當我們點擊主頁按鈕時停止 CountDownTimer

Question

如何在我離開應用程序時停止 CountDownTimer（當我單擊智能手機上的主頁按鈕時）CountDownTimer 仍在運行我嘗試使用此代碼但是當我離開應用程序時，我的智能手機中會出現一條消息“應用程序名稱已停止。 ” 關閉應用程序幫助我請這是我使用的代碼

CountDownTimer timer = new CountDownTimer(120000, 1000) {
        @SuppressLint("DefaultLocale")
        public void onTick(long millisUntilFinished) {
            tv.setText(String.format("%d : %d ",
                    TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished),
                    TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) -
                            TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished))));
        }

        public void onFinish() {
                    AlertDialog.Builder builder1 = new AlertDialog.Builder(MainActivity.this);
                    View view1 = LayoutInflater.from(MainActivity.this).inflate(R.layout.activity_cum, null);
                    TextView title = (TextView) view1.findViewById(R.id.title);
                    TextView message = (TextView) view1.findViewById(R.id.message);
                    ImageView icone = (ImageView) view1.findViewById(R.id.icone);

                    title.setText("Result");
                    icone.setImageResource(R.drawable.smile_lost);
                    message.setText("You have exceeded \n your time of reflection");

                    builder1.setPositiveButton("Replay", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {


                            Intent intent = getIntent();
                            overridePendingTransition(0, 0);
                            intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
                            finish();
                            overridePendingTransition(0, 0);
                            startActivity(intent);

                        }
                    });
                    builder1.setView(view1);
                    builder1.setCancelable(false);
                    AlertDialog alertDialog1 = builder1.create();
                    alertDialog1.show();
                }


        }.start();
}

是onStop()中的代碼

@Override
    public void onStop() {
    super.onStop();

    timer.cancel();
}

Answer 1

我建議兩種方式

1

創建全局變量，如

private isInForgrand = false;

並在 onStop() 或 onPause() 和 onResume() 更改它

@Override
public void onStop() {
    isInForgrand = false;
    super.onStop();
}
@Override
public void onResume() {
    super.onResume();
    isInForgrand = true;
}

並在 onFinish() 檢查它

@Override
        public void onFinish() {
            if(isInForgrand){
               //do what you want  
             }else{
               //your app NOT in Forgrannd
        }

2

您可以在 onStop() 中取消 CountDownTimer

@Override
public void onStop() { 
    super.onStop();
    mCountDownTimer.cancel();
}