如何实现暂停和恢复countdowntimer？

Question

我已经在我的application.it的工作fine.Now实施了一个退出按钮在我的应用程序与对话框权限（是或否）。当用户按是然后退出并没有回到game.Now我的问题是如何暂停Countdowntimer，当我点击退出按钮并恢复对话框中的无按钮时。

这里是我的代码： -

public class QuestionActivity extends Activity implements OnClickListener{ 
    private Question currentQ; 
    private GamePlay currentGame; 
    public CountDownTimer counterTimer; 
    private Button nextBtn1, nextBtn2, nextBtn3, nextBtn4, nextBtn5; 


      @Override 
      public void onCreate(Bundle savedInstanceState) { 
       super.onCreate(savedInstanceState); 
       setContentView(R.layout.question); 
       processScreen(); 
     } 
       /** 
     * Configure current game and get question 
     */ 
     private void processScreen() 
     { 
     currentGame = ((Application)getApplication()).getCurrentGame(); 
     currentQ = currentGame.getNextQuestion(); 
     nextBtn1 = (Button) findViewById(R.id.answer1); 
     nextBtn1.setEnabled(true); 
     nextBtn1.setOnClickListener(this); 
     nextBtn2 = (Button) findViewById(R.id.answer2); 
     nextBtn2.setEnabled(true); 
     nextBtn2.setOnClickListener(this); 
     nextBtn3 = (Button) findViewById(R.id.answer3); 
     nextBtn3.setEnabled(true); 
     nextBtn3.setOnClickListener(this); 
     nextBtn4 = (Button) findViewById(R.id.answer4); 
     nextBtn4.setEnabled(true); 
     nextBtn4.setOnClickListener(this); 
     nextBtn5 = (Button) findViewById(R.id.answer5); 
     nextBtn5.setEnabled(true); 
     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) 
       { 
       nextBtn1.setEnabled(false); 
       nextBtn2.setEnabled(false); 
       nextBtn3.setEnabled(false); 
       nextBtn4.setEnabled(false); 
       nextBtn5.setEnabled(false); 
       final Handler handle = new Handler(); 
       Toast.makeText(QuestionActivity.this, "Time's Up", Toast.LENGTH_SHORT).show(); 
       Runnable delay = new Runnable() { 
        public void run() { 
         System.exit(0); 
        } 
       }; 
       handle.postDelayed(delay,3000); 
       } 

       else if(currentGame.getRound()==0) 
       { 
       currentGame.decrementScore(); 
       final Handler handle = new Handler(); 
       Runnable delay = new Runnable() { 
        public void run() { 
         processScreen(); 
        } 
       }; 
       handle.postDelayed(delay,3000); 
       } 

       else if(currentGame.getRound()==19) 
       { 
         nextBtn1.setEnabled(false); 
         nextBtn2.setEnabled(false); 
         nextBtn3.setEnabled(false); 
         nextBtn4.setEnabled(false); 
         nextBtn5.setEnabled(false); 
         currentGame.decrementScore(); 
         final Handler handle = new Handler(); 
         Toast.makeText(QuestionActivity.this, "Time's Up", Toast.LENGTH_SHORT).show(); 
         Runnable delay = new Runnable() { 
          public void run() { 
           processScreen(); 
          } 
         }; 
         handle.postDelayed(delay,3000); 
       } 
      } 

      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) 
    { 
     nextBtn1.setEnabled(false); 
     nextBtn2.setEnabled(false); 
     nextBtn3.setEnabled(false); 
     nextBtn4.setEnabled(false); 
     nextBtn5.setEnabled(false); 
     arg0.setEnabled(true); 
     //Log.d("Questions", "Moving to next question"); 
     if(arg0.getId()==R.id.answer5) 
     {  
      Button yes, no; 
      final Dialog dialog = new Dialog(this, R.style.FullHeightDialog); //this is a reference to the style above 
      dialog.setContentView(R.layout.dialog1); //I saved the xml file above as yesnomessage.xml 
      dialog.setCancelable(true); 

      //to set the message 
      TextView message =(TextView) dialog.findViewById(R.id.tvmessagedialogtext); 
      message.setText("Are you sure you want to Exit?"); 
      yes = (Button) dialog.findViewById(R.id.bmessageDialogYes); 
      yes.setOnClickListener(new OnClickListener() { 
      public void onClick(View v) 
      { 
      counterTimer.cancel(); 
      finish(); 
      startActivity(new Intent(QuestionActivity.this, SplashActivity.class));    
      } 
         }); 

      no = (Button) dialog.findViewById(R.id.bmessageDialogNo); 
      no.setOnClickListener(new OnClickListener() { 
      public void onClick(View v) 
      { 
      dialog.dismiss(); 
      nextBtn1.setEnabled(true); 
      nextBtn2.setEnabled(true); 
      nextBtn3.setEnabled(true); 
      nextBtn4.setEnabled(true); 
      } 
         }); 
      dialog.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()); 
      final Handler handle = new Handler(); 
      Runnable delay = new Runnable() { 
       public void run() { 
        startActivity(new Intent(QuestionActivity.this, EndgameActivity.class)); 
        finish(); 
       } 
      }; 
      handle.postDelayed(delay,2000); 

