android - startActivity in Thread -

this code :

package gal.doron.ballinthehole;  import android.content.intent; public class ballmover extends thread {         private ball[] balls;         private paddle paddle;         private gamelevels levels;         private gameview gameview;         private enum directions {top, right, bottom, left, none};         public ballmover(ball[] b, paddle p, gamelevels levels, gameview view)         {                 this.balls = b;                 this.paddle = p;                 this.levels = levels;                 this.gameview = view;         }         @override         public void run()         {                 while(true)                 {                         if(levels.isfinishlevel())                         {                                 levels.setcurrentlevel(levels.getcurrentlevel()+1);                                 for(int i=1;i<balls.length;i++)                                 {                                         balls[i].setvisible(false);                                         balls[i].restart();                                 }                                 balls[0].restart();                                 try                                 {                                         sleep(1000);                                 }                                 catch (interruptedexception e)                                 {                                         e.printstacktrace();                                 }                         }                         for(int i=0;i<balls.length;i++)                         {                                 if(this.balls[i].isvisible())                                 {                                         this.balls[i].moveball();                                         checkhitpaddle(i);                                         checkhitbrick(i);                                 }                         }                         this.gameview.postinvalidate();                         try                         {                                 sleep(1);                         }                         catch (interruptedexception e)                         {                                 e.printstacktrace();                         }                 }         }         public void checkhitpaddle(int balli)         {                 ball ball = balls[balli];                 if(ball.left()<=paddle.right() && ball.right()>=paddle.left())                 {                         if(ball.bottom()>=paddle.top())                         {                                 ball.bounceup();                         }                 }                 else if(ball.bottom()>=paddle.bottom()+10){                          intent gameoverscreen = new intent(ballmover.this, gameoverscreen.class);                         startactivity(gameoverscreen);                 }                         //ball.restart();         }         public void checkhitbrick(int balli)         {                 ball ball = balls[balli];                 string direction = gethitbricksdirection(balli).name();                 if(direction.compareto("top")==0)                         ball.bounceup();                 if(direction.compareto("bottom")==0)                         ball.bouncedown();                 if(direction.compareto("left")==0)                         ball.bounceleft();                 if(direction.compareto("right")==0)                         ball.bounceright();         }         public directions gethitbricksdirection(int balli)         {                 ball ball = balls[balli];                 bricks bricks = levels.getlevelbricks();                 brick brick;                 for(int i=0;i<bricks.rows();i++)                 {                         for(int j=0;j<bricks.cols();j++)                         {                                 brick = bricks.getbrick(i, j);                                 if(brick.gettype()!=0)                                 {                                         if(ball.left()<=brick.right() && ball.right()>=brick.left())                                         {                                                 if(ball.bottom()-brick.top()>=0 && ball.bottom()-brick.top()<=1)                                                 {                                                         brick.ballhitbrick();                                                         return directions.top;                                                 }                                                 if(ball.top()-brick.bottom()<=0 && ball.top()-brick.bottom()>=-1)                                                 {                                                         brick.ballhitbrick();                                                         return directions.bottom;                                                 }                                         }                                         if(ball.top()<=brick.bottom() && ball.bottom()>=brick.top())                                         {                                                 if(ball.right()-brick.left()>=0 && ball.right()-brick.left()<=1)                                                 {                                                         brick.ballhitbrick();                                                         return directions.left;                                                 }                                                 if(ball.left()-brick.right()<=0 && ball.left()-brick.right()>=-1)                                                 {                                                         brick.ballhitbrick();                                                         return directions.right;                                                 }                                         }                                 }                         }                 }                 return directions.none;         } } 

i wanna make function send me gameoverscreen activity.

as can see problematics lines

intent gameoverscreen = new intent(ballmover.this, gameoverscreen.class);             startactivity(gameoverscreen); 

i know ballmover class thread , need activity..

does have solution?

the first parameter of intent constructor object of context class of of it's subclasses. 1 of ways resolve issue pass context @ ballmover constructor:

public ballmover(ball[] b, paddle p, gamelevels levels, gameview view, context context)     {             this.balls = b;             this.paddle = p;             this.levels = levels;             this.gameview = view;             this.context = context;     } 

by context can pass application context, example. after can create intent following:

intent myintent = new intent(context, gameoverscreen.class);