Question

I would like to use a class and its class variables as a global “cache” for my globally used variables.

I need to ensure that it never gets unloaded during the app livecycle and loses its values.

How can I ensure that the class never gets unloaded?

This is how the class is declared:

public class GlobalVars {
    public static Integer gi1;
    public static WebiDBAdapter gDBAdapter;
    }

Many thanks!

Answer 1

Use the Application class

Base class for those who need to maintain global application state. You can provide your own implementation by specifying its name in your AndroidManifest.xml’s tag, which will cause that class to be instantiated for you when the process for your application/package is created.

---

public class ApplicationGlobalVars extends Application 
{     

     public Integer gi1;
     public WebiDBAdapter gDBAdapter;

     // put some setter and getters here. 
     public Integer getGi1()
     { return gi1; } 

}

To use it in your activities :

ApplicationGlobalVars appState = ((ApplicationGlobalVars)this.getApplication());
appState.getGi1();