i an developing a simple task in which i want to make a countdown timer running still in background when my app is stopped and closed. and all this work should b done without using android services...
Here is the code what i am using. in this code time keeps running in background when i Minimizes my app not close... but when i close my app then it starts from beginning which is not suitable for me... what i want that the time keeps on running until i close my app.
public class MainActivity extends AppCompatActivity {
private static long START_TIME_IN_MILLIS = 90000;
private TextView mTextViewCountDown;
private Button mButtonStartPause;
private Button mButtonReset;
private CountDownTimer mCountDownTimer;
private boolean mTimerRunning;
private long mTimeLeftInMillis;
private long mEndTime;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTextViewCountDown = findViewById(R.id.text_view_countdown);
mButtonStartPause = findViewById(R.id.button_start_pause);
mButtonReset = findViewById(R.id.button_reset);
startTimer();
}
private void startTimer() {
mEndTime = System.currentTimeMillis() + START_TIME_IN_MILLIS;
mCountDownTimer = new CountDownTimer(START_TIME_IN_MILLIS, 1000) {
#Override
public void onTick(long millisUntilFinished) {
START_TIME_IN_MILLIS = millisUntilFinished;
updateCountDownText();
}
#Override
public void onFinish() {
mTimerRunning = false;
}
}.start();
mTimerRunning = true;
}
private void updateCountDownText() {
int minutes = (int) (START_TIME_IN_MILLIS / 1000) / 60;
int seconds = (int) (START_TIME_IN_MILLIS / 1000) % 60;
String timeLeftFormatted = String.format(Locale.getDefault(), "%02d:%02d", minutes, seconds);
mTextViewCountDown.setText(timeLeftFormatted);
}
#Override
protected void onStop() {
super.onStop();
SharedPreferences prefs = getSharedPreferences("prefs", MODE_PRIVATE);
SharedPreferences.Editor editor = prefs.edit();
editor.putLong("millisLeft", START_TIME_IN_MILLIS);
editor.putBoolean("timerRunning", mTimerRunning);
editor.putLong("endTime", mEndTime);
editor.apply();
if (mCountDownTimer != null) {
mCountDownTimer.cancel();
}
}
#Override
protected void onStart() {
super.onStart();
SharedPreferences prefs = getSharedPreferences("prefs", MODE_PRIVATE);
START_TIME_IN_MILLIS = prefs.getLong("millisLeft", START_TIME_IN_MILLIS);
mTimerRunning = prefs.getBoolean("timerRunning", false);
updateCountDownText();
mEndTime = prefs.getLong("endTime", mEndTime);
START_TIME_IN_MILLIS = mEndTime - System.currentTimeMillis();
Comm.endTime = (int) START_TIME_IN_MILLIS;
startTimer();
}
}
I'm trying to loop my countdown timer for a specific number of times, but I'm not sure where I should add my for loop... Currently trying to do an interval timer function (I know there's a way to do it via Handler, but I'm still a beginner and got kind of confused on how I shoul use the handler)
I've tried adding it at '.start' and the StartTimer function but the countdown time still stays at 0. Would be great if any assistance is given as I'm still a beginner.. Thanks!
