android结合异步任务，动态加载图片，Json解析数据展示在ListView，并且实现按日期分类展示，借口回调
来源：互联网 发布：软件培训学校哪家好 编辑：程序博客网 时间：2024/05/01 17:08
需求分析：通过异步任务下载JSON数据，解析json数据，其中的日期数据要求按照日期将信息进行分类展示，还有图片的地址信息，每次得到一个图片地址，又开启一个下载图片的异步任务下载图片，并加载到相应的Item布局中。
1 创建一个借口，用于回调结果
public interface INetResourceCallback { void getNetResource(String netResource); }2 封装一个网络请求的工具类，通过接口回调返回数据
public class AsyncTaskTool{ /** * @param urlPath * @return */ public static DownloadNetResourceTask getDownloadNetResourceTask(String urlPath){ return new DownloadNetResourceTask(urlPath); }/** * 下载网络资源的字节数据的异步任务，使用构建者模式，默认为get请求，如果是post请求则调用post请求方法 * 使用接口INetResouceCallback 的getNetResource()方法回调将得到的数据返回到调用者中 * @author jola * */ public static class DownloadNetResourceTask extends AsyncTask<String, Integer, String>{ /** *请求的网络地址 */ private String urlPath; /** * 如果是POST请求，则需要传入此参数 */ private String requestParam; /** * 向异步任务注册的接口，用于返回得到的结果 */ @SuppressWarnings("unused") private INetResourceCallback mINetResourceCallback; public DownloadNetResourceTask(String urlPath){ this.urlPath = urlPath; } public DownloadNetResourceTask doPostRequestMethod(String requestParam){ this.requestParam = requestParam; return this; } public void execute(INetResourceCallback mINetResourceCallback){ this.mINetResourceCallback = mINetResourceCallback; super.execute(requestParam); } @Override protected String doInBackground(String... params) { try { HttpURLConnection conn = (HttpURLConnection)((new URL(urlPath)).openConnection()); conn.setConnectTimeout(5000); //如果有请求方式的参数传递进来，则将请求方式设置为POST if(null != requestParam){ conn.setRequestMethod("POST"); conn.setDoOutput(true); conn.getOutputStream().write(requestParam.getBytes()); conn.getOutputStream().flush(); } if(conn.getResponseCode() == HttpURLConnection.HTTP_OK){ InputStream in = conn.getInputStream(); int hasRead = 0; byte[] buffer = new byte[1024]; StringBuilder stringBuilder = new StringBuilder(); String strData = null; while(-1 != (hasRead = in.read(buffer))){ strData = new String(buffer,0,hasRead); stringBuilder.append(strData); } return stringBuilder.toString(); } } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return null; } @Override protected void onPostExecute(String result) { //将数据通过接口回调方式传过去 mINetResourceCallback.getNetResource(result); } }}<strong>3 定义好两个布局文件（日期分类的TextView,展示属于日<span style="font-family:Arial, Helvetica, sans-serif;"><span style="font-size: 18px; background-color: rgb(255, 255, 255);">期</span></span></strong>
TextView展示日期
<TextView android:id="@+id/time_group_item_txt" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="2016-09-23 今日开服" android:background="#F5F5DC" android:textColor="#FF4040" android:textSize="16sp" android:layout_margin="6dp" />
在当前日期下内容的item布局
<ImageView android:id="@+id/image_name_item_list" android:layout_marginTop="10dp" android:layout_width="60dp" android:layout_height="60dp" android:scaleType="centerCrop" /> <TextView android:id="@+id/title_name_item_list" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="皇图" android:textSize="20sp" android:layout_margin="6dp" android:layout_toRightOf="@id/image_name_item_list" /> <TextView android:id="@+id/start_time_name_item_list" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="09-23 10:00 384我的服服" android:singleLine="true" android:layout_below="@+id/title_name_item_list" android:layout_toRightOf="@+id/image_name_item_list" android:layout_alignLeft="@+id/title_name_item_list" android:drawableLeft="@drawable/clock_tag" /> <TextView android:id="@+id/operator_name_item_list" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="运营商：馆长当时的就卡机读卡公司" android:layout_toRightOf="@+id/image_name_item_list" android:layout_below="@+id/start_time_name_item_list" android:layout_alignLeft="@+id/title_name_item_list" /> <Button android:id="@+id/btn_name_item_list_view_main" android:layout_width="wrap_content" android:layout_height="40dp" android:layout_alignParentRight="true" android:text="查看" android:textColor="#FFFFFF" android:layout_marginRight="6dp" android:layout_marginTop="18dp" android:background="@drawable/shape" />
