Hello I am noob in android. I see that in android you can get context using different method. I could not understand the difference between them and when to use what .
Methods : getApplicationContext(), getContext(), getBaseContext(), this (Activity)
An 'Application context' is associated with the Application and will always be the same throughout the life cycle of your app (getApplicationContext())
The 'Activity context' is associated with the activity and could possibly be destroyed many times as the activity is destroyed during screen orientation changes and such.(getContext())
Generally don't use getBaseContext(), rather use one of the previous ones as needed.
You might want to use the Application Context (Activity.getApplicationContext()) rather than using the Activity context (this). This is because 'this' needs to be called from within an Activity. (Activity extends Context )
Related
What is the difference between getApplicationContext() and getActivity() and this in Android?
There is a lot of difference between :
View.getContext():
Returns the context the view is currently running in. Usually the currently active Activity.
Activity.getApplicationContext():
Returns the context for the entire application (the process all the Activities are running inside of). Use this instead of the current Activity context if you need a context tied to the lifecycle of the entire application, not just the current Activity.
ContextWrapper.getBaseContext():
If you need access to a Context from within another context, you use a ContextWrapper. The Context referred to from inside that ContextWrapper is accessed via getBaseContext().
Also check :
https://stackoverflow.com/a/10641257/4018207
https://developer.android.com/reference/android/view/View.html#getContext%28%29
There is huge difference. An android application can have more than one activity, when you say getApplicationContext(), it gives you the context of entire application: see details :
However when you say getActivity() it just gives you the instance of activity which you are currently in.
I started reading about Context And I am a bit confused.
I found the following definition.
The Context class is an “Interface to global information about an application environment.”
here I am not understanding what android application environment is?
we can use 1. getAssets() 2. getResources() 3. getPackageManager() 4. getString() 5. getSharedPrefsFile() methods ,we can also start an activity ,broadcast an Intent using Context.
I think,The above methods(bolded) provide app's global data to the app,
Are these Resources known as App global data?
So for starting activity ,what global information is used by Android
System?
How does a View use Context (what information it gets from Context)?
I am so much confused about the concept of Context class and how all these things are related.
Please provide any help.
Please go through Context details. I think these things can help you understand the idea of context.
View.getContext():
Returns the context the view is currently running in. Usually the currently active Activity.
Activity.getApplicationContext():
Returns the context for the entire application (the process all the Activities are running inside of). Use this instead of the current Activity context if you need a context tied to the lifecycle of the entire application, not just the current Activity.
ContextWrapper.getBaseContext():
If you need access to a Context from within another context, you use a ContextWrapper. The Context referred to from inside that ContextWrapper is accessed via getBaseContext().
There has been a lot of posting about what these two contexts are.. But I'm still not getting it quite right
As I understand it so far:
Each is an instance of its class which means that some programmers recommend you to use this.getApplicationContext() as often as possible in order to not "leak" out any memory. This is because the other this (getting the Activity instance context) points to an Activity that is being destroyed each time the user tilts the phone or leave the app etc.. Which apparently the Garbage Collector (GC) doesn't catch and therefore uses too much memory..
But can anyone please come up with some really good coding examples where it would be the right thing to use this (getting the context of the current Activity instance) and the application context will be useless/wrong?
getApplicationContext() is almost always wrong. Ms. Hackborn (among others) have been very explicit that you only use getApplicationContext() when you know why you are using getApplicationContext() and only when you need to use getApplicationContext().
To be blunt, "some programmers" use getApplicationContext() (or getBaseContext(), to a lesser extent) because their Java experience is limited. They implement an inner class (e.g., an OnClickListener for a Button in an Activity) and need a Context. Rather than using MyActivity.this to get at the outer class' this, they use getApplicationContext() or getBaseContext() to get a Context object.
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. Scenarios include:
Use getApplicationContext() if you need something tied to a Context that itself will have global scope. I use getApplicationContext(), for example, in WakefulIntentService, for the static WakeLock to be used for the service. Since that WakeLock is static, and I need a Context to get at PowerManager to create it, it is safest to use getApplicationContext().
Use getApplicationContext() when you bind to a Service from an Activity, if you wish to pass the ServiceConnection (i.e., the handle to the binding) between Activity instances via onRetainNonConfigurationInstance(). Android internally tracks bindings via these ServiceConnections and holds references to the Contexts that create the bindings. If you bind from the Activity, then the new Activity instance will have a reference to the ServiceConnection which has an implicit reference to the old Activity, and the old Activity cannot be garbage collected.
