In Android, how to detect a component (like TextView) has been drawn?

Question

When the user launches an app, (I guess) the interface is shown by components, like Button, TextView, LinearLayout and so on.

The question is how to detect such a component has just been drawn (i.e. user can see it)?

For example, right after it is drawn, output a string "component_id is drawn".

score 3 · Accepted Answer · answered Mar 23 '14 at 15:10

3

Use a ViewTreeObserver.

view.getViewTreeObserver().addOnDrawListener(new OnDrawListener() {

        @Override
        public void onDraw() {

                   Log.i("component","is drawn");

        }

    });

answered Mar 23 '14 at 15:10

ElDuderino

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If it matters in the case, onDraw() is invoked when a view is about to be drawn, see [here](http://developer.android.com/reference/android/view/ViewTreeObserver.OnDrawListener.html#onDraw()) – Onik Mar 23 '14 at 15:32

In Android, how to detect a component (like TextView) has been drawn?

1 Answers1