Android get current context

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I don't really get the idea behind how this whole thing works really, so if I have some class A that need the context of a class B which extends Activityhow do i get that context? I'm searching for a more efficient way than giving the context as a parameter to class A constructor. For example if class A is going to have millions of instances then we would end up having millions of redundant pointer to Context while we should be able somehow to have just one somewhere and a getter function Base class for those who need to maintain global application state.

You can provide your own implementation by specifying its name in your AndroidManifest. There is normally no need to subclass Application. In most situation, static singletons can provide the same functionality in a more modular way. If your singleton needs a global context for example to register broadcast receiversthe function to retrieve it can be given a Context which internally uses Context.

Understanding Context In Android Application

The best and easy way to get the activity context is putting. From B activity you create a object of class A using this constructor and passing getApplicationContext. If you need the context of A in B, you need to pass it to B, and you can do that by passing the Activity A as parameter as others suggested. I do not see much the problem of having the many instances of A having their own pointers to B, not sure if that would even be that much of an overhead.

But if that is the problem, a possibility is to keep the pointer to A as a sort of global, avariable of the Application class, as hasanghaforian suggested.

In fact, depending on what do you need the context for, you could even use the context of the Application instead.

android get current context

I'd suggest reading this article about context to better figure it out what context you need. Learn more. How to get my activity context? Ask Question. Asked 8 years, 1 month ago. Active 2 years, 5 months ago. Viewed k times. Gan 1, 2 2 gold badges 9 9 silver badges 26 26 bronze badges.

Ofek Ron Ofek Ron 7, 11 11 gold badges 47 47 silver badges 86 86 bronze badges. But why do you need A context in Class B? Rakesh You get it wrong This is something common.

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Active Oldest Votes. You can use Application class public class in android.When your android application grows, there are a lot of util classes. And sometime you need to use android application context in those classes to do something like create Toast message or create Snackbar popup. And if you pass the context object as input parameter to every util class, you will find that it is impossible and complex. This article will tell you how to retrieve android app context object in any util class when you need.

As you can see in AndroidManifest. So the best method to resolve this issue is to define a custom application object extends android. Application and use it in your AndroidManifest. Then you can use below code to get this android app context object anywhere in your java util class and use it when you need. That means if you want to use the appContext object to initialize other class object, you can use the application context created here by below code.

Thanks so much — after searching for a simple solution for this, yours was the only one that makes sense and it actually works. I am tempted to put your solution on stackoverflow, but it will probably get flagged as a duplicate of some non-answer Rarely do I ever reply.

I have wasted so much time looking for a solution to this nonsense problem of Android, that I must thank you. Your email address will not be published. This site uses Akismet to reduce spam.

android get current context

Learn how your comment data is processed. Skip to content. Can yo explain this part please? Leave a Reply Cancel reply Your email address will not be published.I am new to android, I am creating a shared preference object to manage user sessions where i need context path, please let me know how can i get the Applciation Context in Mono. Out of curiosity, how come doesn't xamarin android need Activity or Context to get Application's Context, while native android does need.

Xamarin android works the same way as native. Only thing different is that in java you have method that returns application context and in xamarin android you have property.

android get current context

In Xamarin, this is a static. There is no corresponding static method-or-property in Android's native java - you must have an instance of an application, a context, or an activityto obtain the application context.

Google "stackoverflow get application context", and you will see multiple pages showing ad-hoc ways to create such a static. Since Xamarin somehow manages to do this perhaps by subclassing the native Application class, as seen in those stackoverflow postsand it is a common desire, I would say it is an oversight on Google's part.

Thanks Ruben. I know you posted that awhile ago, but just saved me another hour of Googling. How do you launch an alert in Xamarin. Android from within a C lambda? I was puzzling over this earlier and stumbled onto a surprising answer. Of course because this is Android you need the context Because, well, I guess because we are running in an IoC scenario but the real control never gets inverted [I don't know]--we actually want the Xamarin.

Forms context apparently, even though we are running at the moment in my Xamarin.

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Droid code [which is part of a PCL project]. Just to make others know, Forms. Context is deprecated in case we can get another XF-way of getting that or making it through the context of your calling code.

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android get current context

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December in Xamarin. Hi I am new to android, I am creating a shared preference object to manage user sessions where i need context path, please let me know how can i get the Applciation Context in Mono. Android Thanks, Subodh. December Context or more specifically, Android. Thanks Ruben, It Works. September October edited October May Thanks Ruben. Application makes me cry the same way Bb. Database does.

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May edited May Context; worked for me.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I want to use it in my array adapter. When I put this in a sub-activity to create an adapter it does not work. The only one I would not recommend is using getBaseContext. If you need something universal, have a public static variable in your main activity and assign the application context to it when your app starts.

You can use getBaseContext but this is not a local context. Besides the correct previous answers, you may want to think about refactoring your code if you've come to the point where you need to access "your" context from a sub activity.

When you create a sub activity ie: startActivityForResult you are truly waiting for a result, not for an action in the caller activity. Then, when the sub activity has finished and you have the result of its calculationsyou can access your context in a proper way. It just doesn't seem fine that the subactivity is aware of its creator, not to mention interact with it. Learn more. How to get the current context? Ask Question. Asked 9 years, 8 months ago.

