如何从上下文中获取应用程序

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

Answer 1

Context#getApplicationContext将返回您的Application实例。

Answer 2

val application : Application = context.applicationContext as Application

Answer 3

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)
            }
        }