Black Screenshot android OpenCv -

currently using opencv want happen when user presses screen of course screen/object displayed camera highlight necessary/similar colors see:color-blob-detector. video without screenshot.

below there small camera icon triggering screenshot (imagebutton), when screenshots outcome of picture black. wanted when necessary colors being highlighted , press screenshot progmatically (which imagebutton) take picture of screen (including highlighted objects) , save image in file.

i have tried using camera control opencv taking picture, hard me merge these two.

public class camera extends activity implements ontouchlistener, cvcameraviewlistener2 { private static final string  tag              = "ocvsample::activity";  private boolean              miscolorselected = false; private mat                  mrgba; private scalar               mblobcolorrgba; private scalar               mblobcolorhsv; private colorblobdetector    mdetector; private mat                  mspectrum; private size                 spectrum_size; private scalar               contour_color;   private camerabridgeviewbase mopencvcameraview; private baseloadercallback  mloadercallback = new baseloadercallback(this) {     @override     public void onmanagerconnected(int status) {         switch (status) {             case loadercallbackinterface.success:             {                 log.i(tag, "opencv loaded successfully");                 mopencvcameraview.enableview();                 mopencvcameraview.setontouchlistener(camera.this);             } break;             default:             {                 super.onmanagerconnected(status);             } break;         }     } };  public camera() {     log.i(tag, "instantiated new " + this.getclass()); }  /** called when activity first created. */ @override public void oncreate(bundle savedinstancestate) {     log.i(tag, "called oncreate");     super.oncreate(savedinstancestate);     requestwindowfeature(window.feature_no_title);     getwindow().setflags(windowmanager.layoutparams.flag_fullscreen,             windowmanager.layoutparams.flag_fullscreen);     setcontentview(r.layout.colorblobdetector);     mopencvcameraview = (camerabridgeviewbase) findviewbyid(r.id.activity_java_surface_view);     mopencvcameraview.setvisibility(surfaceview.visible);     mopencvcameraview.setcvcameraviewlistener(this);      if (!opencvloader.initdebug()) {         log.e(this.getclass().getsimplename(), "  opencvloader.initdebug(), not working.");     } else {         log.d(this.getclass().getsimplename(), "  opencvloader.initdebug(), working.");     }   }          public void camera_b(view v)     {         string path = environment.getexternalstoragedirectory().tostring() + "/" + "hellp.jpg";          v = getwindow().getdecorview().getrootview();         v.setdrawingcacheenabled(true);         bitmap bitmap = bitmap.createbitmap(v.getdrawingcache());         v.setdrawingcacheenabled(false);          outputstream out = null;         file imagefile = new file(path);          try {             out = new fileoutputstream(imagefile);             // choose jpeg format             bitmap.compress(bitmap.compressformat.jpeg, 90, out);             out.flush();         } catch (filenotfoundexception e) {             // manage exception         } catch (ioexception e) {             // manage exception         } {              try {                 if (out != null) {                     out.close();                 }              } catch (exception exc) {             }          }     }       @override     public void onpause()     {         super.onpause();         if (mopencvcameraview != null)             mopencvcameraview.disableview();     }      @override     public void onresume()     {         super.onresume();         if (!opencvloader.initdebug()) {             log.d(tag, "internal opencv library not found. using opencv manager initialization");             opencvloader.initasync(opencvloader.opencv_version_3_0_0, this, mloadercallback);         } else {             log.d(tag, "opencv library found inside package. using it!");             mloadercallback.onmanagerconnected(loadercallbackinterface.success);         }     }      public void ondestroy() {         super.ondestroy();         if (mopencvcameraview != null)             mopencvcameraview.disableview();     }      public void oncameraviewstarted(int width, int height) {         mrgba = new mat(height, width, cvtype.cv_8uc4);         mdetector = new colorblobdetector();         mspectrum = new mat();         mblobcolorrgba = new scalar(255);         mblobcolorhsv = new scalar(255);         spectrum_size = new size(200, 64);         contour_color = new scalar(255,0,0,255);     }      public void oncameraviewstopped() {         mrgba.release();     }      public boolean ontouch(view v, motionevent event) {         int cols = mrgba.cols();         int rows = mrgba.rows();          int xoffset = (mopencvcameraview.getwidth() - cols) / 2;         int yoffset = (mopencvcameraview.getheight() - rows) / 2;          int x = (int)event.getx() - xoffset;         int y = (int)event.gety() - yoffset;          log.i(tag, "touch image coordinates: (" + x + ", " + y + ")");          if ((x < 0) || (y < 0) || (x > cols) || (y > rows)) return false;          rect touchedrect = new rect();          touchedrect.x = (x>4) ? x-4 : 0;         touchedrect.y = (y>4) ? y-4 : 0;          touchedrect.width = (x+4 < cols) ? x + 4 - touchedrect.x : cols - touchedrect.x;         touchedrect.height = (y+4 < rows) ? y + 4 - touchedrect.y : rows - touchedrect.y;          mat touchedregionrgba = mrgba.submat(touchedrect);          mat touchedregionhsv = new mat();         imgproc.cvtcolor(touchedregionrgba, touchedregionhsv, imgproc.color_rgb2hsv_full);          // calculate average color of touched region         mblobcolorhsv = core.sumelems(touchedregionhsv);         int pointcount = touchedrect.width*touchedrect.height;         (int = 0; < mblobcolorhsv.val.length; i++)             mblobcolorhsv.val[i] /= pointcount;          mblobcolorrgba = converscalarhsv2rgba(mblobcolorhsv);          log.i(tag, "touched rgba color: (" + mblobcolorrgba.val[0] + ", " + mblobcolorrgba.val[1] +                 ", " + mblobcolorrgba.val[2] + ", " + mblobcolorrgba.val[3] + ")");          mdetector.sethsvcolor(mblobcolorhsv);          imgproc.resize(mdetector.getspectrum(), mspectrum, spectrum_size);          miscolorselected = true;          touchedregionrgba.release();         touchedregionhsv.release();          return false; // don't need subsequent touch events     }      public mat oncameraframe(cvcameraviewframe inputframe) {         mrgba = inputframe.rgba();          if (miscolorselected) {             mdetector.process(mrgba);             list<matofpoint> contours = mdetector.getcontours();             log.e(tag, "contours count: " + contours.size());             imgproc.drawcontours(mrgba, contours, -1, contour_color);              mat colorlabel = mrgba.submat(4, 68, 4, 68);             colorlabel.setto(mblobcolorrgba);              mat spectrumlabel = mrgba.submat(4, 4 + mspectrum.rows(), 70, 70 + mspectrum.cols());             mspectrum.copyto(spectrumlabel);         }          return mrgba;     }      private scalar converscalarhsv2rgba(scalar hsvcolor) {         mat pointmatrgba = new mat();         mat pointmathsv = new mat(1, 1, cvtype.cv_8uc3, hsvcolor);         imgproc.cvtcolor(pointmathsv, pointmatrgba, imgproc.color_hsv2rgb_full, 4);          return new scalar(pointmatrgba.get(0, 0));     } } 

as can see camera_b screenshot happens.the xml color blob detector: colorblobxml (i cannot paste xml code here)

image of output. can see, can take screenshot of button, not expected image. (this image made using power +vol down)

put in androidmanifest.xml

<uses-permission android:name="android.permission.camera"/> 

and in this

@override public void oncreate(bundle savedinstancestate) {     log.i(tag, "called oncreate");     super.oncreate(savedinstancestate);     requestwindowfeature(window.feature_no_title);     getwindow().setflags(windowmanager.layoutparams.flag_fullscreen,             windowmanager.layoutparams.flag_fullscreen);     setcontentview(r.layout.colorblobdetector);     mopencvcameraview = (camerabridgeviewbase) findviewbyid(r.id.activity_java_surface_view);     mopencvcameraview.setvisibility(surfaceview.visible);     mopencvcameraview.setcvcameraviewlistener(this);     mopencvcameraview.setcameraindex(0); //0 = , 1 = frontal     mopencvcameraview.enableview();      if (!opencvloader.initdebug()) {         log.e(this.getclass().getsimplename(), "  opencvloader.initdebug(), not working.");     } else {         log.d(this.getclass().getsimplename(), "  opencvloader.initdebug(), working.");     }