I am working on quiz type application and I want to calculate the time between some activities. for example, my level starts from activity A and ends at activity H. I want to calculate the time taken by all the activities. Can anyone please help me to count the time taken from the first activity to the ending activity?
Declare the variables
//counter of time since app started, a background task
private long mStartTime = 0L;
private TextView mTimeLabel;
//handler to handle the message to the timer task
private Handler mHandler = new Handler();
Start the timer in onCreate or onStart or your own method (click of button)
if(mStartTime==0L){
mStartTime=SystemClock.uptimeMillis();
mHandler.removeCallbacks(mUpdateTimeTask);
mHandler.postDelayed(mUpdateTimeTask,100);
}
timer function
private Runnable mUpdateTimeTask = new Runnable() {
public void run() {
final long start = mStartTime;
long millis = SystemClock.uptimeMillis() - start;
int seconds = (int) (millis / 1000);
int minutes = seconds / 60;
seconds = seconds % 60;
mTimeLabel.setText("" + minutes + ":"
+ String.format("%02d", seconds));
mHandler.postDelayed(this, 200);
}
};
when the app is minimized, pause the timer
#Override
protected void onPause() {
mHandler.removeCallbacks(mUpdateTimeTask);
super.onPause();
}
when the app is resumed, resume the timer
#Override
protected void onResume() {
super.onResume();
mHandler.postDelayed(mUpdateTimeTask, 100);
}
Related
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.
How can I keep the value of my timer resuming after going to another activity , my problem is that it's set to default if I switched to another activity I thought of using sharedpreference but it won't help because I need it to keep decrementing in the background.
public void reset()
{
countDownTimer.cancel();
}
private void setTimer() {
int time = 5;
if(countDownTimer==null)
{
totalTimeCountInMilliseconds = 60 * time * 1000;
}
else
{
reset();
totalTimeCountInMilliseconds = 60 * time * 1000;
}
}
private void startTimer() {
countDownTimer = new CountDownTimer(totalTimeCountInMilliseconds, 500) {
// 500 means, onTick function will be called at every 500
// milliseconds
//#Override
public void onTick(long leftTimeInMilliseconds) {
seconds = leftTimeInMilliseconds / 1000;
textViewShowTime.setText(String.format("%02d", seconds / 60)
+ ":" + String.format("%02d", seconds % 60));
// format the textview to show the easily readable format
}
#Override
public void onFinish() {
// this function will be called when the timecount is finished
textViewShowTime.setText("Time up!");
textViewShowTime.setVisibility(View.VISIBLE);
}
}.start();
}
You should stop your CountDownTimer in onPause and restart in onResume, your textViewShowTime might not be valid while your activity is in background.
If you need to call some code every 500ms no matter what activity you are in, then consider using AlarmManager.
I have a timer in android to countdown to a future date, but it is not refreshing. Any help appreciated. my code is posted below:
public class Activity1 extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
TextView t = (TextView)findViewById(R.id.countdown);
t.setText(timeDif());
I believe that t.setText just needs to be constantly updated, but am unsure of how to do that.
}
public String timeDif()
{
GregorianCalendar then = new GregorianCalendar(2012, 07, 21, 6, 0, 0);
Calendar now = Calendar.getInstance();
long arriveMilli = then.getTimeInMillis();
long nowMilli = now.getTimeInMillis();
long diff = arriveMilli - nowMilli;
int seconds = (int) (diff / 1000);
int minutes = seconds / 60;
seconds %= 60;
int hours = minutes / 60;
minutes %= 60;
int days = hours / 24;
hours %= 24;
String time = days + ":" +zero(hours)+":"+zero(minutes)+":"+zero(seconds);
return time;
}
private int zero(int hours) {
// TODO Auto-generated method stub
return 0;
}
}
The textbox wont update unless you do it in its own thread. The Timer runs on a different thread than the UI. Here is how I did it.
myTimer = new Timer();
myTimerTask = new TimerTask() {
#Override
public void run() {
TimerMethod();
}
};
myTimer.schedule(myTimerTask, 0, 100);
private void TimerMethod()
{
//This method is called directly by the timer
//and runs in the same thread as the timer.
