Develop Reference

Running backgound thread every X seconds (Android Studio)

I have a code that plays 5 sounds with 1 second delay between the sounds and I want this part of code to be executed every 5 seconds (so it will run in a row so far as a boolean variable is true, and when it becomes false the tread run stopped - I have a button to both start and stop this executions). Everything works perfectly, but the issue is that I can't get rid of the 5 seconds delay in the first time I click the button, so when I first click, the sounds beggins only after 5 seconds. How can I make it start right away and only after the first time start taking the delays?
Here is the button onClick code:
public void clickHandlerStartTempo(final View view) {
if (!tempoOn) {
Toast toast = Toast.makeText(getApplicationContext(), "Start Tempo!", Toast
.LENGTH_SHORT);
toast.show();
tempoOn = true;
final Handler handler = new Handler();
final int delay = 5000; //milliseconds
handler.postDelayed(new Runnable() {
public void run() {
if (tempoOn) {
runCode(view);
handler.postDelayed(this, delay);
}
}
}, delay);
} else {
Toast toast = Toast.makeText(getApplicationContext(), "Stop Tempo!", Toast
.LENGTH_SHORT);
toast.show();
tempoOn = false;
}
}
And here is the runCode method:
public void runCode(View view) {
Runnable runnable = new Runnable() {
#Override
public void run() {
playSound(0);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
for (int i = 0; i < 4; i++) {
if (tempoOn) {
playSound(1);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
} else {
return;
}
}
}
};
Thread thread = new Thread(runnable);
Log.i(TAG, "runCode: Thread id = " + thread.getId());
thread.start();
}
I'm new to android development and any help would be very much appreciated.
Thanks.

First you need to playsound without thread after that you will execute your reaming 5 second logic stop thread after 4 count.
public void onStartPress(){
playSound();
someMethod();
}
public void someMethod(){
Handler uiHandler = new Handler(Looper.getMainLooper());
uiHandler.postDelayed(new Runnable() {
#Override
public void run() {
playSound();
someMethod();
}
},1000);
}

Don't use actual Threads unless you really want to do something off the Ui thread. Most of the time you do want to keep things on the Ui thread.
For simple repeating tasks, you can easily repurpose the CountDownTimer class. Often with an (almost) infinite run time or Long.MAX_VALUE (292 million years). The fist onTick happens immediately after starting.
private CountDownTimer mTimer;
private void start() {
if (mTimer == null) {
mTimer = new CountDownTimer(Long.MAX_VALUE, 5000) {
#Override
public void onTick(long millisUntilFinished) {
// start a beeping countdown
new CountDownTimer(5000, 1000) {
private int state = 1;
#Override
public void onTick(long millisUntilFinished) {
playSound(state);
state = state + 1 % 2;
}
#Override
public void onFinish() {
playSound(0);
}
}.start();
}
#Override
public void onFinish() { /* ignore, never happens */ }
};
mTimer.start();
}
}
private void stop() {
if (mTimer != null) {
mTimer.cancel();
mTimer = null;
}
}

