Android global variable

Question

How can I create global variable keep remain values around the life cycle of the application regardless which activity running..

Answer 1

You can extend the base android.app.Application class and add member variables like so:

public class MyApplication extends Application {

    private String someVariable;

    public String getSomeVariable() {
        return someVariable;
    }

    public void setSomeVariable(String someVariable) {
        this.someVariable = someVariable;
    }
}

In your android manifest you must declare the class implementing android.app.Application (add the android:name=".MyApplication" attribute to the existing application tag):

<application 
  android:name=".MyApplication" 
  android:icon="@drawable/icon" 
  android:label="@string/app_name">

Then in your activities you can get and set the variable like so:

// set
((MyApplication) this.getApplication()).setSomeVariable("foo");

// get
String s = ((MyApplication) this.getApplication()).getSomeVariable();

Answer 2

Technically this does not answer the question, but I would recommend using the Room database instead of any global variable. https://developer.android.com/topic/libraries/architecture/room.html Even if you are 'only' needing to store a global variable and it's no big deal and what not, but using the Room database is the most elegant, native and well supported way of keeping values around the life cycle of the activity. It will help to prevent many issues, especially integrity of data. I understand that database and global variable are different but please use Room for the sake of code maintenance, app stability and data integrity.