Custom drop-down style spinner in Android

Custom drop-down style spinner in Android

This article continues with the introduction of the Android custom control family, customizing the use of the Spinner control.

Implementation ideas

1. Define the drop-down control layout (ListView and child control layouts)

2. Customizing the Spinerpopwindow class

3. Define the adapter of the fill data

I. Defining the layout of controls

<?xml version= "1.0" encoding= "Utf-8"? ><relativelayout xmlns:android= "http://schemas.android.com/apk/res/    Android "Android:layout_width=" Match_parent "android:layout_height=" match_parent "android:background=" #f2f2f2 " android:orientation= "vertical" android:padding= "5DP" > <linearlayout android:id= "@+id/layout" a Ndroid:layout_width= "Match_parent" android:layout_height= "wrap_content" android:layout_margin= "5DP" a Ndroid:background= "#cbcbcb" android:orientation= "vertical" android:padding= "0.2px" > <relativel                Ayout android:layout_width= "wrap_content" android:layout_height= "42DP" > <textview Android:id= "@+id/tv_value" android:layout_width= "Match_parent" android:layout _height= "Match_parent" android:layout_centervertical= "true" android:layout_marginright= "50DP "Android:backgrouNd= "#fff" android:ellipsize= "End" android:gravity= "Left|center" android:hint= "Please select" android:paddingleft= "10DP" android:singleline= "true" android:textcolor=                "#ff000000" android:textsize= "18DP" > </TextView> <linearlayout Android:id= "@+id/bt_dropdown" android:layout_width= "50DP" android:layout_height= "match _parent "android:layout_alignparentright=" true "android:background=" #fff "and" roid:gravity= "center" android:onclick= "OnClick" > <imageview androi D:layout_width= "20DP" android:layout_height= "15DP" android:background= "@drawable/dow N_arrow "/> </LinearLayout> </RelativeLayout> </linearlayout></relativelayout >

Second, define the Spinerpopwindow class

Package Org.gaochun.widget;import Java.util.list;import Org.gaochun.r;import org.gaochun.adapter.SpinerAdapter; Import Org.gaochun.adapter.spineradapter.ionitemselectlistener;import Android.content.context;import Android.graphics.drawable.colordrawable;import Android.view.layoutinflater;import Android.view.View;import Android.view.viewgroup.layoutparams;import Android.widget.adapterview;import Android.widget.adapterview.onitemclicklistener;import Android.widget.listview;import Android.widget.PopupWindow /** * Custom Spinerpopwindow class * @author Gao_chun * */public class Spinerpopwindow extends Popupwindow implements Onitemclickl    istener{private Context Mcontext;    Private ListView Mlistview;    Private Spineradapter Madapter;    Private Ionitemselectlistener Mitemselectlistener;        Public Spinerpopwindow (Context context) {super (context);        Mcontext = context;    Init (); } public void Setitemlistener (Ionitemselectlistener listener) {Mitemselectlistener = LiStener;        } public void Setadatper (Spineradapter adapter) {Madapter = adapter;    Mlistview.setadapter (Madapter); } private void Init () {View view = Layoutinflater.from (Mcontext). Inflate (R.layout.spiner_window_layout, NULL        );        Setcontentview (view);        SetWidth (layoutparams.wrap_content);        SetHeight (layoutparams.wrap_content);        Setfocusable (TRUE);        Colordrawable DW = new colordrawable (0x00);        Setbackgrounddrawable (DW);        Mlistview = (ListView) View.findviewbyid (R.id.listview);    Mlistview.setonitemclicklistener (this); } public void RefreshData (list<string> list, int selindex) {if (list! = NULL && selindex! =-            1) {if (madapter! = null) {Madapter.refreshdata (list, selindex);        }}} @Override public void Onitemclick (adapterview<?> arg0, view view, int pos, long arg3) {        Dismiss (); if (Mitemselectlistener! = NULL) {Mitemselectlistener.onitemclick (POS); }    }}

