java-如何在Activity中正确设置CountDownTimer

概述请帮忙,我有一个需要暂停和恢复的倒数计时器.我设法通过在onPause中使用.cancel()来暂停计时器,但是我无法使其正确重启.我有两种情况：场景1-它暂停了,但是在重新启动时,即使取消了初始计时器,它似乎也重新启动了两个倒数计时器.publicvoidplayAgain(Viewview){

请帮忙,我有一个需要暂停和恢复的倒数计时器.
我设法通过在onPause中使用.cancel()来暂停计时器,但是我无法使其正确重启.
我有两种情况：
场景1-它暂停了,但是在重新启动时,即使取消了初始计时器,它似乎也重新启动了两个倒数计时器.

    public voID playAgain (VIEw vIEw) {        score = 0;        numberOfQuestions = 0;        timerTextVIEw.setText("60s");        pointsTextVIEw.setText("0/0");        resultTextVIEw.setText("");        playAgainbutton.setVisibility(VIEw.INVISIBLE);        returnToMenu.setVisibility(VIEw.INVISIBLE);        resultdisplayTextVIEw.setVisibility(VIEw.INVISIBLE);        countDownText.setVisibility(VIEw.VISIBLE);        button0.setVisibility(VIEw.INVISIBLE);        button1.setVisibility(VIEw.INVISIBLE);        button2.setVisibility(VIEw.INVISIBLE);        button3.setVisibility(VIEw.INVISIBLE);        sumTextVIEw.setVisibility(VIEw.INVISIBLE);            countDownTimer = new CountDownTimer(millisInFuture, countDownInterval) {                @OverrIDe                public voID onTick(long timeRemain) {                    millisInFuture = timeRemain;                    countDownText.setText(String.valueOf(timeRemain / 1000 - 60));                    if (timeRemain <= 61000) {                        timerTextVIEw.setText(String.valueOf(timeRemain / 1000) + "s");                        button0.setEnabled(true);                        button1.setEnabled(true);                        button2.setEnabled(true);                        button3.setEnabled(true);                        button0.setVisibility(VIEw.VISIBLE);                        button1.setVisibility(VIEw.VISIBLE);                        button2.setVisibility(VIEw.VISIBLE);                        button3.setVisibility(VIEw.VISIBLE);                        sumTextVIEw.setVisibility(VIEw.VISIBLE);                        countDownText.setVisibility(VIEw.INVISIBLE);                    }                }                @OverrIDe                public voID onFinish() {                    timerTextVIEw.setText("0s");                    if (score > 0) {                        percentage = score * 100 / numberOfQuestions;                    } else {                        percentage = 0;                    }                    button0.setEnabled(false);                    button1.setEnabled(false);                    button2.setEnabled(false);                    button3.setEnabled(false);                    playAgainbutton.setVisibility(VIEw.VISIBLE);                    returnToMenu.setVisibility(VIEw.VISIBLE);                    resultdisplayTextVIEw.setVisibility(VIEw.VISIBLE);                    resultTextVIEw.setText(" ");    }            }.start();        generateQuestion();    } @OverrIDe    public voID onPause() {        countDownTimer.cancel();        super.onPause();    }    @OverrIDe    public voID onResume() {        super.onResume();CountDownTimer countDownTimer1 = new CountDownTimer(millisInFuture, countDownInterval) {            @OverrIDe            public voID onTick(long timeRemain) {                millisInFuture = timeRemain;                countDownText.setText(String.valueOf(timeRemain / 1000 - 60));                if (timeRemain <= 61000) {                    timerTextVIEw.setText(String.valueOf(timeRemain / 1000) + "s");                    button0.setEnabled(true);                    button1.setEnabled(true);                    button2.setEnabled(true);                    button3.setEnabled(true);                    button0.setVisibility(VIEw.VISIBLE);                    button1.setVisibility(VIEw.VISIBLE);                    button2.setVisibility(VIEw.VISIBLE);                    button3.setVisibility(VIEw.VISIBLE);                    sumTextVIEw.setVisibility(VIEw.VISIBLE);                    countDownText.setVisibility(VIEw.INVISIBLE);                }            }            @OverrIDe            public voID onFinish() {                timerTextVIEw.setText("0s");                if (score > 0) {                    percentage = score * 100 / numberOfQuestions;                } else {                    percentage = 0;                }                button0.setEnabled(false);                button1.setEnabled(false);                button2.setEnabled(false);                button3.setEnabled(false);                playAgainbutton.setVisibility(VIEw.VISIBLE);                returnToMenu.setVisibility(VIEw.VISIBLE);                resultdisplayTextVIEw.setVisibility(VIEw.VISIBLE);                resultTextVIEw.setText(" ");}        }.start();}

