Develop Reference

How to use the chronometer as a countdown timer in Android

I have defined a chronometer;
protected Chronometer chrono;
protected int baseTime;
protected int stopTime;
protected long elapsedTime;
My program asks questions to the user and i want to set a timer based on the user's input. I want a timer which starts at 10 to 0. How can i do that?
Also, I want to show the remaining time on the screen.

Use CountDownTImer instead,
new CountDownTimer(10000, 1000) { //Sets 10 second remaining
public void onTick(long millisUntilFinished) {
mTextView.setText("seconds remaining: " + millisUntilFinished / 1000);
}
public void onFinish() {
mTextView.setText("done!");
}
}.start();
Note : It's not possible to start Chronometer reversely because the Chronometer widget only counts up.
Edit: From API level 24, it is possible to perform count down using chronometer via help of Chronometer#setCountDown(true) method.

Create multiple countdowns in android

I am new to android and i am trying to implement a simple timer.For example i have one button and every time i click this button, a dialog shows up and i can set the time.
This time should then be displayed on the same activity, where the button is.
I am fairly new to android and i have only a button on my main activity.
My Questions now : How can i dynamicly add "countdowns" to my main_activity.Lets say maximum is 3.Is there something like a countdown class already or does TimePicker this for me ?

Below code runs a timer for 30 seconds. If you want the user to choose time, you can use an EditText to get the time from user and put it instead of 30000 in below code.
final CountDownTimer timer;
timer = new CountDownTimer(30000, 1000) {
public void onTick(long millisUntilFinished) {
timerText.setText("seconds remaining: " + String.valueOf(millisUntilFinished / 1000));
}
public void onFinish() {
timerText.setText("done!");
}
};

Timer label button click android

In my UI I have a button and a label.
On the button click I want to start a new thread which would update the label text to display the timer information (like 00:00 seconds).
This should be updated every second.
Could someone give a simple solution to this problem please?

Assuming that the information is in the form of a textView (called tv), you would use a countdowntimer:
new CountDownTimer(30000, 1) {
public void onTick(long millisUntilFinished) {
mTextField.setText(/* Whatever you want for each millisecond */);
}
public void onFinish() {
mTextField.setText("00:00");
}
}.start();
the second parameter in the CountDownTimer constructor is the intervals for which onTick, so for this timer, onTick will be called every millisecond.
Any questions?

Pause CountDown timer Android

I'm making a game for android which has a countdown. The countdown works perfectly, but the problem is that when I pause the game (I stop painting the surfaceview), the countdown continues on.
new CountDownTimer(60000, 1000) {
public void onTick(long millisUntilFinished) {
timer = String.valueOf(millisUntilFinished / 1000);
invalidate();
}
public void onFinish() {
}
}.start();
How can I pause the countdown?

You can do so by making a variable timer
static int timer = 60000;
Paas this as an argument:
CountdownTimer ct = new CountdownTimer(timer,1000){
Update your timer variable every time the countdown ticks.
Timer = timer-1000;
.
.
}
Now whenever you want to pause your timer
ct.cancel();
And start it whenever you want by calling
ct.start;

I'd like to make a countdown timer do a continuous loop in android - need opinions on how to do it

Is there a way to continuously loop through a countdown timer? I have a basic timer of going though 60 seconds, then updating a text field and it's working, but I want to add the functionality: when it's counted down, to automatically restart again until the user cancels it? Maybe run it through a thread? Not sure how to handle it. Here is what I have, and again, this code works, but I can only stop and start the countdown timer, not do a continuous loop:
cdt = new CountDownTimer(60000,1000) {
public void onTick(long millisUntilFinished) {
tvTimer.setText("remaining : " + millisUntilFinished/1000 + " secs");
}
public void onFinish() {
tvTimer.setText("");
bell.start();
}
};
/***************On Click/Touch Listeners*******************/
btnNext.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
tvTimer.setText("");
btnStart.setText("Start Timer");
SetImageView2(myDbHelper);
cdt.cancel();
}
});
btnStart.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (!TimerTicking){
cdt.start();
btnStart.setText("Stop Timer");
}
else {
tvTimer.setText("");
cdt.cancel();
btnStart.setText("Start Timer");
}
}
});

One very basic way to loop a CountDownTimer is to call start() in onFinished().
public void onFinish() {
...
start(); // Start this timer over
}
(Make sure you cancel your CountDownTimer in onPause() when you do this otherwise the timer might leak and keep firing in the background... Oops.)
However CountDownTimers has fundamental flaws (in my opinion): it often skips the last call to onTick() and it gains a few milliseconds each time onTick() is called... :( I re-wrote CountDownTimer in a previous question to be more accurate and call every tick.

The first value to the CountDownTimer() constructor, the total time to run, is a long and can hold a value approaching 300 million years. That ought to be long enough for most mobile applications. :-)
So just call it with cdt = new CountDownTimer(Long.MAX_VALUE, 1000) for a one second loop that will run continously.