//The view of the main Activity XListView (there are 3 java codes) is best placed at the same level as MainActivity
public class MainActivity extends AppCompatActivity implements XListView.IXListViewListener {
//Define the number of pages
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
//Pull down
xListView .setPullRefreshEnable( true );
//Pull up
xListView .setPullLoadEnable( true );
//Set, you can return the pull-up and pull-down method
xListView .setXListViewListener( this );
getPost();
}
// Pull down POST to get data
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();
// Set request
connection.setRequestMethod( "POST" );
connection.setReadTimeout(5000);
connection.setConnectTimeout( 5000 );
//post method to submit parameters to the server ... submit to the server in a stream
connection.setDoOutput( true );
// set the type of request parameters
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;
}
// parse here, add adapter
@Override
protected void onPostExecute(String s) {
super .onPostExecute(s);
// parse
Gson gson = new Gson();
UserBean userBean = gson.fromJson(s, UserBean.class ) ;
list .addAll( 0 , userBean.getResult().getList());
// set adapter
setadapter();
// stop
xListView .stopRefresh();
Date date = new Date(System.currentTimeMillis());
SimpleDateFormat dateFormat = new SimpleDateFormat( "HH:mm" );
// Set time
xListView .setRefreshTime(dateFormat.format(date));
}
};
asyncTask.execute();
}
// Set adapter
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;
}
//Pull up GET to get data
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();
// Set
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>