How to convert canvas to bitmap in android? -

i creating app in android user draw on canvas , save user directory i.e. sdcard.

but problem bitmap save shows black image , mean image never saves drawn on canvas black image saves.

here code

import java.io.file; import java.io.filenotfoundexception; import java.io.fileoutputstream;  import android.content.context; import android.graphics.bitmap; import android.graphics.bitmap.compressformat; import android.graphics.bitmap.config; import android.graphics.canvas; import android.graphics.color; import android.graphics.paint; import android.graphics.path; import android.os.environment; import android.view.motionevent; import android.view.view; import android.widget.toast;  public class drawwrite extends view {     float touchxd = 0, touchyd = 0, touchxu = 0, touchyu = 0, touchxm = 0,             touchym = 0; // define touch co-ordinates     float x1 = 0, y1 = 0, x2 = 0, y2 = 0; // define drawing path co-ordinates     float stroke = 2; // define message structure width     int i=0; boolean move = false, moved = false, moveu = false; // define whether                                                     // touch has occurred or                                                     // not boolean exp = false; paint paint = new paint(); // paint object path mpath = new path(); // define drawing message path context context;  public drawwrite(context context) {     super(context);     this.context=context; }  @override public void ondraw(canvas canvas) {     super.ondraw(canvas);     invalidate();     paint.setantialias(true);     if (drawwriteactivity.clearscreen){         mpath.reset();         drawwriteactivity.clearscreen = false;     }     if(drawwriteactivity.saveimage){         try {             getdrawnmessage(canvas);             drawwriteactivity.saveimage = false;         } catch (filenotfoundexception e) {             e.printstacktrace();         }     }     paint.setcolor(color.parsecolor(drawwriteactivity.colorprovider));     paint.setstyle(paint.style.stroke);     paint.setstrokewidth(drawwriteactivity.strokeprovider);     if (moved == true) {         x1 = touchxd;         y1 = touchyd;         moved = false;      } else if (move == true) {         x2 = touchxd;         y2 = touchyd;         mpath.moveto(x1, y1);         mpath.lineto(x2, y2);         canvas.drawpath(mpath, paint);         x1 = x2;         y1 = y2;     } }  @override public boolean ontouchevent(motionevent event) {     switch (event.getaction()) {     case motionevent.action_down:         touchxd = (float) event.getx();         touchyd = (float) event.gety();         moved = true;         break;     case motionevent.action_up:         touchxu = (float) event.getx();         touchyu = (float) event.gety();         moveu = true;         break;     case motionevent.action_move:         touchxd = (float) event.getx();         touchyd = (float) event.gety();         move = true;         break;     }     return true; }  public void getdrawnmessage(canvas canvas) throws filenotfoundexception{     bitmap bitmap;     setdrawingcacheenabled(true);     toast.maketext(getcontext(), "toasting", toast.length_short).show();     string root = environment.getexternalstoragedirectory().tostring();     file imgdir = new file(root+"/chitbak/");     string imgname;     bitmap = bitmap.createbitmap(getwidth(), getheight(), config.argb_8888);     imgdir.mkdirs();     imgname = "img"+i+".jpg";     i++;     file file = new file(imgdir,imgname);     if(file.exists()) file.delete();     fileoutputstream outimg = new fileoutputstream(file);     bitmap.compress(compressformat.jpeg, 100, outimg);     setdrawingcacheenabled(false); } } 

i want clarify when use

bitmap = bitmap.createbitmap(getdrawingcache()); 

method throws stackoverflow exception.

please friends me because pissed off situation week.

your bitmap black because didn't draw on it.

to have drawing in bitmap must indeed create call :

bitmap = bitmap.createbitmap(getdrawingcache()); 

then have stackoverflow exception because :

• getdrawingcache() call ondraw(canvas)
• ondraw(canvas) call getdrawnmessage(canvas canvas)
• getdrawnmessage(canvas canvas) call getdrawingcache()
• getdrawingcache() call ondraw(canvas)
• ...

so real problem stackoverflow exception.

solution : don't call getdrawnmessage(canvas canvas) in ondraw(canvas) method.