public class MainActivity extends Activity {

    // 定义一些变量，后面直接拿来用
    private static final int START_ITEM = Menu.FIRST;
    private static final int OVER_ITEM = Menu.FIRST + 1;
    private static final int SET_ITEM1 = Menu.FIRST + 2;
    private static final int SET_ITEM2 = Menu.FIRST + 3;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // 添加菜单项（组ID，菜单项ID，排序，标题）
        menu.add(0, START_ITEM, 100, "开始");
        menu.add(0, OVER_ITEM, 200, "结束");
        // 添加子菜单
        SubMenu sub1 = menu.addSubMenu("设置");
        sub1.add(1, SET_ITEM1, 300, "设置声音");
        sub1.add(1, SET_ITEM2, 400, "设置桌面");
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        switch (item.getItemId()) {
        case START_ITEM:
            // 提示信息
            Toast.makeText(this, "开始", Toast.LENGTH_SHORT).show();
            break;
        case OVER_ITEM:
            // 提示信息
            Toast.makeText(this, "结束", Toast.LENGTH_SHORT).show();
            break;
        case SET_ITEM1:
            // 提示信息
            Toast.makeText(this, "声音设置", Toast.LENGTH_SHORT).show();
            break;
        case SET_ITEM2:
            // 提示信息
            Toast.makeText(this, "设置桌面", Toast.LENGTH_SHORT).show();
            break;
        default:
            break;
        }
        return super.onOptionsItemSelected(item);
    }

}

public class MainActivity2 extends Activity {

    private Button btn1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main2);
        // 获取BUTTON对象
        btn1 = (Button) findViewById(R.id.button1);
        //在button上注册上下文菜单
        registerForContextMenu(btn1);
    }

    // 创建上下文菜单的事件方法
    @Override
    public void onCreateContextMenu(ContextMenu menu, View v,
            ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);

        getMenuInflater().inflate(R.menu.menu_main2, menu);

    }

    // 上下文菜单项触发事件
    @Override
    public boolean onContextItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case R.id.start:
            Toast.makeText(this, "开始。。。", Toast.LENGTH_SHORT).show();
            break;
        case R.id.over:
            Toast.makeText(this, "结束。。。", Toast.LENGTH_SHORT).show();
            break;
        default:
            break;
        }
        return super.onContextItemSelected(item);
    }

}

public class MainActivity3 extends Activity  implements OnMenuItemClickListener{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main3);
    }

    public void showPopupMenu(View v){
        //创建弹出式菜单对象（最低版本11）
        PopupMenu popup = new PopupMenu(this,v);
        //获取菜单填充器
        MenuInflater inflater = popup.getMenuInflater();
        //填充菜单
        inflater.inflate(R.menu.menu_main3, popup.getMenu());
        //设置菜单项的单击事件
        popup.setOnMenuItemClickListener(this);

        popup.show();
    }

    //弹出式菜单的单击事件处理
    @Override
    public boolean onMenuItemClick(MenuItem item) {

        switch (item.getItemId()) {
        case R.id.copy:
            Toast.makeText(this, "复制。。。", Toast.LENGTH_LONG).show();
            break;
        case R.id.del:
            Toast.makeText(this, "删除。。。", Toast.LENGTH_LONG).show();
            break;

        default:
            break;
        }
        return false;
    }

}