package com.example.bushykai.myapplication;
import android.os.CountDownTimer;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class Timer extends AppCompatActivity {
private static final long START_TIME_IN_MILLIS=10000;
private int sets = 3;
private TextView textViewCountdown;
private Button buttonStartPause;
private Button buttonReset;
private CountDownTimer countDownTimer;
private boolean timerRunning;
private long timeLeftInMillis = START_TIME_IN_MILLIS;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_timer);
textViewCountdown = findViewById(R.id.countdownTimer);
buttonStartPause = findViewById(R.id.startPause);
buttonReset= findViewById(R.id.reset);
buttonStartPause.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (timerRunning) {
pauseTimer();
}
else {
startTimer();
}
}
});
buttonReset.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
resetTimer();
}
});
updateCountDownText();
}
private void pauseTimer() {
countDownTimer.cancel();
timerRunning = false;
buttonStartPause.setText("Start");
buttonReset.setVisibility(View.VISIBLE);
}
private void startTimer() {
countDownTimer = new CountDownTimer(timeLeftInMillis, 1000) {
#Override
public void onTick(long millisUntilFinished) {
timeLeftInMillis = millisUntilFinished;
updateCountDownText();
}
#Override
public void onFinish() {
timerRunning = false;
buttonStartPause.setText("Start");
buttonStartPause.setVisibility(View.INVISIBLE);
buttonReset.setVisibility(View.VISIBLE);
}
}.start();
timerRunning = true;
buttonStartPause.setText("Pause");
buttonReset.setVisibility((View.INVISIBLE));
}
private void resetTimer() {
timeLeftInMillis = START_TIME_IN_MILLIS;
updateCountDownText();
buttonReset.setVisibility(View.INVISIBLE);
buttonStartPause.setVisibility(View.VISIBLE);
}
private void updateCountDownText() {
int minutes = (int) (timeLeftInMillis / 1000 ) / 60;
int seconds = (int) (timeLeftInMillis / 1000 ) % 60;
String timeLeftFormatted = String.format("%02d:%02d", minutes, seconds);
textViewCountdown.setText(timeLeftFormatted);
}
}
You have to add a Runnable Handler to your class try code below and modify with your Countdown Timer
public Handler timerHandler = new Handler();
public Runnable timerRunnable = new Runnable() {
#Override
public void run() {
//show alert or DO Whatever
}
};
public void timerStart() {
timerStop();
timerHandler.postDelayed(timerRunnable, Constants.TIMER_TIME_OUT);
}
public void timerStop() {
timerHandler.removeCallbacks(timerRunnable);
}
I want to build a 5 second timer that counts down to 0 in 1 second intervils and then resets to the initial value of 5 seconds. The timer needs to run continously. After looking at this thread,
Android - loop part of the code every 5 seconds
I used the CountDownTimer Class and called the start() method within the onFinish() method so that when the timer finished, it would reset to 5. It does run on a continous loop, however I notice that after the first loop, it either countsdown as 4-3-2-1-0 or 5-3-2-1-0.
Can somebody explain to me why this happens?
private long START_TIME_IN_MILLIS = 5000;
//set up our variables
private CountDownTimer timer;
private TextView textView;
private Button starttimer;
private long mTimeLeftInMillis = START_TIME_IN_MILLIS;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView = findViewById(R.id.text_view_countdown);
starttimer = findViewById(R.id.button_start_pause);
//set onclik listener when touch imput button
starttimer.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
beginTime();
}
});
}
//creating my own method
private void beginTime() {
timer = new CountDownTimer(mTimeLeftInMillis, 1000) {
#Override
public void onTick(long millisUntilFinished) {
mTimeLeftInMillis = millisUntilFinished;
updateCountDownText();
}
#Override
public void onFinish() {
start();
}
}.start();
}
private void updateCountDownText(){
int minutes= (int) (mTimeLeftInMillis / 1000)/ 60;
int seconds= (int) (mTimeLeftInMillis / 1000) % 60;
String timeLeftFormatted = String.format(Locale.getDefault(),"%02d:%02d", minutes, seconds);
textView.setText(timeLeftFormatted);
}
}
Try this
#Override
public void onFinish() {
mTimeLeftInMillis = START_TIME_IN_MILLIS;
}
I dont know how I add extra time to a timer that is running.
Evertime I press a button I want to add 1 second.
So my question is, how do I do this?
Here is my timer(code):
private void TimerGame(){
new CountDownTimer(15000, 1000) {
TextView mTextField = (TextView) findViewById(R.id.timeTv);
Button start = (Button)findViewById(R.id.startGameBtn);
TextView go = (TextView)findViewById(R.id.tvGo);
public void onTick(long millisUntilFinished) {
mTextField.setText("" +millisUntilFinished / 1000);
}
public void onFinish() {
mTextField.setText("15");
start.setVisibility(View.VISIBLE);
go.setVisibility(View.INVISIBLE);
reset();
}
}.start();
}
As far as I looked into CountDownTimer there is no method to what you want.
