globalcontext.md

Global Context

As you know Context is an important thing in Android application. Your code can do few things without Context. The latest interfaces in Android SDK provide sufficient ways to help developers avoid holding an instance of Context. DevBricksX also provides you an interface to bind a global application context - GlobalContextWrapper. You can retrieve it anywhere in your application.

Bind context

To bind the context, you can call bindContext() in application creation:

open class MyApplication : Application() {

    override fun onCreate() {
        super.onCreate()

        GlobalContextWrapper.bindContext(applicationContext)
        
        ...
    }

}

GlobalContextWrapper will bind an application context rather than an activity context. Even you pass an Activity object as second parameter to bindContext(), it will call getApplicationContext() of Activity to retrieve correct application context for further operation. That means you needn't worry about the memory leak of this global context holder. Each application process only has one application context instance and will not hold any information about the view root.

Usage context

Once, you have bound the application context. You can call getContext() whenever you need a Context instance. Here is an example:

GlobalContextWrapper.context?.startActivity(launchIntent)

If you use DevbricksApplication, it automatically binds the context of your application. Otherwise, you need to bind one before using this interface.

Unbind context

Of course, you can call unbindContext() before your application is terminated.

open class MyApplication : Application() {

    override fun onTerminate() {
        ...
    
        GlobalContextWrapper.unbindContext(applicationContext)

        super.onTerminate()
    }


}