[英]Is there some kind of #define in Android that I can use to simplify a statement?
Consider the java android statement: 考虑一下Java android语句:
Toast.makeText (this, "some message here", Toast.LENGTH_SHORT).show ();
I would like to write something like this: 我想写这样的东西:
myToast ("some message here");
and then, it should be converted/translated/replaced by the the full version of statement. 然后,应使用完整版本的语句对其进行转换/翻译/替换。
I would like to know if Android Studio IDE (mine is 3.4.1) has some kind of helper since there is no pre-processor as in C, and so #define is not an option. 我想知道Android Studio IDE(我的版本是3.4.1)是否具有某种帮助程序,因为没有像C中那样的预处理器,因此#define不是一个选择。
Just define a method: 只需定义一个方法:
static void myToast(Context ctx, String message) {
Toast.makeText (ctx, message, Toast.LENGTH_SHORT).show ();
}
I know the question is tagged with Java, but since you're talking Android I figure I'll give you a Kotlin solution as well. 我知道问题是用Java标记的,但是既然您使用的是Android,我想我也会为您提供Kotlin解决方案。
Define an extension method on Context
: 在Context
上定义扩展方法:
fun Context.myToast(str: String) {
Toast.makeText(this, str, Toast.LENGTH_SHORT).show()
}
Now you can use this in any Activity
(or any other Context
) without having to define it everywhere. 现在,您可以在任何Activity
(或任何其他Context
)中使用它,而不必在任何地方定义它。
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