Question

我有活动A和B.当我在活动A中暂停计时器时，它会停止计时器，我想在活动B中启动恢复按钮时再次恢复它。我已经看过教程，但我刚刚找到教程在同一活动中。

活动A有倒数计时器和暂停按钮：

    // implements CountdownTimer
    final CountDownTimer timer = new CountDownTimer(30000, 1000) {
        TextView timeLeft = (TextView) findViewById(R.id.time_left_value);

        public void onTick(long millisUntilFinished) {
            timeLeft.setText("" + millisUntilFinished / 1000);
        }

        public void onFinish() {
        //  TODO: set intent to next screen
        Intent i = new Intent(A.this, C.class);
        startActivity(i);
        }
    }.start();


    // Pause Button
    Button pause_btn = (Button) findViewById(R.id.pause_btn);
    pause_btn.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View arg0) {
            //Move to the next view!
            Intent i = new Intent(A.this, B.class);
            startActivity(i);
            timer.cancel();
        }
    });

活动B有简历按钮：

    Button resume_btn = (Button) findViewById(R.id.resume_btn);
    resume_btn.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View arg0) {
                //Move to the next view!
                finish();
            }
        });

Answer 1

如果没有被误解，你可以添加以下内容：

跟踪＆＃34;时间＆＃34;并在取消之前将其归还：

private class MyCountDownTimer extends CountDownTimer{
        TextView timeLeft = (TextView) findViewById(R.id.time_left_value);
        private long  millisUntilFinished = -1;
        public void onTick(long millisUntilFinished) {
            timeLeft.setText("" + millisUntilFinished / 1000);
            this.millisUntilFinished = millisUntilFinished;
        }

        public long getMillisUntilFinished() {
          return millisUntilFinished;
        }

        public void onFinish() {
          millisUntilFinished = -1;
        //  TODO: set intent to next screen
        Intent i = new Intent(A.this, C.class);
        startActivity(i);
        }
    }



final MyCountDownTimer timer = new MyCountDownTimer(30000, 1000)

在开始ActivityB之前，取消时间并致电timer.getMillisUntilFinished()，将值放入Intent并将其传递给ActivityB
如果是value != -1，那么算一算，创建一个新的CountDownTimer并使用新值启动它

编辑：第2点示例：

pause_btn.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View arg0) {
            //Move to the next view!
            Intent i = new Intent(A.this, B.class);
            i.putExtra("time_left",timer.getMillisUntilFinished());
            startActivity(i);
            timer.cancel();
        }
});

Answer 2

活动A

pause_btn.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View arg0) {
            //Move to the next view!
            Intent i = new Intent(A.this, B.class);
            i.putExtra("time_left",timeLeft);
            startActivity(i);
            timer.cancel();
        }
});

关于活动B

long timeLeft = getIntent().getExtras().getLong("time_left");

Button resume_btn = (Button) findViewById(R.id.resume_btn);
resume_btn.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View arg0) {
                final CountDownTimer timer = new CountDownTimer(timeLeft , 1000) {
                       //your code
                }.start();
    }


                finish();
           }
});

一旦取消定时器任务并恢复它，如何访问定时器值？

2 个答案: