Creating a ContextMenu on a ListView

layout中的main.xml

XML:

<?xml version ="1.0" encoding ="utf-8" ?>
<LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
android:orientation ="vertical"
android:layout_width ="fill_parent"
android:layout_height ="fill_parent" >
<TextView
   android:layout_width ="fill_parent"
   android:layout_height ="wrap_content"
   android:text ="Long-Press on of the Items in the list." />
<ListView android:id ="@+id/list_favorites"
   android:layout_width ="fill_parent"
   android:layout_height ="fill_parent" />
</LinearLayout>

源代码是：

package com.gggeye.study;import java.util.ArrayList;import android.app.Activity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.MenuItem;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.View.OnCreateContextMenuListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;public class ContextMenuSample extends Activity {// ===========================================================// Final Fields// ===========================================================protected static final int CONTEXTMENU_DELETEITEM = 0;// ===========================================================// Fields// ===========================================================protected ListView mFavList;protected ArrayList<Favorite> fakeFavs = new ArrayList<Favorite>();// ===========================================================// "Constructors"// ===========================================================/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle icicle) {super.onCreate(icicle);setContentView(R.layout.main);/* Add some items to the list the listview will be showing. */fakeFavs.add(new Favorite("John", "nice guy"));fakeFavs.add(new Favorite("Yasmin", "hot girl"));fakeFavs.add(new Favorite("Jack", "cool guy"));this.mFavList = (ListView) this.findViewById(R.id.list_favorites);initListView();}private void refreshFavListItems() {mFavList.setAdapter(new ArrayAdapter<Favorite>(this,android.R.layout.simple_list_item_1, fakeFavs));}private void initListView() {/* Loads the items to the ListView. */refreshFavListItems();/* Add Context-Menu listener to the ListView. */mFavList.setOnCreateContextMenuListener(new OnCreateContextMenuListener() {public void onCreateContextMenu(ContextMenu conMenu, View view , ContextMenuInfo info) {conMenu.setHeaderTitle("ContextMenu");conMenu.add(0, 0, 0, "Delete this favorite!");/* Add as many context-menu-options as you want to. */}});}// ===========================================================// Methods from SuperClass/Interfaces// ===========================================================@Overridepublic boolean onContextItemSelected(MenuItem aItem) {ContextMenuInfo menuInfo = (ContextMenuInfo) aItem.getMenuInfo();/* Switch on the ID of the item, to get what the user selected. */switch (aItem.getItemId()) {case CONTEXTMENU_DELETEITEM:/* Get the selected item out of the Adapter by its position. */Favorite favContexted = (Favorite) mFavList.getAdapter().getItem(0);/* Remove it from the list.*/fakeFavs.remove(favContexted);refreshFavListItems();return true; /* true means: "we handled the event". */}return false;}// ===========================================================// Inner and Anonymous Classes// ===========================================================/** Small class holding some basic */protected class Favorite {protected String name;protected String kindness;protected Favorite(String name, String kindness) {this.name = name;this.kindness = kindness;}/** The ListView is going to display the toString() return-value! */public String toString() {return name + " (" + kindness + ")";}public boolean equals(Object o) {return o instanceof Favorite && ((Favorite) o).name.compareTo(name) == 0;}}
}

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