Android- Thread.join()导致Application挂起

Question

我有一个处理我的游戏循环的线程,当我在这个线程上调用.join()时应用程序停止响应.我一直在努力解决程序永远不会到达代码的问题,IE线程永远不会结束.

System.out.println("YAY");

我的游戏循环线程:

这个帖子成功打印出"Game Ended"但似乎永远不会完成.

Runnable startGameLoop = new Runnable() {//game loop
          @Override
          public void run() {

              AiFactory ai = new AiFactory();
              final Button play = (Button) findViewById(R.id.Play);
              final Button pass = (Button) findViewById(R.id.Pass);

              while(finish==false){
                  try {
                        Thread.sleep(500);
                  } catch (InterruptedException e) {
                        e.printStackTrace();
                  }
                  currentPlayer = game.getPlayer();

                  if(currentPlayer.isPlayer()==false){

                      //System.out.println("passCount:" +game.getPasscount());
                      ai.decide(nextPlay, game.getPreviousPlayed(), currentPlayer, game.getPasscount() );
                      if(nextPlay.size()!=0){
                          runOnUiThread(new Runnable(){
                            public void run(){
                                changeArrow();
                                if(nextPlay.size() ==1){
                                    play1Card();
                                }
                                else if(nextPlay.size()==2){
                                    play2Card();
                                }
                                else if(nextPlay.size()==3){
                                    play3Card();
                                }
                                else if(nextPlay.size()==5){
                                    play5Card();
                                }
                            }
                      }
                      else{
                          game.addPassCount();
                          game.nextTurn();
                          runOnUiThread(new Runnable(){
                                public void run(){
                                    changeArrow();
                                }
                            });
                      }     
                   }
                   else if (currentPlayer.isPlayer()==true){
                      runOnUiThread(new Runnable(){
                            public void run(){
                                changeArrow();
                                play.setClickable(true);
                                 if(game.getPasscount()==3){
                                     pass.setClickable(false);
                                 }
                                 else{
                                     pass.setClickable(true);
                                 }
                            }
                        });
                  }

             }
             System.out.println("Game Ended");
          }
     };

启动并将线程加入主线程:

     Thread myThread = new Thread(startGameLoop);

     myThread.start();
     try {
        myThread.join();
    } catch (InterruptedException e) {
            // TODO Auto-generated catch block
        e.printStackTrace();
    }

     System.out.println("YAY");
}

据我所知.join()使当前线程等到新线程完成后再继续.

对不起,如果这是一个愚蠢的问题,我对线程很新.

Answer 1

Thread.join使当前线程等待,直到您调用它的线程结束.它不会导致您调用它的线程结束.因此,如果该线程永远不会结束(正如您在顶部所说的那样),则调用join将使其永久挂起.

如果你想真正结束线程,请在上面调用cancel.但这需要你的线程偶尔调用isCanceled()并退出其run函数,如果它返回true.

Answer 2

当你myThread.join()在里面调用时,Activity.onCreate你阻止了主UI线程.当然,看起来您的应用程序已停止响应,因为UI线程负责重绘UI.您的所有通话都runOnUiThread不会发生,因为您的UI线程忙于等待您的游戏循环.