android - Notification when a specific color from a pixel is selected -

i want create program this:

• take picture;
• select area color;
• the app inform user current shade of white , select shade based on options receive app

what i'm trying message see if selected color (from touched position) closer shade of white i'm implementing (let's say, if touched color between #fcffffff , #fcfef9d5 program display "a2").

this code far:

public class mainactivity extends activity {   textview touchedxy, invertedxy, imgsize, colorrgb; imageview imgsource1; button b, bopenfromgallery; static final int camrequest = 1;  @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      touchedxy = (textview) findviewbyid(r.id.xy);     invertedxy = (textview) findviewbyid(r.id.invertedxy);     imgsize = (textview) findviewbyid(r.id.size);     colorrgb = (textview) findviewbyid(r.id.colorrgb);     b = (button)findviewbyid(r.id.button01);     bopenfromgallery = (button)findviewbyid(r.id.button_openfromgallery);     imgsource1 = (imageview)findviewbyid(r.id.source1);          b.setonclicklistener(new view.onclicklistener() {         @override         public void onclick(view v) {             intent cameraintent = new intent(android.provider.mediastore.action_image_capture);             startactivityforresult(cameraintent, camrequest);          }      });  }   protected void onactivityresult(int requestcode, int resultcode, intent data) {     if (resultcode == result_ok) {         if (requestcode == camrequest) {              bitmap bitmap = (bitmap) data.getextras().get("data");             bitmap newbitmap = bitmap_resizer(bitmap, 1280, 768);               imgsource1.setimagebitmap(newbitmap);             imgsource1.setontouchlistener(imgsourceontouchlistener);         }     } }  ontouchlistener imgsourceontouchlistener         = new ontouchlistener() {      @override     public boolean ontouch(view view, motionevent event) {          float eventx = event.getx();         float eventy = event.gety();         float[] eventxy = new float[]{eventx, eventy};          matrix invertmatrix = new matrix();         ((imageview) view).getimagematrix().invert(invertmatrix);          invertmatrix.mappoints(eventxy);         int x = integer.valueof((int) eventxy[0]);         int y = integer.valueof((int) eventxy[1]);          touchedxy.settext(                 "touched position: "                         + string.valueof(eventx) + " / "                         + string.valueof(eventy));         invertedxy.settext(                 "touched position: "                         + string.valueof(x) + " / "                         + string.valueof(y));          drawable imgdrawable = ((imageview) view).getdrawable();         bitmap bitmap = ((bitmapdrawable) imgdrawable).getbitmap();          imgsize.settext(                 "drawable size: "                         + string.valueof(bitmap.getwidth()) + " / "                         + string.valueof(bitmap.getheight()));          //limit x, y range within bitmap         if (x < 0) {             x = 0;         } else if (x > (bitmap.getwidth() - 1)) {             x = bitmap.getwidth() - 1;         }          if (y < 0) {             y = 0;         } else if (y > (bitmap.getheight() - 1)) {             y = bitmap.getheight() - 1;         }          int touchedrgb = bitmap.getpixel(x, y);          colorrgb.settext("touched color: " + "#" + integer.tohexstring(touchedrgb));         colorrgb.settextcolor(touchedrgb);          return true;     } };  public bitmap bitmap_resizer(bitmap bitmap,int newwidth,int newheight) {     bitmap scaledbitmap = bitmap.createscaledbitmap(bitmap, newwidth, newheight, true);      float ratiox = newwidth / (float) bitmap.getwidth();     float ratioy = newheight / (float) bitmap.getheight();     float middlex = newwidth / 2.0f;     float middley = newheight / 2.0f;      matrix scalematrix = new matrix();     scalematrix.setscale(ratiox, ratioy, middlex, middley);      canvas canvas = new canvas(scaledbitmap);     canvas.setmatrix(scalematrix);     canvas.drawbitmap(bitmap, middlex - bitmap.getwidth() / 2, middley - bitmap.getheight() / 2, new paint(paint.filter_bitmap_flag));      return scaledbitmap;  } 

}

as here said, can image top-left corner, calculate touched position. after that, u can color of area doing this:

bitmap bitmap = ((bitmapdrawable)imageview.getdrawable()).getbitmap(); int pixel = bitmap.getpixel(x,y); 

you can filter color this:

int red = color.red(pixel); int blue = color.blue(pixel); int green = color.green(pixel);