Custom Control---System control combination (case three)

As follows

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Activity_main.xml

<relativelayout xmlns:android= "http://schemas.android.com/apk/res/android"    xmlns:tools= "http// Schemas.android.com/tools "    android:layout_width=" match_parent "    android:layout_height=" Match_parent "    tools:context= ". Mainactivity ">    <edittext        android:id=" @+id/edittext1 "        android:layout_width=" 200dip "        android:layout_height= "Wrap_content"        android:layout_centerhorizontal= "true"        android:hint= "Please enter text"        Android:singleline= "true"/>    <imageview        android:id= "@+id/iv_down_arrow"        android:layout_ Width= "Wrap_content"        android:layout_height= "wrap_content"        android:layout_aligntop= "@+id/editText1"        android:layout_alignright= "@+id/edittext1"        android:src= "@drawable/down_arrow"/></ Relativelayout>

Popupwindow_item.xml

<?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=" wrap_content "> <imageview Andro        Id:layout_width= "Wrap_content" android:layout_height= "Wrap_content" android:layout_centervertical= "true"        android:padding= "5dip" android:src= "@drawable/user"/> <textview android:id= "@+id/tv_msg" Android:layout_width= "Wrap_content" android:layout_height= "Wrap_content" android:layout_centerhorizontal= "        True "android:layout_centervertical=" true "android:text=" aaaaaaaa0 "android:textcolor=" #000000 " Android:textsize= "18sp"/> <imageview android:id= "@+id/iv_delete" android:layout_width= "Wrap_cont Ent "android:layout_height=" Wrap_content "android:layout_alignparentright=" true "Android:layout_cente Rvertical= "true" android:padding= "10dip" android:src= "@drawable/delete"/></relativelayout> 

Mainactivity.java

Package Com.atguigu.downarrow;import Java.util.arraylist;import Android.app.activity;import android.os.Bundle; Import Android.view.view;import Android.view.view.onclicklistener;import Android.view.viewgroup;import Android.widget.adapterview;import Android.widget.adapterview.onitemclicklistener;import Android.widget.baseadapter;import Android.widget.edittext;import Android.widget.imageview;import Android.widget.listview;import Android.widget.popupwindow;import Android.widget.textview;public class MainActivity Extends Activity {private EditText edittext1;private ImageView iv_down_arrow;private Popupwindow window;// Custom Listviewprivate ListView listview;//data Private arraylist<string> msgs; @Overrideprotected void OnCreate ( Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (r.layout.activity_main); editText1 = (EditText) Findviewbyid (R.ID.EDITTEXT1); iv_down_arrow = (ImageView) Findviewbyid (r.id.iv_down_arrow);// Set Click event-Eject Popuwindowiv_down_arrow.setonclicklistener (mClicklistener);//Prepare data msgs = new arraylist<string> (); for (int i =0;i<200;i++) {msgs.add ("aaaaaaaaaaa" +i);} Instantiate listview ListView = New ListView (this);//9patch picture Listview.setbackgroundresource (r.drawable.listview_ background);//Create and set adapter Myadaper adapter = new Myadaper (); Listview.setadapter (adapter);// Set click on a Listview.setonitemclicklistener (new Onitemclicklistener () {@Overridepublic void Onitemclick (adapterview< ?> parent, View view,int position, long id) {//1. Gets the content string msg = Msgs.get (position);//2. Set into the input box Edittext1.settext ( msg);//If you try to be not empty and try to be in the display state if (window!= null&&window.isshowing ()) {Window.dismiss ();//release resource window = NULL;}});} Private Onclicklistener Mclicklistener = new Onclicklistener () {@Overridepublic void OnClick (View v) {switch (V.getid ()) { Case r.id.iv_down_arrow://down arrow if (window = = null) {window = new Popupwindow (mainactivity.this); Window.setwidth ( Edittext1.getwidth ()); Window.setheight (n);//todo the ListView has not yet been created, one will come to continue this place to write code Window.setcontentview (ListView) ;//Set FocusWindow.setfocusable (TRUE);} Window.showasdropdown (editText1, 0, 0); break;default:break;}}};/ * * Create adapter */class myadaper extends baseadapter{@Overridepublic int GetCount () {return msgs.size ();} @Overridepublic Object getItem (int position) {return msgs.get (position);} @Overridepublic long Getitemid (int position) {return 0;} @Overridepublic view GetView (int position, view Convertview, ViewGroup parent) {//Eventually return a viewview View; Viewholder holder;if (Convertview! = null) {view = Convertview;holder = (viewholder) View.gettag ();} else{//the layout file--->view object View = View.inflate (mainactivity.this, r.layout.popupwindow_item, null); holder = new Viewholder (); holder.tv_msg = (TextView) View.findviewbyid (r.id.tv_msg); holder.iv_delete = (ImageView) View.findviewbyid (r.id.iv_delete);//associated View.settag (holder);} The corresponding data is obtained based on the position of the final String msg = msgs.get (position); Holder.tv_msg.setText (msg); Holder.iv_delete.setOnClickListener ( New Onclicklistener () {@Overridepublic void OnClick (View v) {//1. Msgs.remove (msg) removed from the list;//2. BrushNew display notifydatasetchanged ();}}); return view;}} Static class Viewholder{textview Tv_msg;imageview Iv_delete;}}

Custom Control---System control combination (case three)