android 上下文菜单详解

本文使用xml来创建上下文菜单

<?xml version="1.0" encoding="utf-8"?><menu xmlns:android="http://schemas.android.com/apk/res/android">    <item            android:id="@+id/add"            android:title="添加"            android:orderInCategory="4"            />    <item            android:id="@+id/delete"            android:title="删除"            android:orderInCategory="1"            />    <item            android:id="@+id/query"            android:title="查询"            android:orderInCategory="2"            />    <item            android:id="@+id/update"            android:title="更新"            android:orderInCategory="3"            /></menu>

orderInCategory属性为排列顺序

MyActivity的布局：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"              android:orientation="vertical"              android:layout_width="fill_parent"              android:layout_height="fill_parent"        >    <Button            android:id="@+id/btn"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:text="弹出上下文菜单"            /></LinearLayout>

MyActivity.java

package com.example.contextMenuTest;import android.app.Activity;import android.os.Bundle;import android.view.ContextMenu;import android.view.MenuItem;import android.view.View;import android.widget.Button;import android.widget.Toast;public class MyActivity extends Activity {   private Button button;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        button = (Button) findViewById(R.id.btn);        //为按钮注册contextMenu，当你长按按钮的时候就会调用onCreateContextMenu方法        registerForContextMenu(button);    }    /**     * 注意：每次长按注册了contextMenu的控件，都会重新调用该方法     */    @Override    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {        System.out.println("com.example.contextMenuTest.MyActivity.onCreateContextMenu");        getMenuInflater().inflate(R.menu.basic_main, menu);        //设置标题栏的图标        menu.setHeaderIcon(R.drawable.ic_launcher);        //设置标题栏的文字        menu.setHeaderTitle("请选择操作");    }    @Override    public boolean onContextItemSelected(MenuItem item) {        switch (item.getItemId()) {            case R.id.add:                Toast.makeText(this, "你点击了添加！", 1).show();                break;            case R.id.delete:                Toast.makeText(this, "你点击了删除！", 1).show();                break;            case R.id.update:                Toast.makeText(this, "你点击了修改！", 1).show();                break;            case R.id.query:                Toast.makeText(this, "你点击了查询！", 1).show();                break;        }        return true;    }}

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