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
有Rx的纯溶液，有人可能会感兴趣
数字扩展(Double, Float, Long等):
fun Number.countDownTimer(tick: Long = 1, timeUnit: TimeUnit = TimeUnit.SECONDS): Observable<Long> {
val count = this.toLong()
return Observable.interval(tick, timeUnit)
.take(count)
.map { count - it - 1 }
}
使用
60.countDownTimer().subscribe { textView.text = it }
其他回答
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。
我用kotlin流实现了一个很酷的定时器方法，所以你可以在ViewModel中实现它
var countDownInit = 30
fun countDownTimer() = flow<Int> {
var time = countDownInit
emit(time)
while (true){
time--
delay(1000L)
countDownInit = time
emit(time)
}
}
然后在你的activity或fragment中像这样调用这个函数
lifecycleScope.launch {
lifecycle.repeatOnLifecycle(Lifecycle.State.STARTED){
viewModel.countDownTimer().collect{time->
//and update UI
//and for the finish section you can just use this
this.cancel()
}
}
}
现在在应用程序生命周期的暂停阶段会出现崩溃，你总是有最新的时间
如CountDownTimer的文档所示:
new CountDownTimer(30000, 1000) { onTick(long milliseconds untilfinished) { mTextField。setText("seconds remaining: " + msuntilfinished / 1000); //逻辑来设置EditText可以在这里 ｝ onFinish() { mTextField.setText(“完成了!”); ｝ } .start ();
只需复制粘贴以下代码........
MainActivity
包com.example.countdowntimer;
import java.util.concurrent.TimeUnit;
import android.app.Activity;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.widget.TextView;
public class MainActivity extends Activity {
TextView text1;
private static final String FORMAT = "%02d:%02d:%02d";
int seconds , minutes;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
text1=(TextView)findViewById(R.id.textView1);
new CountDownTimer(16069000, 1000) { // adjust the milli seconds here
public void onTick(long millisUntilFinished) {
text1.setText(""+String.format(FORMAT,
TimeUnit.MILLISECONDS.toHours(millisUntilFinished),
TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished) - TimeUnit.HOURS.toMinutes(
TimeUnit.MILLISECONDS.toHours(millisUntilFinished)),
TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) - TimeUnit.MINUTES.toSeconds(
TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished))));
}
public void onFinish() {
text1.setText("done!");
}
}.start();
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="34dp"
android:layout_marginTop="58dp"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceMedium" />
</RelativeLayout>
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>
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