如何在Android中制作倒数计时器？
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时间：2020-08-20 02:16:05 来源:igfitidea点击:
How to make a countdown timer in Android?
提问by Sabbir Ahmed
I have two EditTexts in XML. In one EditText, the user can put a number as minutes and in another EditText, a number as seconds. After clicking the finish button, the seconds EditText should start to countdown and update its text every second.
我有两个 XML 格式的 EditText。在一个 EditText 中，用户可以将一个数字作为分钟，而在另一个 EditText 中，一个数字作为秒。单击完成按钮后，秒 EditText 应该开始倒计时并每秒更新其文本。
Additionally, how can I keep it updating until it gets to zero minutes and zero seconds?
此外，如何保持更新直到它达到零分零秒？
回答by Shankar Agarwal
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();
Refer to this link.
请参阅此链接。
回答by shanraisshan
if you use the below code (as mentioned in accepted answer),
如果您使用以下代码（如已接受的答案中所述），
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();
It will result in memory leak of the instance of the activity where you use this code, if you don't carefully clean up the references.
如果您不仔细清理引用，它将导致您使用此代码的活动实例的内存泄漏。
use the following code
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();
}
You need to call cTtimer.cancel()whenever the onDestroy()/onDestroyView()in the owning Activity/Fragment is called.
每当调用拥有的 Activity/Fragment 中的onDestroy()/onDestroyView ()时，您都需要调用cTtimer.cancel()。
回答by Sanjay Mangaroliya
MainActivity.java
主活动.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 = "2020-12-31 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
活动_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>
回答by gAuRaV jAiN
just copy paste the following code........
只需复制粘贴以下代码......
MainActivity
主要活动
package com.example.countdowntimer;
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
活动_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>
回答by Prashant Maheshwari Andro
Just Call below function by passing seconds and textview object
只需通过传递秒数和 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();
}
回答by tej shah
Revers CountDown timer with hours minutes and seconds
以小时、分钟和秒反转倒计时计时器
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 hours = seconds / (60 * 60);
int tempMint = (seconds - (hours * 60 * 60));
int minutes = tempMint / 60;
seconds = tempMint - (minutes * 60);
tv.setText("TIME : " + String.format("%02d", hours)
+ ":" + String.format("%02d", minutes)
+ ":" + String.format("%02d", seconds));
}
public void onFinish() {
tv.setText("Completed");
}
}.start();
}
回答by Daniel Shterenberg
Using Kotlin:
使用科特林：
var timer = object: CountDownTimer(30000, 1000) {
override fun onTick(millisUntilFinished: Long) {
tvTimer.setText("seconds remaining: " + millisUntilFinished / 1000)
}
override fun onFinish() {
tvTimer.setText("done!")
}
}
timer.start()
回答by Sai
The Interface way.
接口方式。
import android.os.CountDownTimer;
/**
* Created by saikiran on 07-03-2016.
*/
public class CountDownTimerCustom extends CountDownTimer {
private TimeTickListener mTickListener;
private TimeFinishListener mFinishListener;
private long millisUntilFinished;
public CountDownTimerCustom(long millisInFuture, long countDownInterval) {
super(millisInFuture, countDownInterval);
}
public void updateTickAndFinishListener(TimeTickListener tickListener) {
mTickListener = tickListener;
}
public void updateFinishListner(TimeFinishListener listener) {
mFinishListener = listener;
}
public long getCurrentMs() {
return millisUntilFinished;
}
public int getCurrentSec() {
return (int) millisUntilFinished / 1000;
}
@Override
public void onTick(long millisUntilFinished) {
this.millisUntilFinished = millisUntilFinished;
if (mTickListener != null)
mTickListener.onTick(millisUntilFinished);
}
@Override
public void onFinish() {
if (mTickListener != null)
mTickListener.onFinished();
mFinishListener.onFinished();
}
public interface TimeTickListener {
void onTick(long mMillisUntilFinished);
void onFinished();
}
public interface TimeFinishListener {
void onFinished();
}
}
回答by V.Y.
Try this way:
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();
}
回答by Paramatma Sharan
public class Scan extends AppCompatActivity {
int minute;
long min;
TextView tv_timer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_scan2);
tv_timer=findViewById(R.id.tv_timer);
minute=Integer.parseInt("Your time in string form like 10");
min= minute*60*1000;
counter(min);
}
private void counter(long min) {
CountDownTimer timer = new CountDownTimer(min, 1000) {
public void onTick(long millisUntilFinished) {
int seconds = (int) (millisUntilFinished / 1000) % 60;
int minutes = (int) ((millisUntilFinished / (1000 * 60)) % 60);
int hours = (int) ((millisUntilFinished / (1000 * 60 * 60)) % 24);
tv_timer.setText(String.format("%d:%d:%d", hours, minutes, seconds));
}
public void onFinish() {
Toast.makeText(getApplicationContext(), "Your time has been completed",
Toast.LENGTH_LONG).show();
}
};
timer.start();
}
}
}
