How to use

setOnLongClickListener

method

in

com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  SubsamplingScaleImageView imageView = findViewById(id.imageView);
  imageView.setImage(ImageSource.asset("sanmartino.jpg"));
  imageView.setOnClickListener(new View.OnClickListener() {
    @Override public void onClick(View v) { Toast.makeText(v.getContext(), "Clicked", Toast.LENGTH_SHORT).show(); }
  });
  imageView.setOnLongClickListener(new View.OnLongClickListener() {
    @Override public boolean onLongClick(View v) { Toast.makeText(v.getContext(), "Long clicked", Toast.LENGTH_SHORT).show(); return true; }
  });
}

private SubsamplingScaleImageView getLongImageView(ImageSource imageSource, File file, int orientation, float hScale) {
  SubsamplingScaleImageView imageView = new SubsamplingScaleImageView(this);
  if (orientation == 1) {//纵向图
    imageView.setMinimumScaleType(SubsamplingScaleImageView.SCALE_TYPE_CENTER_CROP);
    imageView.setImage(imageSource, new ImageViewState(0, new PointF(0, 0), SubsamplingScaleImageView.ORIENTATION_0));
  } else {//横向长图
    if (file != null) {
      //因为这里展示的是原图，不是经过fresco压缩的bitmap，这里拿到图片的原始宽高，从新计算最大缩放比
      hScale = screenHeight / BitmapUtil.getImageSize(file.getAbsolutePath())[1];
    }
    imageView.setMaxScale(hScale);
    imageView.setImage(imageSource);
  }
  imageView.setOnClickListener(onClickListener);
  //图片下载完成并且开启图片保存才给长按保存
  imageView.setOnLongClickListener(this);
  return imageView;
}