Android Studio如何操作CountDownTimer

Question

我想暂停使用布尔CountDownTimer当按下暂停按钮tvTimer时会发生什么停止更新时间，但倒计时器连续计数然后当我按下恢复按钮时tvTimer更新countdowntimer状态on在那里它真的像例如countdowntimer开始说30 29 28然后暂停tvTimer在28停止，但真的倒计时器仍然工作，然后可以说countdowntimer现在在25，但textview仍然在28右？然后我按简历显示计时器的textview更新到25，在那里的倒计时是我想我只是想念一个代码来停止countdowntimer ....我真的不知道它是什么T_T将你们帮助我tho

package org.intercode.lifeatceu; 

import android.app.AlertDialog; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.graphics.Color; 
import android.media.MediaPlayer; 
import android.os.Bundle; 
import android.os.CountDownTimer; 
import android.provider.MediaStore; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.view.View; 
import android.widget.Button; 
import android.widget.LinearLayout; 
import android.widget.RadioButton; 
import android.widget.RadioGroup; 
import android.widget.TextView; 
import android.widget.Toast; 

import org.w3c.dom.Text; 

import java.util.HashSet; 
import java.util.Random; 

public class levelone extends AppCompatActivity { 
TextView tv1, tvCred, tvQuestion, tvTimer; 
Button btNext, btPause ,btResume; 
RadioButton rb1, rb2; 
RadioGroup rg; 
LinearLayout ll; 
CountDownTimer timer; 

