我有两个XML的edittext。在一个EditText中，用户可以将一个数字作为分钟，在另一个EditText中，将一个数字作为秒。单击finish按钮后，秒EditText应该开始倒计时，并每秒钟更新一次文本。
此外，我如何才能保持它的更新，直到它达到零分零秒?
当前回答
var futureMinDate = Date()
val sdf = SimpleDateFormat("yyyy-MM-dd", Locale.ENGLISH)
try {
futureMinDate = sdf.parse("2019-08-22")
} catch (e: ParseException) {
e.printStackTrace()
}
// Here futureMinDate.time Returns the number of milliseconds since January 1, 1970, 00:00:00 GM
// So we need to subtract the millis from current millis to get actual millis
object : CountDownTimer(futureMinDate.time - System.currentTimeMillis(), 1000) {
override fun onTick(millisUntilFinished: Long) {
val sec = (millisUntilFinished / 1000) % 60
val min = (millisUntilFinished / (1000 * 60)) % 60
val hr = (millisUntilFinished / (1000 * 60 * 60)) % 24
val day = ((millisUntilFinished / (1000 * 60 * 60)) / 24).toInt()
val formattedTimeStr = if (day > 1) "$day days $hr : $min : $sec"
else "$day day $hr : $min : $sec"
tvFlashDealCountDownTime.text = formattedTimeStr
}
override fun onFinish() {
tvFlashDealCountDownTime.text = "Done!"
}
}.start()
传递一个未来日期并将其转换为毫秒。
其他回答
只需通过传递秒和textview对象调用下面的函数
public void reverseTimer(int Seconds,final TextView tv){
new CountDownTimer(Seconds* 1000+1000, 1000) {
public void onTick(long millisUntilFinished) {
int seconds = (int) (millisUntilFinished / 1000);
int minutes = seconds / 60;
seconds = seconds % 60;
tv.setText("TIME : " + String.format("%02d", minutes)
+ ":" + String.format("%02d", seconds));
}
public void onFinish() {
tv.setText("Completed");
}
}.start();
}
试试这个方法:
private void startTimer() {
startTimer = new CountDownTimer(30000, 1000) {
public void onTick(long millisUntilFinished) {
long sec = (TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) -
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished)));
Log.e(TAG, "onTick: "+sec );
tv_timer.setText(String.format("( %02d SEC )", sec));
if(sec == 1)
{
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
tv_timer.setText("( 00 SEC )");
}
}, 1000);
}
}
public void onFinish() {
tv_timer.setText("Timer finish");
}
}.start();
}
如果您使用以下代码(如已接受的答案所述)，
new CountDownTimer(30000, 1000) {
public void onTick(long millisUntilFinished) {
mTextField.setText("seconds remaining: " + millisUntilFinished / 1000);
//here you can have your logic to set text to edittext
}
public void onFinish() {
mTextField.setText("done!");
}
}.start();
如果不仔细清理引用，将导致使用此代码的活动实例的内存泄漏。
使用以下代码
//Declare timer
CountDownTimer cTimer = null;
//start timer function
void startTimer() {
cTimer = new CountDownTimer(30000, 1000) {
public void onTick(long millisUntilFinished) {
}
public void onFinish() {
}
};
cTimer.start();
}
//cancel timer
void cancelTimer() {
if(cTimer!=null)
cTimer.cancel();
}
你需要调用cTtimer.cancel()每当onDestroy()/onDestroyView()在拥有的活动/片段被调用。
MainActivity.java
package com.zeustechnocrats.countdown;
import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;
import java.text.SimpleDateFormat;
import java.util.Date;
public class MainActivity extends AppCompatActivity {
private String EVENT_DATE_TIME = "2023-12-31 10:30:00";
private String DATE_FORMAT = "yyyy-MM-dd HH:mm:ss";
private LinearLayout linear_layout_1, linear_layout_2;
private TextView tv_days, tv_hour, tv_minute, tv_second;
private Handler handler = new Handler();
private Runnable runnable;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.count_down);
initUI();
countDownStart();
}
private void initUI() {
linear_layout_1 = findViewById(R.id.linear_layout_1);
linear_layout_2 = findViewById(R.id.linear_layout_2);
tv_days = findViewById(R.id.tv_days);
tv_hour = findViewById(R.id.tv_hour);
tv_minute = findViewById(R.id.tv_minute);
tv_second = findViewById(R.id.tv_second);
}
private void countDownStart() {
runnable = new Runnable() {
@Override
public void run() {
try {
handler.postDelayed(this, 1000);
SimpleDateFormat dateFormat = new SimpleDateFormat(DATE_FORMAT);
Date event_date = dateFormat.parse(EVENT_DATE_TIME);
