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i am developing an android app. I have some activities in it. And i must have an object which can be available from all activities. Any ideas how to organize it?
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A global object is an object that always exists in the global scope. In JavaScript, there's always a global object defined. In a web browser, when scripts create global variables defined with the var keyword, they're created as members of the global object.
Explanation: The object declared outside all function bodies is known as global object. All functions can access the global object. The object declared inside a function body is known as local object. The scope of local object is limited to its current block.
The Application class in Android is the base class within an Android app that contains all other components such as activities and services. The Application class, or any subclass of the Application class, is instantiated before any other class when the process for your application/package is created.
Android global variables Sometimes we need to define global variables accesible from inside our android application to hold some shared values. Simplest way to implement this is to subclass Android. app. Application class and define static variables that will hold our data.
Use the global Application object in the following way:
package com.yourpackagename;
public class App extends Application {
}
In AndroidManifest.xml:
<application android:name=".App">
To access it from an Activity:
App globalApp = (App) getApplicationContext();
The App class will be instantiated automatically when the app starts. It will be available as long as the application process is alive. It can act as a global store in which you can put your things and have access to them throughout the application lifetime.
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