Android学习笔记之ContextualMenu上下文菜单用于长按事件的确定
（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
@Override
protected 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
*/
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
// TODO Auto-generated method stub
getMenuInflater().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
*/
@Override
public boolean onContextItemSelected(MenuItem item) {
// TODO Auto-generated method stub
AdapterContextMenuInfo 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; }
*/
}
