CODEWITHSUNDEEP
android-layoutandroid-widgetandroid
SirKnigget
SirKnigget

Reputation: 3644

How to know when a view is actually displayed

I have a Gallery that displays multiple scrollable frames, each containing a complex layout. One of these layout elements is a gauge-like custom view that should animate whenever it gets displayed - not just created. So if I scroll to the layout containing this view once, then go back, then scroll there again - it should do its animation and the user should see it.

I didn't find an appropriate callback for that. What I've already tried is overriding:

onDraw

onLayout

onAttachedToWindow

onDisplayHint

onVisibilityChanged

Some of them are not called at all, and some are called only when the Gallery re-initializes the view - not when it is actually displayed.

Thank ahead!

Upvotes: 1

Views: 1143

Answers (1)

Matthew
Matthew

Reputation: 44919

You could try overriding getView on your Gallery's adapter:

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View view = super.getView(position, convertView, parent);
    /* trigger your animation on this view */
    return view;
}

There isn't an explicit contract for when getView is called, but it should be called when the view in question appears on the screen.

Upvotes: 1

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