String questions[] = 
     { 
       "Dr. Ma Cristina D. Padolina is the President and Chief Academic Officer", 
       "Mr. Irineo C. Espino is the Vice President for Academic Affairs", 
       "Dr. Teresa R. Perez is the Vice President for Administration and Information Officer", 
       "Ms. Corazon M. Tiongco is thr Asst. Treasurer and Procurement Dept. Head", 
       "Dr. Rhoda C. Aguilar is the University Registrar", 
       "Dr. Olivia M. Limuaca is the Vice President of Malolos Campus", 
       "Dr. Ma. Flordeliza L. Anastacio is the Vice President of Makati Campus", 
       "Dr. Maria Clara Perlita Erna V. Yabut is the Vice President for Research & Evaluation", 
       "Dr. Carlito B. Olaer is the Vice President for Student Affairs", 
       "Ms. Bernardita T. Traje is the Asst. Comptroller", 
       "Mr. Cesar F. Tan is the Treasurer, Asst. Corporate Secretary & Asst. Compliance Officer", 
       "Justice Josue N. Bellosillo is the Dean of School of Law and Jurisprudence at CEU MAKATI", 
       "Mr. Marcial L. Anacio is the Program head of Computer Science and Information Tech. Department at CEU MAKATI", 
       "Atty. Rita Linda V. Jimeno is the Associate Dean of School of Law and Jurisprudence at CEU MAKATI", 
       "Dr. Teresita I. Barcelona is the dean of Nursing at CEU MANILA", 
       "Dr. Cecilia C. Uncad is the Dean of Optometry at CEU MANILA", 
       "Dr. Jessica L. Flor-Torre is the Dean of Nutrition and Hospitality Management at CEU MANILA", 
       "Dean Melito S. Salazar, Jr. is the dean of Accountancy and Management at CEU MANILA", 
       "Dr. Charito M. Bermido is the dean of Medical Technology at CEU MANILA", 
       "Dr. Teresita G. Carey is the Dean of Science and Technology at CEU MANILA", 
       "Dr. Julieta Z. Dungca is the Dean of Educational, Liberal, Arts, Music, Social Wok at CEU MANILA", 
       "Dr. Pearly P. Lim is the Dean of Pharmacy at CEU MANILA", 
       "Dr. Cecilla D, Santiago is the Dean of Dentistry at CEU MANILA", 
       "Dr. Milagros L. Borabo is the Director of Professional and Continuing Educational(PACE)", 
       "Dr. Ma. Flordeliza L. Anastacio is the Vice President and Dean of Studies at CEU MALOLOS", 
       "Dr. Nilo V. Francisco is the Dean of Management and Technology at CEU MALOLOS", 
       "Dr. Elizabeth C. Roces is the Dean of Education, Liberal Arts and Science at CEU MALOLOS", 
       "Ms. Veronica F. Balintona is the Asst. Dean of Nutrition and Hospitality management at CEU MANILA", 
       "Mrs. Elvira L. Urgel is the Asst. Dean of Nursing at CEU MANILA", 
       "Dr. Aileen C. Patron is the Asst. Dean of Medical Technology at CEU MANILA", 
       "Dr. Juliana M. Laraya is the Asst. Dean of Educational, Liberal Arts, Music, Social Work at CEU MANILA", 
       "Mrs. Emma C. Castro is the Administrative Officer (General Services) at CEU MAKITA", 
       "Mrs Julie L. Ibe is the Academic Coordinator of Cash Division at CEU MALOLOS", 
       "Mrs. Ma. Armela Pamiloza is the Academic Coordinator Level III Nursing at CEU MALOLOS", 
       "Mrs. Rosa M. Quizon is the Academic Coordinator of Level II Nursing at CEU MALOLOS", 
       "Mrs. Luningning O. Marcelino is the Academic Coordinator Library Section at CEU MALOLOS", 
       "Mrs. Jemelyn O. Garcia is the Academic Coordinator of Community Outreach Section at CEU MALOLOS", 
       "Mrs. Shella Marie S. Ignacio is the Head of Tourism Program at CEU MALOLOS", 
       "Mrs. Marietta C. Alvarez is the Head of Liberal Arts Program/ Mass Communication Laboratory at CEU MALOLOS", 
       "Mrs. Amelia T. Valencia is the head of Marketing Placement at CEU MALOLOS", 
       "Mrs. Elvira G. Borlongan is the head of Registrar at CEU MALOLOS", 
       "Mrs. Ada Ruth A. Aguasian is the Academic Coordinator of Tourism Management at CEU MAKATI", 
       "Dr. Maria Wanda I. Martinez is the Academic Coordinator of Community Nursing at CEU MAKATI", 
       "Mr. Rommel Rufuz A. Lopez is the Academic Coordinator of Clinical Dentistry at CEU MAKATI", 
       "Dr. Amelita M. Borlongan is the Academic Coordinator of Research at CEU MAKATI", 
       "Ms. Annabelle is the Academic Coordinator of Physical Education at CEU MAKATI", 
       "Mrs. Maria Victoria S. Coloma is the Academic Coordinator of Clinical Nursing at CEU MAKATI", 
       "Dr. Maria Corazon L. Andoy is the Assistant to the Vice President at CEU MAKATI", 
       "Mrs. Eleanor C. Reyes is the Coordinator of Science Laboratory at CEU MALOLOS", 
       "Dr. Flora L. Camay is the Program Head of Alumni Relation and Education at CEU MALOLOS" 
     }; 
String answer[] = 
     { 
       "True",//1 
       "False",//2 
       "False",//3 
       "True",//4 
       "True",//5 
       "False",//6 
       "False",//7 
       "True",//8 
       "True",//9 
       "True",//10 
       "True",//11 
       "True",//12 
       "True",//13 
       "True",//14 
       "True",//15 
       "False",//16 
       "False",//17 
       "True",//18 
       "True",//19 
       "False",//20 
       "False",//21 
       "False",//22 
       "False",//23 
       "True",//24 
       "True",//25 
       "True",//26 
       "True",//27 
       "True",//28 
       "True",//29 
       "True",//30 
       "True",//31 
       "True",//32 
       "False",//33 
       "True",//34 
       "False",//35 
       "False",//36 
       "False",//37 
       "True",//38 
       "True",//39 
       "False",//40 
       "False",//41 
       "True",//42 
       "False",//43 
       "False",//44 
       "True",//45 
       "True",//46 
       "True",//47 
       "True",//48 
       "True",//49 
       "True",//50 

     }; 
HashSet numbers = new HashSet(); 


int flag = 0; 
Random rnd = new Random(); 
int flag2 = 0; 
int correct = 0; 
int wrong = 0; 
int coins = 0; 
int time = 0; 
int credit = 0; 

private boolean isPaused = false; 
private long timeremaining = 0; 

