ImageLoader,GET,POST获取数据,多条目加载,XListView
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//主Activity XListView的view(里有3个java代码)最好放跟MainActivity同级public class MainActivity extends AppCompatActivity implements XListView.IXListViewListener { //定义的页数 int num = 0; private List<UserBean.ResultBean.ListBean> list = new ArrayList<>(); private MyAdapter adapter; private XListView xListView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //xlistview控件 xListView = (XListView) findViewById(R.id.x_list_view); //设置
//下拉 xListView.setPullRefreshEnable(true);
//上拉 xListView.setPullLoadEnable(true);
//设置了,可以返回上拉和下拉的方法 xListView.setXListViewListener(this); getPost(); } //下拉 POST获取数据 private void getPost() { AsyncTask<Void, Void, String> asyncTask = new AsyncTask<Void, Void, String>() { @Override protected String doInBackground(Void... voids) { String path = "http://v.juhe.cn/weixin/query"; try { URL url = new URL(path); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); //设置请求 connection.setRequestMethod("POST"); connection.setReadTimeout(5000); connection.setConnectTimeout(5000); //post方式要提交参数给服务器...以流的方式提交给服务器 connection.setDoOutput(true); //设置请求参数的类型 connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); String pathstring = "key=88f7bbc507e3ecacfaeab2b47dd8936f&ps=10&pno=" + num; connection.getOutputStream().write(pathstring.getBytes("utf-8")); //响应 int responseCode = connection.getResponseCode(); if (responseCode == 200) { InputStream inputStream = connection.getInputStream(); String json = StreamToString(inputStream, "utf-8"); Log.i("json", "json---->" + json); return json; } } catch (Exception e) { e.printStackTrace(); } return null; } //在这里解析,添加适配器 @Override protected void onPostExecute(String s) { super.onPostExecute(s); //解析 Gson gson = new Gson(); UserBean userBean = gson.fromJson(s, UserBean.class); list.addAll(0 , userBean.getResult().getList()); //设置适配器 setadapter(); //停止 xListView.stopRefresh(); Date date = new Date(System.currentTimeMillis()); SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm"); //设置时间 xListView.setRefreshTime(dateFormat.format(date)); } }; asyncTask.execute(); } //设置适配器 private void setadapter() { if (adapter == null){ adapter = new MyAdapter(MainActivity.this, list); xListView.setAdapter(adapter); }else{ adapter.notifyDataSetChanged(); } } //解析 private String StreamToString(InputStream inputStream, String s) { try { InputStreamReader inputStreamReader = new InputStreamReader(inputStream, s); BufferedReader bufferedReader = new BufferedReader(inputStreamReader); StringBuilder builder = new StringBuilder(); String string = ""; while ((string = bufferedReader.readLine()) != null){ builder.append(string); } bufferedReader.close(); Log.i("builder" , "builder------>" + builder.toString()); return builder.toString(); } catch (Exception e) { e.printStackTrace(); } return null; } //上拉 GET获取数据
public void getPostLoadMore() { AsyncTask<Void, Void, String> asyncTask = new AsyncTask<Void, Void, String>() { @Override protected String doInBackground(Void... voids) { String path = "http://v.juhe.cn/weixin/query?key=88f7bbc507e3ecacfaeab2b47dd8936f&ps=10&pno=" + num; try { URL url = new URL(path); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); //设置 connection.setRequestMethod("GET"); connection.setReadTimeout(5000); connection.setConnectTimeout(5000); //获取 int responseCode = connection.getResponseCode(); if (responseCode == 200){ InputStream inputStream = connection.getInputStream(); String json = StreamToString(inputStream,"utf-8"); return json; } } catch (Exception e) { e.printStackTrace(); } return ""; } @Override protected void onPostExecute(String json) { Gson gson = new Gson(); UserBean userBean = gson.fromJson(json, UserBean.class); //dataDataBean.getResults(); //数据要添加到集合的最前边 list.addAll(userBean.getResult().getList()); setadapter(); //停止刷新 xListView.stopLoadMore(); } }; asyncTask.execute(); }//下拉加载 @Override public void onRefresh() { num ++; Log.i("num" , "下拉num---->" + num); getPost();//加载到数据之后停止 } //上拉刷新 @Override public void onLoadMore() { if (num > 0){ num --; getPostLoadMore(); }else{ Toast.makeText(MainActivity.this,"没有最新数据了",Toast.LENGTH_SHORT).show(); xListView.stopLoadMore(); } Log.i("num" , "上拉num---->" + num); }}
