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What is getSystemService()?
- Thread starter Saathwik
- Start date
D
Deleted User
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CONNECTIVITY_SERVICE is a constant value, defined within the Context class
https://developer.android.com/reference/android/content/Context.html#CONNECTIVITY_SERVICE
getSystemService() is a method on the same class, which returns a reference to a system service object
https://developer.android.com/refer...Context.html#getSystemService(java.lang.Class<T>)
The returned parameter is of type Object, so you have to cast it to the appropriate class type - in this case ConnectivityManager.
So the key thing is that the value you pass in to this method must match up with the type you are casting to.
https://developer.android.com/reference/android/content/Context.html#CONNECTIVITY_SERVICE
getSystemService() is a method on the same class, which returns a reference to a system service object
https://developer.android.com/refer...Context.html#getSystemService(java.lang.Class<T>)
The returned parameter is of type Object, so you have to cast it to the appropriate class type - in this case ConnectivityManager.
So the key thing is that the value you pass in to this method must match up with the type you are casting to.
D
Deleted User
Guest
If you're interested in how that method works, then you can view the source code for it.
CONNECTIVITY_SERVICE is simply an integer value passed in to the method, which is used to lookup the correct service object. As I say, to understand exactly how it's doing this, you need to look at the source code.
CONNECTIVITY_SERVICE is simply an integer value passed in to the method, which is used to lookup the correct service object. As I say, to understand exactly how it's doing this, you need to look at the source code.
https://developer.android.com/reference/android/content/Context.html
"CONNECTIVITY_SERVICE
Use with getSystemService(Class) to retrieve a ConnectivityManager for handling management of network connections."
getSystemService returns a ConnectivityManager-Object which is choosen by string argument as identifier. Would bet that CONNECTIVITY_SERVICE refers to an item in an enum, but not sure. Basically its an identifier.
"CONNECTIVITY_SERVICE
Use with getSystemService(Class) to retrieve a ConnectivityManager for handling management of network connections."
getSystemService returns a ConnectivityManager-Object which is choosen by string argument as identifier. Would bet that CONNECTIVITY_SERVICE refers to an item in an enum, but not sure. Basically its an identifier.
D
Deleted User
Guest
Code:
public static final String CONNECTIVITY_SERVICE = "connectivity";getSystemService() is an abstract method on class Context, but I haven't tracked down which class provides an actual implementation of it.