android - Draw dash line on a Canvas -


how can draw dash line on canvas. tried this:

paint dashpaint = new paint(); dashpaint.setargb(255, 0, 0, 0); dashpaint.setstyle(paint.style.stroke); dashpaint.setpatheffect(new dashpatheffect(new float[]{5, 10, 15, 20}, 0)); canvas.drawline(0, canvas.getheight() / 2, canvas.getwidth(), canvas.getheight() / 2, dashpaint);

and gave me not dash line simple one.

you drawing line

 canvas.drawline(0, canvas.getheight() / 2, canvas.getwidth(), canvas.getheight() / 2, dashpaint)

this draw line

solution

       private path    mpath;        mpath = new path();        mpath.moveto(0, h / 2);        mpath.quadto(w/2, h/2, w, h/2);         h , w height , width of screen          paint mpaint = new paint();        mpaint.setargb(255, 0, 0, 0);        mpaint.setstyle(paint.style.stroke);        mpaint.setpatheffect(new dashpatheffect(new float[]{5, 10, 15, 20}, 0));

in ondraw()

       canvas.drawpath(mpath, mpaint);

snap shot

enter image description here

i have background , dashed line drew on it.

example

public class fingerpaintactivity extends activity {     myview mv;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         mv = new myview(this);         setcontentview(mv);         mpaint = new paint();         mpaint.setantialias(true);         mpaint.setdither(true);         mpaint.setcolor(0xffff0000);         mpaint.setargb(255, 0, 0, 0);         mpaint.setstyle(paint.style.stroke);         mpaint.setpatheffect(new dashpatheffect(new float[]{10, 40,}, 0));         mpaint.setstrokewidth(12);     }      private paint mpaint;      public class myview extends view {         private bitmap mbitmap;         private canvas mcanvas;         private path mpath;         private paint mbitmappaint;         context context;          public myview(context c) {             super(c);             context = c;             mpath = new path();             mbitmappaint = new paint(paint.dither_flag);         }          @override         protected void onsizechanged(int w, int h, int oldw, int oldh) {             super.onsizechanged(w, h, oldw, oldh);             mbitmap = bitmap.createbitmap(w, h, bitmap.config.argb_8888);             mcanvas = new canvas(mbitmap);             mpath.moveto(0, h / 2);             mpath.quadto(w / 2, h / 2, w, h / 2);         }          @override         protected void ondraw(canvas canvas) {             super.ondraw(canvas);             canvas.drawbitmap(mbitmap, 0, 0, mbitmappaint);             canvas.drawpath(mpath, mpaint);         }     } }

modify above according needs.


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