CODEWITHSUNDEEP
javaandroidvariablesglobal
lilgodwin
lilgodwin

Reputation: 1108

Android simple method to create and use global variables?

I'm coming up short when trying to locate a simple method to implement a global variable into my app (an array of Java classes that I plan to use in a couple of activities). I saw one method that looked as though it made sense and was easy to implement. It involved creating a new Java Class; fill it with whatever; and insert it into the manifest <application android:name="app.com.new.GlobalVariables".... But it says that the class is not assignable to application.

I've attempted some other methods, but to no avail. Similar to C++, isn't there a way to "include" a class(or global variables) into the entire Android app?

Upvotes: 0

Views: 1224

Answers (2)

sakir
sakir

Reputation: 3502

Create a class which is extended Application 

public class GlobalClass extends Application{

private String name;
public String getName() {
return name;
}

public void setName(String Name) {

   name = Name;

}}

Later register it in manifest file

<application
    android:name="com.example.globalvariable.GlobalClass"

How to use it 

 GlobalClass globalVariable = (GlobalClass) getApplicationContext();
    globalVariable.setName("Name here");
    String name  = globalVariable.getName();

Thats it.

Upvotes: 2

Silviu Draghici
Silviu Draghici

Reputation: 328

You can use the singleton design pattern to make a new class that stores all the data you wish to keep across all your activities.

http://en.wikipedia.org/wiki/Singleton_pattern

Essentially you create a class that only contains a get method. The method creates an instance of an object if there is none or just returns the object if it has been previously instantiated. you can just call the method in each activity to get the same object.

Upvotes: 1

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