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  1. PO
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    <p>I have an answer for you!</p> <p>When any of the <code>setImage...</code> methods are called on <code>ImageView</code> in internally a layout pass is requested, for example, <code>setImageBitmap()</code> as above is defined as such</p> <pre><code>public void setImageBitmap(Bitmap bm) { setImageDrawable(new BitmapDrawable(mContext.getResources(), bm)); } </code></pre> <p>which calls</p> <pre><code>public void setImageDrawable(Drawable drawable) { if (mDrawable != drawable) { mResource = 0; mUri = null; updateDrawable(drawable); requestLayout(); //layout requested here! invalidate(); } } </code></pre> <p>which has the effect of the gallery 'snapping' to the center of the image thats currently closest to the center of the gallery.</p> <p>What I have done to prevent this is have the View thats loading into the Gallery have a explicit height and width (in <code>dip</code>s) and using an <code>ImageView</code> subclass that ignores layout requests. This works as the gallery still has a layout pass initially but does not bother doing this every time an image in the gallery changes, which I imagine would only need to happen if the gallery views had their width and height set to <code>WRAP_CONTENT</code>, which we dont. Note that as <code>invalidate()</code> is still called in <code>setImageDrawable()</code> the image will still be drawn when set.</p> <p>My very simple <code>ImageView</code> subclass below!</p> <pre><code>/** * This class is useful when loading images (say via a url or file cache) into * ImageView that are contained in dynamic views (Gallerys and ListViews for * example) The width and height should be set explicitly instead of using * wrap_content as any wrapping of content will not be triggered by the image * drawable or bitmap being set (which is normal behaviour for an ImageView) * */ public class ImageViewNoLayoutRefresh extends ImageView { public ImageViewNoLayoutRefresh(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } public ImageViewNoLayoutRefresh(Context context, AttributeSet attrs) { super(context, attrs); } public ImageViewNoLayoutRefresh(Context context) { super(context); } @Override public void requestLayout() { // do nothing - for this to work well this image view should have its dims // set explicitly } } </code></pre> <p>edit: i should mention that the onItemSelected approaches can also work, but as I needed to hook into that while flinging was taking place I came up with the above, which I think is more flexible approach</p>
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    1. POandroid gallery view "stutters" with deferred image loading adapter
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    1. COwonderful. I tried to implement my own ImageView that doesn't call the requestLayout() when set a drawable but you can simply override requestLayout and do nothing. Ty man
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    2. COGreat answer, thanks.
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      1. USLjdawson
 

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