Android：用ViewPager实现广告栏

现在常见的广告栏效果，自动切换广告，也可手动滑动切换。

我用ViewPager实现的，废话不多说，上代码：

1、布局文件 layout_ad_pager.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="160dp"android:baselineAligned="false" ><ImageViewandroid:id="@+id/home_default_image"android:layout_width="fill_parent"android:layout_height="wrap_content"android:scaleType="fitXY"android:src="@drawable/home_log_default"android:visibility="gone" /><android.support.v4.view.ViewPagerandroid:id="@+id/adv_pager"android:layout_width="fill_parent"android:layout_height="wrap_content"android:background="@drawable/img2" ></android.support.v4.view.ViewPager><LinearLayoutandroid:id="@+id/viewGroup"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_gravity="center_horizontal|bottom"android:layout_marginBottom="5dp"android:gravity="center"android:orientation="horizontal" ></LinearLayout></FrameLayout>

2、主要代码 AdPagerMainActivity.java

package app.adpager;import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import android.support.v7.app.ActionBarActivity;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.annotation.SuppressLint;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.Parcelable;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.ImageView;
import android.widget.LinearLayout;public class AdPagerMainActivity extends ActionBarActivity {private ImageView mDefaultImage = null;private ViewPager mImagePager = null;private ImageView[] mImageViews = null;private AtomicInteger what = new AtomicInteger(0);private boolean isContinue = true;private List<View> advPics;private Context mContext;private ImageView mImageView;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.layout_ad_pager);init();initView();initViewPager();}/*** 初始化数据*/private void init() {mContext = this;advPics = new ArrayList<View>();}/*** 初始化控件*/private void initView() {// TODO Auto-generated method stubmDefaultImage = (ImageView) findViewById(R.id.home_default_image);mImagePager = (ViewPager) findViewById(R.id.adv_pager);}/*** void*/private void initViewPager() {// TODO Auto-generated method stubmDefaultImage.setVisibility(View.GONE);mImagePager.setVisibility(View.VISIBLE);ImageView img1 = new ImageView(mContext);img1.setBackgroundResource(R.drawable.img1);advPics.add(img1);ImageView img2 = new ImageView(mContext);img2.setBackgroundResource(R.drawable.img2);advPics.add(img2);ImageView img3 = new ImageView(mContext);img3.setBackgroundResource(R.drawable.img3);advPics.add(img3);ImageView img4 = new ImageView(mContext);img4.setBackgroundResource(R.drawable.img4);advPics.add(img4);// group是R.layou.mainview中的负责包裹小圆点的LinearLayout.ViewGroup group = (ViewGroup) findViewById(R.id.viewGroup);mImageViews = new ImageView[advPics.size()];LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(13, 13);layoutParams.setMargins(5, 0, 5, 1);for (int i = 0; i < advPics.size(); i++) {mImageView = new ImageView(this);mImageView.setLayoutParams(layoutParams);mImageViews[i] = mImageView;if (i == 0) {// 默认选中第一张图片mImageViews[i].setBackgroundResource(R.drawable.item_focus);}else {mImageViews[i].setBackgroundResource(R.drawable.item_unfocus);}group.addView(mImageViews[i]);}mImagePager.setAdapter(new AdvAdapter(advPics));mImagePager.setOnPageChangeListener(new GuidePageChangeListener());// 按下时不继续定时滑动,弹起时继续定时滑动mImagePager.setOnTouchListener(new View.OnTouchListener() {@Overridepublic boolean onTouch(View v, MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:case MotionEvent.ACTION_MOVE:isContinue = false;break;case MotionEvent.ACTION_UP:isContinue = true;break;default:isContinue = true;break;}return false;}});// 定时滑动线程new Thread(new Runnable() {@Overridepublic void run() {while (true) {if (isContinue) {viewHandler.sendEmptyMessage(what.get());whatOption();}}}}).start();}/*** 操作圆点轮换变背景*/private void whatOption() {what.incrementAndGet();if (what.get() > mImageViews.length - 1) {what.getAndAdd(-mImageViews.length);}try {if (what.get() == 1) {Thread.sleep(3000);}else {Thread.sleep(2000);}}catch (InterruptedException e) {}}/*** 处理定时切换广告栏图片的句柄*/@SuppressLint("HandlerLeak")private final Handler viewHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {mImagePager.setCurrentItem(msg.what);super.handleMessage(msg);}};/** 指引页面改监听器 */private final class GuidePageChangeListener implements OnPageChangeListener {@Overridepublic void onPageScrollStateChanged(int arg0) {}@Overridepublic void onPageScrolled(int arg0, float arg1, int arg2) {}@Overridepublic void onPageSelected(int arg0) {arg0 = arg0 % advPics.size();for (int i = 0; i < mImageViews.length; i++) {mImageViews[arg0].setBackgroundResource(R.drawable.item_focus);if (arg0 != i) {mImageViews[i].setBackgroundResource(R.drawable.item_unfocus);}}what.set(arg0);}}/*** @Description: 广告栏PaperView 图片适配器*/private final class AdvAdapter extends PagerAdapter {private List<View> views = null;public AdvAdapter(List<View> views) {this.views = views;}@Overridepublic void destroyItem(View arg0, int arg1, Object arg2) {((ViewPager) arg0).removeView(views.get(arg1));}@Overridepublic void finishUpdate(View arg0) {}@Overridepublic int getCount() {return views.size();}@Overridepublic Object instantiateItem(View arg0, int arg1) {((ViewPager) arg0).addView(views.get(arg1), 0);return views.get(arg1);}@Overridepublic boolean isViewFromObject(View arg0, Object arg1) {return arg0 == arg1;}@Overridepublic void restoreState(Parcelable arg0, ClassLoader arg1) {}@Overridepublic Parcelable saveState() {return null;}@Overridepublic void startUpdate(View arg0) {}}
}

图片资源：

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