java - 如何实现 AsyncTask 以延迟按钮

Question

如何将以下代码与 Async Task 合并。我看到很多教程并对代码进行了更改，但无法完全做到。这段代码完全没问题，而且工作正常，但有人建议我把它设为异步任务，这样当我按下按钮时，它需要一些时间才能启动。所以请有人在其中添加异步任务代码，以使其正常工作。

代码：-

public class QuestionActivity extends Activity implements OnClickListener{

private Question currentQ;
private GamePlay currentGame;
private CountDownTimer counterTimer;

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.question);
            processScreen();
     }
            /**
     * Configure current game and get question
     */
     private void processScreen()
     {
    currentGame = ((CYKApplication)getApplication()).getCurrentGame();
    currentQ = currentGame.getNextQuestion();
    Button nextBtn1 = (Button) findViewById(R.id.answer1);
    nextBtn1.setOnClickListener(this);
    Button nextBtn2 = (Button) findViewById(R.id.answer2);
    nextBtn2.setOnClickListener(this);
    Button nextBtn3 = (Button) findViewById(R.id.answer3);
    nextBtn3.setOnClickListener(this);
    Button nextBtn4 = (Button) findViewById(R.id.answer4);
    nextBtn4.setOnClickListener(this);
    Button nextBtn5 = (Button) findViewById(R.id.answer5);
    nextBtn5.setOnClickListener(this);
    /**
     * Update the question and answer options..
     */
    setQuestions();

}


/**
 * Method to set the text for the question and answers from the current games
 * current question
 */
private void setQuestions() {
    //set the question text from current question
    String question = Utility.capitalise(currentQ.getQuestion());
    TextView qText = (TextView) findViewById(R.id.question);
    qText.setText(question);

    //set the available options
    List<String> answers = currentQ.getQuestionOptions();
    TextView option1 = (TextView) findViewById(R.id.answer1);
    option1.setText(Utility.capitalise(answers.get(0)));

    TextView option2 = (TextView) findViewById(R.id.answer2);
    option2.setText(Utility.capitalise(answers.get(1)));

    TextView option3 = (TextView) findViewById(R.id.answer3);
    option3.setText(Utility.capitalise(answers.get(2)));

    TextView option4 = (TextView) findViewById(R.id.answer4);
    option4.setText(Utility.capitalise(answers.get(3)));

    int score = currentGame.getScore();
    String scr = String.valueOf(score);
    TextView score1 = (TextView) findViewById(R.id.score);
    score1.setText(scr);

    counterTimer=new CountDownTimer(15000, 1000) {
        public void onFinish() {                
            if(currentGame.getRound()==20)
                System.exit(0);
            currentGame.decrementScore();
            processScreen();
                         }

        public void onTick(long millisUntilFinished) {
            TextView time = (TextView) findViewById(R.id.timers);
            time.setText( ""+millisUntilFinished/1000);
                            }
    };
    counterTimer.start();
}


@Override
public void onResume() {
    super.onResume();
}


@Override
public void onClick(View arg0) {
    //Log.d("Questions", "Moving to next question");
    if(arg0.getId()==R.id.answer5)
    {
    new AlertDialog.Builder(this).setMessage("Are you sure?").setCancelable(true).setPositiveButton("Yes",
     new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog,
     int id) {
            finish();
             }
         }).setNegativeButton("No", null).show();

            }

    else
    {
        if(!checkAnswer(arg0)) return;  

    /**
     * check if end of game
     */
    if (currentGame.isGameOver()){
        //Log.d("Questions", "End of game! lets add up the scores..");
        //Log.d("Questions", "Questions Correct: " + currentGame.getRight());
        //Log.d("Questions", "Questions Wrong: " + currentGame.getWrong());
        Intent i = new Intent(this, EndgameActivity.class);
        startActivity(i);
        finish();
    }
        else
        {
        Intent i = new Intent(this, QuestionActivity.class);
                    finish();
                    startActivity(i);
    }
    }
  }



@Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
    switch (keyCode)
    {
    case KeyEvent.KEYCODE_BACK :
        return true;
    }

    return super.onKeyDown(keyCode, event);
}


/**
 * Check if a checkbox has been selected, and if it
 * has then check if its correct and update gamescore
 */
private boolean checkAnswer(View v) {

    Button b=(Button) v;
    String answer = b.getText().toString();
     counterTimer.cancel();
     b.setBackgroundResource(R.drawable.ans);
     b.setEnabled(false);
                //Log.d("Questions", "Valid Checkbox selection made - check if correct");
        if (currentQ.getAnswer().equalsIgnoreCase(answer))
        {
            b.setBackgroundResource(R.drawable.ansgreen);
            //Log.d("Questions", "Correct Answer!");
            currentGame.incrementScore();
        }
        else{
            b.setBackgroundResource(R.drawable.ansred);
            //Log.d("Questions", "Incorrect Answer!");
            currentGame.decrementScore1();
        }

        return true;
    }


}

希望任何人都可以帮助我。

提前致谢

Answer 1

使用Runnable：

private static final int START_AFTER_SECONDS = 10; 
...
Runnable mRunnable;
Handler mHandler = new Handler();
mRunnable = new Runnable() {
    @Override
    public void run() {
       //DELAYED CODE HERE
    }
};
mHandler.postDelayed(mRunnable, START_AFTER_SECONDS * 1000);

Answer 2

AsyncTask 不是这项工作的正确工具。尝试这个

getHandler().postDelayed(
     new Runnable { 
           void run() 
           { 
             methodToCall();
           } 
        }, delayTimeInMilliseconds);