How to listen for imageview is on screen?

Question

I have a long list of icons (about 30) in my layout, so I am getting an OutOfMemory error in Android 2.3.3.

What I want to do is creating Drawable object if only necessary (icon is visible on the current scroll).

But how to now if imageview is on the screen or not? I couldn't find a listener for this.

My icons (png files) are already in drawables folder. There is no downloading process at all.

Okay so your png are inside drawable folder?.. – Swap-IOS-Android Aug 24 '13 at 22:54 — Swap-IOS-Android, Aug 24 '13 at 22:54

score 1 · Accepted Answer · answered Aug 24 '13 at 22:46

1

Try to use ImageLoader Library which provide you lots of custom option to load list with Images...enter link description here

answered Aug 24 '13 at 22:46

Swap-IOS-Android

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score 0 · Answer 2 · answered Aug 27 '13 at 21:03

This is how I solved my problem;

Bitmap image = BitmapFactory.decodeResource(getResources(), R.drawable.icon1);
Bitmap loBitmap = Bitmap.createScaledBitmap(image, iconSize , iconSize, true);
imageView.setImageBitmap(loBitmap);

iconSize was already calculated in my case.

I didn't want to use an external library for such simple task, so I give up with lazy loading and just get rid of OOM exception.

Because of my question is about listening for view entering the screen event, I will mark @Swap-IOS-Android's answer as the answer. You can check out the library source to see how it works.

How to listen for imageview is on screen?

2 Answers2