How to get Application from Context

Question

Is there a way I can get application from Context. I noticed that activity and service has getApplication() method but Context does not.

Background:

I am using/extending the GCMBaseIntentService and the

protected abstract void  onMessage (Context context, Intent intent)

gives me a context as a parameter. I would like to get the Application object so I can downcast it to MyApplication and retrieve some variables

Thanks

(YourApplicationClass)context.getApplicationContext() – Leonidos Feb 10 '15 at 19:40 — Leonidos, Feb 10 '15 at 19:40

Egor Neliuba · Accepted Answer · 2018-10-13T12:55:38.520

31

Context#getApplicationContext will return your Application instance.

edited Oct 13 '18 at 12:55

answered Feb 10 '15 at 19:40

Egor Neliuba

14,784
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8

How so? The docs say that it will return "the **context** of the single, global Application object of the current process." The return type is `Context`, not `Application`. `Context` is an ancestor class of `Application`, but how do you know that `getApplicationContext()` will return the `Application` instance? I suspect you may be right, but I'd like to see an authoritative source that agrees. – LarsH Oct 25 '17 at 15:10
11

See for example https://stackoverflow.com/questions/5018545/getapplication-vs-getapplicationcontext which says that `getApplicationContext()` will **not** always return the same object as your `Application` instance. – LarsH Oct 25 '17 at 15:23
11

Is this even a correct answer? Why is it accepted and upvoted so much? – Tanasis Dec 04 '18 at 15:37
7

I can't find a statement confirming my answer, but at least the Google devs [use this method in AndroidX](https://android.googlesource.com/platform/frameworks/support/+/refs/heads/androidx-master-dev/lifecycle/lifecycle-process/src/main/java/androidx/lifecycle/ProcessLifecycleOwner.java?source=post_page---------------------------%2F&autodive=0%2F#162) – Egor Neliuba Aug 27 '20 at 11:40

score 10 · Answer 2 · answered Feb 01 '21 at 06:51

10

val application : Application = context.applicationContext as Application

answered Feb 01 '21 at 06:51

eggham0518

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score 0 · Answer 3 · answered Jan 03 '21 at 19:52

For those looking for an answer in kotlin:

        @BindingAdapter("app:setSelectArea")
        @JvmStatic
        fun setSelectArea(view: ImageView, mContext: ContextX){
            view.setOnClickListener {
                val application = view.context.applicationContext as Application
                val viewModel:KnowledgeViewModel by lazy { KnowledgeViewModel(application) }
                val mKnowledge = Knowledge(
                    "",
                    "abcdefg test",
                    ""
                )
                viewModel.firebaseInsertKnowledge(mKnowledge)
            }
        }

How to get Application from Context

3 Answers3

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