图片轮播

自定义一个view

 

public class AdView extends RelativeLayout {


private List<String> urls;
private ViewPager pager;
private int currentItem = 0;
private Context mContext;
private LinearLayout group;
private ImageView[] pointImages;  //指示pointer
private ImageView pointImage;


public AdView(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
this.mContext=context;
LayoutInflater.from(context).inflate(R.layout.activity_ad_item,this);
pager = (ViewPager) findViewById(R.id.ad_item_viewpager);

}
public void initAdView(List<String> urls,onAdItemClickListener adItemClickListener) {
this.urls = urls;
group=(LinearLayout) findViewById(R.id.point_lay);
group.removeAllViews();
pointImages=new ImageView[urls.size()];
for(int i=0;i<urls.size();i++){
pointImage=new ImageView(mContext);
pointImage.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
pointImage.setPadding(10, 0, 10, 0);
pointImages[i]=pointImage;
if(i==0){
pointImages[0].setBackgroundResource(R.drawable.check_box_checked);
}else{
pointImages[i].setBackgroundResource(R.drawable.check_box_normal);
}
group.addView(pointImages[i]);
}
pager.setAdapter(new AdAdapter(adItemClickListener));
pager.setOffscreenPageLimit(1);
pager.setCurrentItem(0);
startAdNext();

pager.setOnTouchListener(new OnTouchListener() {

@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
stopAdNext();

break;
case MotionEvent.ACTION_UP:
startAdNext();
break;
}

return false;
}
});
pager.setOnPageChangeListener(new OnPageChangeListener() {

@Override
public void onPageSelected(int index) {
// TODO Auto-generated method stub
currentItem=index;
pointImages[index].setBackgroundResource(R.drawable.check_box_checked);
for(int i=0;i<pointImages.length;i++){

if(index!=i){
pointImages[i].setBackgroundResource(R.drawable.check_box_normal);
}
}
}

@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub

}

@Override
public void onPageScrollStateChanged(int state) {
// TODO Auto-generated method stub
//System.out.println("===onPageScrollStateChanged===="+arg0);
/* 
* SCROLL_STATE_IDLE: pager处于空闲状态 SCROLL_STATE_DRAGGING： pager处于正在拖拽中 
* SCROLL_STATE_SETTLING： pager正在自动沉降，相当于松手后，pager恢复到一个完整pager的过程 
*/ 
if(state==ViewPager.SCROLL_STATE_IDLE){//未拖动页面
startAdNext();
}
}
});

}

Handler handler=new Handler();

private void startAdNext(){


handler.postDelayed(run, 3000);

}
public void stopAdNext(){
handler.removeCallbacks(run);
}

private Runnable run=new Runnable() {

@Override
public void run() {
// TODO Auto-generated method stub
if(++currentItem==urls.size()){
currentItem=0;
}
pager.setCurrentItem(currentItem);
}
};
public interface onAdItemClickListener {

public void onImageClick(int position, View v);

}
private onAdItemClickListener onadItemClickListener;

class AdAdapter extends PagerAdapter {

public AdAdapter(onAdItemClickListener adItemClickListener) {
// TODO Auto-generated constructor stub
onadItemClickListener=adItemClickListener;
}

@Override
public int getCount() {
// TODO Auto-generated method stub
return urls.size();
}

@Override
public boolean isViewFromObject(View arg0, Object arg1) {
// TODO Auto-generated method stub
return arg0 == arg1;
}

@Override
public void destroyItem(ViewGroup container, int position, Object object) {
// TODO Auto-generated method stub
container.removeView((View) object);
}


@Override
public Object instantiateItem(ViewGroup container, final int position) {
// TODO Auto-generated method stub
ImageView image = new ImageView(getContext());
image.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT));
image.setScaleType(ScaleType.FIT_XY);
image.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
onadItemClickListener.onImageClick(position,v);
}
});
ImageLoader.getInstance().displayImage(urls.get(position), image);

container.addView(image);
return image;
}

}
}

在activity中初始化即可

 

        adView.initAdView(data,new onAdItemClickListener() {
            
            @Override
            public void onImageClick(int position, View v) {
                // TODO Auto-generated method stub
                Toast.makeText(getBaseContext(), "---"+position, 0).show();
            }
        });

 

初始化ImagerLoader

        private void initImageLoader() {
            DisplayImageOptions options = new DisplayImageOptions.Builder()
                    .resetViewBeforeLoading(true)
                    .cacheInMemory(true)//by patrick,to avoid image flicker in listview when item reused.it is tested that it will not cost much memory use
                    .cacheOnDisk(true)
                    .imageScaleType(ImageScaleType.EXACTLY)
                    .bitmapConfig(Bitmap.Config.RGB_565)
                    .considerExifParams(true)
                    .displayer(new SimpleBitmapDisplayer())
                    .build();

            ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(this)
                    .threadPoolSize(5) // default
                    .threadPriority(Thread.NORM_PRIORITY - 1) // default
                    .tasksProcessingOrder(QueueProcessingType.LIFO) // default
                    .denyCacheImageMultipleSizesInMemory()
                    .memoryCache(new LruMemoryCache(2 * 1024 * 1024))
                    .memoryCacheSize(2 * 1024 * 1024)
                    .memoryCacheSizePercentage(13) // default

                    .imageDownloader(new BaseImageDownloader(this)) // default
                    .imageDecoder(new BaseImageDecoder(true)) // default
                    .defaultDisplayImageOptions(options) // default
                    .build();

            ImageLoader.getInstance().init(config);
        }