How to use

setDoubleTapZoomScale

method

in

com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView

/**
 * A density aware alternative to {@link #setDoubleTapZoomScale(float)}; this allows you to express the scale the
 * image will zoom in to when double tapped in terms of the image pixel density. Values lower than the max scale will
 * be ignored. A sensible starting point is 160 - the default used by this view.
 * @param dpi New value for double tap gesture zoom scale.
 */
public final void setDoubleTapZoomDpi(int dpi) {
  DisplayMetrics metrics = getResources().getDisplayMetrics();
  float averageDpi = (metrics.xdpi + metrics.ydpi)/2;
  setDoubleTapZoomScale(averageDpi/dpi);
}

mImageView.setDoubleTapZoomScale(result);

  view.setDoubleTapZoomDpi(240);
} else {
  view.setDoubleTapZoomScale(1F);

/**
 * A density aware alternative to {@link #setDoubleTapZoomScale(float)}; this allows you to express the scale the
 * image will zoom in to when double tapped in terms of the image pixel density. Values lower than the max scale will
 * be ignored. A sensible starting point is 160 - the default used by this view.
 * @param dpi New value for double tap gesture zoom scale.
 */
public final void setDoubleTapZoomDpi(int dpi) {
  DisplayMetrics metrics = getResources().getDisplayMetrics();
  float averageDpi = (metrics.xdpi + metrics.ydpi)/2;
  setDoubleTapZoomScale(averageDpi/dpi);
}

imageView.setMinimumDpi(80);
imageView.setDoubleTapZoomScale(1.0f);