DrawHandler.java

public class DrawHandler {

        public Shape mCurrentShape;
        public SHAPES SELECTED_SHAPE = SHAPES.FREEHAND;
        public Paint mPaint;
        public Paint undopaint[];
        public Paint mErasePaint;
        public Paint mCurrentPaint;
        public Panel mPanel;
        public Point mDownPoint;

        // static so it will note be destroyed during screen rotations etc..
        private ArrayList<Path> GRAPHICOBJECTS;
        private ArrayList<Path> undonePaths ;
       // private ArrayList<Path> undonePaths ;

        private OnDrawListener mOnDrawListener;

        public interface OnDrawListener {
              public void onDrawShape(Shape shape, Paint paint); // narišeš shape dokončno
              public void onDrawShapeTemp(Shape shape, Paint paint); // narišeš shape, in ga potem ko je narisan, izbrišeš, če shape ni freehand
              public void onDrawAll(ArrayList<Path>  paths, Paint paint);
        }



        public DrawHandler() {
                initPaint();
        }

        public void setOnDrawListener(OnDrawListener onDrawListener) {
                mOnDrawListener = onDrawListener;
        }



        public Paint getPaint() {
                return mPaint;
        }

        public Paint getErasePaint() {
                return mErasePaint;
        }

        private void initPaint() {

                GRAPHICOBJECTS = new ArrayList<Path>();
                undonePaths = new ArrayList<Path>();

                mPaint = new Paint();
                mErasePaint=new Paint();

                mPaint.setDither(true);
                mPaint.setColor(Color.rgb(100, 100, 100));
                mPaint.setStyle(Paint.Style.STROKE);
                mPaint.setStrokeJoin(Paint.Join.ROUND);
                mPaint.setStrokeCap(Paint.Cap.ROUND);
                mErasePaint.setDither(true);
                mErasePaint.setColor(Color.rgb(255, 255, 255));
                mErasePaint.setStyle(Paint.Style.STROKE);
                mErasePaint.setStrokeJoin(Paint.Join.ROUND);
                mErasePaint.setStrokeCap(Paint.Cap.ROUND);
                mErasePaint.setStrokeWidth(15);
                setBrushWidth(6);
        }

        public void setColor(int color) {
                mPaint.setColor(color);

        }

        public void setEraseColor(int barva) {
                mErasePaint.setColor(barva);
        }

        public void setBrushWidth(int bwidth) {
                mPaint.setStrokeWidth(bwidth);
              //  mErasePaint = new Paint(mPaint);
                //mErasePaint.setARGB(255, 255, 255, 255);
        }

        public void setShape(SHAPES shape) {
                SELECTED_SHAPE = shape;
        }



        public void handleTouchEvent(MotionEvent event) {

                Point point = new Point(event.getX(), event.getY());

                if(SELECTED_SHAPE == SHAPES.ERASE)
                {   mCurrentPaint = mErasePaint;

                }
                else
                        mCurrentPaint = mPaint;

                switch(event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                        mDownPoint = point;
                        break;
                case MotionEvent.ACTION_UP:
                case MotionEvent.ACTION_MOVE:
                        setCurrentShape(SELECTED_SHAPE, point);
                        if(mOnDrawListener != null) {
                                if(event.getAction() == MotionEvent.ACTION_MOVE) {
                                        mOnDrawListener.onDrawShapeTemp(mCurrentShape, mCurrentPaint);
                                } else {
                                        mOnDrawListener.onDrawShape(mCurrentShape, mCurrentPaint);
                                }

                        }

                        break;

                }
                if(event.getAction() == MotionEvent.ACTION_UP) {
                        GRAPHICOBJECTS.add(mCurrentShape.getPath());
                    //    undopaint.length;
                        mCurrentShape = null;
                }

        }

        public void back() {
            if(GRAPHICOBJECTS.size()>0)
            {
            //undonePaths.add(GRAPHICOBJECTS.size()-1,;
            undonePaths.add(GRAPHICOBJECTS.remove(GRAPHICOBJECTS.size()-1));
            // GRAPHICOBJECTS.addAll(undonePaths);
            if(mOnDrawListener != null) {
                mOnDrawListener.onDrawAll( GRAPHICOBJECTS, mCurrentPaint);
             //   mPanel.invalidate();
    //  GRAPHICOBJECTS.remove(GRAPHICOBJECTS.size()-1);

            //  mPanel.back();
            //invalidate();
            }}
            }

        public void next() {
            // TODO Auto-generated method stub
            if(undonePaths.size()>0)
            {
            GRAPHICOBJECTS.add(undonePaths.remove(undonePaths.size()-1));
            // GRAPHICOBJECTS.addAll(undonePaths);
            if(mOnDrawListener != null) {
                mOnDrawListener.onDrawAll( GRAPHICOBJECTS, mCurrentPaint);
                }}
        }


Panel.java


public void onDrawAll(ArrayList<Path> paths, Paint paint) {
    // TODO Auto-generated method stub
     prepareBitmaps();
     synchronized (mCanvas) {
         mCanvas.drawARGB(255, 255, 255, 255); // "pobriši" vse
         mCanvas.drawARGB(255, 255,255, 255); // "pobriši" vse
          for(Path path : paths)
              mCanvas.drawPath(path , paint);
      }
     // updateBitmap(tmpCanvas, tmpBitmap,paths, paint);
     synchronized (mBitmap) {
        // tmpCanvas.drawPath(paths, paint);
         drawBitmap(mBitmap);
 }

}