取消CountDownTimer Android Java的问题

Question

当我通过按BACK按钮（调用onBackPressed（））关闭应用程序时，CountDownTimer它不会停止，直到完成计数为止。我怎样才能把CountDownTimer
cancel（）; 在我的onBackPressed()？

因为，当我退出应用程序时（如下面的说明所示），我不再想要在屏幕上进行举杯了。

在我的代码之上：

boolean network_connected = false;

我的是什么onCreate()：

if (check_network.isInternetAvailable(this)) {
    network_connected = true;
    new connect_task_main().execute("");
} else {
    network_connected = false;
}

if (network_connected == false) {
    new CountDownTimer(11000, 1000) {
        public void onTick(long millisUntilFinished) {
            global.toast.setText("No Internet Connection!" + "\n" + "Automatic Refresh In: " + millisUntilFinished / 1000); //set text for toast
            global.toast.show(); //show toast
        }

        public void onFinish() {
            if (network_connected == false) {
                global.cancel_toast(0); //stop all toasts
                finish(); //quit activity
                startActivity(new Intent(main_activity.this, main_activity.class)); //start activity
            } else {
            }
        }
    }.start(); //start the countdowntimer
} else {
    network_connected = true;
}

onBackPressed() 方法

@Override
public void onBackPressed() {
    if (page_number > global.page_number_min) { //does not matter
        page_number--; //does not matter
        global.cancel_toast(0); //stop all toasts
        network_connected = true;
        finish();
    } else {
        global.cancel_toast(0);
        network_connected = true;
        finish(); //quit activity
        super.onBackPressed(); //quit application
    }
}

谢谢。

Answer 1

创建一个CountDownTimer例如的全局对象。

在main_activity类的顶部设置：CountDownTimer timer;之后，执行以下操作。

timer = new CountDownTimer(11000, 1000) 
        {
           public void onTick(long millisUntilFinished) 
           {
             global.toast.setText("No Internet Connection!" + "\n" + "Automatic Refresh In: " + millisUntilFinished / 1000); //set text for toast
             global.toast.show(); //show toast
           }

           public void onFinish() 
           {
              if (network_connected == false) 
              {
                 global.cancel_toast(0); //stop all toasts
                 finish(); //quit activity
                 startActivity(new Intent(main_activity.this, main_activity.class)); //start activity
              }
              else 
              {
              }
          }
      }.start(); //start the countdowntimer
}

并onBackPressed呼吁timer.cancel();像

@Override
public void onBackPressed() 
{
  if (page_number > global.page_number_min) 
  { //does not matter
    page_number--; //does not matter
    global.cancel_toast(0); //stop all toasts
    network_connected = true;
    finish();
  }
  else
  {
    global.cancel_toast(0);
    network_connected = true;
    finish(); //quit activity
    super.onBackPressed(); //quit application
  }

 timer.cancel();
}