为ListView创建ContextMenu
ContextMenu称为上下文菜单，一般在控件上长按时弹出。今天我们学习ContextMenu的用法，这里与listview相结合，先在ListView显示几个Item,然后在Item上长按，弹出一个菜单（就是ContextMenu）,点击菜单上的项目，提示刚才长按的Item的Position。
main.xml文件
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical"><TextView android:id="@+id/text" android:text="zzz"android:textSize="18sp" android:textColor="#FFFFFF"android:layout_width="fill_parent" android:layout_height="wrap_content"/><ListView android:id="@+id/list"android:layout_width="fill_parent" android:layout_height="fill_parent"></ListView></LinearLayout>
package com.hello.menu;import android.app.Activity;import android.os.Bundle;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.AdapterContextMenuInfo;import android.widget.ArrayAdapter;import android.widget.ListView;import android.widget.SimpleAdapter;import android.widget.TextView;public class ApiDemos extends Activity { /** Called when the activity is first created. */private TextView mTextView;private ListView mListView;private String [] values; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mTextView = (TextView) findViewById(R.id.text); //下面的代码用于初始化一些数据 values = new String[30]; StringBuilder sb = new StringBuilder("z"); for (int i = 0; i < values.length; i++) { sb.append(i); values[i] = sb.toString(); } mListView = (ListView) findViewById(R.id.list); mListView.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, values)); mTextView.setText(String.valueOf(mListView.getAdapter().getCount())); //为ListView注册ContextMenu registerForContextMenu(mListView); } //创建ContextMenu @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { // TODO Auto-generated method stub if (v.getId() == R.id.list) { MenuInflater inflater = getMenuInflater(); menu.setHeaderTitle("contextView sample").setHeaderIcon(R.drawable.icon); inflater.inflate(R.menu.test_menu, menu); } super.onCreateContextMenu(menu, v, menuInfo); } @Override public boolean onContextItemSelected(MenuItem item) { // TODO Auto-generated method stub if (item.getMenuInfo() instanceof AdapterContextMenuInfo) { AdapterContextMenuInfo menuInfo = (AdapterContextMenuInfo) item.getMenuInfo(); //处理菜单的点击事件 switch (item.getItemId()) { case R.id.call: mTextView.setText(item.getTitle().toString() + menuInfo.position); break; case R.id.cc: mTextView.setText(item.getTitle().toString() + menuInfo.position); break; case R.id.poweroff : mTextView.setText(item.getTitle().toString() + menuInfo.position); break; } } return super.onContextItemSelected(item); }}