4 准备好基本的类，用于封装item中的信息
public class Giftbean implements Serializable{ private String addtime; private String area; private String gid; private String gift; private String gname; private String iconurl; private String id; private String linkurl; private String openflagname; private String operators; private String platform; private String score; private String teststarttime; private String uid; 省略get,set方法}5 主活动中代码如下：/** * GiftBagElves * @author jola * */public class MainActivity extends Activity implements INetResourceCallback { private final static String URLPATH = "http://www.1688wan.com/majax.action?method=getJtkaifu"; /** * 默认申请的是第一页的数据 */ private int pageno = 1; /** * mListView展示锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟较� */ private ListView mListView; /** * 存放解析到的json对象 */ private List<Giftbean> mListData; /** * 根据日趋对开服信息进行分类存储 */ private Map<String,List<Giftbean>> mTypeListData = new HashMap<String,List<Giftbean>>(); /** * 存放所有展示在ListView中的数据 */ private List<Object> allDatas = new ArrayList<Object>(); /** * 自定义适配器 */ private KaifuAdapter mAdapter; /** * item类型是时间，就返回1 */ private static final int ITEM_TYPE_DATA = 1; /** * item类型是开服对象数据，则返回2，加载相应的布局 */ private static final int ITEM_TYEP_KAIFU = 2; private static final int ITEM_TYPE_SUM = 2; /** * 锟斤拷锟截诧拷锟斤拷 */ private void initView(){ mListView = (ListView) findViewById(R.id.list_view_main_kaifu); mAdapter = new KaifuAdapter(); mListView.setAdapter(mAdapter); } /** * 实用工具类完成异步任务下载指定页面的网络资源,得到的结果在接口回调中 */ private void getNetResource(){ AsyncTaskTool.getDownloadNetResourceTask(URLPATH).execute(this); } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); getNetResource(); } /* (non-Javadoc) * @see InvokeInterface.INetResourceCallback#getNetResource(java.lang.String) * 接口回调，用于获取异步任务下载的得到的数据，通过JSON解析数据 */ @Override public void getNetResource(String netResource) { //JSON解析数据 Log.i(">>>>", netResource); parseKaiFuJSONData(netResource); } //JSON解析数据 private void parseKaiFuJSONData(String netResource){ try { JSONObject jsonObject = new JSONObject(netResource); JSONArray jsonArray = jsonObject.getJSONArray("info"); Giftbean kaifu = null; for(int i = 0 , len = jsonArray.length(); i < len ; i++){ kaifu = new Giftbean(); JSONObject object = jsonArray.getJSONObject(i); String gname = object.getString("gname"); kaifu.setGname(gname == null ? "" : gname); kaifu.setGid(object.getString("gid")); String addtime = object.getString("addtime"); kaifu.setAddtime(addtime == null ? "" : addtime); String linkurl = object.getString("linkurl"); kaifu.setLinkurl(linkurl == null ? "" : linkurl); String iconurl = object.getString("iconurl"); kaifu.setIconurl(iconurl == null ? "" : iconurl); String area = object.getString("area"); kaifu.setArea(area == null ? "" : area); kaifu.setOperators(object.getString("operators")); //分类操作，如果mTypeListData中还没有该类型，就创建一个List if(!mTypeListData.containsKey(addtime)){ mListData = new ArrayList<Giftbean>(); mListData.add(kaifu); mTypeListData.put(addtime, mListData); }else{ //如果已经包含了该时间的类型，则从Map中取出list,放入解析到的对象 mListData = mTypeListData.get(addtime); mListData.add(kaifu); } } //最后遍历mTeypListData，全部的类型，所有解析到的对象按顺序放入到放到allDatas中 for(Map.Entry<String,List<Giftbean>> entry : mTypeListData.entrySet()){ allDatas.add(entry.getKey());// mAdapter.notifyDataSetChanged(); List<Giftbean> typeList = entry.getValue(); for(Giftbean bean : typeList){ allDatas.add(bean);// mAdapter.notifyDataSetChanged(); }// allDatas.addAll(entry.getValue()); } mAdapter.notifyDataSetChanged(); } catch (JSONException e) { e.printStackTrace(); } } class KaifuAdapter extends BaseAdapter{ private LayoutInflater layoutInflater = LayoutInflater.from(MainActivity.this); @Override public int getCount() { return mListData == null ? 0 : allDatas.size(); } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return 0; } /* (non-Javadoc) * @see android.widget.BaseAdapter#getItemViewType(int) * 根据当前item的值类型，返回不同的item布局类型 */ @Override public int getItemViewType(int position) { Object object = allDatas.get(position); //如果当前的类型是String类型的，说明是日期 if(!