Question

我正在创建测验应用程序。我在测验活动中有一个倒计时计时器。我想在两者之间显示一个对话框/警报框。打开对话框时，倒数计时器将停止。但是当对话框关闭时，倒数计时器无法再次启动。请帮忙。

这是我的代码

btnHint.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                 timer.cancel();// working fine
                final AlertDialog.Builder dialog = new AlertDialog.Builder(QuizActivity.this);
                dialog.setTitle("Read Carefully");
                dialog.setMessage(c.getString(7));
                dialog.setNegativeButton("Exit Hint", null);
                dialog.show();
                //how to start TIMER again after clicking 'Exit Hint'

                    }


                            });

我已经在onCreate中定义了一个倒数计时器，如下所示：

timer = new CountDownTimer(90000, 1000) {
            @Override
            public void onTick(long millisUntilFinished) {
                String time = String.valueOf(millisUntilFinished / 1000);
                tvClock.setText("Time" + "\n" + time + "/90");
                int seconds = (int) (millisUntilFinished / 1000);
                if (seconds >= 31) {
                    tvClock.setBackgroundResource(R.drawable.boxgreen);
                } else if (seconds >= 16) {
                    tvClock.setBackgroundResource(R.drawable.boxyellow);
                } else {
                    tvClock.setBackgroundResource(R.drawable.boxred);

                }
            }

Answer 1

首先，您必须将CountDownTimer的milis保存到变量中，因为timer.cancel();会重置计时器。然后，为否定按钮创建onClickListener，在其中使用保存的milis重新创建计时器。

CountDownTimer timer = new CountDownTimer(10000, 10) {   //timer will count down 10 seconds and save time every 10ms
                    @Override
                    public void onTick(long millisUntilFinished) {
                        milis = millisUntilFinished;
                        //save time into field milis 
                        //Update your view with progress here
                    }

                    @Override
                    public void onFinish() {

                    }
                };
                timer.start();
                btnHint.setOnClickListener(new View.OnClickListener() {

                    @Override
                    public void onClick(View v) {
                        timer.cancel();// working fine
                        final AlertDialog.Builder dialog = new AlertDialog.Builder(QuizActivity.this);
                        dialog.setTitle("Read Carefully");
                        dialog.setMessage(c.getString(7));
                        dialog.setNegativeButton("Exit Hint", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                timer = new CountDownTimer(milis, 10) {
                                    @Override
                                    public void onTick(long millisUntilFinished) {

                                         milis = millisUntilFinished;  
                                         //save time again if you want to pause it again
                        //Update your view with progress here
                                    }

                                    @Override
                                    public void onFinish() {

                                    }
                                };
                                timer.start();
                            }
                        });
                        dialog.show();
                    }


                });

关闭对话框/警报框后如何恢复倒数计时器

1 个答案: