How to get ImageView size?

Question

Android

How can I get the size of an ImageView on application startup?

Answer 1

The ViewTreeObserver gives you the ability to hook into certain stages in the "life cycle" of a View, including the stage when the View's dimensions have been determined:

imageview.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
    @Override
    public void onGlobalLayout() {
        //
        // Тут вы пишите ваш код, который завязан на знание размера View
        //

        // А тут отсоединяете OnGlobalLayoutListener
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
            imageview.getViewTreeObserver().removeGlobalOnLayoutListener(this);
        } else {
            imageview.getViewTreeObserver().removeOnGlobalLayoutListener(this);
        }
    } 
});

Answer 2

The View class has getWidth and getHeight methods. Returns the width and height of your view in pixels.