android - Adding an on touch coordinate and pixel color display -

my current code allows take image , display inside image view. how implement ability touch anywhere on image , display color @ pixel, color fill solid object such rectangle display is. i'm hoping solution contains rgb values need them application later on.

import android.app.activity;     import android.content.intent;     import android.graphics.drawable.drawable;     import android.net.uri;     import android.os.bundle;     import android.os.environment;     import android.provider.mediastore;     import android.view.view;     import android.widget.button;     import android.widget.imageview;       import java.io.file;      public class mainactivity extends activity {          private static final int content_request = 1337;         private file output = null;         button button;         imageview imageview;           @override         public void oncreate(bundle savedinstancestate) {             super.oncreate(savedinstancestate);             setcontentview(r.layout.activity_main);             button = (button) findviewbyid(r.id.camerabutton);             imageview = (imageview) findviewbyid(r.id.image_view);             button.setonclicklistener(new view.onclicklistener() {                   public void onclick(view v) {                      intent = new intent(mediastore.action_image_capture);                     file dir = environment.getexternalstoragepublicdirectory(environment.directory_dcim);                      output = new file(dir, "comp4image.jpeg");                     i.putextra(mediastore.extra_output, uri.fromfile(output));                      startactivityforresult(i, content_request);                  }              });         }          @override         protected void onactivityresult(int requestcode, int resultcode, intent data) {             string path = environment.getexternalstoragepublicdirectory(environment.directory_dcim) + "/comp4image.jpeg";             imageview.setimagedrawable(drawable.createfrompath(path));         }       } 

i won't provide code solution easy implement.

add view.ontouchlistener imageview.

this listener respond every single touch event happening on view. (touch down, move, touch etc...)

you can retrieve coordinate of event motionevent.getx(int) (and y equivalent). (read motionevent documentation learn more pointers).

when have x , y coordinates of touch event, can pixel color of pointed pixel in bitmap bitmap.getpixel(int, int) (see here bitmap attached imageview).

voila, have selected color. print rectangular view below image view , use color utility class extract arvb components of selected color.

hope helps.