opencv - Select Image area on Image view in Android -


i want select rect area of image i.e. of bitmap in image view . rect area defined user touch. not crop. user can select rect area , sub-image created. giving code below nut not independent of devices , have incorporated opencv camculating region of interest , please me

protected void oncreate(bundle savedinstancestate) {

super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main);  final dragrectview view = (dragrectview) findviewbyid(r.id.dragrect); imview1 = (imageview) findviewbyid(r.id.imageview1); bmp = bitmapfactory.decoderesource(getresources(), r.drawable.poll); imview1.setimagebitmap(bmp); final mat mat1=new mat(bmp.getheight(),bmp.getwidth(),cvtype.cv_8uc4); utils.bitmaptomat(bmp, mat1);    if (null != view) {     view.setonupcallback(new dragrectview.onupcallback() {         @override         public void onrectfinished(final rect rect) {               org.opencv.core.rect rectmat = new org.opencv.core.rect(10,20,240,360);                mat matroi = new mat(mat1,rectmat);              bitmap bm = bitmap.createbitmap(matroi.rows(),matroi.cols(),config.argb_8888);             utils.mattobitmap(matroi, bm);              //mat1.copyto(rectmat);              toast.maketext(getapplicationcontext(), "rect (" + rect.left + ", " + rect.top + ", " + rect.right + ", " + rect.bottom + ")",                     toast.length_long).show();             imview1.setimagebitmap(bm);          }     }); }

}

this code draw rectangle using android.graphics.rect.

public int imgyoffset; public int imgxoffset; private rectangle_box = null; final atomicreference<point> rectbox_1stcorner = new atomicreference<point>();     final paint rectpaint = new paint();     rectpaint.setcolor(color.rgb(0, 255, 0));     rectpaint.setstrokewidth(5);     rectpaint.setstyle(style.stroke);      setontouchlistener(new ontouchlistener() {         @override         public boolean ontouch(view v, motionevent event) {              final point corner = new point(event.getx() - imgxoffset, event.gety() - imgyoffset);             switch(event.getaction()){             case motionevent.action_down:                 rectbox_1stcorner.set(corner);                 break;             case motionevent.action_up:                 rectangle_box= new rect(rectbox_1stcorner.get(), corner);                 break;             case motionevent.action_move:                 final android.graphics.rect rect = new android.graphics.rect(                                 (int)rectbox_1stcorner.get().x + imgxoffset, (int)rectbox_1stcorner.get().y + imgyoffset,                                  (int)corner.x + imgxoffset, (int)corner.y + imgyoffset);                 final canvas canvas =_holder.lockcanvas(rect);                 canvas.drawcolor(color.transparent, porterduff.mode.clear); // remove old rectangle                 canvas.drawrect(rect, rectpaint);                 _holder.unlockcanvasandpost(canvas);                 break;             }              return true;         }     }); }  // if rectangle box not null assign rectangle_box new mat or bitmap object create subimage want work with.

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