Android学习笔记之ContextualMenu上下文菜单用于长按事件的确定

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（1）在布局文件中创建一个listview：

<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"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <ListView        android:id="@+id/listView1"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_alignParentLeft="true"        android:layout_alignParentTop="true" >    </ListView></RelativeLayout>

（1）在res--menu目录下的main.xml文件：

<menu xmlns:android="http://schemas.android.com/apk/res/android" >    <item        android:id="@+id/edit"        android:orderInCategory="100"        android:showAsAction="never"        android:title="@string/edit"/>    <item        android:id="@+id/share"        android:orderInCategory="100"        android:showAsAction="never"        android:title="@string/share"/>    <item        android:id="@+id/delete"        android:orderInCategory="100"        android:showAsAction="never"        android:title="@string/delete"/></menu>

（3）string.xml文件：

<menu xmlns:android="http://schemas.android.com/apk/res/android" >    <item        android:id="@+id/edit"        android:orderInCategory="100"        android:showAsAction="never"        android:title="@string/edit"/>    <item        android:id="@+id/share"        android:orderInCategory="100"        android:showAsAction="never"        android:title="@string/share"/>    <item        android:id="@+id/delete"        android:orderInCategory="100"        android:showAsAction="never"        android:title="@string/delete"/></menu>

（4）类文件：

package com.example.menu_contextualmenu;import java.util.ArrayList;import java.util.List;import android.os.Bundle;import android.app.Activity;import android.view.ContextMenu;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.ContextMenu.ContextMenuInfo;import android.widget.ArrayAdapter;import android.widget.ListView;import android.widget.AdapterView.AdapterContextMenuInfo;import android.widget.Toast;/** * 上下文菜单适用于listview或者gridview，还必须是长按的时候才会显示 *  * @author piaodangdehun *  */public class MainActivity extends Activity {private ListView listView;private ArrayAdapter<String> arrayAdapter; // 适配器用于给listview添加数据@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);listView = (ListView) this.findViewById(R.id.listView1);arrayAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_expandable_list_item_1, getData());listView.setAdapter(arrayAdapter);// 注册一个contextualMenu上下文菜单registerForContextMenu(listView);}/* * 添加一个上下文菜单 */@Overridepublic void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo) {// TODO Auto-generated method stubgetMenuInflater().inflate(R.menu.main, menu);super.onCreateContextMenu(menu, v, menuInfo);}/* * 为适配器添加数值 */public List<String> getData() {List<String> list = new ArrayList<String>();for (int i = 0; i < 10; i++) {list.add("jack" + i);}return list;}/* * 上下文菜单的设置 */@Overridepublic boolean onContextItemSelected(MenuItem item) {// TODO Auto-generated method stubAdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();switch (item.getItemId()) {case R.id.edit:String value = arrayAdapter.getItem(info.position);Toast.makeText(MainActivity.this, "edit...." + value,Toast.LENGTH_SHORT).show();break;case R.id.delete:Toast.makeText(MainActivity.this, "delete....", Toast.LENGTH_SHORT).show();break;default:break;}return super.onContextItemSelected(item);}/* * 这是系统自带的menu、注释掉再点击菜单的时候就不会显示系统的菜单 *  * @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the * menu; this adds items to the action bar if it is present. * getMenuInflater().inflate(R.menu.main, menu); return true; } */}

必须长按选项才会弹出对话框以供操作

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