Develop Reference

The Timer does not accelerate when it runs for the first time, but the timer accelerates at the next working moments. How can i fix it?

public void startCountdownTimer() {
currentCountdown = startCountdown;
// stopTimer=false;
if (stopTimer == true) {
return;
}
for (int i = 1; i <= startCountdown + 1; i++) {
task = new TimerTask() {
#Override
public void run() {
countdownHandler.post(doA);
}
};
countdownTimer = new Timer();
countdownTimer.schedule(task, i * 1000);
}
}
final Runnable doA = new Runnable() {
#Override
public void run() {
//reset timer when switching to another question
if (currentCountdown != -1 && btn_next.getText().equals("CHECK") && stopTimer != true) {
if (currentCountdown == 0) {
relative_stop.setVisibility(View.INVISIBLE);
currentCountdown = startCountdown;
btn_next.setText("NEXT");
toast = Toasty.warning(getApplicationContext(), "Time's UP", 1000);
toast.show();
toast = Toasty.info(getApplicationContext(), correctAnswer, 1000);
toast.show();
countdownTimer.cancel();
countdownTimer.purge();
}
tv_timer.setText("" + currentCountdown);
currentCountdown--;
}
}
};
I'm trying to make a timer that counts down for 10 seconds, it works normally when it runs for the first time, and when it runs consecutively, the timer caused by delay suddenly speeds up.

a good way to check if timer already run repeatedly

I'm working on React Native and i want to create a never ending service that run every (n) seconds on Native Modules (on this topic is android).
I've create a simple service like this
public void startTimer() {
timer = new Timer();
timer.scheduleAtFixedRate(new TimerTask() {
public void run() {
Log.v(TAG, "SERVICE RUN");
try{
if(haveNetworkConnection()){
db.openDB();
if(db.countRowNewStructure()>0){
//send data to server
} else{
Log.v(TAG, "No data should be send to server");
}
} else {
Log.v(TAG, "Ga ada sinyal");
}
} catch (JSONException e){
e.printStackTrace();
}
}
}, 0, 1000);
}
above code run every second to check, but i'm facing the problem when i re-run the service from React Native, the log showing me those code every 0.5 seconds
the simulation may be like :
0----------------1 //seconds
startTimer()
re-run startTimer() conscious
0----------------1 //seconds
startTimer()
//now i have two startTimer() that will run every 1 sec on different interval
I want to keep my startTimer() just running once even I trigger startService() every 0.5 sec.
how can i do that? is it possible?

this may help you. Timmer to perform the certain action in android after the particular time.
final Handler handler = new Handler();
Timer timer = new Timer();
TimerTask timertaskforsynctime = new TimerTask() {
#Override
public void run() {
handler.post(new Runnable() {
#Override
public void run() {
// your action here
}
});
}
};
timer.schedule(timertaskforsynctime,5000,10000);// decide the time when it will start and after how much time it will run continusly.
}`
for one time
new Handler().postDelayed(new Runnable(){
#Override
public void run() {
// your code that will run after 1 sec
}
}, 1000);

You could make use of the cancel method to cancel the previous Timer.
public class YourModule extends ReactContextBaseJavaModule {
Timer tim = new Timer();
public void startTimer() {
tim.cancel();
tim = new Timer();
tim.scheduleAtFixedRate(
new TimerTask() {
public void run() {
// Run tasks
}
},
0,
1000);
}
}

Timer Task Execute wrong time delay

My app started automatic when device is Restart or Manually turnoff.
in this app i am changing imageView image after every 25 second and its working fine.
But when i restart mobile device and app start automatic
then some image wait for 25 second but some images change after 1 or 2 second.
Please Help
Here is code--->
i = 0;
Timer slideTimer = new Timer();
slideTimer.scheduleAtFixedRate(new TimerTask() {
#Override
public void run() {
runOnUiThread(new Runnable() {
#Override
public void run() {
if (i >= imageBitmapList.size()){
i = 0;// resert value
}
try {
img_vw2.setImageBitmap(imageBitmapList.get(i));
}catch (Exception e){
}
i++;
}
});
}
}, 0, 25000);

Timer that run every seconds on android eclipse

Hi every one can you help to create a 5 seconds timer that runs for every 3 or 5 seconds.. im new in android pls help me
i have only created a 5 seconds timer but it only run once.. i want it to run for every 5 seconds..
and here is my code :
txt1 = (TextView)findViewById(R.id.textView1);
final Handler handler = new Handler();
TimerTask task = new TimerTask() {
#Override
public void run() {
handler.post(new Runnable() {
public void run() {
// pos=rand.nextInt(10);
//txt1.setText(""+pos);
if(Integer.parseInt(txt1.getText().toString()) != 0)
{
txt1.setText("" + (Integer.parseInt(txt1.getText().toString()) - 1));
}
}
});
}
};
Timer timer = new Timer();
timer.schedule(task, 1000, 1000);
Thx :)

You can do it using below code, handler calls itself again and again.
final Handler handler = new Handler();
Runnable runable = new Runnable() {
#Override
public void run() {
try{
if(Integer.parseInt(txt1.getText().toString()) != 0)
{
txt1.setText("" + (Integer.parseInt(txt1.getText().toString()) - 1));
}
handler.postDelayed(this, 3000);
}
catch (Exception e) {
// handle exception
}
}
};
handler.postDelayed(runable, 5000);

Why does my app crash after hitting Reset

The timer works fine for starting then reseting and leaving the view, but if I start the time then leave the view and return and just hit Reset the app crashes. I know that most people would not hit reset when the timer is not started, but for idiot proofing I need a fix for this any suggestions?
public void startTimer(View view) {
final Handler handler = new Handler();
Timer ourtimer = new Timer();
timerTask = new TimerTask() {
public void run() {
handler.post(new Runnable() {
public void run() {
int sec = n % 60;
int min = n / 60;
TextView timer = (TextView) findViewById(R.id.androidtimer);
timer.setText("" + String.format("%02d", min) + ":"
+ String.format("%02d", sec));
// timer.setText(n + " Seconds");
n++;
}
});
}
};
ourtimer.schedule(timerTask, 0, 1000);
}
public void stopTimer(View view) {
timerTask.cancel();
TextView timer = (TextView) findViewById(R.id.androidtimer);
timer.setText("--:--");
timerTask = null;
n = 0;
}

I think your problem is that timerTask is null as long as you do not start the timer.
So a simple if clause might help. If that's not the problem please post the exception.
public void stopTimer(View view) {
if(timerTask != null) {
timerTask.cancel();
}
TextView timer = (TextView) findViewById(R.id.androidtimer);
timer.setText("--:--");
timerTask = null;
n = 0;
}