Android--ListView (simpleadapter) custom Adapter

Source: Internet
Author: User

2. Code

Mainactivity

  

Package Com.himi;import Java.util.arraylist;import java.util.hashmap;import java.util.list;import java.util.Map; Import Android.app.activity;import android.os.bundle;import android.view.view;import Android.widget.AdapterView; Import Android.widget.adapterview.onitemclicklistener;import Android.widget.listview;import Android.widget.simpleadapter;import Android.widget.toast;public class Mainactivity extends Activity {private Simpleadapter adapter;//declaration Adapter Object Private ListView ListView; Declaring list View objects private List < Map < String, object >> list;//Declaration list container public static mainactivity ma;@ Overridepubli c void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); ma = this;//instantiation list container, List = new Arrayl Ist < Map < string, Object >> (); listview = new ListView (this);//Instantiate list view//instance a list data container Map < String, O Bject > Map = new HashMap < String, Object > ();//Add Data map.put to the list container ("Item1_imageivew", R.drawable.icon); ma P.put ("Item1_bigtv", "BIGTV "), Map.put (" Item1_smalltv "," SMALLTV ");//Add list data to the list container list.add (map);//use Android to provide the Simpleadapter adapter, can not implement component monitoring; /adapter = new Simpleadapter (this, list, r.layout.main,//new string[] {"Item1_imageivew", "Item1_bigtv", "ITEM1_SMALLTV "},//new int[] {r.id.iv, R.ID.BIGTV, R.ID.SMALLTV});//--use a custom adapter to listen for event monitoring of each item in its listview mysimpleadapter adapter = new My Simpleadapter (this, list, R.lay                                                            Out.main, New String [] {                                                            "Item1_imageivew", "ITEM1_BIGTV",                              "Item1_smalltv"},                          new int [] {R.ID.IV,                                   R.ID.BIGTV, R.ID.SMALLTV  });//set Adapter for List view (map data to List view) Listview.setadapter (adapter); Listview.setonitemclicklistener (                              New Onitemclicklistener () {@ overridepublic void Onitemclick (Adapterview <? > Parent, View view, int position, long ID) {//TODO Auto-generat                                                            Ed Method Stubtoast.maketext (Mainactivity.this, "You clicked on the first:"                              + Position + "items", Toast.length_short). Show ();}} )////Display list view This.setcontentview (ListView);}}

 mysimpleadapter

Package Com.himi;import Java.util.list;import Java.util.map;import android.app.alertdialog;import Android.content.context;import Android.view.layoutinflater;import Android.view.view;import Android.view.ViewGroup ; Import Android.widget.baseadapter;import Android.widget.button;import Android.widget.checkbox;import Android.widget.compoundbutton;import Android.widget.imageview;import Android.widget.textview;import Android.widget.compoundbutton.oncheckedchangelistener;public class Mysimpleadapter extends BaseAdapter {// Declares a Layoutinflater object (which is used to instantiate the layout) private Layoutinflater minflater;private List < Map < String, Object >> lis t;//Declaration list container Object private int layoutid; Declare layout idprivate String flag[];//Declare all components in a ListView item map index private INT itemids[];//Declaration ListView Item All component ID array public               Mysimpleadapter (Context context, List < Map < String, Object >> list, int LayoutID, String flag[], int itemids[]) {//Use construct to instantiate member variable object this.minflater = LayoutinflaTer.from (context); this.list = List;this.layoutid = Layoutid;this.flag = Flag;this. Itemids = Itemids;} @ overridepublic int GetCount () {return list.size ();//Returns the length of a ListView item}@ overridepublic Object getItem (int arg0) {RET Urn 0;} @ overridepublic long getitemid (int arg0) {return 0;} Instantiate layout and components and set component data//getview (int position, View Convertview, ViewGroup Parent)//First parameter: Number of lines plotted//                              Second argument: The drawing view here refers to the layout of each item in the ListView//Third parameter: View collection, which does not require @ overridepublic view GetView (int position, view Convertview,  ViewGroup parent) {//to instantiate the layout through the Minflater object as a Viewconvertview = Minflater.inflate (LayoutID, NULL  ); for (int i = 0; i < flag.length; i + +) {//traverse all components of each item//each component to make a matching decision to get the correct type of the component if (Convertview.findviewbyid (itemids [i]) instanceof ImageView) {//findviewbyid () function is instantiating a component in a layout//when the component is a ImageView type, it instantiates a ImageView object ImageView IV = (Image View) Convertview. Findviewbyid (Itemids [i]);//Set data Iv.setbackgroundresource for its components (Int Eger) LisT. Get (position). Get (flag [i]));}  else if (Convertview.findviewbyid (itemids [i]) instanceof TextView) {//When the component is of type TextView, instantiate a TextView object for it TextView TV = (TextView) Convertview. Findviewbyid (Itemids [i]);//Set data for its components Tv.settext ((String) L Ist.get (position). Get (flag [i]));}} Sets the listener for the button (button) Convertview.findviewbyid (R.ID.BTN)). Setonclicklistener (new View). Onclicklistener () {@ Override public void OnClick (View v)                                                            {//Here a dialog box pops up, followed by a detailed narration of new Alertdialog.builder ( MAINACTIVITY.MA). s                                  Ettitle ("Custom Simpleadapter")                          The. Setmessage ("button successfully triggers the Listener event!                              "). Show ();                              });//Set the Listener ((checkbox) Convertview.findviewbyid (R.ID.CB)) for the check box                              . Setoncheckedchangelistener (New Oncheckedchangelistener () {@ Override public void OnCheckedChanged (Compoundbutton                              Buttonview, Boolean isChecked) {                                                            A dialog box pops up, followed by a detailed narration of new Alertdialog.builder (                                                             mainactivity.ma). Settitle ("Custom Simpleadapter") . Setmessage ("checkbox successfully triggered status Change listener event!              " )                                              . Show (); }}); return convertview;}}

 layout

<?xml version= "1.0" encoding= "Utf-8"? ><linearlayout xmlns:android= "http://schemas.android.com/apk/res/ Android "Android:layout_width=" Fill_parent "android:layout_height=" fill_parent "android:orientation=" Horizontal " > <imageview android:id= "@+id/iv" android:layout_width= "Wrap_content" android:layout_height= "Wrap_content"/> <linearlayout android:layout_width= "wrap_content" android:layout_height= "Wrap_con Tent "android:orientation=" vertical "> <textview android:id=" @+id/bigtv "Android        : layout_width= "wrap_content" android:layout_height= "wrap_content" android:textsize= "20sp"/> <textview android:id= "@+id/smalltv" android:layout_width= "Wrap_content" Android:lay out_height= "Wrap_content" android:textsize= "10sp"/> </LinearLayout> <button android:i D= "@+id/btn" Android:layout_Width= "Wrap_content" android:layout_height= "Wrap_content" android:focusable= "false" android:text= "but Ton "/> <checkbox android:id=" @+id/cb "android:layout_width=" Wrap_content "android:layout_he ight= "Wrap_content" android:focusable= "false"/></linearlayout>

Android--ListView (simpleadapter) custom Adapter

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