(object instanceof Giftbean)){ return ITEM_TYPE_DATA; }else{ //如果是开服数据对象，则返回2 return ITEM_TYEP_KAIFU; } } @Override public int getViewTypeCount() { return ITEM_TYPE_SUM + 1; } @Override public View getView(int position, View convertView, ViewGroup parent) { View view = convertView; int type = getItemViewType(position); Giftbean kaiFuBean = new Giftbean(); TypeViewHolder typeViewHolder = null; KaiFuViewHolder kaiFuViewHolder = null; if(null == view){ switch (type) { case ITEM_TYPE_DATA: view = layoutInflater.inflate(R.layout.time_group_item_list_kaifu, parent,false); typeViewHolder = new TypeViewHolder(view); view.setTag(typeViewHolder); break; case ITEM_TYEP_KAIFU: view = layoutInflater.inflate(R.layout.name_item_list_kaifu, parent,false); kaiFuViewHolder = new KaiFuViewHolder(view); view.setTag(kaiFuViewHolder); break; default: break; } }else{ switch (type) { case ITEM_TYPE_DATA: typeViewHolder = (TypeViewHolder) view.getTag(); break; case ITEM_TYEP_KAIFU: kaiFuViewHolder = (KaiFuViewHolder) view.getTag(); default: break; } } switch (type) { case ITEM_TYPE_DATA: Object object = allDatas.get(position); if(object instanceof String){ typeViewHolder.typeTextView.setText((String)object); } break; case ITEM_TYEP_KAIFU: Object obj = allDatas.get(position); if(obj instanceof Giftbean){ kaiFuBean = ((Giftbean)obj); kaiFuViewHolder.gNameTextView.setText(kaiFuBean.getGname()); String linkurl = kaiFuBean.getLinkurl(); String area = kaiFuBean.getArea(); kaiFuViewHolder.timeAndAreaTextView.setText(linkurl +" "+ area); kaiFuViewHolder.operatorTextView.setText(kaiFuBean.getOperators()); kaiFuViewHolder.checkBtn.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { } }); ImageDownloadTask task = new ImageDownloadTask(kaiFuViewHolder.imageView); task.execute("http://www.1688wan.com"+kaiFuBean.getIconurl());// Log.i(">>>>", "http://www.1688wan.com"+kaiFuBean.getIconurl()); } break; default: break; } return view; } class ImageDownloadTask extends AsyncTask<String, Integer, Bitmap>{ private ImageView mImageView; public ImageDownloadTask(ImageView mImageView){ this.mImageView = mImageView; } @Override protected Bitmap doInBackground(String... params) { InputStream inputStream = null;// ByteArrayOutputStream byteArrayOutputStream = null; try { HttpURLConnection conn = (HttpURLConnection) (new URL(params[0])).openConnection();// conn.setConnectTimeout(5000); if(conn.getResponseCode() == HttpURLConnection.HTTP_OK){ inputStream = conn.getInputStream();// byteArrayOutputStream = new ByteArrayOutputStream();// int hasRead = 0;// byte[] buffer = new byte[1024];// while(-1 != inputStream.read(buffer)){// byteArrayOutputStream.write(buffer, 0, hasRead);// }// byteArrayOutputStream.flush();// byte[] imageByte = byteArrayOutputStream.toByteArray();// return BitmapFactory.decodeByteArray(imageByte, 0, imageByte.length); return BitmapFactory.decodeStream(inputStream); } } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); }finally{ streamClose(inputStream);// streamClose(byteArrayOutputStream); } return null; } public void streamClose(Closeable closeable){ if(closeable != null){ try { closeable.close(); } catch (Exception e) { } } } @Override protected void onPostExecute(Bitmap result) { if(null != result){ mImageView.setImageBitmap(result); } } } class TypeViewHolder{ TextView typeTextView; public TypeViewHolder(View view){ typeTextView = (TextView) view.findViewById(R.id.time_group_item_txt); } } class KaiFuViewHolder{ ImageView imageView; TextView gNameTextView; TextView timeAndAreaTextView; TextView operatorTextView; Button checkBtn; public KaiFuViewHolder(View view){ imageView = (ImageView) view.findViewById(R.id.image_name_item_list); gNameTextView = (TextView) view.findViewById(R.id.title_name_item_list); timeAndAreaTextView = (TextView) view.findViewById(R.id.start_time_name_item_list); operatorTextView = (TextView) view.findViewById(R.id.operator_name_item_list); checkBtn = (Button) view.findViewById(R.id.btn_name_item_list_view_main); } } }}
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