Global declaration of variable in android

Question

I am new to android development, I am parsing a xml file through SAX parser and storing the parsed data into a string.Now i need to use that string in another class, so i need to know how to call that parser in the new class. thanks in advance

Without knowing your class hierarchy in more detail, I'm wondering what's preventing you from using basic getter method? — harism, Apr 14 '11 at 08:29

score 9 · Accepted Answer · answered Apr 14 '11 at 07:40

9

I always make a class that contains all of my globals and call it "Constants.java"

final public class Constants//final to prevent instantiation
{
    public static final String SOME_STRING = "0.04";
    public static final int SOME_NUMBER = 5;
    public static final float METERS_PER_MILE = 1609.344f;

    //private constructor to prevent instantiation/inheritance
    private Constants()
    {
    }
}

to use one of these in your code, be sure to import the class and use:

Constants.SOME_NUMBER

answered Apr 14 '11 at 07:40

Someone Somewhere

23,475
11
118
166

Why don't you use an interface instead? – ernazm Apr 14 '11 at 07:41
because "an interface is a group of related methods with empty bodies" – Someone Somewhere Apr 14 '11 at 17:51
eventhough "an interface definition may also define properties that are automatically public static final", I consider the main purpose of an interface to represent a contract of related methods with empty bodies. – Someone Somewhere Apr 14 '11 at 18:01

score 2 · Answer 2 · answered Apr 14 '11 at 07:34

2

You can use a static variable and can access it any where in the application

public static int myVar = 1;

access it by ClassName.myVar

answered Apr 14 '11 at 07:34

Hasandroid

336
5
12

score 2 · Answer 3 · answered Apr 14 '11 at 07:35

2

You can use intent to pass the value. Also,you can use the manifest.xml to make a gloable variable.

answered Apr 14 '11 at 07:35

zhen01.wang

98
1
8

score 1 · Answer 4 · edited May 23 '17 at 11:49

Using the android application extension is NOT multi-process safe, as described here: How to declare global variables in Android? Note the first response. He defines how to extend the application itself but makes a note that "this method offers no way easy way of persisting the global state. If your application finds this necessary you should be using some sort of store; see the Android docs for a variety of methods." I have also seen other posts that state that between processes this method needs to be modified slightly, but I think it's possible. Let me know if I understood that wrong...

score 0 · Answer 5 · answered Apr 14 '11 at 07:38

0

You should use application object to get a global variable, you can see a working example here http://www.helloandroid.com/category/topics-covered/application-object

Application class documentation is stated here http://developer.android.com/reference/android/app/Application.html

answered Apr 14 '11 at 07:38

Yekmer Simsek

4,102
3
21
19

I am not sure, but you can always use synchronized keyword. – Yekmer Simsek Apr 14 '11 at 07:47

Global declaration of variable in android

5 Answers5

Linked