Date current_date = new Date();
if (!current_date.after(event_date)) {
long diff = event_date.getTime() - current_date.getTime();
long Days = diff / (24 * 60 * 60 * 1000);
long Hours = diff / (60 * 60 * 1000) % 24;
long Minutes = diff / (60 * 1000) % 60;
long Seconds = diff / 1000 % 60;
//
tv_days.setText(String.format("%02d", Days));
tv_hour.setText(String.format("%02d", Hours));
tv_minute.setText(String.format("%02d", Minutes));
tv_second.setText(String.format("%02d", Seconds));
} else {
linear_layout_1.setVisibility(View.VISIBLE);
linear_layout_2.setVisibility(View.GONE);
handler.removeCallbacks(runnable);
}
} catch (Exception e) {
e.printStackTrace();
}
}
};
handler.postDelayed(runnable, 0);
}
protected void onStop() {
super.onStop();
handler.removeCallbacks(runnable);
}
}
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/white"
android:orientation="horizontal">
<LinearLayout
android:id="@+id/linear_layout_1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:color/black"
android:gravity="center_horizontal"
android:visibility="gone">
<TextView
android:id="@+id/tv_event"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:text="Android Event Start"
android:textColor="@android:color/white"
android:textSize="20dp"
android:textStyle="normal" />
</LinearLayout>
<LinearLayout
android:id="@+id/linear_layout_2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:color/black"
android:visibility="visible">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="@+id/tv_days"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="00"
android:textColor="@android:color/white"
android:textSize="20dp"
android:textStyle="bold" />
<TextView
android:id="@+id/tv_days_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Days"
android:textColor="@android:color/white"
android:textSize="20dp"
android:textStyle="normal" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="@+id/tv_hour"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="00"
android:textColor="@android:color/white"
android:textSize="20dp"
android:textStyle="bold" />
<TextView
android:id="@+id/tv_hour_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Hour"
android:textColor="@android:color/white"
android:textSize="20dp"
android:textStyle="normal" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="@+id/tv_minute"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="00"
android:textColor="@android:color/white"
android:textSize="20dp"
android:textStyle="bold" />
<TextView
android:id="@+id/tv_minute_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Minute"
android:textColor="@android:color/white"
android:textSize="20dp"
android:textStyle="normal" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="@+id/tv_second"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="00"
android:textColor="@android:color/white"
android:textSize="20dp"
android:textStyle="bold" />
<TextView
android:id="@+id/tv_second_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Second"
android:textColor="@android:color/white"
android:textSize="20dp"
android:textStyle="normal" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
下面是我在Kotlin中使用的解决方案
private fun startTimer()
{
Log.d(TAG, ":startTimer: timeString = '$timeString'")
object : CountDownTimer(TASK_SWITCH_TIMER, 250)
{
override fun onTick(millisUntilFinished: Long)
{
val secondsUntilFinished : Long =
Math.ceil(millisUntilFinished.toDouble()/1000).toLong()
val timeString = "${TimeUnit.SECONDS.toMinutes(secondsUntilFinished)}:" +
"%02d".format(TimeUnit.SECONDS.toSeconds(secondsUntilFinished))
Log.d(TAG, ":startTimer::CountDownTimer:millisUntilFinished = $ttlseconds")
Log.d(TAG, ":startTimer::CountDownTimer:millisUntilFinished = $millisUntilFinished")
}
@SuppressLint("SetTextI18n")
override fun onFinish()
{
timerTxtVw.text = "0:00"
gameStartEndVisibility(true)
}
}.start()
}
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