Android學習筆記之ContextualMenu操作功能表用於長按事件的確定，contextual

Android學習筆記之ContextualMenu操作功能表用於長按事件的確定，contextual

（1）在布局檔案中建立一個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目錄下的main.xml檔案：

<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檔案：

<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）類檔案：

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;/** * 操作功能表適用於listview或者gridview，還必須是長按的時候才會顯示 *  * @author piaodangdehun *  */public class MainActivity extends Activity {private ListView listView;private ArrayAdapter<String> arrayAdapter; // 適配器用於給listview添加資料@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);// 註冊一個contextualMenu操作功能表registerForContextMenu(listView);}/* * 添加一個操作功能表 */@Overridepublic void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo) {// TODO Auto-generated method stubgetMenuInflater().inflate(R.menu.main, menu);super.onCreateContextMenu(menu, v, menuInfo);}/* * 為適配器添加數值 */public List<String> getData() {List<String> list = new ArrayList<String>();for (int i = 0; i < 10; i++) {list.add("jack" + i);}return list;}/* * 操作功能表的設定 */@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);}/* * 這是系統內建的menu、注釋掉再點擊菜單的時候就不會顯示系統的菜單 *  * @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; } */}

必須長按選項才會彈出對話方塊以供操作