//We call the method that will work with the UI
//through the runOnUiThread method.
if (isPaused != true) {
this.tmrMilliSeconds--;
this.runOnUiThread(Timer_Tick);
}
}
private Runnable Timer_Tick = new Runnable() {
public void run() {
//This method runs in the same thread as the UI.
if (tmrSeconds > 0) {
if (tmrMilliSeconds <= 0) {
tmrSeconds--;
tmrMilliSeconds = 9;
}
} else {
Vibrator v = (Vibrator)getSystemService(Context.VIBRATOR_SERVICE);
v.vibrate(1000);
myTimer.cancel();
tmrSeconds = setTime;
tmrMilliSeconds = 0;
isPaused = true;
}
//Do something to the UI thread here
timerText.setText(String.format("%03d.%d", tmrSeconds, tmrMilliSeconds));
}
};
That is part of the code for a count down clock I made for an ap. It demonstrates how to have one thread run (The public void run()) part, and then another part that runs on the UI thread. Hope that helps.
You shouldn't be doing this with a timer. A timer uses a thread and you don't need one (and it complicates things unnecessarily). You need to use a Runable and Handler's postDelayed method to do it. It is easier and lighter weight.
Handler mHandler = new Handler();
private Runnable mUpdateTimeTask = new Runnable() {
public void run() {
//update here
mHandler.postDelayed(mUpdateTimeTask, 100);
}
};
private void startTimer()
{
mHandler.removeCallbacks(mUpdateTimeTask);
mHandler.postDelayed(mUpdateTimeTask, 100);
}
Hi I'm working on one of my project then I encountered this problem, well I don't know if it is a bug or something I just want to share hoping to get some answer to enlighten my day. So here's the problem:
I made a countdown timer for my project which will run for 2 minutes (that will be 120 seconds) 1000 is the interval time (1000ms = 1s) then I set a checker, an integer of 120 (declared globally) which will be diminished by one each time the timer ticks. The integer will be shown on a textView counting down. then will show a message when the integer reaches the onFinish of the timer. That message will give how much time I've spent by deducting the declared integer by 120.
The problem here is that the timer stops before it reaches 1 given that it will not be deducted by the last tick. The hardest part is that sometimes it stops with 4 or even 5 on the remaining time. Can Anyone help me about this one? Thanks in advance!
Here's my code for further understanding:
//declared a timer
int timer = 120;
//starts the timer
gameTimer = new gameTimer(120000, 1000);
gameTimer.start();
private class gameTimer extends CountDownTimer{
public gameTimer(long startTime, long interval)
{
super(startTime, interval);
}
public void onTick(long millisUntilFinished)
{
//on tick deduct timer by 1
timer -= 1;
TextView timer1 = (TextView)findViewById(R.id.textView1);
timer1.setText(""+timer);
}
public void onFinish()
{
//PERFORM END ACTION UPON FINISHING THE GAME
endtime = 120 - timer;
TextView endtime1 = (TextView)findViewById(R.id.textView2);
1.setText(""+endtime);
}
}
First *: this is your class that extended the* CountDownTimer :
public class GameTimer extends CountDownTimer{
private YourActivity context;
private int timer = 120;
private int endtime;
private TextView timer1,endTime1;
public gameTimer(YourActivity context, long startTime, long interval)
{
// passing the context of your activity
this.context = context;
//get the textView to display results
timer1 = (TextView)this.context.findViewById(R.id.textView1);
endTime1 = (TextView)this.context.findViewById(R.id.textView2);
super(startTime, interval);
}
public void onTick(long millisUntilFinished)
{
//on tick deduct timer by 1
timer -= 1;
//override the method runOnUIThread
context.runOnUiThread(new Runnable(){
#override
public void run(){
timer1.setText(""+timer);
}
});
}
public void onFinish()
{
//PERFORM END ACTION UPON FINISHING THE GAME
endtime = 120 - timer;
//override the method runOnUIThread
context.runOnUiThread(new Runnable(){
#override
public void run(){
endTime1.setText(""+endtime);
}
});
}
}
Second : in your activity ( on the method onCreate() , instanciate your GameTimer and start it :
//instanciate the GameTimer and pass the context to it
GameTimer gameTimer = new GameTimer(this, 120000, 1000);
gameTimer.start();