如何使用switch来更短地编写此代码? [英] How to write this code shorter using switch?

问题描述

exit_app = menu.getItem(7);

exit_app.setOnMenuItemClickListener(new OnMenuItemClickListener()
{
    public boolean onMenuItemClick(MenuItem clickedItem)
    {
        //Exit the App
        try{
            _run = false;
        finish();
        }catch(Exception c)
        {
            c.toString();
        }
        return true;
    }
});

text_enter = menu.getItem(1);

text_enter.setOnMenuItemClickListener(new OnMenuItemClickListener()
{
    public boolean onMenuItemClick(MenuItem clickedItem)
    {
        _run = false;

        try{
            Thread.sleep(1000);
        setContentView(R.layout.text_enter);
        buttonCancel.setOnClickListener(buttonSendOnClickListener);
        }catch(Exception x)
        {
            x.toString();
        }
        return true;
    }
});
//and so on.....

帮助.谢谢.

Help. Thanks.

推荐答案

我想我明白了你现在想做的事情.在这种情况下，我想您想要这样的东西:

I think I get what you''re trying to do now. In that case, I think you''d want something like this:

class MyClass implements OnMenuItemClickListener {

    /* whatever function you're setting up the controls in */ {
        /* ... */
        
        exit_app = menu.getItem(7);
        text_enter = menu.getItem(1);
        /* ... */
        
        exit_app.setOnMenuItemClickListener(this);
        text_enter.setOnMenuItemClickListener(this);
        /* ... */
    }

    public boolean onMenuItemClick(MenuItem clickedItem)
    {
        switch (clickedItem.getId()) {
            case R.id.exit_app:
                //Exit the App
                try{
                    _run = false;
                finish();
                }catch(Exception c)
                {
                    c.toString();
                }
                return true;
            case R.id.text_enter:
                _run = false;

                try{
                    Thread.sleep(1000);
                    setContentView(R.layout.text_enter);
                    buttonCancel.setOnClickListener(buttonSendOnClickListener);
                }catch(Exception x)
                {
                    x.toString();
                }
                return true;
            /* ... */
        }
    }
}

但是还有其他一些事情:menu.GetItem中使用的数字应设为常量，例如:

But a few more things: the numbers used in menu.GetItem should be made into constants, for example:

static final int EXIT_APP_MENU_INDEX = 7;

另外，带有开关的函数不会按原样编译，因此将需要在开关之后或默认情况下返回一个值.

Also, the function with the switch won''t compile as-is, it will need to return a value either after the switch or in a default case.

这篇关于如何使用switch来更短地编写此代码?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！