//Adapter listview的适配器public class MyAdapter extends BaseAdapter { private static final int IMAGE_ITEM_LEFT = 0; private static final int IMAGE_ITEM_RIGHT = 1; Context context; List<UserBean.ResultBean.ListBean> list; public MyAdapter(Context context, List<UserBean.ResultBean.ListBean> list) { this.context = context; this.list = list; ImageLoader.getInstance().init(ImageLoaderConfiguration.createDefault(context)); } @Override public int getCount() { return list.size(); } @Override public Object getItem(int i) { return list.get(i); } @Override public long getItemId(int i) { return i; } //多条目加载 所需get(1)getViewTypeCount @Override public int getViewTypeCount() { return 2; } //多条目加载 所需get(2)getItemViewType @Override public int getItemViewType(int position) { if ((position%2) == 0){ return IMAGE_ITEM_LEFT; } return IMAGE_ITEM_RIGHT; } @Override public View getView(int i, View view, ViewGroup viewGroup) { if (getItemViewType(i) == IMAGE_ITEM_LEFT){ ViewHolderLeft holderLeft; if (view == null){ holderLeft = new ViewHolderLeft(); view = View.inflate(context , R.layout.image_left , null); holderLeft.textView = view.findViewById(R.id.text_title); holderLeft.imageView = view.findViewById(R.id.iamge_01); view.setTag(holderLeft); }else{ holderLeft = (ViewHolderLeft) view.getTag(); } holderLeft.textView.setText(list.get(i).getTitle()); ImageLoader.getInstance().displayImage(list.get(i).getFirstImg() , holderLeft.imageView , getOption()); }else{ ViewHolderRight holderRight; if (view == null){ holderRight = new ViewHolderRight(); view = View.inflate(context , R.layout.image_right , null); holderRight.textView = view.findViewById(R.id.text_title); holderRight.imageView = view.findViewById(R.id.iamge_02); view.setTag(holderRight); }else{ holderRight = (ViewHolderRight) view.getTag(); } holderRight.textView.setText(list.get(i).getTitle()); ImageLoader.getInstance().displayImage(list.get(i).getFirstImg() , holderRight.imageView , getOption()); } return view; } public DisplayImageOptions getOption() { DisplayImageOptions imageOptions = new DisplayImageOptions.Builder() .showImageForEmptyUri(R.mipmap.ic_launcher) .showImageOnFail(R.mipmap.ic_launcher) .showImageOnLoading(R.mipmap.ic_launcher) .cacheInMemory(true) .cacheOnDisk(true) .imageScaleType(ImageScaleType.EXACTLY_STRETCHED) .resetViewBeforeLoading(true)//在加载之前复位一下显示 .bitmapConfig(Bitmap.Config.RGB_565)//图片的质量 .considerExifParams(true)//是否考虑JPEG图像EXIF参数（旋转，翻转） .build(); return imageOptions; } class ViewHolderLeft{ ImageView imageView; TextView textView; } class ViewHolderRight{ TextView textView; ImageView imageView; }}//XML布局 footer<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" > <RelativeLayout android:id="@+id/xlistview_footer_content" android:layout_width="fill_parent" android:layout_height="wrap_content" android:padding="10dp" > <ProgressBar android:id="@+id/xlistview_footer_progressbar" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:visibility="invisible" /> <TextView android:id="@+id/xlistview_footer_hint_textview" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:text="@string/xlistview_footer_hint_normal" /> </RelativeLayout></LinearLayout>//XML布局 header<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="bottom" > <RelativeLayout android:id="@+id/xlistview_header_content" android:layout_width="fill_parent" android:layout_height="60dp" > <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:gravity="center" android:orientation="vertical" android:id="@+id/xlistview_header_text"> <TextView android:id="@+id/xlistview_header_hint_textview" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/xlistview_header_hint_normal" /> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="3dp" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/xlistview_header_last_time" android:textSize="12sp" /> <TextView android:id="@+id/xlistview_header_time" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="12sp" /> </LinearLayout> </LinearLayout> <ImageView android:id="@+id/xlistview_header_arrow" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@id/xlistview_header_text" android:layout_centerVertical="true" android:layout_marginLeft="-35dp" android:src="@drawable/xlistview_arrow" /> <ProgressBar android:id="@+id/xlistview_header_progressbar" android:layout_width="30dp" android:layout_height="30dp" android:layout_alignLeft="@id/xlistview_header_text" android:layout_centerVertical="true" android:layout_marginLeft="-40dp" android:visibility="invisible" /> </RelativeLayout></LinearLayout>
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