How to call getWindow() outside an Activity in Android?

问题:

I am trying to organize my code and move repetitive functions to a single class. This line of code works fine inside a class that extends activity:

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); 

However it is not working when I try to include it into an external class.

How do I call getWindow() from another class to apply it inside an Activity?

回答1:

Pass a reference of the activity when you create the class, and when calling relevant methods and use it.

void someMethodThatUsesActivity(Activity myActivityReference) {     myActivityReference.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); } 

回答2:

You shall not keep references around as suggested in the accepted answer. This works, but may cause memory leaks.

Use this instead from your view:

((Activity) getContext()).getWindow()... 

You have a managed reference to your activity in your view, which you can retrieve using getContext(). Cast it to Activity and use any methods from the activity, such as getWindow().

回答3:

You can use following method to cast current context to activity:

/**  * Get activity instance from desired context.  */ public static Activity getActivity(Context context) {     if (context == null) return null;     if (context instanceof Activity) return (Activity) context;     if (context instanceof ContextWrapper) return getActivity(((ContextWrapper)context).getBaseContext());     return null; } 

Then you can get window from the activity.

回答4:

Use

getActivity().getWindow().requestFeature(Window.FEATURE_PROGRESS); 

It's will be easier

文章来源: How to call getWindow() outside an Activity in Android?