【Android】菜单功能的实现：上下文菜单

1.在主面板里面添加一个列表视图，如下：

<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"    tools:context=".MainActivity" >    <ListView        android:id="@+id/listView1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_alignParentTop="true" >    </ListView></RelativeLayout>

2.要实现的功能就是在List上长按，然后弹出菜单，菜单代码布局如下：

<menu xmlns:android="http://schemas.android.com/apk/res/android" >    <item        android:id="@+id/edit"        android:orderInCategory="100"        android:showAsAction="never"        android:title="Edit"/>    <item        android:id="@+id/share"        android:orderInCategory="101"        android:showAsAction="never"        android:title="Share"/>    <item        android:id="@+id/delete"        android:orderInCategory="102"        android:showAsAction="never"        android:title="Delete"/></menu>

3.为ListView注册上下文菜单：

@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);listView = (ListView) this.findViewById(R.id.listView1);ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, getData());listView.setAdapter(adapter);// 给listView注册上下文菜单registerForContextMenu(listView);}public List<String> getData() {List<String> list = new ArrayList<String>();for (int i = 1; i <= 7; i++) {list.add("jack" + i);}return list;}

4.此时可以看到列表，但还无法弹出菜单。加载菜单代码如下：

// 上下文菜单@Overridepublic void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo) {// TODO Auto-generated method stub// 加载XML中的上下文菜单super.onCreateContextMenu(menu, v, menuInfo);MenuInflater inflater = getMenuInflater();inflater.inflate(R.menu.main, menu);}

此时可以弹出菜单。

5.定义选项的动作。

// 相应上下文菜单的操作@Overridepublic boolean onContextItemSelected(MenuItem item) {// TODO Auto-generated method stubswitch (item.getItemId()) {case R.id.delete:Toast.makeText(this, "delete", Toast.LENGTH_SHORT).show();break;case R.id.share:Toast.makeText(this, "share", Toast.LENGTH_SHORT).show();break;case R.id.edit:Toast.makeText(this, "edit", Toast.LENGTH_SHORT).show();break;default:break;}return super.onContextItemSelected(item);}

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