"Android" uses swiperefreshlayout to implement a pull-down refresh

See an open source project on Codepath today [click to view] The use of the swiperefreshlayout implementation of the drop-down refresh, but the example is not complete, so he wrote down. Before seeing Guo Lin's blog also introduced a drop-down refresh, but he is purely manual implementation, the code is large, More cumbersome. [Click to view] while using Android to provide Swiperefreshlayout has greatly reduced our workload, of course, learned to use Swiperefreshlayout after the recommendation to see how not to help Swiperefreshlayout "drop-down refresh" from scratch.

swiperefreshlayout is a ViewGroup" can hold only one scrollable view as a child. This can is either A scrollview  or anadapterview  such as A listview .

Note: This layout is exists within more recent versions of the SUPPORT-V4 as explained in this post. Edit your app/build.gradle file to include a support library later than version 19:

It's important to note thatSwiperefreshlayout is supported in the Android 4.4.2 (API 19) version, so the minimum version is 19 after the project is under construction.

First look at the effect:

And then I went straight to the code. [The use of the image can download the source code, images are included in the inside]

Layout file (XML) [Activity_main.xml]:

There's a ListView inside, and there's nothing else to spare.

<android.support.v4.widget.swiperefreshlayout    xmlns:android= "http://schemas.android.com/apk/res/android "    android:id=" @+id/swipecontainer "    android:layout_width=" match_parent "    android:layout_height=" Match_parent ">    <listview        android:layout_margintop=" 30DP "        android:id=" @+id/list_view        " Android:layout_width= "Match_parent"        android:layout_height= "wrap_content"        android:layout_ Alignparentleft= "true"        android:layout_alignparenttop= "true" >    </listview></ Android.support.v4.widget.swiperefreshlayout>

Mainactivity Code:

Package Com.demo.mummyding.learnswiperefreshlayout;import Android.app.activity;import Android.os.Handler;import Android.support.v4.widget.swiperefreshlayout;import Android.support.v7.app.actionbaractivity;import Android.os.bundle;import Android.util.log;import Android.view.menu;import Android.view.menuitem;import Android.widget.arrayadapter;import Android.widget.listview;import Android.widget.toast;import Org.json.JSONArray; Import Java.util.arraylist;import java.util.list;/** * Here to implement Onrefreshlistener interface */public class Mainactivity extends Act    Ivity implements swiperefreshlayout.onrefreshlistener{private Swiperefreshlayout Swipecontainer;    ListView ListView;    List<viewitem> list;    Itemadapter adapter;        @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);        Setcontentview (R.layout.activity_main);    Init ();         }/** * Down refresh will trigger execution of this method */@Override public void Onrefresh () {/*** with Handler (). postdelayed deferred execution * Of course, no delay can also, I am here to see the effect, because here the refresh of a bit on the ~ * * * New Handler (). postdelayed (n                 EW Runnable () {@Override public void run () {list.clear ();                 Additems ();                 Adapter.notifydatasetchanged ();             Swipecontainer.setrefreshing (FALSE);        }}, 1000);                 /* No delay can be written directly as follows */* * list.clear ();                 Additems ();                 Adapter.notifydatasetchanged ();                 Swipecontainer.setrefreshing (FALSE);        */}/** * Initialize variable & Add Event listener */void Init () {listview = (ListView) Findviewbyid (R.id.list_view);        Swipecontainer = (swiperefreshlayout) Findviewbyid (R.id.swipecontainer);        Swipecontainer.setonrefreshlistener (this);        List = new arraylist<viewitem> ();        adapter = new Itemadapter (this,r.layout.view_layout,list); Listview.setadapter (AdaptER); }/** * Add item to the ListView the following item can be copied several times ~_~ */void Additems () {ViewItem AddItem = new ViewItem ("Aaro        n ");        List.add (AddItem);        AddItem = new ViewItem ("Barton");        List.add (AddItem);        AddItem = new ViewItem ("Beacher");        List.add (AddItem);        AddItem = new ViewItem ("Colbert");        List.add (AddItem);        AddItem = new ViewItem ("Dick");        List.add (AddItem);        AddItem = new ViewItem ("Gregary");        List.add (AddItem);        AddItem = new ViewItem ("Francis");        List.add (AddItem);        AddItem = new ViewItem ("Fitch");        List.add (AddItem);        AddItem = new ViewItem ("Gordon");        List.add (AddItem);        AddItem = new ViewItem ("Eugene");        List.add (AddItem);        AddItem = new ViewItem ("Gregary");        List.add (AddItem);        AddItem = new ViewItem ("Francis");        List.add (AddItem);        AddItem = new ViewItem ("Fitch");        List.add (AddItem); AddItem = new ViewItem ("GoRdon ");        List.add (AddItem);        AddItem = new ViewItem ("Eugene");        List.add (AddItem);        AddItem = new ViewItem ("Gregary");        List.add (AddItem);        AddItem = new ViewItem ("Francis");        List.add (AddItem);        AddItem = new ViewItem ("Fitch");        List.add (AddItem);        AddItem = new ViewItem ("Gordon");        List.add (AddItem);        AddItem = new ViewItem ("Eugene");        List.add (AddItem);        AddItem = new ViewItem ("Gregary");        List.add (AddItem);        AddItem = new ViewItem ("Francis");        List.add (AddItem);        AddItem = new ViewItem ("Fitch");        List.add (AddItem);        AddItem = new ViewItem ("Gordon");        List.add (AddItem);        AddItem = new ViewItem ("Eugene");        List.add (AddItem);        AddItem = new ViewItem ("Gregary");        List.add (AddItem);        AddItem = new ViewItem ("Francis");        List.add (AddItem);        AddItem = new ViewItem ("Fitch");        List.add (AddItem); AddItem = new ViewItem ("Gordon");        List.add (AddItem);        AddItem = new ViewItem ("Eugene");        List.add (AddItem);        AddItem = new ViewItem ("Gregary");        List.add (AddItem);        AddItem = new ViewItem ("Francis");        List.add (AddItem);        AddItem = new ViewItem ("Fitch");        List.add (AddItem);        AddItem = new ViewItem ("Gordon");        List.add (AddItem);        AddItem = new ViewItem ("Eugene");        List.add (AddItem); }}

