谷歌电子市场8--首页轮播图

Override
public View onCreateSuccessView() {
MyListView view = new MyListView(UIUtils.getContext());

// 添加头布局
HomeHeaderHolder header = new HomeHeaderHolder();
view.addHeaderView(header.getRootView());
// 设置头布局数据
header.setData(mPicList);

view.setAdapter(new HomeAdapter(mList));
return view;
}

@Override
public ResultState onLoad() {
// 从网络加载数据
HomeProtocol protocol = new HomeProtocol();
mList = protocol.getData(0);// 加载第一页数据
mPicList = protocol.getPicList();

return check(mList);
}

public class HomeHeaderHolder extends BaseHolder<ArrayList<String>>     {

private ArrayList<String> mList;

private ViewPager mViewPager;
private LinearLayout mIndicator;

private int mPreviousPos;// 上一个被选中圆点的位置

@Override
public View initView() {
// 头布局的根布局
RelativeLayout header = new RelativeLayout(UIUtils.getContext());

// 根布局布局参数
AbsListView.LayoutParams params = new AbsListView.LayoutParams(
AbsListView.LayoutParams.MATCH_PARENT,
UIUtils.getDimen(R.dimen.list_header_height));
header.setLayoutParams(params);

// 初始化ViewPager
mViewPager = new ViewPager(UIUtils.getContext());
mViewPager.setLayoutParams(new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.MATCH_PARENT,
RelativeLayout.LayoutParams.MATCH_PARENT));

// 将ViewPager添加给根布局
header.addView(mViewPager);

// 页码指示器
mIndicator = new LinearLayout(UIUtils.getContext());
// 设置边距
int padding = UIUtils.dip2px(5);
mIndicator.setPadding(padding, padding, padding, padding);

// 初始化页码指示器布局参数
RelativeLayout.LayoutParams iParams = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
// 设置当前线性布局相对于父控件的位置
iParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
iParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);

mIndicator.setLayoutParams(iParams);

// 将页码指示器添加给根布局
header.addView(mIndicator);

mViewPager.setOnPageChangeListener(new OnPageChangeListener() {

@Override
public void onPageSelected(int arg0) {
// 将当前圆点设置为选中样式
ImageView view = (ImageView) mIndicator.getChildAt(arg0);
view.setImageResource(R.drawable.indicator_selected);

// 将上一个圆点设置为默认样式
ImageView prView = (ImageView) mIndicator
.getChildAt(mPreviousPos);
prView.setImageResource(R.drawable.indicator_normal);

mPreviousPos = arg0;
}

@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {

}

@Override
public void onPageScrollStateChanged(int arg0) {

}
});

return header;
}

@Override
public void refreshView(ArrayList<String> data) {
mList = data;
mViewPager.setAdapter(new MyPagerAdapter());

mIndicator.removeAllViews();// 保险期间,先清除所有子view

LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
for (int i = 0; i < mList.size(); i++) {
ImageView view = new ImageView(UIUtils.getContext());
if (i == 0) {
view.setImageResource(R.drawable.indicator_selected);
} else {
view.setImageResource(R.drawable.indicator_normal);
params.leftMargin = UIUtils.dip2px(3);// 设置圆点间距
}

mIndicator.addView(view, params);
}
}

class MyPagerAdapter extends PagerAdapter {

private BitmapUtils mBitmapUtils;

public MyPagerAdapter() {
mBitmapUtils = BitmapHelper.getBitmapUtils();
mBitmapUtils.configDefaultLoadingImage(R.drawable.subject_default);
}

@Override
public int getCount() {
return mList.size();
}

@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}

@Override
public Object instantiateItem(ViewGroup container, int position) {
ImageView view = new ImageView(UIUtils.getContext());
view.setScaleType(ScaleType.FIT_XY);
mBitmapUtils.display(view,
HttpHelper.URL + "image?name=" + mList.get(position));
container.addView(view);
return view;
}

@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
}
}

MyPagerAdapter.java

@Override
public int getCount() {
return Integer.MAX_VALUE;
}

@Override
public Object instantiateItem(ViewGroup container, int position) {
int pos = position % mList.size();
}

------------------------------------

@Override
public void onPageSelected(int arg0) {
int pos = arg0 % mList.size();

// 将当前圆点设置为选中样式
ImageView view = (ImageView) mIndicator.getChildAt(pos);
view.setImageResource(R.drawable.indicator_selected);

if(pos!=mPreviousPos) {
// 将上一个圆点设置为默认样式
ImageView prView = (ImageView) mIndicator
.getChildAt(mPreviousPos);
prView.setImageResource(R.drawable.indicator_normal);
}

mPreviousPos = pos;
}

--------------------------------------

// 设置viewpager滑动的初始位置
mViewPager.setCurrentItem(mList.size() * 1000);

class RunnableTask implements Runnable {

public void start() {
// 移除之前遗留的任务(handler只有一个,但HomeFragment有可能多次被创建,
// 从而导致消息被重复发送,所以需要先把之前的消息移除掉)
UIUtils.getHandler().removeCallbacksAndMessages(null);
// 发送延时2秒的任务
UIUtils.getHandler().postDelayed(this, 2000);
}

@Override
public void run() {
// 跳到viewpager下一个页面
int currentItem = mViewPager.getCurrentItem();
currentItem++;
mViewPager.setCurrentItem(currentItem);

// 继续发送延时两秒的任务, 形成闭环, 达到循环执行的效果
UIUtils.getHandler().postDelayed(this, 2000);
}

}

// 开启自动轮播效果
new RunnableTask().start();