第二种情况只是使系统崩溃：

    public voID playAgain (VIEw vIEw) {        score = 0;        numberOfQuestions = 0;        timerTextVIEw.setText("60s");        pointsTextVIEw.setText("0/0");        resultTextVIEw.setText("");        playAgainbutton.setVisibility(VIEw.INVISIBLE);        returnToMenu.setVisibility(VIEw.INVISIBLE);        resultdisplayTextVIEw.setVisibility(VIEw.INVISIBLE);        countDownText.setVisibility(VIEw.VISIBLE);        button0.setVisibility(VIEw.INVISIBLE);        button1.setVisibility(VIEw.INVISIBLE);        button2.setVisibility(VIEw.INVISIBLE);        button3.setVisibility(VIEw.INVISIBLE);        sumTextVIEw.setVisibility(VIEw.INVISIBLE);            countDownTimer = new CountDownTimer(millisInFuture, countDownInterval) {                @OverrIDe                public voID onTick(long timeRemain) {                    millisInFuture = timeRemain;                    countDownText.setText(String.valueOf(timeRemain / 1000 - 60));                    if (timeRemain <= 61000) {                        timerTextVIEw.setText(String.valueOf(timeRemain / 1000) + "s");                        button0.setEnabled(true);                        button1.setEnabled(true);                        button2.setEnabled(true);                        button3.setEnabled(true);                        button0.setVisibility(VIEw.VISIBLE);                        button1.setVisibility(VIEw.VISIBLE);                        button2.setVisibility(VIEw.VISIBLE);                        button3.setVisibility(VIEw.VISIBLE);                        sumTextVIEw.setVisibility(VIEw.VISIBLE);                        countDownText.setVisibility(VIEw.INVISIBLE);                    }                }                @OverrIDe                public voID onFinish() {                    timerTextVIEw.setText("0s");                    if (score > 0) {                        percentage = score * 100 / numberOfQuestions;                    } else {                        percentage = 0;                    }                    button0.setEnabled(false);                    button1.setEnabled(false);                    button2.setEnabled(false);                    button3.setEnabled(false);                    playAgainbutton.setVisibility(VIEw.VISIBLE);                    returnToMenu.setVisibility(VIEw.VISIBLE);                    resultdisplayTextVIEw.setVisibility(VIEw.VISIBLE);                    resultTextVIEw.setText(" ");    }            }.start();        generateQuestion();    } @OverrIDe    public voID onPause() {        countDownTimer.cancel();        super.onPause();    }    @OverrIDe    public voID onResume() {        super.onResume();countDownTimer.start();}

我已经用谷歌搜索,似乎找不到有效的解决方案.
请帮助,除非此功能有效,否则galaxy store拒绝上传我的apk.

解决方法:

事实是,CountDownTimer是一个相对有限的类.它只有两个方法start()和cancel(),以及两个回调onTick()和onFinish().没有内置的暂停/恢复功能.

我使用TextVIEw设置了一个非常基本的Activity,以可视化CountDownTimer的行为,并且它可以按您想要的方式工作-离开活动时暂停,返回时恢复.我在这里发布了简单的代码：

import androID.os.CountDownTimer;import androID.support.v7.app.AppCompatActivity;import androID.os.Bundle;import androID.Widget.TextVIEw;import java.util.Locale;public class MainActivity extends AppCompatActivity {    private TextVIEw mTextVIEw;    private CountDownTimer mCountDownTimer;    private static final long INTERVAL = 1000L;    private long timeRemaining = 60000L;    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_main);        mTextVIEw = (TextVIEw)findVIEwByID(R.ID.text_vIEw);    }    @OverrIDe    protected voID onResume() {        super.onResume();        mCountDownTimer = new CountDownTimer(timeRemaining, INTERVAL) {            @OverrIDe            public voID onTick(long l) {                mTextVIEw.setText(String.format(Locale.getDefault(), "%d sec.", l / 1000L));                timeRemaining = l;            }            @OverrIDe            public voID onFinish() {                mTextVIEw.setText("Done.");            }        };        mCountDownTimer.start();    }    @OverrIDe    protected voID onPause() {        super.onPause();        mCountDownTimer.cancel();    }}

我将从检查您是否可以运行此代码开始,然后将基本思想集成到您的项目中.本质上,您必须保持CountDownTimer对象之外的剩余时间.

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