Recyclerview analysis of new Android control and pull-up and pull-down refresh

Overview:

Recyclerview is a new Widgets,recyclerview in the android-support-v7-21 version, which is a more advanced and flexible version of the ListView. In future development we will be able to replace the ListView directly with Recyclerview.

Feature Introduction:

1. Can be displayed horizontally

2. Eliminate dislocation problems

3. Standardization of Viewholder

Landscape:

private void Inithorizaontal (list<itemmodel> models) {Recyclerview Recyclerview = (recyclerview) Findviewbyid ( R.id.activity_main_horizontal_recyclerview); Linearlayoutmanager LayoutManager = new Linearlayoutmanager (mainactivity.this); Layoutmanager.setorientation ( Linearlayoutmanager.horizontal); Recyclerview.setlayoutmanager (LayoutManager); Recyclerviewadapter adapter = new Recyclerviewadapter (mainactivity.this, models); Recyclerview.setadapter (adapter);}

Vertical:

public void Initvertical (list<itemmodel> models) {Recyclerview Recyclerview = (recyclerview) Findviewbyid ( R.id.activity_main_vertical_recyclerview); Linearlayoutmanager LayoutManager = new Linearlayoutmanager (mainactivity.this); Layoutmanager.setorientation ( linearlayoutmanager.vertical); Recyclerview.setlayoutmanager (LayoutManager); Recyclerviewadapter adapter = new Recyclerviewadapter (mainactivity.this, models); Recyclerview.setadapter (adapter);}

Changes in adapter:

Google in the improvement of Recyclerview also for us to solve a beginner's headache problem: dislocation.

public class Recyclerviewadapter extends recyclerview.adapter<viewholder> {private list<itemmodel> mList = Null;private context Mcontext = null;private Layoutinflater minflater = null;public Recyclerviewadapter (context context, List<itemmodel> list) {Mcontext = Context;mlist = List;minflater = Layoutinflater.from (MContext);} @Overridepublic int GetItemCount () {if (mlist! = null) {return mlist.size ();} return 0;} @Overridepublic void Onbindviewholder (viewholder viewholder, int position) {((Itemviewholder) viewholder). Mlabeltextview.settext (Mlist.get (position). Getlabel ());} @Overridepublic viewholder Oncreateviewholder (viewgroup viewgroup, int arg1) {View view = Minflater.inflate ( R.layout.list_item, ViewGroup, false) Itemviewholder holder = new Itemviewholder (view); Holder.mlabeltextview = ( TextView) View.findviewbyid (R.id.list_item_textview); return holder;} public static class Itemviewholder extends viewholder{public itemviewholder (View Itemview) {Super (itEmview);    } private TextView mlabeltextview = null; }}

pull-up or drop-down refresh:

For the drop-down refresh, Android itself has a control swiperefreshlayout already implemented. We wrap the swiperefreshlayout outside the Recyclerview and then set it to bind to a onrefreshlistener.

layout:

<android.support.v4.widget.swiperefreshlayout    xmlns:android= "http://schemas.android.com/apk/res/android "    xmlns:tools=" Http://schemas.android.com/tools "    android:id=" @+id/swipe_refresh_widget "    android: Layout_width= "Match_parent"    android:layout_height= "match_parent" >    < Android.support.v7.widget.RecyclerView        android:id= "@android: Id/list"        android:layout_width= "Match_ Parent "        android:layout_height=" match_parent "        android:cachecolorhint=" @null "        android:scrollbars=" Vertical "/></android.support.v4.widget.swiperefreshlayout>

Monitoring:

@Override public    void Onrefresh () {        handler.sendemptymessagedelayed (0, +);    }

For the pull-up refresh, we are customizing a footerview and threads.

Mrecyclerview.setonscrolllistener (New Recyclerview.onscrolllistener () {            @Override public            Void Onscrollstatechanged (Recyclerview recyclerview,                    int newstate) {                super.onscrollstatechanged (RecyclerView, NewState);                if (newstate = = Recyclerview.scroll_state_idle && Lastvisibleitem + 1 = = Adapter.getitemcount ()) {                    Handler.sendemptymessagedelayed (1, +);                }            }            @Override public            void onscrolled (recyclerview recyclerview, int dx, int dy) {                super.onscrolled (Recyclerview, DX, dy);                Lastvisibleitem = Mlayoutmanager.findlastvisibleitemposition ();            }        });

related source Download:

Recyclerview Preliminary use

Recyclerview pull-up and drop-down refreshes

Recyclerview analysis of new Android control and pull-up and pull-down refresh