android 项目学习随笔十六（ 广告轮播条播放）

广告轮播条播放

if (mHandler == null) {//在此初始化mHandler , 保证消息不重复发送
mHandler = new Handler() {
public void handleMessage(android.os.Message msg) {
int currentItem = mViewPager.getCurrentItem();

if (currentItem < mTopNewsList.size() - 1) {
currentItem++;
} else {
currentItem = 0;
}

mViewPager.setCurrentItem(currentItem);

mHandler.sendEmptyMessageDelayed(0, 2000);
};
};

// 延时2秒切换广告条
mHandler.sendEmptyMessageDelayed(0, 2000);

mViewPager.setOnTouchListener(new OnTouchListener() {

@Override
public boolean onTouch(View v, MotionEvent event) {//当点击广告时，停止轮换
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
System.out.println("ACTION_DOWN");
// 删除所有消息
mHandler.removeCallbacksAndMessages(null);
break;
case MotionEvent.ACTION_CANCEL:// 事件取消(当按下后,然后移动下拉刷新,导致抬起后无法响应ACTION_UP,
// 但此时会响应ACTION_CANCEL,也需要继续播放轮播条)
case MotionEvent.ACTION_UP:
// 延时2秒切换广告条
mHandler.sendEmptyMessageDelayed(0, 2000);
break;
default:
break;
}
return false;
}
});

 