     } 
      else 
      { 
       final Handler handle = new Handler(); 
       Runnable delay = new Runnable() { 
        public void run() { 
        startActivity(new Intent(QuestionActivity.this, QuestionActivity.class)); 
        finish(); 
        } 
       }; 
       handle.postDelayed(delay,2000); 
         } 
        } 
       } 


    @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) { 
     final 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!"); 
       Toast.makeText(QuestionActivity.this, "Correct Answer", Toast.LENGTH_SHORT).show(); 
       currentGame.incrementScore(); 
       } 

      else{ 
       b.setBackgroundResource(R.drawable.ansred); 
       //Log.d("Questions", "Incorrect Answer!"); 
       Toast.makeText(QuestionActivity.this, "Incorrect Answer", Toast.LENGTH_SHORT).show(); 
       currentGame.decrementScore1(); 
          } 
      return true; 
     } 

    public void show() 
    { 
    counterTimer.cancel();   
    } 

} 

Answer 1

你好做这样的事情觉得─

package com.example.dialogboxwithtimer; 

import android.app.Activity; 
import android.app.AlertDialog; 
import android.content.DialogInterface; 
import android.os.Bundle; 
import android.os.Handler; 
import android.os.SystemClock; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.TextView; 
import android.widget.Toast; 

public class MainActivity extends Activity { 
    private TextView textTimer; 
    private Button startButton; 
    private Button pauseButton; 
    private long startTime = 0L; 
    private Handler myHandler = new Handler(); 
    long timeInMillies = 0L; 
    long timeSwap = 0L; 
    long finalTime = 0L; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     Button btn = (Button) findViewById(R.id.button1); 

     textTimer = (TextView) findViewById(R.id.textTimer); 

     startButton = (Button) findViewById(R.id.btnStart); 
     startButton.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View view) { 
       startTime = SystemClock.uptimeMillis(); 
       myHandler.postDelayed(updateTimerMethod, 0); 

      } 
     }); 

     pauseButton = (Button) findViewById(R.id.btnPause); 
     pauseButton.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View view) { 
       timeSwap += timeInMillies; 
       myHandler.removeCallbacks(updateTimerMethod); 

      } 
     }); 

     btn.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       alertMessage(); 
       timeSwap += timeInMillies; 
       myHandler.removeCallbacks(updateTimerMethod); 
      } 
     }); 
    } 

    public void alertMessage() { 
     DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() { 
      public void onClick(DialogInterface dialog, int which) { 
       switch (which) { 
       case DialogInterface.BUTTON_POSITIVE: 
        // Yes button clicked 

        Toast.makeText(MainActivity.this, "Yes Clicked", 
          Toast.LENGTH_LONG).show(); 
        break; 

       case DialogInterface.BUTTON_NEGATIVE: 
        // No button clicked 
        // do nothing 
        startTime = SystemClock.uptimeMillis(); 
        myHandler.postDelayed(updateTimerMethod, 0); 

        Toast.makeText(MainActivity.this, "No Clicked", 
          Toast.LENGTH_LONG).show(); 
        break; 
       } 
      } 
     }; 

     AlertDialog.Builder builder = new AlertDialog.Builder(this); 
     builder.setMessage("Are you sure?") 
       .setPositiveButton("Yes", dialogClickListener) 
       .setNegativeButton("No", dialogClickListener).show(); 
    } 

    private Runnable updateTimerMethod = new Runnable() { 

     public void run() { 
      timeInMillies = SystemClock.uptimeMillis() - startTime; 
      finalTime = timeSwap + timeInMillies; 

      int seconds = (int) (finalTime/1000); 
      int minutes = seconds/60; 
      seconds = seconds % 60; 
      int milliseconds = (int) (finalTime % 1000); 
      textTimer.setText("" + minutes + ":" 
        + String.format("%02d", seconds) + ":" 
        + String.format("%03d", milliseconds)); 
      myHandler.postDelayed(this, 0); 
     } 

    }; 

} 

而在你的布局 -

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="vertical" > 

    <Button 
     android:id="@+id/button1" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:text="Popup" /> 

    <RelativeLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:background="#000000" > 

     <TextView 
      android:id="@+id/textTimer" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_above="@+id/btnPause" 
      android:layout_centerHorizontal="true" 
      android:layout_marginBottom="37dp" 
      android:text="00:00:00" 
      android:textColor="#ffffff" 
      android:textSize="40sp" /> 

     <Button 
      android:id="@+id/btnPause" 
      android:layout_width="90dp" 
      android:layout_height="45dp" 
      android:layout_centerVertical="true" 
      android:layout_toRightOf="@+id/btnStart" 
      android:text="Pause" /> 

     <Button 
      android:id="@+id/btnStart" 
      android:layout_width="90dp" 
      android:layout_height="45dp" 
      android:layout_alignParentLeft="true" 
      android:layout_centerVertical="true" 
      android:layout_marginLeft="48dp" 
      android:text="Start" /> 
    </RelativeLayout> 

</LinearLayout> 

如需更多帮助，看到这些网址 - http://www.androidhub4you.com/2013/04/countdown-demo-in-android-custom-timer.html 和 http://www.androidhub4you.com/2012/09/alert-dialog-box-or-confirmation-box-in.html

块引用