Next is the two class item class and the adapter class [which belongs to the basic usage of the ListView].

Package com.demo.mummyding.learnswiperefreshlayout;/** * Created by mummyding on 15-7-20. */public class ViewItem {    private String itemname;    Public String Getitemname () {        return itemname;    }    Public ViewItem (String itemname) {        this.itemname = ItemName;    }}

Package Com.demo.mummyding.learnswiperefreshlayout;import Android.content.context;import android.text.Layout; Import Android.view.layoutinflater;import Android.view.view;import Android.view.viewgroup;import Android.widget.arrayadapter;import android.widget.textview;import java.util.list;/** * Created by mummyding on 15-7-20. */public class Itemadapter extends arrayadapter<viewitem> {public Itemadapter (context context, int Reso    Urce, list<viewitem> objects) {Super (context, resource, objects);        } @Override public view getView (int position, view Convertview, ViewGroup parent) {view view;        Viewholder Viewholder;        ViewItem item = getItem (position);            if (Convertview = = null) {view = Layoutinflater.from (GetContext ()). Inflate (r.layout.view_layout, NULL);            Viewholder = new Viewholder ();            Viewholder.name = (TextView) View.findviewbyid (r.id.tv_name);        ViewHolder.name.setText (Item.getitemname ());    View.settag (Viewholder);            }else{view = Convertview;            Viewholder = (Viewholder) convertview.gettag ();        ViewHolder.name.setText (Item.getitemname ());    } return view;     /** * An auxiliary class added to reduce the number of Findviewbyid calls in the GetView method.    */class viewholder{TextView name; }}

Finally, there is a local file for item view [View_layout.xml]

<?xml version= "1.0" encoding= "Utf-8"? ><linearlayout xmlns:android= "http://schemas.android.com/apk/res/ Android "    android:layout_width=" match_parent "android:layout_height=" match_parent ">    < Relativelayout        android:layout_width= "match_parent"        android:layout_height= "wrap_content" >        < ImageView            android:id= "@+id/iv_uers"            android:layout_width= "60DP"            android:layout_height= "50DP"            android:layout_marginleft= "10DP"            android:background= "@drawable/user"            />        <textview            Android:id= "@+id/tv_name"            android:layout_width= "match_parent"            android:layout_height= "Wrap_content"            android:layout_torightof= "@+id/iv_uers"            android:gravity= "center"            android:layout_centerinparent = "true"            />    </RelativeLayout></LinearLayout>

Complete code: Https://github.com/MummyDing/SwipeRefreshLayout

"Reprint Please specify the source"

Author:mummyding

Source: http://blog.csdn.net/mummyding/article/category/5651761

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

"Android" uses swiperefreshlayout to implement a pull-down refresh