![]() ![]() ![]() Sometimes you want more direct control over the creation of injected instances. You can overcome this by using a scope with a longer lifecycle, such as a list of available scopes, components they correspond to, and the corresponding lifecycles they follow, see Hilt Components. This also means our Milk wouldn’t “survive” a configuration change, as that would involve a call to onDestroy() on the activity. The scope also determines the lifecycle of injected instances: in this case, the single instance of Milk used by Fridge and LatteActivity is created when onCreate() is called for LatteActivity - and destroyed in its onDestroy(). can only be applied to bindings inside a module that is installed inside Activit圜omponent. If that’s the case, annotate it with scope depends on the component your module is installed in, e.g. Most of your entry points will be one of these so-called Android Entry Points: These classes are entry points into Hilt’s dependency graph and Hilt needs to know they have dependencies that need injecting. A good example of this is activities, which are normally created by the Android framework rather than Hilt. Remember when I said that in many cases, your class is created by being injected and has dependencies injected into it? In some cases you’ll have a class that’s not created via dependency injection, but still has dependencies injected into it. In most cases, you’ll want to inject via constructor parameters instead. Note that injecting dependencies as fields is only useful when your class must have a constructor without parameters, such as Activity. It’s also convenient to make them lateinit to avoid making them nullable, as their initial value prior to injection is null. With returns the last line in the lambda as the result of the expression.Īpply returns the object that was passed in as the receiver as the result of the lambda expression.If the class is an entry point, here specified using the annotation (more about that in the next section), all fields annotated with are injected.įields annotated with must be public. With and Apply both accept an object as a receiver in whatever manner they are passed. Here are the Similarities and Differences Similarities ![]()
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