I'm currently using a runnable and handler to have a timer which updates a textview every second.
public class TimerFragment extends Fragment {
TextView tvTimer;
long startTime = 0;
Handler timerHandler = new Handler();
Runnable timerRunnable = new Runnable() {
#Override
public void run() {
long millis = System.currentTimeMillis() - startTime;
int seconds = (int)(millis/1000);
int minutes = seconds / 60;
seconds = seconds % 60;
tvTimer.setText(String.format("%d:%02d", minutes, seconds));
timerHandler.postDelayed(this,500);
}
};
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.frag_timer, null);
tvTimer = (TextView)view.findViewById(R.id.tvTimer);
Button btn = (Button)view.findViewById(R.id.btn1);
btn.setText("Start");
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Button b = (Button) v;
if (b.getText().equals("Stop")){
timerHandler.removeCallbacks(timerRunnable);
b.setText("Start Monitoring");
}
else {
startTime = System.currentTimeMillis();
timerHandler.postDelayed(timerRunnable, 0);
b.setText("Stop");
Toast.makeText(getActivity(),"Monitoring started.",Toast.LENGTH_SHORT).show();
}
}
});
return view;
}
}
How do i get the value of the timer? Like for example, showing a toast when the text becomes "0:15". I want to be able to get the value so I can use it. The function I have in mind is having the user set a time and have a toast or notification pop up when the timer passes through that time (like 15 or 30 seconds). But right now what I want to know is how to get the value of the timer. Thanks!
You should use a CountDownTimer to set a countdown based on interval set by you and it will stop when the time has come in future
CountDownTimer(long millisInFuture, long countDownInterval)
// Example : I've set countdown for 30 seconds
CountDownTimer countDownTimer = new CountDownTimer(30000, 1000) {
public void onTick(long millisUntilFinished) {
text_view.setText(millisUntilFinished / 1000 + " " + "Sec");
}
public void onFinish() {
// implement your code customization here after interval is over
text_view.setText("time over!");
}
}.start();
For more insights refer the Android Developer reference for CountDownTimer
Related
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 am learning android. I made this stopwatch app work from my reference book.It only shows Hour:minutes:seconds but I want to add milliseconds right to the seconds.how do I do that.
code::-
public class StopWatchActivity extends AppCompatActivity {
int seconds;
boolean running;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_stop_watch);
runTimer();
}
public void startTimer(View view){
running = true;
}
public void stopTimer(View view){
running = false;
}
public void resetTimer(View view){
running = true;
seconds = 0;
}
public void runTimer(){
final TextView textView = (TextView) findViewById(R.id.timer);
final Handler handler = new Handler();
handler.post(new Runnable() {
#Override
public void run() {
int hours = seconds / 3600;
int minutes = (seconds % 3600) / 60;
int sec = seconds % 60;
String time = String.format("%d:%02d:%02d", hours,
minutes,sec);
textView.setText(time);
if(running) {
seconds++;
}
handler.postDelayed(this, 1000);
}
});
}
}
The first step would be to change the field seconds to milliSeconds because you want to keep track of that TimeUnit.
When restarting your handler with handler.postDelayed(this, 1000); define 1 millisecond as delay instead of 1000 (= 1 Second) like this handler.postDelayed(this, 1); then you just need to adjust your calculations and you are done :-)
An easier solution would be:
Instead of saving the elapsed seconds in your activity, save the time that the timer started (e.g. startTime)
Then, in your handler's runnable, get the current time and subtract the start time to find the elapsed time.
Pseudocode:
long startTimeNanos
public void runTimer() {
startTime = new Date()
final Handler handler = new Handler();
handler.post(new Runnable() {
#Override
public void run() {
long currentTime = System.nanoTime()
long elapsedNanos = currentTime - startTimeNanos
// calculate seconds and millis
// and set the textview text
handler.postDelayed(this, 1000);
}
});
}
This way, you can change the time that the handler fires and it won't affect anything else.
i've created a small app of memory game. in that app i have created a timer that show the time that take the user to finish the game. my problem is that the timer freeze after i go to another page (like home screen) and back to the game- the time remain at the same time it was stopped.....(i khnow it related somehow to onRestarte() method but dont know what to do..) i want that the timer will continue at the same time it has been stopped. (like if the user have an incall in the middle of the game and then want to continue).
package com.example.kineret.memorygame;
public class Game4x4Activity extends AppCompatActivity implements View.OnClickListener{
TextView timerTextView;
long startTime = 0;
Handler timerHandler = new Handler();
Runnable timerRunnable = new Runnable() {
#Override
public void run() {
long millis = System.currentTimeMillis() - startTime;
int seconds = (int) (millis / 1000);
int minutes = seconds / 60;
seconds = seconds % 60;
timerTextView.setText(String.format("%d:%02d", minutes, seconds));
timerHandler.postDelayed(this, 500);
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game4x4);
timerTextView = (TextView) findViewById(R.id.timerTextView4x4);
}
#Override
public void onPause() {
super.onPause();
timerHandler.removeCallbacks(timerRunnable);
}
#Override
public void onClick(View view) {
if(newGame) {
startTime = System.currentTimeMillis();
timerHandler.postDelayed(timerRunnable, 0);
newGame = false;
}
// rest of my code...
}
i have edited your code. plz try this
public class Game4x4Activity extends AppCompatActivity implements View.OnClickListener{
// make a new variable
static long elapsedTime = 0;
TextView timerTextView;
long startTime = 0;
Handler timerHandler = new Handler();
Runnable timerRunnable = new Runnable() {
#Override
public void run() {
// change here
long millis = (System.currentTimeMillis() - startTime) + elapsedTime;
int seconds = (int) (millis / 1000);
int minutes = seconds / 60;
seconds = seconds % 60;
timerTextView.setText(String.format("%d:%02d", minutes, seconds));
timerHandler.postDelayed(this, 500);
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game4x4);
timerTextView = (TextView) findViewById(R.id.timerTextView4x4);
}
#Override
public void onPause() {
// change here
elapsedTime = elapsedTime + (System.currentTimeMillis() - startTime);
timerHandler.removeCallbacks(timerRunnable);
super.onPause();
}
#Override
public void onResume() {
super.onResume();
// change here
if(!newGame) {
startTime = System.currentTimeMillis();
timerHandler.postDelayed(timerRunnable, 0);
}
}
If the user gets a phone call your app will call onPause then if they finish their phone call and play your game your activity will get onResume called.
in onPause save the system time, in onResume get the latest system time. Take these away from each other (in onResume) and you will have the time that the user was not in your app, you can then add this to your timer before you restart it.
You may also have to persist this time with onSaveInstanceState at other points.
I am trying to show the total image taking time(timer) to the user in my android application.
What I did:
I am starting the Handler when the fragment starts. (i.e) I have started the handler in my "onCreateView" method as like below.
MainFragment:
private long startTime = 0L;
private long timeInMillies = 0L;
private long timeSwap = 0L;
private long finalTime = 0L;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.capture,
container, false);
TextView textview = (TextView)rootView.findViewById(R.id.timer);
startTime = SystemClock.uptimeMillis();
Handler myHandler = new Handler();
Runnable updateTimer = new Runnable() {
public void run() {
timeInMillies = SystemClock.uptimeMillis() - startTime;
finalTime = timeSwap + timeInMillies;
int seconds = (int) (finalTime / 1000);
seconds = seconds % 60;
int milliseconds = (int) (finalTime % 1000);
milliseconds = milliseconds % 60 ;
textview.setText(String.format("%02d", seconds) + ":" + String.format("%02d", milliseconds) + "s");
myHandler.postDelayed(this, 0);
}
};
myHandler.postDelayed(updateTimer, 0);
.
.
.
return rootView;
}
What I want:
The handler is running well and timer runs without delaying like(00.00, 00.01, 00.02, 00.03, 00.04, ......, 10.32) until I start to call the "camera.takePicture(null, null, pictureCallback);". Once I call the "camera.takePicture" the timer shows the time with some sec delay(00.00, 00.01, 00.02, 00.03, delay, 02.30, 02.31, 02.32, delay, 04.03, 04.04, ......)
#Override
public void onResume() {
super.onResume();
.
.
.
camera.takePicture(null, null, pictureCallback);
}
What would be the problem? Did anyone face this issue? How do I fix this issue?
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();
}