However, I made a small example of what you can do. I haven't tested it but it shouldn't be too hard to put it on track.
private Handler countdownHandler = new Handler();
private Runnable updateCountdownTask = new UpdateCountdownTaskRunnable();
private int timeSeconds;
private class UpdateCountdownTaskRunnable implements Runnable {
#Override
public void run() {
timeSeconds -= 1;
if (timeSeconds == 0) {
stopWhatever();
} else {
updateWhatever();
countdownHandler.postDelayed(this, 1000);
}
}
}
private void start() {
timeSeconds = 20;//seconds
countdownHandler.postDelayed(updateCountdownTask, 0);
}
private void stop(){};
private void update(){};
private void addTime(int time){ timeSeconds += time; };
I want to do countdown timer with pause and restart.Now i am displaying countdown timer By implenting ontick() and onfinish().please help me out.HEre is th code for countdown timer
final CountDownTimer Counter1 = new CountDownTimer(timervalue1 , 1000)
{
public void onTick(long millisUntilFinished)
{
System.out.println("onTick method!"(String.valueOf(millisUntilFinished/1000)));long s1=millisUntilFinished;
}
public void onFinish()
{
System.out.println("Finished!");
}
}
in onTick method..save the milliseconds left
long s1=millisUntilFinished;
when you want to pause the timer use..
Counter.cancel();
when you want to resume create a new countdowntimer with left milliseconds..
timervalue=s1
counter= new Counter1();
counter.start();
See this link
I would add something to the onTick handler to save the progress of the timer in your class (number of milliseconds left).
In the onPause() method for the activity call cancel() on the timer.
In the onResume() method for the activity create a new timer with the saved number of milliseconds left.
Refer the below links
LINK
LINK
My first answer on stackOverFlow, hope it should help :) ...
This is how I solved the problem, control timer from Fragment, Bottomsheet, Service, Dialog as per your requirement, keep a static boolean variable to control.
declare in your Activity:
long presetTime, runningTime;
Handler mHandler =new Handler();
Runnable countDownRunnable;
Toast toastObj;
public static boolean shouldTimerRun = true;
TextView counterTv;
In onCreate:
presetTime =60000L;
runningTime= presetTime;
//setting up Timer
countDownRunnable=new Runnable() {
#Override
public void run() {
if (shouldTimerRun) //if false, it runs but skips counting
{
counterTv.setText(simplifyTimeInMillis(runningTime));
if (runningTime==0) {
deployToast("Task Completed"); //show toast on task completion
}
runningTime -= 1000;
presetTime = runningTime; //to resume the timer from last position
}
mHandler.postDelayed(countDownRunnable,1000); //simulating on-tick
}
};
mHandler.post(countDownRunnable); // Start our CountdownTimer
Now, whenever you want to pause the timer change the value of shouldTimerRun false and to resume make it true.
#Override
public void onResume() {
super.onResume();
shouldTimerRun=true;
}
#Override
public void onPause() {
super.onPause();
shouldTimerRun=false;
deployToast("Timer is paused !!");
}
Helping methods: (can be skipped)
public static String simplifyTimeInMillis(long time) {
String result="";
long difference = time;
long secondsInMilli = 1000;
long minutesInMilli = secondsInMilli * 60;
long hoursInMilli = minutesInMilli * 60;
if (difference<1000){
return "0";
}
if (difference>=3600000) {
result = result + String.valueOf(difference / hoursInMilli) + "hr ";
difference = difference % hoursInMilli;
}
if (difference>=60000) {
result = result + String.valueOf(difference / minutesInMilli) + "m ";
difference = difference % minutesInMilli;
}
if (difference>=1000){
result = result + String.valueOf(difference / secondsInMilli) + "s";
}
return result;
}
public void deployToast(String msg){
if (toastObj!=null)
toastObj.cancel();
toastObj = Toast.makeText(mContext,msg,Toast.LENGTH_SHORT);
toastObj.show();
}
I'm using two private vars in this case:
private long startPauseTime;
private long pauseTime = 0L;
public void pause() {
startPauseTime = System.currentTimeMillis();
}
public void resumen(){
pauseTime += System.currentTimeMillis() - startPauseTime;
}
I am afraid that it is not possible to pause or stop CountDownTimer and pausing or stopping in onTick has no effect whatsoever user TimerTask instead.