Some developers use custom subclasses of Application for their own global data, which they retrieve via getApplicationContext(). That's certainly possible. I prefer static data members, if for no other reason than you can only have one custom Application object. I built one app using a custom Application object and found it to be painful. Ms. Hackborn also agrees with this position.
Here are reasons why not to use getApplicationContext() wherever you go:
It's not a complete Context, supporting everything that Activity does. Various things you will try to do with this Context will fail, mostly related to the GUI.
It can create memory leaks, if the Context from getApplicationContext() holds onto something created by your calls on it that you don't clean up. With an Activity, if it holds onto something, once the Activity gets garbage collected, everything else flushes out too. The Application object remains for the lifetime of your process.
I think there's a lot of stuff that is poorly documented on the SDK site, this is one of them. The claim I'm going to make is that it seems as though it's better to default to using an application context and only use an activity context when you really need to. The only place where I've ever seen that you need an activity context is for a progress dialog. SBERG412 claims that you have to use an activity context for a toast message, yet the Android docs clearly show an application context being used. I've always used application context for toasts because of this Google example. If it's wrong to do so, then Google dropped the ball here.
Here's more to think about and review:
For a toast message, the Google Dev Guide uses the application context and explicitly say's to use it:
Toast Notifications
In the dialogs section of the Dev guide, you see that an AlertDialog.Builder uses the application context, and then the progress bar uses an activity context. This isn't explained by Google.
Dialogs
It seems like a good reason to use application context is when you want to handle configuration changes like an orientation change, and you want to retain objects which need a context like Views. If you look here: Run Time Changes
There is a caution about using an activity context, which can create a leak. This can be avoided with an application context with the views that are to be retained (at least that's my understanding). In an app I'm writing, I intend to use an application context because I'm trying to hold over some views and other things on an orientation change, and I still want the activity to be destroy and recreated on orientation changes. Thus I have to use an app context to not cause a memory leak (see Avoiding memory Leaks). To me it seems there are plenty of good reasons to use the application context instead of an activity context, and to me it almost seems like you would use it more often than an activity context. That's what many Android books I've gone through seem to do, and that's what much of the Google examples I've seen do.
The Google documentation really makes it seem like using application context is perfectly fine in most cases, and in fact appears more often than using an activity context in their examples (at least the examples I've seen). If it's really such a problem to use application context, then Google really needs to place more emphasis on this. They need to make it clear, and they need to redo some of their examples. I wouldn't blame this entirely on inexperienced developers since the authority (Google) really makes it look like it's not a problem to use application contexts.
I used this table as a guidance for when to use the different types of Context such as Application context (i.e: getApplicationContext()) and activity context , also BroadcastReceiver context:
All merits go to original author here for more info.
Which context to use?
There are two types of Context:
Application context is associated with the application and will always be same throughout the life of application -- it does not change. So if you are using Toast, you can use application context or even activity context (both) because toast can be displayed from anywhere with in your application and is not attached to a specific window. But there are many exceptions, one exception is when you need to use or pass the activity context.
Activity context is associated with to the activity and can be destroyed if the activity is destroyed -- there may be multiple activities (more than likely) with a single application. And sometimes you absolutely need the activity context handle. For example, should you launch a new activity, you need to use activity context in its Intent so that the new launching activity is connected to the current activity in terms of activity stack. However, you may use application's context too to launch a new activity but then you need to set flag Intent.FLAG_ACTIVITY_NEW_TASK in intent to treat it as a new task.
Let's consider some cases:
MainActivity.this refers to the MainActivity context which extends Activity class but the base class (activity) also extends Context class, so it can be used to offer activity context.
getBaseContext() offers activity context.
getApplication() offers application context.
getApplicationContext() also offers application context.
For more information please check this link.
I was wondering why not to use Application Context for every operation which it supports. In the end it lowers chance of memory leak and missing null check for getContext() or getActivity() (when using injected application context or acquired through static method from Application). Statements, like the one by Ms. Hackborn to use Application Context only if needed, don't seem convincing for me without an explanation why. But it seems that I have found an unswear why:
have found that there are issues on some Android version / device combinations that do not follow these rules. For instance, if I have a BroadcastReceiver that is passed a Context and I convert that Context to an Application Context and then try to call registerReceiver() on the Application Context there are many instances where this works fine, but also many instances where I get a crash because of a ReceiverCallNotAllowedException. These crashes occur on a wide range of Android versions from API 15 up to 22.
https://possiblemobile.com/2013/06/context/#comment-2443283153
Because it's not guaranteed that all operations described as supported by Application Context in the table below will work on all Android devices!
