Is it necessary to write URL of webservice in each page

Question

Is it necessary to write URL of web-service in each page in android application or any other way where i can save URL once for the whole application.

I have a android application where i am calling web-service . I am new to android so i don't have idea of saving the URL globally. How i can save the URL once in the whole application.

private final String URL = "http://192.1.1.1/Service1.asmx";

Instead of writing in every .java file what else i can do.

Answer 1

Create a class in java and declare a String field like the following in that class,

public class MyConstants {
    public static final String Url = "http://192.1.1.1/Service1.asmx";
}

then you can access it globally from any class like the following

String url = MyConstants.Url;

As Url is a static final field of MyConstants class, so you can access it just with the name of the class(without creating the object of the class with new Operator). i.e MyConstants in this case.

For Learning more about static and to see how this thing works, Please refer to this link

final means that the value cannot be changed after initialization, that's what makes it a constant. static means that instead of having space allocated for the field in each object, only one instance is created for the class.

So, static final means only one instance of the variable no matter how many objects are created and the value of that variable can never change.

Answer 2

If you don't want to create a class you can just put it on res/values/strings

<string name="URLWebService">http://192.1.1.1/Service1.asmx</string>

Then in each class you need it do this :

getResources().getString(R.string.URLWebService);

And you can do it directly or just put a

public static final String URL = getResources().getString(R.string.URLWebService);

You can use what you want all are going to work fine.

Answer 3

create a global constant class and save constants there :

public class Constants {
    public static final String Url = "http://192.1.1.1/Service1.asmx";
}

And access it anywhere in application by just calling Constants.Url

Answer 4

You can also use the string file in res/values.

You can you like following:

<string name="ws_url">http://192.1.1.1/Service1.asmx</string>

and use it so: String wsUrl = getString(R.string.ws_url)

Answer 5

Create common class YourGlobalClass:

public class YourGlobalClass{
public static final String URL = "192.1.1.1/Service1.asmx";
}

And wherever you want just call the class name. your variable name ex. YourGlobalClass.URL;