Pull and refresh Android listView (load more)

Pull and refresh Android listView (load more)

Previously, it was also implemented. The ListView was pulled up and refreshed, but the open source code was used. Because I was too lazy and I didn't study the source code, I am not so fluent in writing it now. Fortunately, I found my own characteristics, so I wrote a Demo, basically implementing the new feature of ListView. As a practice, it may not be so perfect, based on the research of open source code, we will write a better and easy-to-understand drop-down and release a new Demo.

Implementation:

Go directly to the Code:

MainActivity:

 

 

Package com. listdemo; import java. util. arrayList; import java. util. hashMap; import java. util. list; import java. util. map; import android. app. activity; import android. graphics. color; import android. OS. bundle; import android. util. log; import android. view. view; import android. widget. absListView; import android. widget. absListView. onScrollListener; import android. widget. linearLayout; import android. widget. listView; import android. widget. textView; import android. widget. toast; public class MainActivity extends Activity {private ListView listView; private MyAdapter adapter; private List
 
  
List = new ArrayList
  
   
(); Private List
   
    
ListAll = new ArrayList
    
     
(); Private Map
     
      
Map = new HashMap
      
        (); Private boolean is_divPage; // whether to perform paging operations private MyAdapter mAdatper; private TextView TV _msg; private LinearLayout loading; private LinearLayout list_footer; // public static int pageNum = 1; // set the initialization value of pageNo to 1, that is, the first page of data is obtained by default. @ Overrideprotected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); listView = (ListView) findViewById (R. id. listView1);/*** Add the footer of ListView */list_footer = (LinearLayout) getLayoutInflater (). inflate (R. layout. list_footer, null); list_footer.setBackgroundColor (Color. parseColor (# ffffff); TV _msg = (TextView) list_footer.findViewById (R. Id. TV _msg); // more loading = (LinearLayout) list_footer.findViewById (R. id. loading); // read + progressBartv_msg.setVisibility (View. GONE); loading. setVisibility (View. VISIBLE); listView. addFooterView (list_footer);/*** add data to listView */initData ();/*** add data to each page (the data stored in each list) add to ListAll (store all data. */ListAll. addAll (list); adapter = new MyAdapter (this, listAll); listView. setAdapter (adapter);/*** listview listener event */listView. setOnScrollListener (new OnScrollListener () {@ Overridepublic void onScrollStateChanged (AbsListView view, int scrollState) {/*** if you wait until this page (is_divPage = true, and slide to stop (at this time the hand has left the screen) and automatically load more. */If (is_divPage & scrollState = OnScrollListener. SCROLL_STATE_IDLE) {Toast. makeText (MainActivity. this, getting more data ..., toast. LENGTH_SHORT ). show (); Log. d (zhongyao, call onScrollStateChanged !!!!); InitData (); listAll. addAll (list); adapter. yydatasetchanged (); TV _msg.setVisibility (View. INVISIBLE); loading. setVisibility (View. VISIBLE);} else if (! Is_divPage & scrollState = OnScrollListener. SCROLL_STATE_IDLE) {TV _msg.setVisibility (View. VISIBLE); loading. setVisibility (View. INVISIBLE) ;}@ Overridepublic void onScroll (AbsListView view, int detail, int visibleItemCount, int totalItemCount) {is_divPage = (detail + visibleItemCount = totalItemCount );}});} private void initData () {list. clear (); for (int I = 0; I <10; I ++) {list. add (zhongyao + I );}}}
      
     
    
   
  
 

Adapter:

 

MyAdapter:

 

Package com. listdemo; import java. util. arrayList; import java. util. list; import java. util. map; import android. content. context; import android. util. log; import android. view. layoutInflater; import android. view. view; import android. view. view. onClickListener; import android. view. viewGroup; import android. widget. baseAdapter; import android. widget. textView; import android. widget. toast;/*** adapter * @ author Administrator **/public class MyAdapter extends BaseAdapter {private Context context Context; private List
 
  
List = new ArrayList
  
   
(); Public MyAdapter (Context contex, List
   
    
List) {this. context = contex; this. list = list;} @ Overridepublic int getCount () {return list. size () ;}@ Overridepublic Object getItem (int position) {return list. get (position) ;}@ Overridepublic long getItemId (int position) {return position ;}@ Overridepublic View getView (final int position, View convertView, ViewGroup parent) {ViewHolder holder = null; if (convertView = null) {holder = new ViewHolder (); convertView = LayoutInflater. from (context ). inflate (R. layout. list_item, null); holder. TV _name = (TextView) convertView. findViewById (R. id. textView1); convertView. setTag (holder);} else {holder = (ViewHolder) convertView. getTag ();} holder. TV _name.setText (list. get (position); convertView. setOnClickListener (new OnClickListener () {@ Overridepublic void onClick (View v) {Toast. makeText (context, your choice is + position, 1 ). show () ;}}); return convertView;} class ViewHolder {private TextView TV _name, TV _age ;}}
   
  
 

Layout file:

 

Activity_main:

 

 

 

List_item;

 

List_footer: