android - 如何在 Android 上使用 timeLeft 恢复倒计时？

Question

timeLeft 用于播放音乐文件，但如何与onResume 一起使用？ 所以我可以暂停 Activity ，然后使用剩余计时器继续。

这是我的代码:

public void countdownTimer () {

    final TextView mTextField = (TextView)findViewById(R.id.timer);
    Count = new CountDownTimer(TIMER, 1000) {
        public void onTick(long millisUntilFinished) {

             mTextField.setText("" +(millisUntilFinished / 60000));
             long timeLeft = millisUntilFinished / 1000;
             if(timeLeft <= 4 && timeLeft >=2 && tgbutton.isChecked())
             {
                 mSoundPool.play(sixthMusicFile, 1f, 1f, 1, 0, 1f);
             }
             if(timeLeft <= 1 && tgbutton.isChecked())
             {
                mSoundPool.play(seventhMusicFile, 1f, 1f, 1, 0, 1f);
                vibrate(); 
             }

         }
         public void onFinish() {
             Count.setText("done!");
         }
      }.start();
}

已编辑: 最后，我得到了一些答案。工作代码在这里: Android CountDown Timer with Pause, Resume and Cancel button . 非常感谢之前帮助过我的所有人。

Answer 1

试试这个 Activity :

    public class MyActivity extends AppCompatActivity {

                    long TIMER = 1000000;
                    long timeLeft = 0;
                    private CountDownTimer Count;
                    SharedPreferences sharedPreferences;

                    @Override
                    protected void onCreate(@Nullable Bundle savedInstanceState) {
                        super.onCreate(savedInstanceState);
                        sharedPreferences = getSharedPreferences("App_shared_preferenced", Context.MODE_PRIVATE);

                    }

                    @Override
                    protected void onResume() {
                        super.onResume();
                        timeLeft=  sharedPreferences.getLong("leftTime",0);
                        if(timeLeft>0)
                        countdownTimer(timeLeft);
                        else countdownTimer(TIMER);
                    }

                    @Override
                    protected void onPause() {
                        super.onPause();
                        sharedPreferences.edit().putLong("leftTime",timeLeft).commit();
                        if(Count != null){                                                                
                          Count.cancel();
                        }
                    }

                    public void countdownTimer(long t) {
                          if(Count != null) Count.cancel();
                        final TextView mTextField = null;// Your text view
                        Count = new CountDownTimer(t, 1000) {
                            public void onTick(long millisUntilFinished) {

                                mTextField.setText("" + (millisUntilFinished / 60000));
                                timeLeft = millisUntilFinished / 1000;
                                if (timeLeft <= 4 && timeLeft >= 2 && tgbutton.isChecked()) {
                                    mSoundPool.play(sixthMusicFile, 1f, 1f, 1, 0, 1f);
                                }
                                if (timeLeft <= 1 && tgbutton.isChecked()) {
                                    mSoundPool.play(seventhMusicFile, 1f, 1f, 1, 0, 1f);
                                    vibrate();
                                }
                            }

                            public void onFinish() {
                                Count.setText("done!");
                                timeLeft = 0;
                            }
                        }.start();
                    }
                }