import java.util.ArrayList;import android.app.Activity;import android.content.Intent;import android.graphics.Color;import android.os.Handler;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager.OnPageChangeListener;import android.text.TextUtils;import android.view.MotionEvent;import android.view.View;import android.view.View.OnTouchListener;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.ImageView.ScaleType;import android.widget.TextView;import android.widget.Toast;import com.google.gson.Gson;import com.itheima.zhsh66.NewsDetailActivity;import com.itheima.zhsh66.R;import com.itheima.zhsh66.base.BaseMenuDetailPager;import com.itheima.zhsh66.domain.NewsData;import com.itheima.zhsh66.domain.NewsData.News;import com.itheima.zhsh66.domain.NewsData.TopNews;import com.itheima.zhsh66.domain.NewsMenuData.NewsTabData;import com.itheima.zhsh66.global.Constants;import com.itheima.zhsh66.utils.CacheUtils;import com.itheima.zhsh66.utils.PrefUtils;import com.itheima.zhsh66.view.HorizontalScrollViewPager;import com.itheima.zhsh66.view.RefreshListView;import com.itheima.zhsh66.view.RefreshListView.OnRefreshListener;import com.lidroid.xutils.BitmapUtils;import com.lidroid.xutils.HttpUtils;import com.lidroid.xutils.ViewUtils;import com.lidroid.xutils.exception.HttpException;import com.lidroid.xutils.http.ResponseInfo;import com.lidroid.xutils.http.callback.RequestCallBack;import com.lidroid.xutils.http.client.HttpRequest.HttpMethod;import com.lidroid.xutils.view.annotation.ViewInject;import com.viewpagerindicator.CirclePageIndicator;/** * 12个页签的页面对象 *  */public class TabDetailPager extends BaseMenuDetailPager {    // 页签分类的网络信息    private NewsTabData mTabData;    // 网络返回的新闻列表数据    private NewsData mNewsTabData;    // 加载新闻列表的url    private String mUrl;    // 头条新闻的网络数据    private ArrayList<TopNews> mTopNewsList;    // 头条新闻的数据适配器    private TopNewsAdapter mTopNewsAdapter;    // 新闻列表的集合    private ArrayList<News> mNewsList;    private NewsAdapter mNewsAdapter;    @ViewInject(R.id.vp_tab_detail)    private HorizontalScrollViewPager mViewPager;    @ViewInject(R.id.lv_tab_detail)    private RefreshListView lvList;    @ViewInject(R.id.indicator)    private CirclePageIndicator mIndicator;    @ViewInject(R.id.tv_title)    private TextView tvTopNewsTitle;    private String mMoreUrl;// 下一页的链接    private Handler mHandler = null;    public TabDetailPager(Activity activity, NewsTabData tabData) {        super(activity);        mTabData = tabData;        mUrl = Constants.SERVER_URL + mTabData.url;    }    @Override    public View initView() {        View view = View.inflate(mActivity, R.layout.pager_tab_detail, null);        ViewUtils.inject(this, view);        View header = View.inflate(mActivity, R.layout.list_header_topnews,                null);        ViewUtils.inject(this, header);// 必须也将头布局注入到ViewUtils        // 给listview添加头布局        lvList.addHeaderView(header);        // 设置下拉刷新监听        lvList.setOnRefreshListener(new OnRefreshListener() {            @Override            public void onRefresh() {                // 从网络加载数据                getDataFromServer();            }            @Override            public void loadMore() {                // 加载更多数据                if (mMoreUrl != null) {                    System.out.println("加载下一页数据...");                    getMoreDataFromServer();                } else {                    lvList.onRefreshComplete(true);// 收起加载更多布局                    Toast.makeText(mActivity, "没有更多数据了", Toast.LENGTH_SHORT)                            .show();                }            }        });        lvList.setOnItemClickListener(new OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view,                    int position, long id) {                System.out.println("pos:" + position);                News news = mNewsList.get(position);                // 当前点击的item的标题颜色置灰                TextView tvTitle = (TextView) view.findViewById(R.id.tv_title);                tvTitle.setTextColor(Color.GRAY);                // 将已读状态持久化到本地                // key: read_ids; value: 1324,1325,1326                String readIds = PrefUtils.getString("read_ids", "", mActivity);                if (!readIds.contains(news.id)) {// 以前没有添加过,才添加进来                    readIds = readIds + news.id + ",";// 1324,1325,                    PrefUtils.putString("read_ids", readIds, mActivity);                }                // 跳到详情页                Intent intent = new Intent(mActivity, NewsDetailActivity.class);                intent.putExtra("url", news.url);                mActivity.startActivity(intent);            }        });        return view;    }    @Override    public void initData() {        String cache = CacheUtils.getCache(mUrl, mActivity);        if (!TextUtils.isEmpty(cache)) {            processResult(cache, false);        }        getDataFromServer();    }    private void getDataFromServer() {        HttpUtils utils = new HttpUtils();        utils.send(HttpMethod.GET, mUrl, new RequestCallBack<String>() {            @Override            public void onSuccess(ResponseInfo<String> responseInfo) {                String result = responseInfo.result;                processResult(result, false);                System.out.println("访问网络成功!!!");                CacheUtils.setCache(mUrl, result, mActivity);                // 收起下拉刷新控件                lvList.onRefreshComplete(true);            }            @Override            public void onFailure(HttpException error, String msg) {                // 收起下拉刷新控件                lvList.onRefreshComplete(false);                error.printStackTrace();                Toast.makeText(mActivity, msg, Toast.LENGTH_SHORT).show();            }        });    }    /**     * 加载更多数据     */    protected void getMoreDataFromServer() {        HttpUtils utils = new HttpUtils();        utils.send(HttpMethod.GET, mMoreUrl, new RequestCallBack<String>() {            @Override            public void onSuccess(ResponseInfo<String> responseInfo) {                String result = responseInfo.result;                processResult(result, true);                // 收起加载更多布局                lvList.onRefreshComplete(true);            }            @Override            public void onFailure(HttpException error, String msg) {                error.printStackTrace();                Toast.makeText(mActivity, msg, Toast.LENGTH_SHORT).show();                // 收起加载更多布局                lvList.onRefreshComplete(false);            }        });    }    protected void processResult(String result, boolean isMore) {        Gson gson = new Gson();        mNewsTabData = gson.fromJson(result, NewsData.class);        if (!TextUtils.isEmpty(mNewsTabData.data.more)) {            // 初始化下一页链接地址            mMoreUrl = Constants.SERVER_URL + mNewsTabData.data.more;        } else {            // 没有下一页了            mMoreUrl = null;        }        if (!isMore) {            // 初始化头条新闻            mTopNewsList = mNewsTabData.data.topnews;            if (mTopNewsList != null) {                mTopNewsAdapter = new TopNewsAdapter();                mViewPager.setAdapter(mTopNewsAdapter);                mIndicator.setViewPager(mViewPager);// 将指示器和viewpager绑定                mIndicator.setSnap(true);// 快照模式                mIndicator.setOnPageChangeListener(new OnPageChangeListener() {                    @Override                    public void onPageSelected(int position) {                        //System.out.println("position:" + position);                        TopNews topNews = mTopNewsList.get(position);                        tvTopNewsTitle.setText(topNews.title);                    }                    @Override                    public void onPageScrolled(int position,                            float positionOffset, int positionOffsetPixels) {                    }                    @Override                    public void onPageScrollStateChanged(int state) {                    }                });                mIndicator.onPageSelected(0);// 将小圆点位置归零, 解决它会在页面销毁时仍记录上次位置的bug                tvTopNewsTitle.setText(mTopNewsList.get(0).title);// 初始化第一页标题            }            // 初始化新闻列表            mNewsList = mNewsTabData.data.news;            if (mNewsList != null) {                mNewsAdapter = new NewsAdapter();                lvList.setAdapter(mNewsAdapter);            }            if (mHandler == null) {                mHandler = new Handler() {                    public void handleMessage(android.os.Message msg) {                        int currentItem = mViewPager.getCurrentItem();                        if (currentItem < mTopNewsList.size() - 1) {                            currentItem++;                        } else {                            currentItem = 0;                        }                        mViewPager.setCurrentItem(currentItem);                        mHandler.sendEmptyMessageDelayed(0, 2000);                    };                };                // 延时2秒切换广告条                mHandler.sendEmptyMessageDelayed(0, 2000);                mViewPager.setOnTouchListener(new OnTouchListener() {                    @Override                    public boolean onTouch(View v, MotionEvent event) {                        switch (event.getAction()) {                        case MotionEvent.ACTION_DOWN:                            System.out.println("ACTION_DOWN");                            // 删除所有消息                            mHandler.removeCallbacksAndMessages(null);                            break;                        case MotionEvent.ACTION_CANCEL:// 事件取消(当按下后,然后移动下拉刷新,导致抬起后无法响应ACTION_UP,                                                        // 但此时会响应ACTION_CANCEL,也需要继续播放轮播条)                        case MotionEvent.ACTION_UP:                            // 延时2秒切换广告条                            mHandler.sendEmptyMessageDelayed(0, 2000);                            break;                        default:                            break;                        }                        return false;                    }                });            }        } else {            // 加载更多            ArrayList<News> moreData = mNewsTabData.data.news;            mNewsList.addAll(moreData);// 追加数据            mNewsAdapter.notifyDataSetChanged();// 刷新listview        }    }    class TopNewsAdapter extends PagerAdapter {        BitmapUtils mBitmapUtils;        public TopNewsAdapter() {            // 初始化xutils中的加载图片的工具            mBitmapUtils = new BitmapUtils(mActivity);            // 设置默认加载图片            mBitmapUtils                    .configDefaultLoadingImage(R.drawable.topnews_item_default);        }        @Override        public int getCount() {            return mTopNewsList.size();        }        @Override        public boolean isViewFromObject(View arg0, Object arg1) {            return arg0 == arg1;        }        @Override        public Object instantiateItem(ViewGroup container, int position) {            ImageView view = new ImageView(mActivity);            view.setScaleType(ScaleType.FIT_XY);// 设置图片填充效果, 表示填充父窗体            // 获取图片链接, 使用链接下载图片, 将图片设置给ImageView, 考虑内存溢出问题, 图片本地缓存            mBitmapUtils.display(view, mTopNewsList.get(position).topimage);            container.addView(view);            return view;        }        @Override        public void destroyItem(ViewGroup container, int position, Object object) {            container.removeView((View) object);        }    }    class NewsAdapter extends BaseAdapter {        public BitmapUtils mBitmapUtils;        public NewsAdapter() {            mBitmapUtils = new BitmapUtils(mActivity);            mBitmapUtils                    .configDefaultLoadingImage(R.drawable.pic_item_list_default);        }        @Override        public int getCount() {            return mNewsList.size();        }        @Override        public News getItem(int position) {            return mNewsList.get(position);        }        @Override        public long getItemId(int position) {            return position;        }        @Override        public View getView(int position, View convertView, ViewGroup parent) {            ViewHolder holder;            if (convertView == null) {                convertView = View.inflate(mActivity, R.layout.list_item_news,                        null);                holder = new ViewHolder();                holder.tvTitle = (TextView) convertView                        .findViewById(R.id.tv_title);                holder.tvDate = (TextView) convertView                        .findViewById(R.id.tv_date);                holder.ivIcon = (ImageView) convertView                        .findViewById(R.id.iv_icon);                convertView.setTag(holder);            } else {                holder = (ViewHolder) convertView.getTag();            }            News news = getItem(position);            holder.tvTitle.setText(news.title);            holder.tvDate.setText(news.pubdate);            mBitmapUtils.display(holder.ivIcon, news.listimage);            // 标记已读和未读            String readIds = PrefUtils.getString("read_ids", "", mActivity);            if (readIds.contains(news.id)) {                // 已读                holder.tvTitle.setTextColor(Color.GRAY);            } else {                // 未读                holder.tvTitle.setTextColor(Color.BLACK);            }            return convertView;        }    }    static class ViewHolder {        public TextView tvTitle;        public TextView tvDate;        public ImageView ivIcon;    }}

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