使用drawable找不到alert_dialog_icon

Question

I am trying to do an example of menu item

MenuItem mnu1 = menu.add(0, 0, 0, "Item 1");
    {
        mnu1.setAlphabeticShortcut('a');
        mnu1.setIcon(R.drawable.alert_dialog_icon);            
    }

But in my eclipse i am not able to find alert_dialog_icon . Can anybody please explain me why this is happening. I am able to use only ic_launcher .

Answer 1

You need to check 3 things.

First Check whether alert_dialog_icon exists in any drawable folder or not.

Secondly Check which R Class you have imported.

Third Clean your Project and build the Project. This time it should work if above both are fine.

Answer 2

您的项目中（或链接到您的项目）需要有一个名称为alert_dialog_icon的可绘制资源（PNG或XML可绘制）。

Answer 3

As explained by others you may need to add your own images to project.

BUT ...

If you don't want to add your own resource to the "res" folder (for example - you're just trying and testing stuff) you can use some of the resources that come with Android - just use the "android.R.drawable.*" ... although it is not recommended - some of those images may become unavailable (which I doubt) in the distant future - but for testing is fine.

Her is an example ...

mnu1.setIcon(android.R.drawable.ic_dialog_alert);