String Executives = "lock"; 
String Liberators = "lock"; 
String Travellers = "lock"; 
String Specialist = "lock"; 
MediaPlayer mpTimer; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_levelone); 
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 

    isPaused = false; 

    SharedPreferences loadGame = getSharedPreferences("Game", MODE_PRIVATE); 
    credit = loadGame.getInt("savedPlayerCredit", 0); 
    time = loadGame.getInt("savedPlayerTime", 0); 

    SharedPreferences loadGame2 = getSharedPreferences("Theme", MODE_PRIVATE); 
    Executives = loadGame2.getString("Executives", "lock"); 
    Liberators = loadGame2.getString("Liberators", "lock"); 
    Specialist = loadGame2.getString("Specialist", "lock"); 
    Travellers = loadGame2.getString("Travellers", "lock"); 

    final MediaPlayer mpWrong = MediaPlayer.create(this, R.raw.wrong); 
    final MediaPlayer mpCorrect = MediaPlayer.create(this, R.raw.correct); 
    final MediaPlayer mpNormal = MediaPlayer.create(this, R.raw.normal); 
    mpTimer = MediaPlayer.create(this, R.raw.timer); 


    tv1 = (TextView) findViewById(R.id.tv1); 
    tvCred = (TextView) findViewById(R.id.tvCred); 
    tvQuestion = (TextView) findViewById(R.id.tvQuestion); 
    tvTimer = (TextView) findViewById(R.id.tvTimer); 

    rb1 = (RadioButton) findViewById(R.id.rb1); 
    rb2 = (RadioButton) findViewById(R.id.rb2); 
    rg = (RadioGroup) findViewById(R.id.rg); 

    btNext = (Button) findViewById(R.id.btNext); 
    btPause = (Button) findViewById(R.id.btPause); 
    btResume = (Button) findViewById(R.id.btResume); 
    btNext.setBackgroundResource(R.drawable.next); 

    ll = (LinearLayout) findViewById(R.id.ll); 

    if (Executives.equals("active")) { 
     time = time + 5000; 
    } else if (Liberators.equals("active")) { 
     coins = coins + 20; 
    } else if (Travellers.equals("active")) { 
     time = time + 5000; 
    } else if (Specialist.equals("active")) { 
     coins = coins + 20; 
    } else { 
     Toast.makeText(this, "Go!", Toast.LENGTH_SHORT).show(); 
    } 

    flag2 = rnd.nextInt(50); 
    numbers.add(flag2); 
    tvQuestion.setText(questions[flag2]); 
    tvCred.setText(String.valueOf(credit)); 
    mpTimer.start(); 


    timer = new CountDownTimer(time, 1000) { 
     public void onTick(long millisUntilFinished) { 
      if(isPaused) 
      { 
       timer.cancel(); 
      } 
      else 
      { 
       tvTimer.setText("" + millisUntilFinished/1000); 
       timeremaining=millisUntilFinished; 
      } 
     } 

     @Override 
     public void onFinish() { 

      Intent inResult = new Intent(getApplicationContext(), Results.class); 
      SharedPreferences saveGame = getSharedPreferences("Game", MODE_PRIVATE); 
      SharedPreferences.Editor editor = saveGame.edit(); 
      editor.putInt("savedPlayerCredit", credit); 
      editor.putInt("savedPlayerCoins", coins); 
      editor.putInt("savedPlayerCorrect", correct); 
      editor.putInt("savedPlayerWrong", wrong); 
      editor.apply(); 
      startActivity(inResult); 
      mpTimer.stop(); 
     } 
    }.start(); 

