Android: Slow performance using a big image in ImageView

Question

I have an Activity where I have a background image in an ImageView, and nine transparent buttons on top of the image.

http://i.stack.imgur.com/GGQqd.png

Answer 1

You can use Dave Morissey's Subsampling Scale Image View as a drop in replacement of the standard image view.

XML layout:

Set image in code and disable touch:

photo = (SubsamplingScaleImageView) view.findViewById(R.id.photo);
photo.setOnTouchListener(new View.OnTouchListener() {
                            @Override
                            public boolean onTouch(View v, MotionEvent event) {
                                return true;
                            }
                        });
photo.setImage(ImageSource.uri(Uri.fromFile(new File("/somepath/file.png"))));

build.gradle:

compile 'com.davemorrissey.labs:subsampling-scale-image-view:3.6.0'