android - Show a pop-up dialog at the end of the game on SurfaceView -

i want pop dialog box when user completes game show points , time. read runonuithread , tried implement solution in code, not working. following error:

"can't create handler inside thread has not called looper.prepare()"

.

i have bool variable called gamecompleted in surfaceview class, when becomes true call method showdialoggamecompleted() implemented in activity class. wrong?

my activity class:

public class canvastutorial extends activity {  final context context = this; dialog dialog;  /** called when activity first created. */ @targetapi(build.version_codes.honeycomb_mr2) @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.play_layout);        }      // method call surfaceview class in order show dialog public void showdialoggamecompleted() {                dialog= new dialog(context);     dialog.setcontentview(r.layout.custom);     dialog.settitle("puzzle completed!");          // set custom dialog components - text, image , button         textview text = (textview) dialog.findviewbyid(r.id.text);         text.settext("congratulations!\npoints: \nmoves: \ntime: ");         imageview image = (imageview) dialog.findviewbyid(r.id.image);         image.setimageresource(r.drawable.cup);          button dialogbutton = (button) dialog.findviewbyid(r.id.dialogbuttonok);         // if button clicked, close custom dialog         dialogbutton.setonclicklistener(new onclicklistener() {             @override             public void onclick(view v) {                 dialog.dismiss();             }         });          canvastutorial.this.runonuithread(new runnable() {             public void run() {                 dialog.show();             }         });        } 

my surfaceview class:

public class mysurfaceview extends surfaceview implements surfaceholder.callback{ private canvasthread canvasthread; private canvastutorial canvastutorial= new canvastutorial();    public mysurfaceview(context context, attributeset attrs) {     super(context, attrs);      // todo auto-generated constructor stub      getholder().addcallback(this);     canvasthread = new canvasthread(getholder(), this);     setfocusable(true);      }   public mysurfaceview(context context) {        super(context);         getholder().addcallback(this);         canvasthread = new canvasthread(getholder(), this);         setfocusable(true);     }   @override public void ondraw(canvas canvas) {      if(canvas!=null)     {          switch (w)         {             case menu:                                   //menu stuff                 break;              case game:                  // when game completed call                  //showdialoggamecompleted method implemented in activity class                 if(gamecompleted)                 {                     gamecompleted=false;                     canvastutorial.showdialoggamecompleted();                 }                                break;         }     } }      @override public void surfacechanged(surfaceholder holder, int format, int width,         int height) {     // todo auto-generated method stub  } @override public void surfacecreated(surfaceholder holder) {            canvasthread.setrunning(true);     canvasthread.start();   } @override public void surfacedestroyed(surfaceholder holder) {     // todo auto-generated method stub     boolean retry = true;     canvasthread.setrunning(false);     while (retry) {         try {             canvasthread.join();             retry = false;         } catch (interruptedexception e) {             // try again , again...         }     }  } 

my thread class:

public class canvasthread extends thread { private surfaceholder _surfaceholder; private mysurfaceview _mysurfaceview; private boolean _run = false;  public canvasthread(surfaceholder surfaceholder, mysurfaceview mysurfaceview) {     _surfaceholder = surfaceholder;     _mysurfaceview = mysurfaceview; }  public void setrunning(boolean run) {     _run = run; }  @override public void run() {     canvas c;     while (_run)     {         c = null;         try         {             c = _surfaceholder.lockcanvas(null);             synchronized (_surfaceholder)             {                 _mysurfaceview.ondraw(c);             }         }                 {             // in if exception thrown             // during above, don't leave surface in             // inconsistent state             if (c != null)                 _surfaceholder.unlockcanvasandpost(c);         }     } } } 

you can not call thread. because still working. think need use handler. answer. maybe can you. https://stackoverflow.com/a/16886486/3077964