Can't get coundown timer to work or display in my program

I'm a newer programmer and this is my first project but I'm having a bit of trouble in making a proper loop with three timers that are supposed to run one after the other. I managed to get the objects to hold the values they are supposed to within the loop but for some reason, the timer isn't displaying in the text field like it should.
startBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.i("mTimer:", String.valueOf(mTimer));
Log.i("mReps:", String.valueOf(mReps));
Log.i("Flexion:", String.valueOf(flexionTimer));
Log.i("Hold:", String.valueOf(holdTimer));
Log.i("Extension:", String.valueOf(extensionTimer));
for (int iter = 0; iter < mReps; iter++) {
Log.i("Loop:", String.valueOf(iter));
final Timer workingFlexionTimer = new Timer();
workingFlexionTimer.schedule(new TimerTask() {
int counter = ((int) flexionTimer / 1000);
#Override
public void run () {
runOnUiThread(new Runnable() {
#Override
public void run() {
mPhase.setText("Flexion");
mCountDownTimer.setText("" + String.format(String.valueOf(counter + 1)));
}
});
if (counter-- == 0) {
workingFlexionTimer.cancel();
}
}
}, 0, 1000);
final Timer workingHoldTimer = new Timer();
workingHoldTimer.schedule(new TimerTask() {
int counter = ((int) holdTimer / 1000);
#Override
public void run() {
runOnUiThread(new Runnable() {
#Override
public void run() {
mPhase.setText("Hold!!!");
mCountDownTimer.setText("" + String.format(String.valueOf(counter + 1)));
}
});
if (counter-- == 0) {
workingHoldTimer.cancel();
}
}
}, flexionTimer, 1000);
final Timer workingExtensionTimer = new Timer();
workingExtensionTimer.schedule(new TimerTask() {
int counter = ((int) extensionTimer / 1000);
#Override
public void run() {
runOnUiThread(new Runnable() {
#Override
public void run() {
mPhase.setText("Extension");
mCountDownTimer.setText("" + String.format(String.valueOf(counter + 1)));
}
});
if (counter-- == 0) {
workingExtensionTimer.cancel();
}
}
}, (flexionTimer + holdTimer), 1000);
}
I'm kind of at a loss at this point and any suggestion would be appreciated.

Use handler
private void Timer() {
handler = new Handler();
Run =new Runnable() {
#Override
public void run() { //Do something after 10 sec
Toast.makeText(getActivity(), "Timer called!",Toast.LENGTH_LONG).show();
Timer(); // Do again
}};
handler.postDelayed(Run , 10000); // 10 sec
}

UPDATE
For timers I always do:
final TextView textView = (TextView)findViewById(R.id.textView);
Timer timer = new Timer();
timer.schedule(new TimerTask() {
int counter = 10;
#Override
public void run() {
runOnUiThread(new Runnable() {
#Override
public void run() {
textView.setText(""+counter);
}
});
if (counter-- == 0){
timer.cancel();
}
}
}, 0, 1000);
timer.schedule(new TimerTask() {
int counter = 10;
#Override
public void run() {
runOnUiThread(new Runnable() {
#Override
public void run() {
textView.setText(""+counter);
}
});
if (counter-- == 0){
timer.cancel();
}
}
}, 10000, 1000);
timer.schedule(new TimerTask() {
int counter = 10;
#Override
public void run() {
runOnUiThread(new Runnable() {
#Override
public void run() {
textView.setText(""+counter);
}
});
if (counter-- == 0){
timer.cancel();
}
}
}, 20000, 1000);
For more info check this
In the link...
public void schedule(TimerTask task, long delay, long period)
The above code. Start the run() without delay.
long delay = 0;// in ms
long period = 1000;// in ms
So every 1000ms call the run() and counter--. When counter = 0 cancel.
If you want to run, the one after the other, put delay.
UPDATE
Now the first will run immediately, the second will wait 10000ms (10s) and will run, finaly the third will wait 20000ms (20s) and then run.

The first timer flexionCountDownTimer was started in a loop, which means it will be started more than one time if mReps is greater than 1. This might leads to 2nd run of flexionCountDownTimer before the 1st run finished. Is this your expected behavior?

How to implement two countdown timers alternatively in Android

I have implemented one counter and onFinish() of first counter,I started second counter but the first counter not able to finish.Text "Bye Guyz" remain for some time so how to finish the text.
Please help me.
Thanks in advance.!!!
Code :-
counter= new CountDownTimer(10000, 1000) {
public void onTick(long millisUntilFinished) {
if (count == 0) {
tv.setText("First counter");
tv2.setVisibility(View.VISIBLE);
tv2.setText("Hello Guyz");
}
}
public void onFinish() {
if(!flag) {
tv2.setText("Bye Guyz");
count = 0;
try {
counter.cancel();
}catch (Exception e){}
}
else if(flag) {
counter1 = new CountDownTimer(9000, 1000) {
public void onTick(long millisUntilFinished) {
flag = false;
tv.setText("Second counter");
tv2.setVisibility(View.VISIBLE);
tv2.setText("Hello Girls");
count = 0;
}
public void onFinish() {
tv2.setVisibility(View.VISIBLE);
tv2.setText("Bye Girls");
count = 0;
}
}.start();

