How to reset zoom?

[sashafiero]

I can't figure out how to reset the zoom level. I am using one ImageView, into which I am loading one image at a time (from a thumbnail) for zooming with. However, if I open one, zoom in a bit, close it (hiding the imageview), then open another image, it shows up at the same zoom level as the one before it.

I tried setting a new ImageMatrixTouchHandler on the zoomed in ImageView every time I load in a new pic, but that didn't help.

I also tried making a "standalone" ImageMatrixTouchHandler ahead of setting it on the ImageView, with the thought that I could try myImageMatrixTouchHandler.animateZoom(0, 0) but I get a
Attempt to invoke virtual method 'void android.graphics.Matrix.getValues(float[])' on a null object reference

[martinwithaar]

You could try setting an identity matrix to the ImageView like so:

imageView.setImageMatrix(new Matrix());
imageView.invalidate();

This would reset all transforms on the image such as scaling and translations. I am not sure if the last row is required for the view to update properly. You should try it out yourself.

[sashafiero]

Unfortunately, that gave other problems. Load a photo into the zoomable ImageView, zoom it, close it. Open another, and it's fit to the space, but you can't zoom it at all. Also, where normally a landscape photo is centered vertically, the "broken" ones are at the top of the space.

I simplified everything as much as I could in a test version, and I've ended up just making a new ImageView to hold the zoomable full screen image, and removing it entirely when the zoomed image is closed.

[ndubbaka]

I have the same issue as @sashafiero

Until we find a real solution, I followed what @sashafiero did with "making a new ImageView"

                ViewGroup.LayoutParams lParams = ivImage.getLayoutParams();
                imageParentLayout.removeView(ivImage);
                ivImage = new ImageView(this);
                ivImage.setLayoutParams(lParams);
                imageParentLayout.addView(ivImage);

[vladislav1nikov]

My solution to this problem:
imageView.setImageMatrix(new Matrix());
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);

[VivekThummar52]

@vladislav1nikov Thanks for the solution, it worked for me..