } /** * 初始化viewpager * * @param views * 要显示的views * @param showPosition * 默认显示位置 */ public void setData(List<ImageView> views, List<ADInfo> list, ImageCycleViewListener listener, int showPosition) { mImageCycleViewListener = listener; infos = list; this.imageViews.clear(); if (views.size() == 0) { viewPagerFragmentLayout.setVisibility(View.GONE); return; } for (ImageView item : views) { this.imageViews.add(item); } int ivSize = views.size(); // 设置指示器 indicators = new ImageView[ivSize]; if (isCycle) indicators = new ImageView[ivSize - 2]; indicatorLayout.removeAllViews(); for (int i = 0; i < indicators.length; i++) { View view = LayoutInflater.from(getActivity()).inflate( R.layout.view_cycle_viewpager_indicator, null); indicators[i] = (ImageView) view.findViewById(R.id.image_indicator); indicatorLayout.addView(view); } adapter = new ViewPagerAdapter(); // 默认指向第一项，下方viewPager.setCurrentItem将触发重新计算指示器指向 setIndicator(0); viewPager.setOffscreenPageLimit(3); viewPager.setOnPageChangeListener(this); viewPager.setAdapter(adapter); if (showPosition < 0 || showPosition >= views.size()) showPosition = 0; if (isCycle) { showPosition = showPosition + 1; } viewPager.setCurrentItem(showPosition); } /** * 设置指示器居中，默认指示器在右方 */ public void setIndicatorCenter() { RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams( RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT); params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM); params.addRule(RelativeLayout.CENTER_HORIZONTAL); indicatorLayout.setLayoutParams(params); } /** * 是否循环，默认不开启，开启前，请将views的最前面与最后面各加入一个视图，用于循环 * * @param isCycle * 是否循环 */ public void setCycle(boolean isCycle) { this.isCycle = isCycle; } /** * 是否处于循环状态 * * @return */ public boolean isCycle() { return isCycle; } /** * 设置是否轮播，默认不轮播,轮播一定是循环的 * * @param isWheel */ public void setWheel(boolean isWheel) { this.isWheel = isWheel; isCycle = true; if (isWheel) { handler.postDelayed(runnable, time); } } /** * 是否处于轮播状态 * * @return */ public boolean isWheel() { return isWheel; } final Runnable runnable = new Runnable() { @Override public void run() { if (getActivity() != null && !getActivity().isFinishing() && isWheel) { long now = System.currentTimeMillis(); // 检测上一次滑动时间与本次之间是否有触击(手滑动)操作，有的话等待下次轮播 if (now - releaseTime > time - 500) { handler.sendEmptyMessage(WHEEL); } else { handler.sendEmptyMessage(WHEEL_WAIT); } } } }; /** * 释放指示器高度，可能由于之前指示器被限制了高度，此处释放 */ public void releaseHeight() { getView().getLayoutParams().height = RelativeLayout.LayoutParams.MATCH_PARENT; refreshData(); } /** * 设置轮播暂停时间，即没多少秒切换到下一张视图.默认5000ms * * @param time * 毫秒为单位 */ public void setTime(int time) { this.time = time; } /** * 刷新数据，当外部视图更新后，通知刷新数据 */ public void refreshData() { if (adapter != null) adapter.notifyDataSetChanged(); } /** * 隐藏CycleViewPager */ public void hide() { viewPagerFragmentLayout.setVisibility(View.GONE); } /** * 返回内置的viewpager * * @return viewPager */ public BaseViewPager getViewPager() { return viewPager; } /** * 页面适配器 返回对应的view * * @author Yuedong Li * */ private class ViewPagerAdapter extends PagerAdapter { @Override public int getCount() { return imageViews.size(); } @Override public boolean isViewFromObject(View arg0, Object arg1) { return arg0 == arg1; } @Override public void destroyItem(ViewGroup container, int position, Object object) { container.removeView((View) object); } @Override public View instantiateItem(ViewGroup container, final int position) { ImageView v = imageViews.get(position); if (mImageCycleViewListener != null) { v.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { mImageCycleViewListener.onImageClick(infos.get(currentPosition - 1), currentPosition, v); } }); } container.addView(v); return v; } @Override public int getItemPosition(Object object) { return POSITION_NONE; } } @Override public void onPageScrollStateChanged(int arg0) { if (arg0 == 1) { // viewPager在滚动 isScrolling = true; return; } else if (arg0 == 0) { // viewPager滚动结束 if (parentViewPager != null) parentViewPager.setScrollable(true); releaseTime = System.currentTimeMillis(); viewPager.setCurrentItem(currentPosition, false); } isScrolling = false; } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { } @Override public void onPageSelected(int arg0) { int max = imageViews.size() - 1; int position = arg0; currentPosition = arg0; if (isCycle) { if (arg0 == 0) { currentPosition = max - 1; } else if (arg0 == max) { currentPosition = 1; } position = currentPosition - 1; } setIndicator(position); } /** * 设置viewpager是否可以滚动 * * @param enable */ public void setScrollable(boolean enable) { viewPager.setScrollable(enable); } /** * 返回当前位置,循环时需要注意返回的position包含之前在views最前方与最后方加入的视图，即当前页面试图在views集合的位置 * * @return */ public int getCurrentPostion() { return currentPosition; } /** * 设置指示器 * * @param selectedPosition * 默认指示器位置 */ private void setIndicator(int selectedPosition) { for (int i = 0; i < indicators.length; i++) { indicators[i] .setBackgroundResource(R.drawable.icon_point); } if (indicators.length > selectedPosition) indicators[selectedPosition] .setBackgroundResource(R.drawable.icon_point_pre); } /** * 如果当前页面嵌套在另一个viewPager中，为了在进行滚动时阻断父ViewPager滚动，可以 阻止父ViewPager滑动事件 * 父ViewPager需要实现ParentViewPager中的setScrollable方法 */ public void disableParentViewPagerTouchEvent(BaseViewPager parentViewPager) { if (parentViewPager != null) parentViewPager.setScrollable(false); } /** * 轮播控件的监听事件 * * @author minking */ public static interface ImageCycleViewListener { /** * 单击图片事件 * * @param position * @param imageView */ public void onImageClick(ADInfo info, int postion, View imageView); } }
CycleViewPager类为实现可循环，可轮播的ViewPager的核心类，继承自Fragment，具体实现原理就不多说了，代码中都有相关的注释。
以上所述是小编给大家介绍的Android实现Banner界面广告图片循环轮播（包括实现手动滑动循环)，希望对大家有所帮助！
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