ContextMenu菜单方法

示例：main.xml

<?xml version="1.0" encoding="utf-8"?>

strings.xml

<?xml version="1.0" encoding="utf-8"?>    OntextMenuExample    Hello World, MainActivity!    myButton01    myButton02    menuHeader01    menuHeader02    Context Menu 01    Context Menu 02

main.java

package com.example9.www;import android.app.Activity;import android.os.Bundle;import android.view.ContextMenu;import android.view.ContextMenu.ContextMenuInfo;import android.view.MenuItem;import android.view.View;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity {       private TextView button01= null;    private Button button02= null;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        button01= (TextView)findViewById(R.id.button01);        button02= (Button)findViewById(R.id.button02);        this.registerForContextMenu(button01);        this.registerForContextMenu(button02);    }    @Override    public void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo) {        // TODOAuto-generated method stub    menu.setHeaderIcon(R.drawable.tp_3);        if(v == button01){            menu.setHeaderTitle(R.string.menuHeader01);            menu.add(20, 20, 20, R.string.conTextMenu01);            menu.add(20, 21, 21, R.string.conTextMenu02);        }        else if(v == button02){            menu.setHeaderTitle(R.string.menuHeader02);            menu.add(30, 30, 30, R.string.conTextMenu01);            menu.add(31, 31, 31, R.string.conTextMenu02);        }        super.onCreateContextMenu(menu, v, menuInfo);    }    @Override    public boolean onContextItemSelected(MenuItem item){    String str = "";    switch(item.getItemId()){    case 20:    str = "20";    break;    case 21:    str = "21";    break;    case 30:    str = "30";    break;    case 31:    str = "31";    break;    }    Toast.makeText(getApplicationContext(),str, Toast.LENGTH_LONG).show();    return true;    }}

知识点：1.registerForContextMenu方法：用于为一个View对象注册上下文菜单，其输入为View对象

2.onCreateContextMenu方法：初始化上下文菜单，在需要相应上下文菜单时调用

3.onContextItemSelected方法：设置上下文中某个菜单被选中时的操作

4.onContextMenuClosed方法：用于设置当前上下文菜单被关闭时的操作，其输入为menu对象

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