Did you "debug" the code to be sure the code is arriving to counter1 = new CountDownTimer(9000, 1000)?
Are you sure when the first counter arrives to onFinish() the flag variable is true?
Why do you call counter.cancel() in onFinish() when obviously the counter is already over?
public void onFinish() {
if(!flag) {
tv2.setText("Bye Guyz");
count = 0;
try {
counter.cancel();
}catch (Exception e){}
}

If you say your tv2 displays "Bye Guyz" it means that your flag is set to false, so the "else if" part is not being executed. onFinish() is only executed once, so you need to make sure the flag is set for true to start the second counter.
Also you shouldn't cancel your counter in onFinish() because it's already finished.

Here is my alternative is as follows
Create the custom Counterextending Thread
class Counter extends Thread {
private long timeOne, timeTwo;
private OnCounterFinishedListener mCounterFinishedListener;
private Thread t;
Activity activity = null;
Counter(Context context){
t = new Thread(this);
activity = (Activity)context;
}
#Override
public void run() {
try {
sleep(timeOne);
activity.runOnUiThread(new Runnable() {
#Override
public void run() {
mCounterFinishedListener.firstCounterFinished();
}
});
sleep(timeTwo);
activity.runOnUiThread(new Runnable() {
#Override
public void run() {
mCounterFinishedListener.secondCounterFinished();
}
});
} catch (InterruptedException e) {
e.printStackTrace();
}
}
void setTimes(long timeOne, long timeTwo){
this.timeOne = timeOne;
this.timeTwo = timeTwo;
}
public void start(OnCounterFinishedListener listener){
mCounterFinishedListener = listener;
t.start();
}
interface OnCounterFinishedListener{
void firstCounterFinished();
void secondCounterFinished();
}
}
Then inside your main thread you can start this counter as
final Counter counter = new Counter(this);
counter.setTimes(5000, 5000);
counter.start(new Counter.OnCounterFinishedListener() {
#Override
public void firstCounterFinished() {
// Update your first TextView
}
#Override
public void secondCounterFinished() {
// Update your second TextView
}
});

How to get runOnUiThread to run continuously in Android

Using Android studio, I am trying to make an app that gets data from a web-service and display the data and updates the view every 5 sec or when the data on the web-service changes. With this I am trying to change the colours on some button based on an int, the int changes and the color on the button changes when I apply buttons(); to another button and then presses it but I want it to update by itself.
When I used a while loop the app gets stuck
MainActivity.this.runOnUiThread(new Runnable() {
#Override
public void run() {
buttons();
}
});
The runOnUiThread is placed in the onCreate.

using run on UI thread will cause your UI to freeze , try using a timer task instead .
example :
#Override
public void StopTimerTask() {
if (timer != null) {
timer.cancel();
timer = null;
}
}
public void StartTimer() {
timer = new Timer();
initializeTimerTask();
int UpdateTime = Integer.valueOf(UserSettings.getString("Update", "60000"));
timer.schedule(doAsynchronousTask, 0, YOURTIME);
}
public void initializeTimerTask() {
doAsynchronousTask = new TimerTask() {
#Override
public void run() {
myHandler.post(new Runnable() {
public void run() {
YOUR LOGIC HERE
}
});
}
};
}

doing this where u just put another class into main activity was succesful only problem is that it have to be in my main class
public class updategui extends TimerTask {
Activity context;
Timer timer;
public updategui(Activity context, int seconds) {
this.context = context;
timer = new Timer();
timer.schedule(this,
seconds * 1000, // initial delay
seconds * 1000); // subsequent rate
}
#Override
public void run() {
if(context == null || context.isFinishing()) {
this.cancel();
return;
}
context.runOnUiThread(new Runnable() {
#Override
public void run() {
try {
buttons();
} catch (Exception e) {
e.printStackTrace();
}
}
});
}}

How to create an infinite loop

Ok,I need to create an infinite loop on a countdown. My code is:
public void countdown() {
if (x != null) {
x.cancel();
}
x = new CountDownTimer(20000, 1000) {
public void onTick(long millisUntilFinished) {
}
public void onFinish() {
showNotification();
}
};
x.start();
}
x is just a static countdowntimer variable. The problem is that I tried many methods to make the above code work,I mean when the countdown ends,and it displays that notification,it should start again and so on....but I can't find a way to do it.

