Android - 将 Java 类导入 Activity

Android - Import Java Class into Activity

提问by

I have a java class called Constantsfilled with variables. And currently if I want to use that variable in an activity I have to use it like this.

我有一个名为Constants充满变量的 java 类。目前，如果我想在活动中使用该变量，我必须像这样使用它。

Constants.variable = "blah blah";

Is there a way to import my Constantsclass into my activity so that I can just use it like a normal variable like this

有没有办法将我的Constants类导入到我的活动中，以便我可以像这样使用普通变量

variable = "blah blah";

I have tried

我试过了

import com.myname.appname.Constants;

but this doesn't seem to work.

但这似乎不起作用。

Thanks for the help in advance.

我在这里先向您的帮助表示感谢。

回答by tachyonflux

try:

尝试：

import com.myname.appname.Constants;

Are you using an IDE?

你用的是IDE吗？

Also, they way you have stated is how you are suppose to use a Constants class. But you are not suppose to assign anything... because the variable are suppose to be constant, ie. static final

此外，您所说的方式是您假设如何使用 Constants 类。但是你不应该分配任何东西......因为变量应该是常量，即。静态最终

回答by Blaze Tama

Is there a way to import my constants class into my activity so that I can just use it like a normal variable like this

有没有办法将我的常量类导入到我的活动中，这样我就可以像这样像普通变量一样使用它

I dont think so, its not what importfor.

我不这么认为，这不是import为了什么。

See this SO question : Meaning of the import statement in a Java file

请参阅此问题：Java 文件中导入语句的含义

回答by Munawwar Hussain Shelia

considering Constants.variableis a static variable

考虑Constants.variable是一个静态变量

import static com.myname.appname.Constant.*;

this will import all you static variables in you current namespace only the static variable

这将导入当前命名空间中的所有静态变量，只有静态变量

import static com.myname.appname.Constant.variable;

now you can use variable like a normal variable

现在你可以像普通变量一样使用变量

回答by jafarbtech

You have to declare "variable" as static and import the class as static by following syntax

您必须通过以下语法将“变量”声明为静态并将类导入为静态

    import static com.myname.appname.Constants.*;