文本视图中的倒计时计时器

Question

我写了这段代码，当我点击btnGetPincode时，一个60秒的倒计时计时器开始运行。但它没有发生，textview中的结果=00:00，什么也没发生。为什么？

这是我的代码：

btnGetPinCode.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
btnGetPinCode.setClickable(false);
btnGetPinCode.setBackgroundResource((R.drawable.button4));
txtShowPinCode.setVisibility(View.VISIBLE);
//initialize timer duration
long duration = TimeUnit.MINUTES.toMillis(1);
//initialize timer countdown timer
new CountDownTimer(duration, 1000) {
@Override
public void onTick(long millisUntilFinished) {
String duration2 = String.format(Locale.ENGLISH, "%02d : %02d"
, TimeUnit.MILLISECONDS.toMinutes(1)
, TimeUnit.MILLISECONDS.toSeconds(1) -
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(1)));
//set converted time to textView
txtTimer.setVisibility(View.VISIBLE);
txtTimer.setText(duration2+"");
btnOk.setText(duration2);
}
@Override
public void onFinish() {
//when timer finished, hide text view
txtTimer.setVisibility(View.INVISIBLE);
btnGetPinCode.setBackgroundResource(R.drawable.button);
btnGetPinCode.setClickable(true);
}
}.start();
});

}

Answer 1

问题：您在duration2变量的每个参数中设置了1，因此TextView永远不会更改，您需要设置每个计时器刻度上更改的实际值，这是onTick()方法的参数>gt；millisUntilFinished

将计时器更改为：

new CountDownTimer(duration, 1000) {
@Override
public void onTick(long millisUntilFinished) {
String duration2 = String.format(Locale.ENGLISH, "%02d : %02d"
, TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished) //<<<<< change here
, TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) - //<<<< change here
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished))); //<<<<< change here
//set converted time to textView
txtTimer.setVisibility(View.VISIBLE);
txtTimer.setText(duration2+"");
btnOk.setText(duration2);
}
@Override
public void onFinish() {
//when timer finished, hide text view
txtTimer.setVisibility(View.INVISIBLE);
btnGetPinCode.setBackgroundResource(R.drawable.button);
btnGetPinCode.setClickable(true);
}
}.start();

Answer 2

主要问题在于时间duration2的计算

//Declare timer
CountDownTimer cTimer = null;
cTimer  = new CountDownTimer(duration, 1000) {
@Override
public void onTick(long millisUntilFinished) {
String duration2 = String.format(Locale.ENGLISH, "%02d : %02d"
, TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished) //Here is the problem
, TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) - //Here is the problem
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished))); //<<<<< change here
//set converted time to textView
txtTimer.setVisibility(View.VISIBLE);
txtTimer.setText(duration2+"");
btnOk.setText(duration2);
}
@Override
public void onFinish() {
//when timer finished, hide text view
txtTimer.setVisibility(View.INVISIBLE);
btnGetPinCode.setBackgroundResource(R.drawable.button);
btnGetPinCode.setClickable(true);
}
}.start();

您还应该清理引用，以防止内存泄漏。无论何时调用所属Activity/Fragment中的onDestroy((/onDestroyView((，都需要调用cTtimer.cancel((。

void cancelTimer() {
if(cTimer!=null)
cTimer.cancel();
}