Define Global Variable in Android

When we talk about global variable in java its not that the technique java has for that you have to make a single instance of a class.

How its done in android?

For this you have to create a Class named is as GlobalVariable.java,then extends the class with Application so that we can create only one instance of the class.

import android.app.Application;

public class GlobalVariable extends Application {

//add this variable declaration:
public static String global_variable;
             
               //Generate getter and setter
                public static String getgobal() {
return global_variable;
}

public static void setglobal(String global_variable) {
GlobalVariable.global_variable = global_variable;
}

                private static GlobalVariable singleton;
public static GlobalVariable getSingleton() {
return singleton;
}

public static void setSingleton(GlobalVariable singleton) {
GlobalVariable.singleton = singleton;
}



public static GlobalVariable getInstance() {
return singleton;
}

@Override
public void onCreate() {
super.onCreate();
singleton = this;
}
}



Usage is

GlobalVariable.setglobal("Android");


If you do Log.d("string stored is",GlobalVariable.getglobal());
You find Out in your LogCat the Android is printed.