[英]How to avoid calling implements at 2 activites?
I have two activities: MainActivity extends ListActivity
and Preferences implements BillingController.IConfiguration
.我有两个活动: MainActivity extends ListActivity
和Preferences implements BillingController.IConfiguration
。
Now I need to call BillingController.someMethod(this)
at MainActivity
.现在我需要在MainActivity
调用BillingController.someMethod(this)
。 Such call can be made only if MainActivity implements BillingController.IConfiguration
.只有在MainActivity implements BillingController.IConfiguration
时才能进行此类调用。 But this is already implemented at Preferences
class.但这已经在Preferences
class 中实现。 What can I do to avoid implementing that again?我该怎么做才能避免再次实施?
Make a class that implements BillingController.IConfiguration
and use it inside both MainActivity
and Preferences
to delegate method calls to it.制作一个实现BillingController.IConfiguration
的 class 并在MainActivity
和Preferences
中使用它来将方法调用委托给它。
Do an instance of check.做一个检查实例。
if (instance instanceof BillingController.IConfiguration) {
((BillingController.IConfiguration)instance).someMethod(this);
}
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