android ViewPager实现的轮播图广告自定义视图,网络获取图片和数据
public class SlideShowAdView extends FrameLayout {
//轮播图图片数量
private static int IMAGE_COUNT = 3;
//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 = false;
//自定义轮播图的资源ID
private List imageAd;
//放轮播图片的ImageView 的list
private List imageViewsList;
//放圆点的View的list
private List dotViewsList;
private ViewPager viewPager;
private DisplayImageOptions options;
private Context context;
//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);
}
};
private void initNeedUtil()
{
options = new DisplayImageOptions.Builder()
.showStubImage(R.drawable.jky_jzsbd)
// 设置图片下载期间显示的图片
.showImageForEmptyUri(R.drawable.jky_jzsbd)
// 设置图片Uri为空或是错误的时候显示的图片
.showImageOnFail(R.drawable.jky_jzsbd)
// 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
.imageScaleType(ImageScaleType.NONE)
.bitmapConfig(Bitmap.Config.RGB_565)// 防止内存溢出的，图片太多就这这个。还有其他设置
// .displayer(new RoundedBitmapDisplayer(20)) // 设置成圆角图片
.build();
ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(
context).threadPriority(Thread.NORM_PRIORITY - 2)
.denyCacheImageMultipleSizesInMemory()
.discCacheFileNameGenerator(new Md5FileNameGenerator())
.memoryCache(new LruMemoryCache(2 * 1024 * 1024))
.memoryCacheSize(2 * 1024 * 1024)// 缓存大小
.discCacheSize(50 * 1024 * 1024)// 存储卡缓存大小
.discCacheFileCount(100)// 文件数量
.tasksProcessingOrder(QueueProcessingType.LIFO).build();
ImageLoader.getInstance().init(config);// 创建配置过得DisplayImageOption对象
}
public SlideShowAdView(Context context) {
this(context,null);
// TODO Auto-generated constructor stub
this.context=context;
initNeedUtil();
}
public SlideShowAdView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
// TODO Auto-generated constructor stub
this.context=context;
initNeedUtil();
}
public SlideShowAdView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
this.context=context;
initNeedUtil();
initData(context);
}
private void startPlay(){
scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
scheduledExecutorService.scheduleAtFixedRate(new SlideShowTask(), 1, 4, TimeUnit.SECONDS);
}
private void stopPlay(){
scheduledExecutorService.shutdown();
}
private void initData(Context context){
imageViewsList = new ArrayList();
dotViewsList = new ArrayList();
try {
// 开一条子线程加载网络数据
Runnable runnable = new Runnable() {
public void run() {
try {
imageAd=new ProductUtils().GetIndexAdInfo();
// 发送消息，并把jsonArray结合对象传递过去
handler.sendMessage(handler.obtainMessage(0));
} catch (Exception e) {
e.printStackTrace();
}
}
};
// 开启线程
new Thread(runnable).start();
// handler与线程之间的通信及数据处理
handler = new Handler() {
public void handleMessage(Message msg) {
if (msg.what == 0) {
initUI();
}
}
};
} catch (Exception e) {
}
}
private void initUI(){
LayoutInflater.from(context).inflate(R.layout.layout_slideadshow, this, true);
for(int i=0;i
ImageView view = new ImageView(context);
view.setScaleType(ScaleType.FIT_XY);
ImageLoader.getInstance().displayImage(
imageAd.get(i).imgUrl,
view, options);
view.setTag(imageAd.get(i).ClassId);
final String className=imageAd.get(i).className;
final int classId=imageAd.get(i).ClassId;
final String imgU=imageAd.get(i).imgUrl;
final int cStep=i;
view.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0) {
Intent intent=new Intent(context,PromotionActivity.class);
intent.putExtra("actid", classId);
intent.putExtra("ctitle", className);
intent.putExtra("cUrl", imgU);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
}});
imageViewsList.add(view);
}
dotViewsList.add(findViewById(R.id.v_dot1));
dotViewsList.add(findViewById(R.id.v_dot2));
dotViewsList.add(findViewById(R.id.v_dot3));
viewPager = (ViewPager) findViewById(R.id.viewPager);
viewPager.setFocusable(true);
viewPager.setAdapter(new MyPagerAdapter());
viewPager.setOnPageChangeListener(new MyPageChangeListener());
if(isAutoPlay){
startPlay();
}
}
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
}
}
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，
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);
}
}
}
}
private class SlideShowTask implements Runnable{
@Override
public void run() {
// TODO Auto-generated method stub
synchronized (viewPager) {
currentItem = (currentItem+1)%imageViewsList.size();
handler.obtainMessage().sendToTarget();
}
}
}
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);
}
}
}
}
