How can you tell if a View is visible on screen in

问题:

I want to check if a View within a ScrollView is currently visible in Android. I am not checking if it is focused on yet but if it is currently being displayed on screen. Is there a method in View that can tell me if the view is currently visible?

回答1:

This code works for me:

public static boolean isVisible(final View view) {
    if (view == null) {
        return false;
    }
    if (!view.isShown()) {
        return false;
    }
    final Rect actualPosition = new Rect();
    view.getGlobalVisibleRect(actualPosition);
    final Rect screen = new Rect(0, 0, getScreenWidth(), getScreenHeight());
    return actualPosition.intersect(screen);
}

回答2:

int[] location = new int[2];
view.getLocationOnScreen(location);

or

Rect rect = new Rect();
view.getGlobalVisibleRect(rect);

Now use this location or rectangle to check if it is in your visible bounds or not. If it is simply the entire screen, check against getResources().getDisplayMetrics().

As pointed by Antek in the comments below, the view may still be gone or invisible with the returned values here telling where it was last drawn. So combining the above bounds-related condition with an view.isShown() or view.getVisibility() == VISIBLE should take care of that.

回答3:

try

if(view.isShown()) {
    // Visible
} else { 
    // Invisible
}

回答4:

The getVisibility() method will help you to check the visibility of any View.

Example:

if(view.getVisibility() == View.VISIBLE) {
    // Visible
} else { 
    // Invisible
}

回答5:

The function View.getVisibility() can have below values:

• View.VISIBLE (0): the view is visible.

• View.INVISIBLE (1): The view is invisible, but it still takes up space for layout purposes.

• View.GONE (2): the view is gone. Completely hidden, as if the view had not been added

You can see below link for more info. How can I check if a view is visible or not in Android?