iii. definition of Adapter

Package Org.gaochun.adapter;import Java.util.list;import Org.gaochun.r;import android.content.context;import Android.view.layoutinflater;import Android.view.view;import Android.view.viewgroup;import Android.widget.baseadapter;import Android.widget.textview;public class Spineradapter extends BaseAdapter {public stat    IC interface ionitemselectlistener{public void Onitemclick (int pos);    };    Private list<string> mobjects;    Private Layoutinflater Minflater;        Public Spineradapter (Context context,list<string> mobjects) {this.mobjects = mobjects;    Minflater = (layoutinflater) context.getsystemservice (Context.layout_inflater_service);        } public void RefreshData (list<string> objects, int selindex) {mobjects = objects;        if (Selindex < 0) {Selindex = 0;        } if (Selindex >= mobjects.size ()) {Selindex = Mobjects.size ()-1; }} @Override public int getcount () {return mObJects.size ();    } @Override public Object getItem (int pos) {return Mobjects.get (POS). toString ();    } @Override public long getitemid (int pos) {return pos;        } @Override public View getView (int pos, View convertview, ViewGroup arg2) {Viewholder viewholder;            if (Convertview = = null) {Convertview = minflater.inflate (r.layout.spiner_item_layout, NULL);            Viewholder = new Viewholder ();            Viewholder.mtextview = (TextView) Convertview.findviewbyid (R.id.textview);        Convertview.settag (Viewholder);        } else {Viewholder = (Viewholder) convertview.gettag ();        }//object item = GetItem (POS);        ViewHolder.mTextView.setText (Mobjects.get (POS));    return convertview;    } public static class Viewholder {public TextView mtextview; }}

Iv. Invocation of the sample

public class Mainactivity extends Activity implements onclicklistener,spineradapter.ionitemselectlistener{private Lis  t<string> Mlisttype = new arraylist<string> ();    Type list private TextView Mtview;    Private Spineradapter Madapter;        @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);        Setcontentview (R.layout.activity_search);        Mtview = (TextView) Findviewbyid (R.id.tv_value);        Initialize data string[] names = Getresources (). Getstringarray (R.array.array_name);        for (int i = 0; i < names.length; i++) {Mlisttype.add (names[i]);        } madapter = new Spineradapter (this,mlisttype);        Madapter.refreshdata (mlisttype,0);        Displays the first Data//mtview.settext (Names[0]);        Initialize Popwindow Mspinerpopwindow = new Spinerpopwindow (this);        Mspinerpopwindow.setadatper (Madapter);    Mspinerpopwindow.setitemlistener (this); }//Set Popwindow private Spinerpopwindow Mspinerpopwindow;        private void Showspinwindow () {LOG.E ("", "Showspinwindow");        Mspinerpopwindow.setwidth (Mtview.getwidth ());    Mspinerpopwindow.showasdropdown (Mtview);                } @Override public void OnClick (View v) {switch (V.getid ()) {r.id.bt_dropdown:                Showspinwindow ();        Break }//* (non-javadoc) * @see org.gaochun.adapter.spineradapter.ionitemselectlistener#onitemclick (int) */@  Override public void Onitemclick (int pos) {//TODO auto-generated Method stub if (pos >= 0 &&            POS <= mlisttype.size ()) {String value = Mlisttype.get (POS);        Mtview.settext (Value.tostring ()); }    }}

Source Download: http://download.csdn.net/download/gao_chun/8653069

Five, custom control series

using custom progress Loading in Android Projects dialog:http://blog.csdn.net/gao_chun/article/details/45270031

button Listener Setup and optimization in ListView:http://blog.csdn.net/gao_chun/article/details/41249131

Custom top title bar in Android Project:http://blog.csdn.net/gao_chun/article/details/45255929

Android Custom settings round picture control:http://blog.csdn.net/gao_chun/article/details/39207557

Android Custom Bottom tab, project overall interface frame:http://blog.csdn.net/gao_chun/article/details/37903673

Custom Alertdialog Prompt box: http://blog.csdn.net/gao_chun/article/details/37757571

Reproduced in the source.

Custom drop-down style spinner in Android