Two great examples of when you should use Activity context vs. the Application context are when displaying either a Toast message or a built-in Dialog message as using the Application context will cause an exception:
ProgressDialog.show(this, ....);
or
Toast t = Toast.makeText(this,....);
Both of these need information from the Activity context that is not provided in the Application context.
Application context live untill your application is alive only and it is not depend on Activity Life Cycle but, context keep object long-lived. If the object which you are used temporary, that time use Application Context and Activity Context is used totally oposite of Application Context.
When I'm using list view and I have a custom Base Adapter class, I get different text color in list view when base adapter is instantiated by getApplicationContext and classname.this.
By getApplicationContext I get white text color but classname.this is black. Can anyone explain it for me?
Basically they are both instances of Context, but the difference is application instance is tied to the lifecycle of the application, while the Activity instance is tied to the lifecycle of an Activity. Thus, they have access to different information about the application environment...
see getApplicationContext
EDIT
In finding your answer it will help you Android Holo Light styling changes depending on chosen context
ActivityName.this refers to activity context. getApplicationContext () refers to the application context.
Most of the times it is better to use activity context.
Check the answer provided by commonsware. Has a detail explanation on the topic.
When to call activity context OR application context?
Quote form the above link
Here are reasons why not to use getApplicationContext() wherever you go:
It's not a complete Context, supporting everything that Activity does. Various things you will try to do with this Context will fail, mostly related to the GUI.
It can create memory leaks, if the Context from getApplicationContext() holds onto something created by your calls on it that you don't clean up. With an Activity, if it holds onto something, once the Activity gets garbage collected, everything else flushes out too. The Application object remains for the lifetime of your process.
There has been a lot of posting about what these two contexts are.. But I'm still not getting it quite right
As I understand it so far:
Each is an instance of its class which means that some programmers recommend you to use this.getApplicationContext() as often as possible in order to not "leak" out any memory. This is because the other this (getting the Activity instance context) points to an Activity that is being destroyed each time the user tilts the phone or leave the app etc.. Which apparently the Garbage Collector (GC) doesn't catch and therefore uses too much memory..
But can anyone please come up with some really good coding examples where it would be the right thing to use this (getting the context of the current Activity instance) and the application context will be useless/wrong?
getApplicationContext() is almost always wrong. Ms. Hackborn (among others) have been very explicit that you only use getApplicationContext() when you know why you are using getApplicationContext() and only when you need to use getApplicationContext().
To be blunt, "some programmers" use getApplicationContext() (or getBaseContext(), to a lesser extent) because their Java experience is limited. They implement an inner class (e.g., an OnClickListener for a Button in an Activity) and need a Context. Rather than using MyActivity.this to get at the outer class' this, they use getApplicationContext() or getBaseContext() to get a Context object.
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. Scenarios include:
Use getApplicationContext() if you need something tied to a Context that itself will have global scope. I use getApplicationContext(), for example, in WakefulIntentService, for the static WakeLock to be used for the service. Since that WakeLock is static, and I need a Context to get at PowerManager to create it, it is safest to use getApplicationContext().
Use getApplicationContext() when you bind to a Service from an Activity, if you wish to pass the ServiceConnection (i.e., the handle to the binding) between Activity instances via onRetainNonConfigurationInstance(). Android internally tracks bindings via these ServiceConnections and holds references to the Contexts that create the bindings. If you bind from the Activity, then the new Activity instance will have a reference to the ServiceConnection which has an implicit reference to the old Activity, and the old Activity cannot be garbage collected.
Some developers use custom subclasses of Application for their own global data, which they retrieve via getApplicationContext(). That's certainly possible. I prefer static data members, if for no other reason than you can only have one custom Application object. I built one app using a custom Application object and found it to be painful. Ms. Hackborn also agrees with this position.
Here are reasons why not to use getApplicationContext() wherever you go:
It's not a complete Context, supporting everything that Activity does. Various things you will try to do with this Context will fail, mostly related to the GUI.
It can create memory leaks, if the Context from getApplicationContext() holds onto something created by your calls on it that you don't clean up. With an Activity, if it holds onto something, once the Activity gets garbage collected, everything else flushes out too. The Application object remains for the lifetime of your process.