Active 2 years, 7 months ago. Viewed 82k times. Mike Baxter 5, 14 14 gold badges 58 58 silver badges bronze badges. Sudheesh Sudheesh 1 1 gold badge 3 3 silver badges 7 7 bronze badges. Active Oldest Votes. RousseauAlexandre 1, 17 17 silver badges 22 22 bronze badges. Durga Durga 1, 1 1 gold badge 12 12 silver badges 17 17 bronze badges. This returns application context, not the current context, both are different. Abandoned Cart Abandoned Cart 2, 28 28 silver badges 32 32 bronze badges.

Mudassir Mudassir Mar Bar Mar Bar 4 4 silver badges 11 11 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook.

Memory Leak - Part 4, What's your Context?

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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. We get the current foreground running Activity by. This method was deprecated in API level As of Build. LOLLIPOP, this method is no longer available to third party applications: the introduction of document-centric recents means it can leak person information to the caller.

For backwards compatibility, it will still return a small subset of its data: at least the caller's own tasks, and possibly some other tasks such as home that are known to not be sensitive. You will have memory leak problem, because of the static reference to the activity.

To avoid this, you should manage activities references. Add the name of the application in the manifest file:. So, now instead of extending Activity class for your activities, just extend MyBaseActivity. Now, you can get your current activity from application or Activity context like that :. In every Activities, instead of having to "register" itself with Application with manual coding, we can make use of the following API since level 14, to help us achieve similar purpose with less manual coding.

In Application. ActivityLifecycleCallbacksyou can get which Activity is "attached" to or "detached" to this Application. Update 3 : There is an official api added for this, please use ActivityLifecycleCallbacks instead. Having access to the current Activity is very handy. The Activity class is very useful. Numerous methods require a Contextbut how to get the pointer? Here are some ways:. You might want to add some additional checks. Blog Post. Since the this question was initially asked, many Android app also has ReactNative component - hybrid app.

I could not find a solution that our team would be happy with so we rolled our own. We use ActivityLifecycleCallbacks to keep track of current activity and then expose it through a service. If you want to check Which is the Current Activity you just need to get the last activity class in the list.

It is useful after the "OnConnectivityChanged" intent action was disabled.

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Close my last Realm Instance when the application is closed; I will init it inside a BaseActivity wich is extended from all others activities and which has a private RealmHelper Instance. ActivityLifecycleCallbacks" as you can see up.

Finally I have a receiver wich is triggered when I finish to synchronize my application, then when the sync end it will call the "IEndSyncCallback" "onEndSync" method in which I look if I have a specific Activity Class inside my ActivitiesBackStack List because I need to update the data on the view if the sync updated them and I could need to do others operations after the app sync.

The answer by waqas is good. I created a workaround for a specific case demanding less code and maintenance. I found a specific work around by having a static method fetch a view from the activity I suspect to be in the foreground.

You can iterate through all activities and check if you wish or get the activity name from martin's answer. I don't like any of the other answers. The ActivityManager is not meant to be used for getting the current activity. Super classing and depending on onDestroy is also fragile and not the best design. Honestly, the best I have came up with so far is just maintaining an enum in my Application, which gets set when an activity is created.

Another recommendation might be to just shy away from using multiple activities if possible.Privacy Policy. Proudly published with Ghost. Branding and design by Cinder Design Co. In the world of Android one of my biggest pain points over the years is that often you need access to the apps current Activity when writing libraries or abstracting out common functionality.

While this works short term for MY app, it completely falls down when you want to create Plugins or abstract an API into an interface of some sort. When it comes down to it you just need that Activity, and it should be easy! After this though, you are all done. So, let me introduce to you my latest Plugin for Xamarin. You guessed it, this plugin does 1 thing, lets you get access to the current activity.

In fact the entire API is just 1 property:. Here is what that looks like:. Then if you want to access the current activity anywhere in your Android application, library, or plugin simply call: CrossCurrentActivity. Activity and you will have the current activity. Checkout my monthly newsletter that you should subscribe to! Author James Montemagno. Xamarin Xamarin.

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Xamarin Android Current Activity. Tags Xamarin Xamarin. My Podcasts Checkout my monthly newsletter that you should subscribe to!

What is equivalent to getApplicationContext() in Xamarin Android

View Comments.The Context in Android is actually the context of what we are talking about and where we are currently present. This will become more clear as we go along with this. Context is almost everywhere in Android Development and it is the most important thing in Android Development, so we must understand to use it correctly.

Wrong use of Context can easily lead to memory leaks in an android application. As there are different types of context in Android, we as an Android Developer often get confused about which context to use at which place. If you are preparing for your next Android Interview, Join our Android Professional Course to learn the latest in Android and land job at top tech companies. It is an instance that is the singleton and can be accessed in activity via getApplicationContext. This context is tied to the lifecycle of an application.

The application context can be used where you need a context whose lifecycle is separate from the current context or when you are passing a context beyond the scope of activity. Example Use: If you have to create a singleton object for your application and that object needs a context, always pass the application context.

If you pass the activity context here, it will lead to the memory leak as it will keep the reference to the activity and activity will not be garbage collected.

In case, when you have to initialize a library in an activity, always pass the application context, not the activity context. You only use getApplicationContext when you know you need a Context for something that may live longer than any other likely Context you have at your disposal.

This context is available in an activity. This context is tied to the lifecycle of an activity. The activity context should be used when you are passing the context in the scope of an activity or you need the context whose lifecycle is attached to the current context. Example Use: If you have to create an object whose lifecycle is attached to an activity, you can use the activity context. This context is the application context and can be used as the application context.

You can get it using the getContext method. Suppose we have our class MyApplication which extends the Application class. And, another class MyDB which is Singleton. And MyDB which is Singleton needs context. Which context will we be passing?


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