java - 如果我暂停计时器，我将面临计时器的问题，它不会从停止的地方开始

Question

如果我暂停 chronometer，我会遇到 chronometer 问题，它不会从停止的地方开始。所以我需要从停止的地方开始。在 onlocation 更改方法中，如果米小于 5 米，时间将开始，如果大于 5 米，时间将停止，但不会从停止的地方开始

public class MainActivity{

@Override
public void onLocationChanged(@NonNull Location location) {

        if (mPresenter.getLocalSTATUS() != null && mPresenter.getLocalSTATUS().equalsIgnoreCase(LOCAL_CONTINUE_RIDE))
                    {
                        if(mPresenter.getLocalSTATUS().equalsIgnoreCase(LOCAL_CONTINUE_RIDE))
                        {

                            if (results[0] < 5.09) {
                                cmTimer.start();

                            }
                            else {
                                pauseOffset = SystemClock.elapsedRealtime();
                                cmTimer.stop();

                            }


                        }
                    }

        }

        public void DonePickUpUI_OnClick() {
        if (!resume) {
                            cmTimer.setBase(SystemClock.elapsedRealtime());
                            cmTimer.start();

                        } else {
                            cmTimer.start();
                        }
                        assert cmTimer != null;
                        cmTimer.setOnChronometerTickListener(arg0 -> {
                            if (!resume) {
                                if(mPresenter.getLocalSTATUS().equalsIgnoreCase(LOCAL_START_RIDE)) {
                                    long minute = (((SystemClock.elapsedRealtime() - cmTimer.getBase()) / 1000) / 60);
                                    long second = (((SystemClock.elapsedRealtime() - cmTimer.getBase()) / 1000) % 60);
                                    elapsedTime_Done_pickup = SystemClock.elapsedRealtime();
                                    Log.d(TAG, "onChronometerTick: " + minute + " : " + second);
                                    offline_waiting_time.setText(minute + " : " + second);
                                }
                            } else {
                                if (mPresenter.getLocalSTATUS().equalsIgnoreCase(LOCAL_START_RIDE)) {
                                    long minute = ((elapsedTime_Done_pickup - cmTimer.getBase()) / 1000) / 60;
                                    long second = ((elapsedTime_Done_pickup - cmTimer.getBase()) / 1000) % 60;
                                    elapsedTime_Done_pickup = elapsedTime_Done_pickup + 1000;
                                    Log.d(TAG, "onChronometerTick: " + minute + " : " + second);
                                    offline_waiting_time.setText(minute + " : " + second);
                                    /*offline booking*/
                                }
                            }
                        });
                    /*offline booking*/


                }

         private void startRide_OnCLICK() {

               cmTimer.setOnChronometerTickListener(arg0 -> {
                        if (!resume) {
                            if(mPresenter.getLocalSTATUS().equalsIgnoreCase(LOCAL_CONTINUE_RIDE)) {
                                long minute = (((SystemClock.elapsedRealtime() - cmTimer.getBase()) / 1000) / 60) - elapsedTime_Done_pickup;
                                long second = (((SystemClock.elapsedRealtime() - cmTimer.getBase()) / 1000) % 60) - elapsedTime_Done_pickup;
                                elapsedTime_Done_pickup = SystemClock.elapsedRealtime();
                                Log.d(TAG, "onChronometerTick: " + minute + " : " + second);
                                offline_waiting_time.setText(minute + " : " + second);
                            }
                        } else {
                            if (mPresenter.getLocalSTATUS().equalsIgnoreCase(LOCAL_CONTINUE_RIDE)) {
                                long minute = ((elapsedTime_Done_pickup - cmTimer.getBase()) / 1000) / 60;
                                long second = ((elapsedTime_Done_pickup - cmTimer.getBase()) / 1000) % 60;
                                elapsedTime_Done_pickup = elapsedTime_Done_pickup + 1000;
                                Log.d(TAG, "onChronometerTick: " + minute + " : " + second);
                                offline_waiting_time.setText(minute + " : " + second);
                                /*offline booking*/
                            }
                        }
                    });



         }      


    }}

Answer 1

您需要一个跟踪时间的变量。

long timeWhenStopped = 0;

停止计时器时更新变量的值

timeWhenStopped = cmTimer.getBase() - SystemClock.elapsedRealtime();
cmTimer.stop();

启动前使用此变量调整计时器

cmTimer.setBase(SystemClock.elapsedRealtime() + timeWhenStopped);
cmTimer.start();

最后，如果您有办法重置计时器，那么您应该记住还重置 timeWhenStopped 变量。

cmTimer.setBase(SystemClock.elapsedRealtime());
timeWhenStopped = 0;