I think there's a lot of stuff that is poorly documented on the SDK site, this is one of them. The claim I'm going to make is that it seems as though it's better to default to using an application context and only use an activity context when you really need to. The only place where I've ever seen that you need an activity context is for a progress dialog. SBERG412 claims that you have to use an activity context for a toast message, yet the Android docs clearly show an application context being used. I've always used application context for toasts because of this Google example. If it's wrong to do so, then Google dropped the ball here.
Here's more to think about and review:
For a toast message, the Google Dev Guide uses the application context and explicitly say's to use it:
Toast Notifications
In the dialogs section of the Dev guide, you see that an AlertDialog.Builder uses the application context, and then the progress bar uses an activity context. This isn't explained by Google.
Dialogs
It seems like a good reason to use application context is when you want to handle configuration changes like an orientation change, and you want to retain objects which need a context like Views. If you look here: Run Time Changes
There is a caution about using an activity context, which can create a leak. This can be avoided with an application context with the views that are to be retained (at least that's my understanding). In an app I'm writing, I intend to use an application context because I'm trying to hold over some views and other things on an orientation change, and I still want the activity to be destroy and recreated on orientation changes. Thus I have to use an app context to not cause a memory leak (see Avoiding memory Leaks). To me it seems there are plenty of good reasons to use the application context instead of an activity context, and to me it almost seems like you would use it more often than an activity context. That's what many Android books I've gone through seem to do, and that's what much of the Google examples I've seen do.
The Google documentation really makes it seem like using application context is perfectly fine in most cases, and in fact appears more often than using an activity context in their examples (at least the examples I've seen). If it's really such a problem to use application context, then Google really needs to place more emphasis on this. They need to make it clear, and they need to redo some of their examples. I wouldn't blame this entirely on inexperienced developers since the authority (Google) really makes it look like it's not a problem to use application contexts.
I used this table as a guidance for when to use the different types of Context such as Application context (i.e: getApplicationContext()) and activity context , also BroadcastReceiver context:
All merits go to original author here for more info.
Which context to use?
There are two types of Context:
Application context is associated with the application and will always be same throughout the life of application -- it does not change. So if you are using Toast, you can use application context or even activity context (both) because toast can be displayed from anywhere with in your application and is not attached to a specific window. But there are many exceptions, one exception is when you need to use or pass the activity context.
Activity context is associated with to the activity and can be destroyed if the activity is destroyed -- there may be multiple activities (more than likely) with a single application. And sometimes you absolutely need the activity context handle. For example, should you launch a new activity, you need to use activity context in its Intent so that the new launching activity is connected to the current activity in terms of activity stack. However, you may use application's context too to launch a new activity but then you need to set flag Intent.FLAG_ACTIVITY_NEW_TASK in intent to treat it as a new task.
Let's consider some cases:
MainActivity.this refers to the MainActivity context which extends Activity class but the base class (activity) also extends Context class, so it can be used to offer activity context.
getBaseContext() offers activity context.
getApplication() offers application context.
getApplicationContext() also offers application context.
For more information please check this link.
I was wondering why not to use Application Context for every operation which it supports. In the end it lowers chance of memory leak and missing null check for getContext() or getActivity() (when using injected application context or acquired through static method from Application). Statements, like the one by Ms. Hackborn to use Application Context only if needed, don't seem convincing for me without an explanation why. But it seems that I have found an unswear why:
have found that there are issues on some Android version / device combinations that do not follow these rules. For instance, if I have a BroadcastReceiver that is passed a Context and I convert that Context to an Application Context and then try to call registerReceiver() on the Application Context there are many instances where this works fine, but also many instances where I get a crash because of a ReceiverCallNotAllowedException. These crashes occur on a wide range of Android versions from API 15 up to 22.
https://possiblemobile.com/2013/06/context/#comment-2443283153
Because it's not guaranteed that all operations described as supported by Application Context in the table below will work on all Android devices!
Two great examples of when you should use Activity context vs. the Application context are when displaying either a Toast message or a built-in Dialog message as using the Application context will cause an exception:
ProgressDialog.show(this, ....);
or
Toast t = Toast.makeText(this,....);
Both of these need information from the Activity context that is not provided in the Application context.
Application context live untill your application is alive only and it is not depend on Activity Life Cycle but, context keep object long-lived. If the object which you are used temporary, that time use Application Context and Activity Context is used totally oposite of Application Context.