4.4.6 Context菜单
Android的Context Menu基本上与Windows系统的右键菜单等同。如果Context Menu已经注册到视图（View）上了，那么在屏幕长按（大约2秒钟）就会弹出Context菜单。
修改activity_main.xml文件
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <ListView android:id="@+id/list01" android:layout_width="fill_parent" android:layout_height="0px" android:layout_weight="1"/> <TextView android:id="@+id/footer" android:layout_width="fill_parent" android:layout_height="60dp" android:padding="4dp" android:background="#FF666666" android:text="@string/footer" /></LinearLayout>
新建ListView的单项Layout文件listitem.xml
<?xml version="1.0" encoding="utf-8"?><TextView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:textSize="24dip" android:padding="8dip" />
然后，我们来编写代码。
在编写ContextMenu时必须实现onCreateContextMenu()。执行点击事件由onContextItemSelected()实现。
代码：
package com.example.testmenu;import android.os.Bundle;import android.app.Activity;import android.view.ContextMenu;import android.view.Menu;import android.view.MenuInflater;import android.view.MenuItem;import android.view.View;import android.view.ContextMenu.ContextMenuInfo;import android.widget.AdapterView;import android.widget.AdapterView.AdapterContextMenuInfo;import android.widget.ArrayAdapter;import android.widget.ListView;import android.widget.TextView;public class MainActivity extends Activity { private static final int MENU_FILE_1 = Menu.FIRST; private static final int MENU_EXIT_2 = Menu.FIRST + 1; private static final int MENU_EDIT_3 = Menu.FIRST + 2; private static final int MENU_DELETE = Menu.FIRST + 3; String[] phones = { "HTC Rezound", "Samsung Galaxy S II Skyrocket", "Samsung Galaxy Nexus", "Motorola Droid Razr", "Samsung Galaxy S", "Samsung Epic Touch 4G", "iPhone 4S", "HTC Titan" }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ListView listView = (ListView) findViewById(R.id.list01); ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.listitem, phones); listView.setAdapter(adapter); registerForContextMenu(listView); } @Override public boolean onCreateOptionsMenu(Menu menu) { //getMenuInflater().inflate(R.menu.activity_main, menu); MenuInflater menuInflater = getMenuInflater(); menuInflater.inflate(R.menu.my_menu, menu); return true; } @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { // TODO Auto-generated method stub if (v.getId() == R.id.list01) { AdapterView.AdapterContextMenuInfo info = (AdapterContextMenuInfo) menuInfo; menu.setHeaderTitle(phones[info.position]); menu.add(0, MENU_EDIT_3, 0, R.string.edit); menu.add(0, MENU_DELETE, 0, R.string.delete); } } @Override public boolean onContextItemSelected(MenuItem item) { // TODO Auto-generated method stub TextView text = (TextView) findViewById(R.id.footer); switch (item.getItemId()) { case MENU_EDIT_3: text.setText("Edit Selected"); return true; case MENU_DELETE: text.setText("Delete Selected"); return true; default: return super.onContextItemSelected(item); } } @Override public boolean onOptionsItemSelected(MenuItem item) { // TODO Auto-generated method stub switch (item.getItemId()) { case MENU_FILE_1: fileMenu(); break; case MENU_EXIT_2: exitMenu(); break; default: break; } return false; } private void fileMenu() { // TODO My-generated method stub } private void exitMenu() { // TODO My-generated method stub } }运行效果：
