package com.example.androidtest;import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.SubMenu;import android.widget.Toast;public class MainActivity extends Activity{    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);            }        @Override    public boolean onCreateOptionsMenu(Menu menu){        SubMenu file = menu.addSubMenu("文件");        SubMenu edit = menu.addSubMenu("编辑");        file.add(1,1,1,"新建");        file.add(1,2,1,"打开");        file.add(1,3,1,"保存");        file.setHeaderTitle("文件操作");        file.setHeaderIcon(R.drawable.img1);        edit.add(2,1,1,"复制");        edit.add(2,2,1,"粘贴");        edit.add(2,3,1,"剪切");        edit.setHeaderTitle("文件操作");        edit.setHeaderIcon(R.drawable.img1);        return true;            }        @Override    public boolean onOptionsItemSelected(MenuItem item){        if(item.getGroupId()==1){            switch(item.getItemId()){            case 1:                Toast.makeText(MainActivity.this, "点击了新建", Toast.LENGTH_SHORT).show();                break;            case 2:                Toast.makeText(MainActivity.this, "点击了打开", Toast.LENGTH_SHORT).show();                break;            case 3:                Toast.makeText(MainActivity.this, "点击了保存", Toast.LENGTH_SHORT).show();                break;            }        }else if(item.getGroupId()==2){            switch(item.getItemId()){            case 1:                Toast.makeText(MainActivity.this, "点击了复制", Toast.LENGTH_SHORT).show();                break;            case 2:                Toast.makeText(MainActivity.this, "点击了粘贴", Toast.LENGTH_SHORT).show();                break;            case 3:                Toast.makeText(MainActivity.this, "点击了剪切", Toast.LENGTH_SHORT).show();                break;            }        }        return super.onOptionsItemSelected(item);    }}