Hope this will help you.
public void countdown(){
if (x != null) {
x.cancel();
}
x = new CountDownTimer(20000, 1000) {
public void onTick(long millisUntilFinished) {
}
public void onFinish() {
showNotification();
x.start();
}
};
}

For the record CountDownTimer(long millisInFuture, long countDownInterval)
// A not so infinite but close to infinte interval for each second
CountDownTimer cdt=new CountDownTimer(Long.MAX_VALUE, 1000) { .... }
Where Long.MAX_VALUE = 9223372036854775807 miliseconds or around 292 million of years (seconds more or less)
Its not infinite but its incredibly long.

is to restart your timer when his has finished :)
like this :
x = new CountDownTimer(20000, 1000) {
public void onTick(long millisUntilFinished) {
}
public void onFinish() {
showNotification();
start();// here, when your CountDownTimer has finished , we start it again :)
}
};
x.start();

Simple way to create an infinite loop:
Every one secod call method
new CountDownTimer(1000, 1000)
{
public void onTick(long l) {}
public void onFinish()
{
//Code hear
start();
}
}.start();

Why not just use a regular Timer? It will repeat on a specified interval until you call cancel(), something like:
public void countdown() {
if (x != null) {
x.cancel();
}
x = new Timer("timerName");
x.schedule(_timerTask, 0, 20000);
}
private static final TimerTask _timerTask = new TimerTask() {
#Override
public void run() {
showNotification();
}
};

You can just use a while loop:
while (true) {
// do stuff
}
When it has done "the stuff" it wil start again, infinite!

to keep your timer working just put
<countdowntime>.start();
in the onfinish block

Well, I have implemented an indefinite timer that takes multiple listeners and calls them simultaneously on a specific interval.
import android.os.CountDownTimer;
import java.util.Arrays;
public class InfiniteCounter extends CountDownTimer {
private static final int MAX_LISTENERS = 100;
private static InfiniteCounter timer;
private static InfiniteCounterListener[] listenerList = new InfiniteCounterListener[MAX_LISTENERS];
private InfiniteCounter(long millisInFuture, long countDownInterval) {
super(millisInFuture, countDownInterval);
}
//Milliseconds Intervals in which the counter should call its listeners
public static InfiniteCounter initInstance(int intervalMillis) {
removeAllListeners();
if (timer == null) {
timer = new InfiniteCounter(60 * 60 * 1000, intervalMillis);
timer.start();
}
return timer;
}
public static void attachListener(InfiniteCounterListener listener) {
for (int i = 0; i < MAX_LISTENERS; i++) {
if (listenerList[i] == null) {
listenerList[i] = listener;
break;
}
}
}
public static void removeListener(InfiniteCounterListener listener) {
for (int i = 0; i < MAX_LISTENERS; i++) {
if (listenerList[i] == listener) {
listenerList[i] = null;
break;
}
}
}
private static void removeAllListeners() {
Arrays.fill(listenerList, null);
}
public static void stopTimer() {
removeAllListeners();
if (timer != null) timer.cancel();
timer = null;
}
#Override
public void onTick(long l) {
for (int i = 0; i < MAX_LISTENERS; i++) {
if (listenerList[i] != null) listenerList[i].onTick();
}
}
#Override
public void onFinish() {
timer.start();
}
public interface InfiniteCounterListener {
void onTick();
}
}
Just Attach listeners to this class and with single timer, it can call multiple listeners -- which makes is very performance optimised.