      btNext.setOnClickListener(new View.OnClickListener() { 
            @Override 
            public void onClick(View v) { 
             btNext.setBackgroundResource(R.drawable.nextonclick); 
             if (rg.getCheckedRadioButtonId() == -1) { 
              Toast.makeText(getApplicationContext(), "Choose an Answer", Toast.LENGTH_LONG).show(); 
             } else { 
              RadioButton uans = (RadioButton) findViewById(rg.getCheckedRadioButtonId()); 
              String ansText = uans.getText().toString(); 
              if (ansText.equalsIgnoreCase(answer[flag2])) { 
               while (numbers.contains(flag2)) { 
                flag2 = rnd.nextInt(50); 
               } 
               correct++; 
               coins++; 
               mpCorrect.start(); 
               Toast.makeText(getApplicationContext(), "Correct!", Toast.LENGTH_SHORT).show(); 
              } else { 
               wrong++; 
               mpWrong.start(); 
               Toast.makeText(getApplicationContext(), "Wrong!", Toast.LENGTH_SHORT).show(); 
              } 
              flag++; 
              flag2 = rnd.nextInt(50); 

              if (flag < questions.length) { 
               tvQuestion.setText(questions[flag2]); 
               rb1.setChecked(false); 
               rb2.setChecked(false); 
               rg.clearCheck(); 
               btNext.setBackgroundResource(R.drawable.next); 
              } else { 
               Intent inResult = new Intent(getApplicationContext(), Results.class); 
               SharedPreferences saveGame = getSharedPreferences("Game", MODE_PRIVATE); 
               SharedPreferences.Editor editor = saveGame.edit(); 
               editor.putInt("savedPlayerCredit", credit); 
               editor.putInt("savedPlayerCoins", coins + 100); 
               editor.putInt("savedPlayerCorrect", correct); 
               editor.putInt("savedPlayerWrong", wrong); 
               editor.apply(); 
               timer.cancel(); 
               startActivity(inResult); 
               mpTimer.stop(); 
              } 
             } 
             mpNormal.start(); 
            } 
           }); 
    btPause.setOnClickListener(new View.OnClickListener() 
    { 
     @Override 
     public void onClick(View v) { 
      isPaused = true; 
      mpTimer.stop(); 
     } 
    }); 
    btResume.setOnClickListener(new View.OnClickListener() 
    { 
     @Override 
     public void onClick(View v){ 
      isPaused = false; 
      mpTimer.start(); 
     } 
    }); 
} 

@Override 
public void onBackPressed() { 
    AlertDialog.Builder builder = new AlertDialog.Builder(this); 

    builder.setTitle("Quit"); 
    builder.setMessage("Are you sure you want to Quit?"); 

    builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() { 

     public void onClick(DialogInterface dialog, int which) { 
      timer.onFinish(); 
     } 
    }); 
    builder.setNegativeButton("No", new DialogInterface.OnClickListener() { 

     @Override 
     public void onClick(DialogInterface dialog, int which) { 

      dialog.dismiss(); 
     } 
    }); 

    AlertDialog alert = builder.create(); 
    alert.show(); 
} 

@Override 
protected void onStop() { 
    super.onStop(); 
    timer.cancel(); 
    mpTimer.stop(); 
} 

@Override 
protected void onUserLeaveHint() { 
    super.onUserLeaveHint(); 

} 
    } 

Answer 1

这就是我该怎么做的。我会添加一些onTick处理程序来保存你的班级中的计时器的进度（类似于timeLeft = millisUntilFinished/1000;）

如果要暂停计时器，请执行timer.cancel()。而当您想要继续运行定时器时，请创建一个剩余毫秒数的新定时器。

这样，您不必担心计时器是否应该暂停运行，并将额外的值传递给CountDownTimer。

编辑：

您可以创建一个私有方法来创建一个新的CountDownTimer当你需要它：

private CountDownTimer createTimer(int time){ 
return new CountDownTimer(time*1000, 1000) { 
    @Override 
     public void onTick(long millisUntilFinished) { 
      tvTimer.setText("" + millisUntilFinished/1000); 
      timeLeft = millisUntilFinished/1000; 
    } 

    @Override 
    public void onFinish() { 
     //Do what you want, cancel the timer... 
    } 
}.start(); 

添加一个全局变量

private CountDownTimer timer; 

而且当过你需要创建一个CountDownTimer来做：

timer = createCountDownTimer(yourTime); 

如果要暂停做timer.cancel();