Set up the TimerTask
class UpdateTimeTask extends TimerTask {
public void run() {
long millis = System.currentTimeMillis() - startTime;
int seconds = (int) (millis / 1000);
int minutes = seconds / 60;
seconds = seconds % 60;
timeLabel.setText(String.format("%d:%02d", minutes, seconds));
}
}
if(startTime == 0L) {
startTime = evt.getWhen();
timer = new Timer();
timer.schedule(new UpdateTimeTask(), 100, 200);
}
You can add event listener's like this..
private Handler mHandler = new Handler();
...
OnClickListener mStartListener = new OnClickListener() {
public void onClick(View v) {
if (mStartTime == 0L) {
mStartTime = System.currentTimeMillis();
mHandler.removeCallbacks(mUpdateTimeTask);
mHandler.postDelayed(mUpdateTimeTask, 100);
}
}
};
OnClickListener mStopListener = new OnClickListener() {
public void onClick(View v) {
mHandler.removeCallbacks(mUpdateTimeTask);
}
};
For more refer to Android Documentation.
//This timer will show min:sec format and can be paused and resumed
public class YourClass extends Activity{
TextView timer;
CountDownTimer ct;
long c = 150000; // 2min:30sec Timer
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.YourXmlLayout);
timer = (TextView)findViewById(R.id.Yourtimer)
startTimer(); // it will start the timer
}
public void startTimer(){
ct = new CountDownTimer(c,1000) {
#Override
public void onTick(long millisUntilFinished) {
// Code to show the timer in min:sec form
// Here timer is a TextView so
timer.setText(""+String.format("%02d:%02d",millisUntilFinished/60000,(millisUntilFinished/1000)%60));
c = millisUntilFinished; // it will store millisLeft
}
#Override
public void onFinish() {
//your code here
}
};
ct.start();
}
/*===========================================================
*after creating this you can pause this by typing ct.cancel()
*and resume by typing startTimer()*/
public class MainActivity extends AppCompatActivity {
TextView textView;
CountDownTimer ctimer;
boolean runCountDown;
private long leftTime;
private static final long MILL_IN_FUTURE = 6000;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView = findViewById(R.id.text_view);
textView.setText("Click to start");
textView.setOnClickListener(this::clickStartAndPauseAndResume);
leftTime = MILL_IN_FUTURE;
}
public void clickStartAndPauseAndResume(View view) {
if (!runCountDown) {
long time = (leftTime == 0 || leftTime == MILL_IN_FUTURE) ? MILL_IN_FUTURE : leftTime;
ctimer = new CountDownTimer(time, 1) {
#Override
public void onTick(long l) {
leftTime = l;
textView.setText(l + "ms");
}
#Override
public void onFinish() {
textView.setText("Done");
leftTime = 0;
runCountDown = false;
textView.postDelayed(new Runnable() {
#Override
public void run() {
textView.setText("Click to start");
}
}, 1000);
}
}.start();
runCountDown = true;
} else {
ctimer.cancel();
textView.setText(textView.getText() + "\n Click to resume");
runCountDown = false;
}
}
}
A nice and simple way to create a Pause/Resume for your CountDownTimer is to create a separate method for your timer start, pause and resume as follows:
public void timerStart(long timeLengthMilli) {
timer = new CountDownTimer(timeLengthMilli, 1000) {
#Override
public void onTick(long milliTillFinish) {
milliLeft=milliTillFinish;
min = (milliTillFinish/(1000*60));
sec = ((milliTillFinish/1000)-min*60);
clock.setText(Long.toString(min)+":"+Long.toString(sec));
Log.i("Tick", "Tock");
}
The timerStart has a long parameter as it will be reused by the resume() method below. Remember to store your milliTillFinished (above as milliLeft) so that you may send it through in your resume() method. Pause and resume methods below respectively:
public void timerPause() {
timer.cancel();
}
private void timerResume() {
Log.i("min", Long.toString(min));
Log.i("Sec", Long.toString(sec));
timerStart(milliLeft);
}
Here is the code for the button FYI:
startPause.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if(startPause.getText().equals("Start")){
Log.i("Started", startPause.getText().toString());
startPause.setText("Pause");
timerStart(15*1000);
} else if (startPause.getText().equals("Pause")){
Log.i("Paused", startPause.getText().toString());
startPause.setText("Resume");
timerPause();
} else if (startPause.getText().equals("Resume")){
startPause.setText("Pause");
timerResume();
}