How i can use context in Singleton?

Question

I need in my Singleton -> Context. I know that I can't passing argument in constructor, because object hasn't constructor.

Then I call it from my Application class.

Here is the code:

object Singleton {

    var userAgentInfo: String = UserAgentTools.buildUserAgent(context)

    fun initializeSdk() {
        AuthenticatorApiManager.initializeSdk(userAgentInfo)
    }
}

there are a few similar questions to this one on SO, have you tried them ? — a_local_nobody, Feb 20 '20 at 10:22
like [this](https://stackoverflow.com/questions/54075649/access-application-context-in-companion-object-in-kotlin) — a_local_nobody, Feb 20 '20 at 10:23

score 1 · Accepted Answer · edited Feb 20 '20 at 10:24

1

Move the initialization of userAgentInfo to the initializeSDK method, and send the Context as an argument, make sure to send the ApplicationContext.

object Singleton {

    var userAgentInfo: String? = null

    fun initializeSdk(context: Context) {
        userAgentInfo = UserAgentTools.buildUserAgent(context)
        AuthenticatorApiManager.initializeSdk(userAgentInfo)
    }
}

edited Feb 20 '20 at 10:24

Morozov

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answered Feb 20 '20 at 10:22

Omar HossamEldin

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It can causes memory leak. see [https://stackoverflow.com/questions/56102382/is-passing-context-as-a-parameter-to-a-method-in-a-singleton-class-causes-memory] – Dipakk Sharma Feb 20 '20 at 11:05
It will cause memory leak in case the context is an activity or something similar, but the application context is already in memory in the whole life cycle of the application , and the singletone will be destroyed when the application is destroyed with the application context – Omar HossamEldin Feb 20 '20 at 11:07
Yeah. If you passing application context then will not be any problem. – Dipakk Sharma Feb 20 '20 at 11:09
Use `context.applicationContext` within this function to be safe. Then you don't have to worry about what kind of context is passed in. – Tenfour04 Feb 20 '20 at 14:02

score 0 · Answer 2 · answered Feb 20 '20 at 10:27

0

Make Application class and write below code.

companion object {
    private lateinit var sInstance: ApplicationClass
    fun getInstance(): ApplicationClass {
        return sInstance
    }
}

Use in object like below.

ApplicationClass.getInstance()

answered Feb 20 '20 at 10:27

Dipakk Sharma

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score 0 · Answer 3 · answered Feb 21 '20 at 12:02

0

You can use context in your Singleton class using Application class instance.here it is

answered Feb 21 '20 at 12:02

Komal

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How i can use context in Singleton?

3 Answers3