使用 JAVA 在 Android Studio 中简单倒计时 [英] Simple Countdown in Android Studio using JAVA
问题描述
我正在尝试使用 java
在 Android Studio 中制作简单的 60 秒倒数计时器.唯一的问题是它看起来像这样:00:60".但我希望它是这样的:60".而且我想在计时器达到 0 时立即重置并切换到另一个类.当我访问这个计时器活动时,我希望它再次启动计时器等等......这是我的 java
代码:
I'm trying to make simple 60seconds countdown timer in Android Studio using java
. Only problem is that it appears like this: "00:60". But I want it to be like this: "60". And also I want to reset and switch to another class as soon as timer hits 0. And when I visit this timer activity I want it to start timer again and so on... Here's my java
code:
public class BeginAfter extends AppCompatActivity {
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_begin_after);
textView = findViewById(R.id.timer);
long duration = TimeUnit.MINUTES.toMillis(1);
new CountDownTimer(duration, 1000){
@Override
public void onTick(long l) {
String sDuration = String.format(Locale.ENGLISH,"%02d : %02d"
,TimeUnit.MILLISECONDS.toMinutes(l)
,TimeUnit.MILLISECONDS.toSeconds(l) -
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(l)));
textView.setText(sDuration);
}
@Override
public void onFinish() {
textView.setVisibility(View.INVISIBLE);
}
}.start();
}
}
这是我的 xml
代码:
<TextView
android:id="@+id/timer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#d10e00"
android:textSize="37dp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.064" />
推荐答案
尝试:
String sDuration =
String.format(
Locale.ENGLISH,
"%02d",
TimeUnit.MILLISECONDS.toSeconds(l) -
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(l))
);
这会将字符串 "%02d"
中的 %02d
替换为 String.format 的以下参数中的第一个给定整数,并尝试仅显示它2 位数.
This will replace %02d
in the String "%02d"
with the first given integer in the following arguments of String.format and try to display it with only 2 digits.
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