java - Android Java 取消 CountDownTimer 的问题

Question

当我通过按下返回按钮(调用 onBackPressed())关闭我的应用程序时，CountDownTimer 不会停止，直到完成计数。如何将 CountDownTimer cancel(); 放入我的 onBackPressed() 中？

因为，当我退出我的应用程序时(下面显示了描述)，我不想再在我的屏幕上出现柜台 toast 。

在我的代码之上:

boolean network_connected = false;

我的 onCreate() 中有什么:

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 CountDownTimer 的全局对象，例如。

在 main_activity 类集之上:CountDownTimer 计时器； 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
}

并在 onBackPressed 上调用 timer.cancel(); 就像

@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();
}